WO2005033041A1 - アルミナ質磁器組成物およびそれを用いたスパークプラグ - Google Patents
アルミナ質磁器組成物およびそれを用いたスパークプラグ Download PDFInfo
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- WO2005033041A1 WO2005033041A1 PCT/JP2004/014880 JP2004014880W WO2005033041A1 WO 2005033041 A1 WO2005033041 A1 WO 2005033041A1 JP 2004014880 W JP2004014880 W JP 2004014880W WO 2005033041 A1 WO2005033041 A1 WO 2005033041A1
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- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
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- C04B35/10—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on aluminium oxide
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
- H01T13/00—Sparking plugs
- H01T13/20—Sparking plugs characterised by features of the electrodes or insulation
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Definitions
- the present invention relates to an alumina-based porcelain composition which is a sintered body containing alumina as a main component, and a spark plug using the alumina-based porcelain composition as an insulator.
- the alumina-based porcelain composition has a high insulating property and a high withstand voltage.
- such an alumina-based porcelain composition includes alumina
- a SiO 2 _MgO—CaO-based alumina sintered body containing (A 12 O 3 ) as a main component is known (see, for example, Japanese Patent No. 25644842). ).
- This material is extremely stable thermally and chemically, has excellent mechanical strength, and has been widely used as an electrical insulating material such as a spark plug of an internal combustion engine. Disclosure of the invention
- the spark plug itself for igniting the air-fuel mixture also needs to be reduced in size (smaller diameter), and accordingly, the spark plug has an insulator that is interposed between the center electrode and the mounting bracket. The thickness also tends to decrease.
- the temperature inside the combustion chamber tends to increase due to a supercharging device such as a turret charger, and the alumina-based porcelain composition used as an insulating material of the spark plug has a disadvantage. Further heat resistance is required. Therefore, there is a need for spark plugs with insulating materials having even higher withstand voltage characteristics.
- the present invention has been made in view of the above circumstances, and provides a novel alumina-based porcelain composition having more excellent withstand voltage characteristics, and a spark plug using such an alumina-based porcelain composition.
- the purpose is to:
- the present inventors have conducted intensive studies. Since the A 1 2 0 3 as the main component of the alumina electrolyte ceramic composition is extremely high melting point (about 2 0 5- 0 ° C), the withstand voltage characteristics toward - in order to above is is, ... A 1 It is effective to increase the content of 2 O 3 .
- a M g O and C a sintering aid such as O Ru bovine form eutectic Ri by the reaction such as low-melting liquid phase between A 1 2 O 3 during sintering
- a sintering aid such as O Ru bovine form eutectic Ri by the reaction such as low-melting liquid phase between A 1 2 O 3 during sintering
- the sintered body can be densified even at a relatively low firing temperature, but the liquid phase with a low melting point becomes a glass phase after sintering. And This glass phase has a low withstand voltage.
- the present inventors conducted experimental studies on additives to be added to alumina as a main component in the alumina-based porcelain composition.
- an alumina-based porcelain made of a composite sintered body of alumina as a main component and a composition of at least one element selected from A 1, Si, Mg, and a rare earth element It was found that the composition provided improved withstand voltage characteristics.
- an alumina-based porcelain composition comprising a composite sintered body of alumina as the main component and a composition of at least one element selected from Al, Si, Mg, and a rare earth element is described below.
- An experimental study was conducted on specific materials and compositions to optimize them. The present invention has been experimentally created based on the results of such studies.
- the present invention relates to, in a first aspect, an alumina-based porcelain composition containing alumina as a main component, wherein the main component is alumina and at least one selected from the group consisting of A 1, Si, Mg, and a rare earth element.
- the alumina as the main component is 100 parts by weight, it is composed of a composite sintered body with a composition of the seed elements, and when the alumina is 100 parts by weight, at least one selected from the group consisting of A 1, S i, Mg, and a rare earth element is used.
- Also Allumina porcelain composition characterized in that the composition of one element is not more than 5 parts by weight.
- a composition having a high withstand voltage characteristic is provided by the composition of at least one element selected from A 1, Si, Mg, and a rare earth element at the grain boundaries between the alumina particles.
- An object is formed. This will be described in more detail.
- X-ray diffraction was performed on the alumina-based porcelain composition of the present invention.
- the main component, alumina, and the composition of at least one element selected from Al, Si, Mg, and rare earth elements all showed a crystalline phase.
- the alumina-based porcelain composition of the present invention has excellent withstand voltage characteristics because the composition of at least one element selected from the above-mentioned A1, Si, Mg and rare-earth elements is used for sintering alumina. It is considered that this promotes the formation of the composition and, in particular, enhances the fluidity of the composition during sintering.
- the alumina-based porcelain composition of the present invention has almost no pores as compared with the conventional one.
- the composition of at least one element selected from the above Al, Si, Mg, and the rare earth element was-, It has been found that a high melting point oxide phase having a high melting point is formed at the grain boundaries of the alumina. It was found that this high melting point oxide phase was formed so as to surround the main component alumina.
- This high-melting-point oxide phase generally has higher insulating properties than the conventional glass phase composed of a sintering aid, and does not easily become a conductive path at the time of dielectric breakdown even when a high voltage is applied. Therefore, in the alumina-based porcelain composition of the present invention, it is considered that the breakdown voltage is improved by dividing the conductive path.
- the additives A 1, S i, Mg and A composition having at least one element selected from the group consisting of a rare earth element and a rare earth element promotes sintering of alumina to minimize the generation of vacancies and has high withstand voltage characteristics. Therefore, it is considered that better withstand voltage characteristics can be realized in practice because they are appropriately formed at the grain boundaries between alumina particles.
- the rare earth element is La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy , Ho, Er, Tm, Yb, Lu, and Y are at least one element selected from the group of elements.
- the Hare in alumina ceramic composition of the present invention, the composition of the rare earth element, L a 2 O 3, C e 0 2, C e 2 0 3, P r 2 O 3, P r 6 O: x , N d 2 0 3, S m 2 O 3, E u O a G d 2 O 3, T b 2 O 3, T b 4 O 7, D y 2 O 3, H and characterized in that it is a o 2 O 3, E r 2 O 3, Tm 2 O 3, Y b 2 0 3, L u 2 O 3 and Y 2 0 3 at least one or more compositions selected from are doing.
- the alumina ceramic composition in the alumina-based porcelain composition of the present invention, by forming the rare earth element and the rare earth element into a composition like this, the alumina ceramic composition can more preferably be formed at the grain boundary of alumina.
- a composition having high withstand voltage characteristics is formed so as to surround the main component alumina.
- the present invention relates to an alumina porcelain composition containing alumina as a main component, wherein the main component is alumina and at least one element selected from A 1 and Y.
- the main component is alumina and at least one element selected from A 1 and Y.
- the alumina as the main component is 100 parts by weight, at least one composition selected from A1 and Y is not more than 5 parts by weight.
- An alumina-based porcelain composition characterized in that: According to the present invention, a new alumina porcelain having more excellent withstand voltage characteristics A composition can be provided.
- a composition having high withstand voltage characteristics is formed by a composition of at least one element selected from A 1 and Y.
- the action of the composition of at least one element selected from A 1 and Y is the same as that of A 1, S i, M
- the effect is the same as that of the composition of at least one element selected from the group consisting of g and the rare earth elements. .
- the composition of at least one element selected from the additives A 1 and Y promotes sintering of alumina to minimize the generation of vacancies and achieve high resistance to alumina. Since the composition having the voltage characteristics is appropriately formed at the grain boundaries between the alumina particles as the main component, it is considered that in practice, more excellent withstand voltage characteristics can be realized.
- the composition of at least one element selected from A 1 and Y is represented by A 1-2 S-IO 5 Mg A 1 2 O 4, A 1 2 O 3 ⁇ T i - 0- 2 -,
- the composition of at least one element selected from A 1 and Y is made such that the alumina particles are more preferably used.
- a composition having high withstand voltage characteristics is formed so as to surround the main component alumina.
- the present invention provides a method comprising the steps of: A alumina electrolyte ceramic composition, composite sintered in alumina is the main component, a rare-earth element R composite oxide in which Bae Robusukai preparative oxide of e and A 1 R e A 1 0 3 Wherein the perovskite-type oxide R e A 1 O 3 is 5 parts by weight or less when the alumina as the main component is 100 parts by weight. In the thing.
- the action of the perovskite oxide R e Al O 3 is caused by the effects of A 1, S i, Mg and the rare earth element described in the first aspect of the present invention.
- the effect is the same as that of the composition of at least one element selected from the above, and this is also experimentally confirmed as in the case of the alumina-based porcelain composition of the present invention.
- the present invention provides a alumina ceramic composition, the composite sintered body, alumina which is the main component, in addition to said pair Robusukai preparative oxide R e A 1 O 3 And a composition of at least one element selected from the group consisting of A 1 and Y forces, wherein the alumina as the main component is 100 parts by weight, and the perovskite type An oxide R e A 1 O 3, in ⁇ alumina electrolyte ceramic composition, wherein the total of the composition of one element at least selected from A 1 and Y is less than 5 parts by weight.
- the present invention is substantially a combination of the invention described as the third aspect and the invention described as the second aspect.
- composition of at least one element selected from Perot Pusukai preparative oxide R e A 1 0 3 and A 1 and Y is, for exhibiting the effect of added pressure prepared by the Thus, better withstand voltage characteristics can be realized.
- the alumina-based porcelain composition according to the present invention is characterized in that the composition of at least one element selected from A 1 and Y is Al 2 Si 0 5 , Mg Al 2 O 4, A l 2 0 3 ' T i 0 2, 3 A l 2 O 3' 2 S i O 2, YA 1 0 3, Y 3 A 1 5 0 12, Y 2 S i O 5 and A 1 It is characterized in that it is at least one or more compositions selected from 2 O 3 .
- the composition of at least one element selected from A 1 and Y is more preferably made as described above. In addition, it has high withstand voltage characteristics at the grain boundaries of alumina.
- the composition is formed in a form surrounding the alumina as the main component.
- ⁇ alumina electrolyte ceramic composition according to the invention, said base Robusukai preparative oxide R e A 1 O 3, L a A 1 0 3, C e A l O 3, P r A 1 0 3, N d A 1 0 3, S mA 1 0 3, E u A l OG d A l O 3, T b A 1 0 3, D y A 1 O 3, H is o a 1 0 3, E r a l ⁇ 3, TmA l O 3, Y b a 1 0 3, L u a 1 0 3 and YA 1 O 3 at least 1 or more compositions selected from It is characterized by:
- the alumina-based porcelain composition of the present invention there are, Ri by a pair Robusukai preparative oxide R e A 1 0 3 to be Rukoto something like this, yo Ri preferably at the grain boundaries of the alumina, the main component is a composition having a high withstand voltage characteristic Is formed so as to surround the alumina.
- the alumina-based porcelain composition according to the present invention is characterized in that the composite sintered body has an average particle diameter of 1.0 / zm or less.
- the alumina-based porcelain composition can increase the firing shrinkage with almost no voids. Therefore, densification as an insulator can be realized. As a result, it exhibits excellent withstand voltage characteristics because there are no vacancies that can be the starting point of dielectric breakdown when a high voltage is applied.
- the present invention resides in a spark plug using the alumina-based porcelain composition of the present invention described above and described in detail below as an insulating material.
- a spark plug using a novel alumina-based porcelain composition having more excellent withstand voltage characteristics can be provided. That is, a spark plug exhibiting excellent withstand voltage characteristics is provided.
- the present invention provides a mounting bracket (10) provided with a mounting screw (12) on an outer periphery thereof, and an insulator fixed in the mounting bracket (10). (20), a center electrode (30) fixed in the insulator (20) so that a tip portion (31) protrudes from the insulator (20), and the mounting bracket (30).
- the spark plug includes a ground electrode (40) fixed to the center electrode (30) and opposed to the tip (31) of the center electrode (30) via a spark discharge gap (50).
- the insulator (20) one made of the alumina-based porcelain composition of the present invention described above and described in detail below is used. The nominal diameter is less than M10. It is in the spark plug.
- a spark plug uses a new alumina-based porcelain composition with better withstand voltage characteristics and that has a smaller mounting thread (12) with a nominal diameter of M10 or less. can do.
- FIG. 1 is a half sectional view showing the entire configuration of a spark plug according to an embodiment of the present invention.
- the spark plug S 1 shown in FIG. 1 is applied to a spark plug or the like of an automobile engine, and is provided with a screw provided on an engine head (not shown) which defines a combustion chamber of the engine. It is inserted into the hole and fixed.
- the spark plug S 1 has a cylindrical mounting bracket 10 made of a conductive steel material (for example, low carbon steel or the like). An outer surface of the mounting bracket 10 is provided with an engine blower (not shown). A mounting screw portion 12 for fixing the bracket to the rack is provided.
- the nominal diameter of the mounting screw portion 12 is 10 mm or less. That is, the mounting screw portion 12 in the present embodiment is M10 or less in JIS (Japanese Industrial Standard).
- insulating insulator made of alumina-based porcelain composition.
- the insulator 20 is housed and fixed, and the tip 21 of the insulator 20 projects from the tip 11 of the mounting bracket 10.
- the center electrode 30 is fixed to the shaft hole 22 of the insulator 20, whereby the center electrode 30 is insulated from the mounting bracket 10.
- the center electrode 30 is, for example, a cylinder whose inner material is made of a metal material having excellent thermal conductivity such as Cu, and whose outer material is formed of a metal material having excellent heat resistance and corrosion resistance such as a Ni-based alloy. Consists of a body.
- the center electrode 30 is provided such that its tip 31 protrudes from the tip 21 of the insulator 20.
- the center electrode 30 is housed in the mounting bracket 10 with its tip 31 protruding.
- the ground electrode 40 is, for example, in the form of a column made of a Ni base alloy having Ni as a main component.
- the ground electrode 40 has a prismatic shape, one end of which is fixed to the distal end 11 of the mounting bracket 10 by welding or the like, and the middle portion is bent into a substantially L-shape, and the other end is Of the center electrode 30 on the side surface 42 thereof with a spark discharge gap .50 therebetween.
- a noble metal tip 35 is provided at the tip 31 of the center electrode 30 so as to protrude from the tip 31.
- a noble metal tip 45 is provided on the side surface 42 of the ground electrode 40 so as to protrude from the side surface 42.
- These noble metal tips 35, 45 are made of Ir (iridium) alloy, Pt (platinum) alloy, or the like, and are applied to the electrode base materials 30, 40 by laser welding or resistance welding. It has been joined.
- the spark discharge gap 50 is a gap between the end surfaces of both the noble metal tips 35 and 45.
- the size of this spark discharge gap 50 is limited although not specified, it can be, for example, about 1 mm.
- a stem 60 for taking out the center electrode 30 is provided in a shaft hole 22 of the insulating insulator 20 at a portion opposite to the tip end portion 21 of the insulator 20.
- the stem 60 is a rod having conductivity, and is electrically connected to the center electrode 30 via a conductive glass seal 70 inside the shaft hole 22 of the insulator 20. I have.
- the insulator 20 is made of an alumina-based porcelain composition containing alumina as a main component.
- the alumina-based porcelain composition of the insulator 20 is used. We use our own. Next, the alumina-based porcelain composition of the present embodiment will be described.
- the alumina-based porcelain composition of the present embodiment comprises alumina as a main component and at least one element selected from A1 (aluminum), Si (silicon), Mg (magnesium), and a rare earth element. It consists of a composite sintered body with the composition. Hereinafter, this is referred to as the “first alumina-based porcelain composition”.
- the composition of at least one element selected from the group consisting of A 1,. S i., Mg and a rare earth element means the composition of A 1, the composition of S i, the composition of M g It may be a composition, a composition of a rare earth element, or a mixture of elements selected from A 1, S i, Mg, and a rare earth element in one composition.
- the rare earth element belongs to Group 3 of the periodic table of the element, and is a lanthanide with Sc (scandium), Y (yttrium), and atomic numbers 57 to 71.
- rare earth elements preferably used in the first alumina-based porcelain composition include La (lanthanum), Ce (cerium), and Pr (Praseodymium), Nd (Neodymium), Sm (Samarium), Eu (Eupium Pium), Gd (Gadolinium), Tb (Terbium), Dy (dysprosium), Ho (holmium), At least one element selected from the elements of Er (erbium), Tm (thulium), Yb (ytterbium), Lu (lutetium), and Y.
- the composition of at least one element selected from Al, Si, Mg, and rare earth elements is less than 5 parts by weight. That is, the weight ratio of the composition of at least one element selected from A 1, S i, Mg, and the rare earth element to alumina as the main component is 5 to 100 or less.
- the alumina-based porcelain composition of the present embodiment includes a composite sintered body of alumina as a main component and a composition of at least one element selected from A 1 and Y.
- alumina as a component is 100 parts by weight
- a composition in which the composition of at least one element selected from A 1 and Y is 5 parts by weight or less can also be used.
- this is referred to as “second alumina-based porcelain composition”.
- the composition of at least one element selected from A 1 and Y refers to a composition containing A 1, a composition containing Y, or a composition containing both A 1 and Y That is.
- a l 2 S i ⁇ have M g A l 2 0 4, from A l 2 0 3 'T i 0 2, 3 ⁇ 1 2 ⁇ 3 ⁇ 2 S i 0 2, ⁇ 1 ⁇ 3, Y 3 A l 5 O 12, Y 2 S i O 5 and A 1 2 0 3
- At least one or more compositions of choice can be employed.
- the alumina-based porcelain composition of the present embodiment includes a perovskite oxide, which is a composite oxide of alumina as a main component and a rare earth element R e and A 1, where R e is a rare earth element. made from the composite sintered body with R e a 1 O 3, when the alumina as the main component and 1 0 0 part by weight, Bae Robusukai preparative oxide R e a 1 0 3 is der than 5 parts by weight Something can be adopted. Hereinafter, this is referred to as “third alumina-based porcelain composition”.
- Et al is, as the alumina ceramic composition of the present embodiment, alumina as the main component, and Bae Robusukai preparative oxide R e A 1 0 3, at least selected from A 1 Contact and Y 1 or of It is composed of a composite sintered body with the elemental composition.
- the main component alumina is 100 parts by weight, the perovskite oxide R e A 1 O 3 and a small amount selected from A 1 and Y It is also possible to employ those having a total of at least 5 parts by weight with the composition of at least one element.
- this is referred to as “the fourth alumina-based porcelain composition”. It is decided.
- a composition of at least one element selected from A 1, S i, Mg and a rare earth element, and at least one element selected from A 1 and Y are additives added to the main component of alumina in the composite sintered body constituting the alumina-based porcelain composition. is there.
- additive compositions these additives will be referred to as “additive compositions”.
- the additive composition in the composite sintered body, is not more than 5 parts by weight based on 100 parts by weight of alumina as a main component. Specifically, the additive composition can be added at about 0.5 to 5 parts by weight.
- a novel alumina-based porcelain composition having more excellent withstand voltage characteristics can be provided.
- the above additive composition has high withstand voltage characteristics at the grain boundary between alumina particles as a main component. That the composition is formed. I will tell you about this in more detail. -— Actually, when X-ray diffraction was performed on each of the first to fourth alumina-based porcelain compositions, the main component, alumina, and the additive composition each showed a crystalline phase. I was
- the first to fourth alumina-based porcelain compositions have excellent withstand voltage characteristics because the additive composition promotes sintering of alumina, and in particular, the fluidity of the additive composition during sintering. It is thought that it can be further enhanced.
- the present inventors have confirmed by microscopic observation and the like that the first to fourth alumina-based porcelain compositions have almost no vacancies as compared with the conventional one.
- each of the first to fourth alumina-based porcelain compositions revealed that the additive composition formed a high-melting-point oxide phase at the grain boundaries of alumina. . Then, it was found that this high melting point oxide phase was formed so as to surround the main component alumina.
- This high-melting-point oxide phase generally has higher insulating properties than the conventional glass phase composed of a sintering aid, and does not easily become a conductive path at the time of dielectric breakdown even when a high voltage is applied. Therefore, it is considered that the first to fourth alumina-based porcelain compositions improve the withstand voltage of the insulation blast by dividing the conductive path.
- the additive composition promotes sintering of alumina to prevent generation of vacancies as much as possible, while maintaining high withstand voltage. Since the composition having the characteristics is appropriately formed at the grain boundaries between the alumina particles, which are the main components, it is considered that a higher withstand voltage characteristic can actually be realized.
- the average particle diameter of the composite sintered body is 1. ⁇ or less.
- the alumina-based porcelain composition increases firing shrinkage with almost no voids.
- densification as an insulator can be realized.
- when high voltage is applied It shows excellent withstand voltage characteristics because there are no vacancies.
- the used spark plug S1 is provided.
- a spark plug S 1 using a novel alumina-based ceramic composition having more excellent withstand voltage characteristics. That is, a spark plug S1 exhibiting excellent withstand voltage characteristics is provided.
- the mounting bracket 10 provided with the mounting screw portion 12 on the outer periphery, the insulator 20 fixed inside the mounting bracket 10, and the tip 31 are formed of the insulator 20.
- a spark discharge gap 50 is provided between the center electrode 30 fixed inside the insulator 20 so as to protrude from the insulator 20 and the front end 31 of the center electrode 30 fixed to the mounting bracket 10.
- a ground electrode 40 opposed to the spark plug the insulator 20 is made of any one of the above-described first to fourth alumina-based porcelain compositions.
- a spark plug S 1 which has a new alumina ceramic composition having better withstand voltage characteristics, and has a smaller mounting thread 12 having a nominal diameter of M10 or less. Can be provided.
- Table 1 shows Examples 1 to 1.
- Table 9 shows Examples 20 to 38
- Table 3 is for Examples 39 to 44
- Table 4 is for Examples 45 to 56.
- FIG. 3 is a table showing the formulation composition (unit: parts by weight), firing density (unit: g / cm 3 ), and withstand voltage (unit: kVZmm) of the alumina-based porcelain composition.
- CaCO 3 becomes CaO after sintering, and is expressed in parts by weight converted to CaO. Further, S i 0 2, C a C 0 3, M g O , respectively 0.8 6 parts by weight, 0.0 4 parts by weight, 0.1 0 part by weight, the embodiments of this ratio is less This is the same in the comparative example.
- the above mixed raw material is mixed with pure water by means of a milling means such as a ball mill for 24 hours, and then the mixed raw material is dried, granulated and pressed to form a spark plug insulator.
- the shape has been adjusted.
- the baking density is 3.95 g / cm 3 (relative density 98.5%).
- a spark plug insulator made of an alumina porcelain composition was manufactured.
- the firing density is almost the same as the firing density of the insulator in the conventional spark plug (see a comparative example described later), and the density is increased.
- the center electrode is inserted into this insulator, and then the conductive glass sealant is filled by pressurization. After heating for 30 minutes to soften the conductive glass sealant, the stem was immediately pressurized. After cooling, a spark plug was obtained by attaching a housing with a ground electrode fixed to the outer periphery.
- alumina 1 0 0 parts by weight and the sintering aid (S io 2, C a O , M g O): additive composition with a total of one part by weight Y 2 0 3:. 0 5 wt
- the sintering aid S io 2, C a O , M g O
- additive composition with a total of one part by weight Y 2 0 3:. 0 5 wt
- X-ray diffraction confirmed that alumina as the main component and Y 2 O 3 as the additive composition existed as a crystal phase.
- the withstand voltage was measured as follows.
- the alumina-based porcelain composition is polished to a thickness of 1.0 ⁇ 0.05 mm using a polishing machine using diamond abrasive grains and the like, and measured with a dedicated withstand voltage measuring device.
- a needle-pointed probe is applied to the upper and lower surfaces of the alumina-based porcelain composition, and in this state, a high voltage generated by an oscillator and a coil from a constant voltage power supply is applied between the upper and lower probes.
- 20 kV to 1 kV in 10 seconds The applied voltage is increased stepwise at a ratio.
- the voltage at the time of dielectric breakdown of the sample was defined as the withstand voltage of the alumina ceramic composition.
- This withstand voltage measuring method is the same in each of the following Examples and Comparative Examples.
- the withstand voltage of the alumina-based porcelain composition of this example was 40 kV / mm.
- Y 2 0 3 as the additive composition was 1. 0 part by weight, in the same manner as in Example 1, and 1 0 0 parts by weight of alumina as the main component, a sintering aid S i 0 to 2 and C a CO 3 and M g O a total of 1 part by weight, to prepare a these, a mixed raw material was prepared.
- Example 2 100 parts by weight of alumina and 1 part by weight of sintering aids (SiO 2 , CaO, and MgO) were used. And an additive composition Y 2 O 3 : 1.0 part by weight as an alumina sintered ceramic composition as a composite sintered body, and a spark plug using the alumina sintered ceramic composition as an insulator. Obtained.
- the alumina-based porcelain composition of this example had a firing density of 3.95 g / cm 3 .
- the withstand voltage was 43 kV / mm.
- Example 3 except that the Y 2 0 3 and 2.0 parts by weight of additive composition, similarly as in Example 1, and 1 0 0 parts by weight of alumina as the main component, a sintering aid the S i ⁇ 2 and C a C 0 3 and M g O as the total 1 part by weight is, to prepare a these, a mixed raw material was prepared.
- Example 2 100 parts by weight of alumina and 1 part by weight of sintering aids (SiO 2 , CaO, and MgO) were used.
- additive composition as Y 2 0 3: 2.
- alumina ceramic composition as a composite sintered body consisting of 0 part by weight, and a spark plug using this alumina-based ceramic composition as a ceramic insulator Obtained.
- the alumina-based porcelain composition of this example had a firing density of 3.95 g / cm 3 .
- the withstand voltage was 43 kVZmm.
- Example 2 100 parts by weight of alumina and 1 part by weight of sintering aids (SiO 2 , CaO, and MgO) were used. And an additive composition Y 2 O 3 : 5.0 parts by weight as an alumina sintered ceramic composition as a composite sintered body, and a spark plug using the alumina sintered ceramic composition as an insulator. Obtained.
- the alumina-based porcelain composition of this example had a firing density of 3.95 g / cm 3 .
- the withstand voltage was 43 kVZmm.
- composition was 0.5 parts by weight, similarly to the above Symbol Example 1, and 1 0 0 parts by weight of alumina as the main component, is a sintering aid S i- - 0 2 - and C a CO 3 - at a and M g O a total of 1 part by weight, they were formulated, the mixed raw material was prepared.
- Example 2 100 parts by weight of alumina and 1 part by weight of sintering aids (SiO 2 , CaO, and MgO) were used. And an additive composition Sm 2 O 3 : 0.5 part by weight as an alumina-based ceramic composition as a composite sintered body, and a spark using the alumina-based ceramic composition as an insulator Got a brag.
- SiO 2 , CaO, and MgO sintering aids
- the firing density was 3.94 g / cm 3 .
- the withstand voltage was 39 kV mm.
- Example 6 Except that the S m 2 0 3 is additive composition was 1. 0 part by weight, similarly to the above Symbol Example 1, and 1 0 0 parts by weight of alumina as the main component, is a sintering aid as the S i 0 2 and C a C_ ⁇ 3 and M g O a total of 1 part by weight, they were formulated, the mixed raw material was prepared.
- alumina 1 0 0 parts by weight and the sintering 3 ⁇ 4 agent (S i ⁇ 2, C a O, M g O): Total 1 part by weight additive composition and S m 2 0 3:. 1 0 alumina ceramic composition as a composite sintered body consisting of parts, and a spark using the alumina porcelain set Narubutsu as an insulator Got a plug.
- the alumina-based porcelain composition of this example had a firing density of 3.95 g / cm 3 .
- the withstand voltage was 41.5 kVZmm.
- S m 2 O 3 as the additive composition 2. was 0 parts by weight, similarly to the above Symbol Example 1, and 1 0 0 parts by weight of alumina as the main component, is a sintering aid A total of 1 part by weight of SiO 2 , CaCO 3 and MgO was blended to prepare a mixed raw material.
- the alumina-based porcelain composition of this example had a firing density of 3.95 g / cm 3 .
- the withstand voltage was 4 1. S k V / mm.
- composition was 5.0 parts by weight, similarly to the above Symbol Example 1, and 1 0 0 parts by weight of alumina as the main component, is a sintering aid S i O 2 , C a C ⁇ 3 and M g O are 1 part by weight in total, These were blended to prepare a mixed raw material.
- alumina 1 0 0 parts by weight and the sintering aid (S i 0 2, C a O, M g O): Total 1 part by weight
- an additive composition Sm 2 O 3 5.0 parts by weight, an alumina ceramic composition as a composite sintered body, and a spark plug using the alumina ceramic composition as an insulator. Obtained.
- the alumina-based porcelain composition of this example had a firing density of 3.95 g / cm 3 .
- the withstand voltage was 41.5 kVZmm.
- Y b 2 O 3 as the additive composition was 0.5 parts by weight, similarly to the above Symbol Example 1, and 1 0 0 parts by weight of alumina as the main component, is a sintering aid A total of 1 part by weight of Si 2 , CaCO 3 and MgO was blended to prepare a mixed raw material.
- Example 2 100 parts by weight of alumina and 1 part by weight of sintering aids (SiO 2 , CaO, and MgO) were used.
- additive composition and Y b 2 O 3 alumina-ceramic composition as a composite sintered body consisting of 0.5 parts by weight, and a spa scratch the alumina porcelain set Narubutsu were, use as an insulator Grup plug.
- the firing density was 3.94 g / cm 3 .
- the withstand voltage was 39.5 kV / mm.
- composition was 1.0 parts by weight, similarly to the above Symbol Example 1, and 1 0 ⁇ parts by weight of alumina as the main component, is a sintering aid as the S i ⁇ 2 and C a C 0 3 and M g O a total of 1 part by weight, they were formulated, the mixed raw material was prepared.
- Example 2 100 parts by weight of alumina and sintering aids (SiO 2 , CaO, MgO): total Additive composition 1 part by weight Y b 2 0 3: 1. alumina ceramic composition as a composite sintered body consisting of 0 parts by weight, and, the alumina ceramic ⁇ Narubutsu as an insulator The used spark plug was obtained.
- alumina and sintering aids SiO 2 , CaO, MgO
- the alumina-based porcelain composition of this example had a firing density of 3.95 g / cm 3 .
- the withstand voltage was 42.5 kV mm.
- Y b 2 0 3 is the additive composition 2.
- Example 2 100 parts by weight of alumina and 1 part by weight of sintering aids (SiO 2 , CaO, and MgO) were used.
- additive composition and Y b 2 O 3 2. alumina ceramic composition as a composite sintered body consisting of 0 parts by weight, and, using this alumina porcelain set Narubutsu as an insulator spark Got a plug.
- the alumina-based porcelain composition of this example had a firing density of 3.95 g / cm 3 .
- the withstand voltage was 42.5 kVZmm.
- Example 12 As in Example 1 except that the additive composition Yb 2 O 3 was 5.0 parts by weight, alumina as a main component was added to 100 parts by weight. , as the S i 0 2 and C a CO 3 and M g O a total of 1 part by weight is sintering aid, they were formulated, the mixed raw material was prepared.
- Example 2 100 parts by weight of alumina and 1 part by weight of sintering aids (SiO 2 , CaO, and MgO) were used.
- the alumina-based porcelain composition of this example had a firing density of 3.95 g / cm 3 .
- the withstand voltage was 42.5 kVZ mm.
- N d 2 0 3 is added composition was 0.5 parts by weight, similarly to the above Symbol Example 1, and 1 0 0 parts by weight of alumina as the main component, is a sintering aid as the S i 0 2 and C a C_ ⁇ 3 and M g O a total of 1 part by weight, they were formulated, the mixed raw material was prepared.
- Example 2 100 parts by weight of alumina and 1 part by weight of sintering aids (SiO 2 , CaO, and MgO) were used.
- additive composition and N d 2 0 3 alumina porcelain composition as a composite sintered body consisting of 0.5 parts by weight, and to obtain a spark plug using the alumina ceramic ⁇ Narubutsu as insulator .
- the alumina-based porcelain composition of this example had a firing density of 3.95 g / cm 3 .
- the withstand voltage was 41 kVZmm.
- composition was 1.0 parts by weight, similarly to the above Symbol Example 1, and 1 0 0 part by weight of alumina as the main component, a sintering aid der A total of 1 part by weight of SiCO 2 and CaCO 3 and MgO was prepared and mixed to prepare a mixed raw material.
- Example 2 100 parts by weight of alumina and 1 part by weight of sintering aids (SiO 2 , CaO, and MgO) were used. And an additive composition Nd 2 O 3: 1.0 part by weight as an alumina ceramic composition as a composite sintered body, and a spark plug using this alumina ceramic composition as an insulator. Obtained.
- the alumina-based porcelain composition of this example had a firing density of 3.95 g / cm 3 .
- the withstand voltage was 43 kVZmm.
- Example 15 Except that the N d 2 0 3 is the additive composition 2. was 0 parts by weight, similarly to the above Symbol Example 1, and 1 0 0 parts by weight of alumina as the main component, is a sintering aid A total of 1 part by weight of SiO 2 , CaCO 3 and MgO was blended to prepare a mixed raw material.
- Example 2 100 parts by weight of alumina and 1 part by weight of sintering aids (SiO 2 , CaO, and MgO) were used.
- the alumina-based porcelain composition of this example had a firing density of 3.95 g / cm 3 .
- the withstand voltage was 43 kVZmm.
- N d 2 O 3 as the additive composition was 5.0 parts by weight, similarly to the above Symbol Example 1, and 1 0 0 parts by weight of alumina as the main component, is a sintering aid A total of 1 part by weight of SiO 2 , CaCO 3 and MgO was blended to prepare a mixed raw material.
- alumina - 1 0 0 parts by weight and the sintering aid - (S i- 0 2, C a OM g O): Total - 1 part by weight additive composition N d 2 0 3: 5.
- alumina ceramic composition as a composite sintered body consisting of 0 parts by weight, and, the alumina porcelain set Narubutsu as an insulator The used spark plug was obtained.
- the alumina-based porcelain composition of this example had a firing density of 3.95 g / cm 3 .
- the withstand voltage was 43 kVZmm.
- alumina 1 0 0 parts by weight and the sintering aid (S i 0 2, C a O, M g O): Total 1 part by weight And an additive composition Pr 6 On: 0.5 parts by weight of an alumina-based ceramic composition as a composite sintered body, and a spark plug using this alumina-based ceramic composition as an insulator. Obtained.
- the alumina-based porcelain composition of this example had a firing density of 3.95 g / cm 3 .
- the withstand voltage was 42 kVZmm.
- Example 2 In the same manner as in Example 1 except that the additive composition Pr 6 On was set to 1.0 part by weight, 100 parts by weight of alumina as a main component and Si as a sintering aid were used. O 2 , Ca CO 3, and MgO were mixed in a total of 1 part by weight to prepare a mixed raw material.
- Example 2 100 parts by weight of alumina and 1 part by weight of sintering aids (SiO 2 , CaO, and MgO) were added. And an additive composition Pr 6 O lx : 1.0 part by weight, an alumina ceramic composition as a composite sintered body, and a spark plug using this alumina ceramic composition as an insulator. Obtained. - - In the alumina-based ceramic composition of this example, sintering density was 3. 9 5 g X cm 3. The withstand voltage was 44 kV / mm.
- alumina 1 0 0 parts by weight and the sintering aid (S i 0 2, C a O, M g O): Total Alumina porcelain composition as a composite sintered body consisting of 1 part by weight and additive composition Pr 6 On: 2.0 parts by weight, and a spark plug using this alumina porcelain composition as an insulator Got.
- the sintering aid S i 0 2, C a O, M g O
- the firing density of the alumina porcelain composition of this example was 3.95 g / cm 3 .
- the withstand voltage was k VZmm.
- Example 2 100 parts by weight of alumina and 1 part by weight of sintering aids (SiO 2 , CaO, and MgO) were used. And an additive composition Pr 6 O xl : 5.0 parts by weight, thereby obtaining an alumina-based ceramic composition as a composite sintered body, and a spark plug using the alumina-based ceramic composition as an insulator.
- sintering aids SiO 2 , CaO, and MgO
- the firing density of the alumina porcelain composition of this example was 3.95 g / cm 3 .
- the withstand voltage was 44 kV / mm.
- the sintering aids Si 2 , C ′ a CO 3, and MgO were used as a total of 1 part by weight, and were mixed to prepare a mixed raw material.
- alumina 1 0 0 parts by weight and the sintering aid (S i ⁇ 2, C a O, M g O): Total 1 part by weight additive composition and D y 2 O 3: alumina-ceramic composition as a composite sintered body consisting of 0.5 parts by weight, and, using this alumina porcelain set Narubutsu as an insulator spark Got a plug.
- the alumina-based porcelain composition of this example had a firing density of 3.95 g / cm 3 .
- the withstand voltage was 40. Ok V / mm.
- D y 2 0 3 is additive composition was 1. 0 part by weight, similarly to the above Symbol Example 1, and 1 0 0 parts by weight of alumina as the main component, is a sintering aid and the S 1 0 2 0 & (0 3 and 1 ⁇ total 1 part by weight ⁇ 0, it was formulated, the mixed raw material was prepared.
- Example 2 100 parts by weight of alumina and 1 part by weight of sintering aids (SiO 2 , CaO, and MgO) were used.
- additive composition and D y 2 0 3 1. alumina ceramic composition as a composite sintered body consisting of 0 parts by weight, and using the alumina porcelain set Narubutsu as an insulator spark Got a plug.
- the alumina-based porcelain composition of this example had a firing density of 3.95 g / cm 3 .
- the withstand voltage was 43 kV / mm.
- D y 2 O 3 as the additive composition 2. was 0 parts by weight, similarly to the above Symbol Example 1, and 1 0 0 parts by weight of alumina as the main component, is a sintering aid S i O 2 - and C a CO 3 and M g O as the sum 1 part by weight, they were formulated, the mixed raw material was prepared.
- Example 2 100 parts by weight of alumina and 1 part by weight of sintering aids (SiO 2 , CaO, and MgO) were used.
- additive composition and D y 2 0 3 2.
- the alumina-based porcelain composition of this example had a firing density of 3.95 g / cm 3 .
- the withstand voltage was AS k VZmm.
- Example 2 4 Except that the D y 2 O 3 as the additive composition was 5.0 parts by weight, similarly to the above Symbol Example 1, and 1 0 0 parts by weight of alumina as the main component, is a sintering aid A total of 1 part by weight of SiO 2 , Ca CO 3, and MgO was blended to prepare a mixed raw material.
- alumina 1 0 0 parts by weight and the sintering aid (S i 0 2, C a O, M g O): Total 1 part by weight additive composition and D y 2 0 3: 5.
- alumina ceramic composition as a composite sintered body consisting of 0 parts by weight, and, using this alumina porcelain set Narubutsu as an insulator spark Got a plug.
- the firing density was 3.94 g / cm 3 .
- the withstand voltage was 43 kV / mm.
- alumina 1 0 0 parts by weight and the sintering aid (S i 0 2, C a 0, M g O): Total 1 part by weight additive composition and E r 2 0 3: alumina-ceramic composition as a composite sintered body consisting of 0.5 parts by weight, and, using this alumina porcelain set Narubutsu as an insulator spark Got a plug.
- S i 0 2, C a 0, M g O Total 1 part by weight additive composition
- E r 2 0 3 alumina-ceramic composition as a composite sintered body consisting of 0.5 parts by weight
- the alumina-based porcelain composition of this example had a firing density of 3.95 g / cm 3 .
- the withstand voltage was 40 kVZ mm.
- alumina 1 0 0 parts by weight and the sintering aid (S i 0 2, C a O, M g O): Total 1 part by weight additive composition and E r 2 0 3: 1.
- alumina ceramic composition as a composite sintered body consisting of 0 parts by weight, and a spark plug using the alumina ceramic sets Narubutsu as insulator Obtained.
- the alumina-based porcelain composition of this example had a firing density of 3.95 g / cm 3 .
- the withstand voltage was 43 kVZ mm.
- alumina 1 0 0 parts by weight and the sintering aid (S i 0 2, C a O, M g O): Total 1 part by weight And an additive composition Er 2 O 3 : 2.0 parts by weight as a composite sintered body, and a spark plug using this alumina porcelain composition as an insulator. Obtained.
- the alumina-based porcelain composition of this example had a firing density of 3.95 g / cm 3 .
- the withstand voltage was AS k VZmm.
- composition was 5.0 parts by weight, similarly to the above Symbol Example 1, and 1 0 0 parts by weight of alumina as the main component, is a sintering aid as the S i 0 2 and C a CO 3 and M g O a total of 1 part by weight, they were formulated, the mixed raw material was prepared.
- alumina 1 0 0 parts by weight and the sintering aid (S i 0 2, C a O, M g O): Total Additive composition 1 part by weight E r 2 0 3: 5.
- alumina porcelain composition as a composite sintered body consisting of 0 parts by weight, and, using this alumina porcelain set Narubutsu as an insulator I got a spark plug.
- the firing density was 3.94 g / cm 3 .
- the withstand voltage was 43 kV / mm.
- L a 2 0 3 a additive composition was 0.5 parts by weight, similarly to the above Symbol Example 1, and 1 0 0 parts by weight of alumina as the main component, is a sintering aid A total of 1 part by weight of Si 2 , CaCO 3 and MgO was blended to prepare a mixed raw material.
- Example 2 100 parts by weight of alumina and 1 part by weight of sintering aids (SiO 2 , CaO, and MgO) were used. And an additive composition La 2 O 3 : 0.5 part by weight as an alumina-based ceramic composition as a composite sintered body, and a spark using this alumina-based ceramic composition as an insulator Got a plug.
- alumina-based ceramic composition 100 parts by weight of alumina and 1 part by weight of sintering aids (SiO 2 , CaO, and MgO) were used.
- an additive composition La 2 O 3 0.5 part by weight as an alumina-based ceramic composition as a composite sintered body, and a spark using this alumina-based ceramic composition as an insulator Got a plug.
- the alumina-based porcelain composition of this example had a firing density of 3.95 g / cm 3 .
- the withstand voltage was 40 kV / mm.
- Example 3 Fei - Except that the L a 2 0 3 a additive composition was 1 0 part by weight, similarly to the above Symbol Example 1, and 1 0 0 parts by weight of alumina as the main component, baked A total of 1 part by weight of Si 2 , CaCO 3, and MgO as binders was blended to prepare a mixed raw material.
- Example 2 100 parts by weight of alumina and 1 part by weight of sintering aids (SiO 2 , CaO, and MgO) were used.
- additive composition and L a 2 0 3 1.
- the firing density of the alumina-based porcelain composition of this example was 3.95 g / cm 3 .
- the withstand voltage was 43 kV / mm.
- the L a 2 0 3 a additive composition 2. was 0 parts by weight, similarly to the above Symbol Example 1, and 1 0 0 parts by weight of alumina as the main component, is a sintering aid as the S i 0 2 and C a C 0 3 and M g O a total of 1 part by weight, they were formulated, the mixed raw material was prepared.
- Example 2 100 parts by weight of alumina and 1 part by weight of sintering aids (SiO 2 , CaO, and MgO) were used. And an additive composition La 2 O 3 : 2.0 parts by weight as an alumina sintered ceramic composition as a composite sintered body, and a spark plug using this alumina ceramic composition as an insulator. Obtained.
- the alumina-based porcelain composition of this example had a firing density of 3.95 g / cm 3 .
- the withstand voltage was AS k VZmm.
- the L a 2 0 3 a additive composition was 5.0 parts by weight, similarly to the above Symbol Example 1, and 1 0 0 parts by weight of alumina as the main component, is a sintering aid as the S i 0 2 and C a CO 3 and M g O a total of 1 part by weight -, they were blended, the mixture material was prepared.
- Example 2 100 parts by weight of alumina and 1 part by weight of sintering aids (SiO 2 , CaO, and MgO) were used. And an additive composition La 2 O 3 : 5.0 parts by weight as an alumina-based ceramic composition as a composite sintered body, and a spark using the alumina-based ceramic composition as an insulator Got a plug.
- sintering aids SiO 2 , CaO, and MgO
- the alumina-based porcelain composition of this example had a firing density of 3.95 g / cm 3 .
- the withstand voltage was 43 kVZmm.
- Example 3 3 In the same manner as in Example 1 except that the additive composition Eu 2 O 3 was 1.0 part by weight, 100 parts by weight of alumina as a main component and a sintering aid were used. A total of 1 part by weight of Si 2 , CaCO 3 and MgO was blended to prepare a mixed raw material.
- alumina 1 0 0 parts by weight and the sintering aid (S i 0 2, C a O, M g O): Total 1 part by weight additive composition and E u 2 0 3:. 1 0 alumina ceramic composition as a composite sintered body consisting of parts, and to obtain a spark plug using the alumina ceramic formed product as the insulator Was.
- the sintering aid S i 0 2, C a O, M g O
- the alumina-based porcelain composition of this example had a firing density of 3.95 g / cm 3 .
- the withstand voltage was 43 kVZmm.
- T b 2 O 3 as the additive composition was 1.0 parts by weight, similarly to the above Symbol Example 1, and 1 0 0 parts by weight of alumina as the main component, is a sintering aid as the S i 0 2 and C a C 0 3 and M g O a total of 1 part by weight, they were formulated, mixed original family were prepared.
- alumina 1 0 0 parts by weight and the sintering aid (S i 0 2, G a 0, M g O): Total 1 part by weight additive composition and T b 2 O 3:. 1 0 alumina ceramic composition as a composite sintered body consisting of parts, and a spark using the alumina porcelain set Narubutsu as an insulator Got the plug.
- the alumina-based porcelain composition of this example had a firing density of 3.95 g / cm 3 .
- the withstand voltage was S k VZmm.
- T m 2 O 3 as the additive composition was 1. 0 part by weight, similarly to the above Symbol Example 1, and 1 0 0 parts by weight of alumina as the main component, is a sintering aid as the S i ⁇ 2 and C a C 0 3 and M g O a total of 1 part by weight, These were blended to prepare a mixed raw material.
- alumina 1 0 0 parts by weight and the sintering aid (S i 0 2, C a O, M g O): Total 1 part by weight additive composition and T m 2 0 3:. 1 0 alumina ceramic composition as a composite sintered body consisting of parts, and a spark using the alumina porcelain set Narubutsu as an insulator Got the plug.
- the sintering aid S i 0 2, C a O, M g O
- the alumina-based porcelain composition of this example had a firing density of 3.95 g / cm 3 .
- the withstand voltage was 43 kVZ mm.
- Example 2 O 3 In the same manner as in Example 1 except that the additive composition Lu 2 O 3 was 1.0 part by weight, 100 parts by weight of alumina as a main component and a sintering aid were used. A total of 1 part by weight of SiO 2 , Ca CO 3, and MgO was blended to prepare a mixed raw material.
- alumina 1 0 0 parts by weight and the sintering aid (S i 0 2, C a O, M g O): Total 1 part by weight
- an additive composition Lu 2 O 3 1.0 part by weight as an alumina-based ceramic composition as a composite sintered body, and a spark using the alumina-based ceramic composition as an insulator Got the plug.
- the alumina-based porcelain composition of this example had a firing density of 3.95 g / cm 3 .
- the withstand voltage was 43 kV / mm.
- Example 2 In the same manner as in Example 1 except that the additive composition H 2 O 3 was 1.0 part by weight, alumina as a main component was 100 parts by weight, and a sintering aid was used. as the S i 0 2 and C a CO 3 and M g O a total of 1 part by weight, they were formulated, the mixed raw material was prepared.
- alumina 1 0 0 parts by weight and the sintering aid (S i 0 2, C a O, M g O): Total Alumina porcelain composition as a composite sintered body comprising 1 part by weight and additive composition H 2 O 3 : 1.0 part by weight, and this alumina porcelain composition as an insulator The used spark plug was obtained.
- the alumina-based porcelain composition of this example had a firing density of 3.95 gcm 3 .
- the withstand voltage was 43 kV / mm.
- Example 2 100 parts by weight of alumina and 1 part by weight of sintering aids (SiO 2 , CaO, and MgO) were used.
- additive composition and C e 0 2: give 1. alumina ceramic composition as a composite sintered body consisting of 0 parts by weight, and a spark plug using the alumina ceramic sets Narubutsu as insulator Was.
- the alumina-based porcelain composition of this example had a firing density of 3.95 g / cm 3 .
- the withstand voltage was 40 kVZ mm.
- Example 2 Thereafter, the same operation as in Example 1 was performed.
- 100 parts by weight of alumina and 1 part by weight of a sintering aid (SiO 2 , CaO, MgO) were used.
- a sintering aid SiO 2 , CaO, MgO
- SiO 2 , CaO, MgO a sintering aid
- an alumina-based porcelain composition as a composite sintered body and a spark plug using the same as an insulator were obtained. That is, in this comparative example, a conventional general spark plug was obtained.
- the sintering density of the alumina-based porcelain composition of this comparative example was 3.95 g / cm 3 .
- the withstand voltage was 30 kV / mm.
- Example 39 to 44 shown in Table 3 will be described.
- Composition that is, the above-mentioned second alumina-based porcelain composition.
- mixed raw material 1 Sintering aids SiO 2 and Ca CO 3 were added to 100 parts by weight of alumina as the main component, which was adjusted to a purity of 99.9% or more and an average particle size of 0.4 ⁇ m.
- the mixed raw material 2 is shown in Table 3 as the chemical formula of the composition of the crystal phase after sintering. That is, in this example, is shown as 3 A l 2 0 3 '2 S i 0 2.
- the parts by weight of the mixed raw material 2 are the parts by weight of the additive composition as they are. What has been described about these mixed raw materials 2 is the same in Examples 40 to 44 below. It is like.
- the mixed raw material 1 was mixed with the mixed raw material 1 so that the mixed raw material 2 became 1 part by weight, and mixed with pure water by a pulverizing means such as a ball mill for 24 hours, and then mixed with the final alumina.
- a mixed raw material of the porcelain composition was prepared.
- the mixed raw material obtained by mixing the mixed raw material 1 and the mixed raw material 2, that is, the mixed raw material as the raw material of the final composite sintered body is referred to as a mixed raw material 3. This also applies to the following Examples 40 to 44. Then, the mixed raw material 3 was dried, granulated, and press-formed to prepare a shape as a spark plug insulator.
- the center electrode is introduced into the insulator, and then the conductive glass sealing agent is filled by pressure. After that, the pressure is applied by using a stem, and then placed in a furnace for 30 minutes and heated to form a conductive glass seal. After softening the agent, the stem was immediately pressurized. After cooling it, a spark plug was obtained by attaching a housing with a ground electrode fixed to the outer periphery.
- alumina 1 0 0 parts by weight and the sintering aid (S io 2, C a O , M g O): additive composition with a total of one part by weight 3 A 1 2 0 3 ⁇ 2 S
- alumina porcelain composition as a composite sintered body consisting of iO 2 : 1 part by weight, and a spark plug using this alumina porcelain composition as an insulator were obtained.
- the withstand voltage of the alumina porcelain composition of this example was measured in the same manner as in Example 1 above, and in this example, the withstand voltage was 43 kVZm. m.
- the A 1 2 S i 0 5 is additive composition 1.
- the mixed-feed 1 The mixed raw material 1 and the mixed raw material 2 were prepared, and the mixed raw material 3 was prepared.
- Example 2 100 parts by weight and sintering aids (SiO 2 , CaO, MgO): total 1 and parts by weight, the additive composition a 1 2 S i O 5: . 1 0 part by weight and the Ca ⁇ Ranaru alumina ceramic composition as a composite sintered body, and the alumina ceramic composition insulator
- alumina 100 parts by weight and sintering aids (SiO 2 , CaO, MgO): total 1 and parts by weight
- the additive composition a 1 2 S i O 5: . 1 0 part by weight and the Ca ⁇ Ranaru alumina ceramic composition as a composite sintered body
- the alumina ceramic composition insulator The spark plug used was obtained.
- the alumina-based porcelain composition of this example had a firing density of 3.95 g / cm 3 .
- the withstand voltage was 42 kVZmm.
- the M g A 1 2 O 4 is added compositions to be between 1.0 parts by weight, except that were prepared for mixing raw materials 2, in the same manner as in Example 3 9, the mixed-feed 1 Preparation and mixing of mixed raw material 1 and mixed raw material 2 were performed to prepare mixed raw material 3-. - - then performs the similar as in Example 1, in this example, alumina: and 1 0 0 part by weight, the sintering aid (S i O 2, C a 0, M g O): if a total of 1 part by weight, the additive composition M g a 1 2 O 4: . 1 0 part by weight and the Ca ⁇ Ranaru alumina porcelain composition as a composite sintered body, and the alumina ceramic composition insulator The spark plug used was obtained.
- the alumina-based porcelain composition of this example had a firing density of 3.95 g / cm 3 .
- the withstand voltage was 40 kVZmm.
- the A 1 2 0 3 ⁇ ⁇ ⁇ 0 2 is added compositions to be between 1.0 part by weight, A mixed raw material 1 was prepared, and a mixed raw material 1 and a mixed raw material 2 were prepared in the same manner as in Example 39, except that the mixed raw material 2 was prepared, to thereby prepare a mixed raw material 3.
- Example 2 After that, the same operation as in Example 1 was performed.
- alumina 100 parts by weight, and sintering aids (SiO 2 , Ca 0, MgO): 1 weight in total and parts, the additive composition a 1 2 0 3 ⁇ T i O 2: 1. 0 parts by weight and the force, alumina porcelain composition as a Ranaru composite sintered body, and this ⁇ alumina electrolyte ceramic composition A spark plug using this as an insulator was obtained.
- the alumina-based porcelain composition of this example had a firing density of 3.95 g / cm 3 .
- the withstand voltage was 40 kVZmm.
- Example 2 After that, the same operation as in Example 1 was performed.
- 100 parts by weight of alumina was added, and sintering aids (SiO 2 , CaO, and MgO) were added to 1 weight in total and parts, the additive composition Y 2 S i ⁇ 5: 1.
- alumina ceramic composition as a double focus sintered body consisting of 0 parts by weight, and, the alumina ceramic composition as an insulator The used spark plug was obtained.
- the sintering density of the alumina-based porcelain composition of this example was 3.94 g / cm 3 .
- the withstand voltage was 41 kVZmm.
- the Y 3 A 1 5 0 12 an additive composition to be between 1.0 parts by weight, except that were prepared for mixing raw materials 2, in the same manner as in Example 3 9, of mixed-feed 1 Preparation and mixing of mixed raw material 1 and mixed raw material 2 Material 3 was prepared.
- Example 2 100 parts by weight and sintering aids (SiO 2 , CaO, MgO): total 1 and parts by weight, the additive composition Y 3 a 1 s 0 12: . 1 0 alumina ceramic composition of the parts and the composite sintered body consisting of, and, the alumina ceramic composition as the ceramic insulator
- alumina 100 parts by weight and sintering aids (SiO 2 , CaO, MgO): total 1 and parts by weight
- the additive composition Y 3 a 1 s 0 12 . 1 0 alumina ceramic composition of the parts and the composite sintered body consisting of, and, the alumina ceramic composition as the ceramic insulator
- the used spark plug was obtained.
- the alumina-based porcelain composition of this example had a firing density of 3.95 g / cm 3 .
- the withstand voltage was 41 kVZmm.
- the withstand voltages of Examples 39 to 44 are 40 kVZmm or more. It can be seen that in all of Examples 4 to 4, the withstand voltage characteristics were significantly improved compared to the comparative example.
- Example 4 shown in Table 4, these examples are for the additive composition, was adopted Bae Ropusukai preparative oxide R e A 1 ⁇ 3, That is, the above is the third alumina porcelain composition.
- Purity 9 9. respect to the average particle diameter 0. 4 mu alumina component 1 Ru der prepared to m 0 0 parts by weight 9% or more, S i O 2 and C a C 0 3 is a sintering aid And a mixed raw material in which 1 part by weight of MgO is added in total. This is designated as mixed raw material 1.
- the mixed raw material 2 is a second 4 YA 1 O 3 raw material as the additive composition in the composite sintered body of the example shown in Table also for, and the mixed raw material for the additive composition, mixed Raw material 2 Therefore, the mixed raw material 2 is shown in Table 4 as the chemical formula of the composition of the crystal phase after sintering. That is, in this example, are shown as a YA 1 0 3.
- the parts by weight of the mixed raw material 2 are the parts by weight of the additive composition as they are. The same is true for the mixed raw material 2 in the following Examples 46 to 56.
- the mixed raw material 1 was mixed with the mixed raw material 1 so that the mixed raw material 2 was 1 part by weight, and mixed with pure water by a pulverizing means such as a pole mill for 24 hours, and then the final alumina was mixed.
- a mixed raw material of the porcelain composition was prepared.
- the mixed raw material obtained by mixing the mixed raw material 1 and the mixed raw material 2, that is, the mixed raw material as the raw material of the final composite sintered body is referred to as mixed raw material 3. This also applies to the following Examples 46 to 56. Then, the mixed raw material 3 was dried, granulated, and press-formed to prepare a shape as a spark plug insulator.
- the baking density is 3.95 g / cm 3 (relative density 98.5%).
- a spark plug insulator made of an alumina porcelain composition was manufactured.
- the center electrode is inserted into this insulator, and then the conductive glass sealant is filled by pressurization, and then pressurized using a stem, then placed in a furnace for 30 minutes, and heated to form a conductive glass sealant. After softening, the stem was immediately pressurized. After cooling, a spark plug was obtained by attaching a housing with a ground electrode fixed to the outer periphery.
- alumina 1 0 0 parts by weight and the sintering aid (S i O 2, C a O, M g O): Composition added to the total 1 part by weight thereof YA 1 0 3: 1 double
- S i O 2, C a O, M g O the sintering aid
- the withstand voltage of the alumina-based porcelain composition of this example was measured in the same manner as in Example 1 above.
- the withstand voltage was 44 kVZmm.
- mixed raw material 1 Preparation of mixed raw material 1 in the same manner as in Example 39 above except that mixed raw material 2 was prepared so that the added composition CeAlO 3 was 1.0 part by weight. Then, mixed raw material 1 and mixed raw material 2 were mixed to prepare mixed raw material 3.
- Example 2 do the same manner as in Example 1, in this example, alumina: and 1 0 0 part by weight, the sintering aid (S i 0 2, C a O, M g O): Total 1 and parts by weight, the additive composition C e a 1 O 3: 1. alumina ceramic composition as a composite sintered body consisting of 0 parts by weight, and, the alumina ceramic composition as an insulator The used spark plug was obtained.
- the sintering aid S i 0 2, C a O, M g O
- the alumina-based porcelain composition of this example had a firing density of 3.95 g / cm 3 . Also, the withstand voltage was 40 kV / mm.
- the N d A 1 O 3 as the additive composition to be between 1.0 parts by weight, except that were prepared for mixing raw materials 2, in the same manner as in Example 3 9, preparation of mixed-feed 1 Then, mixed raw material 1 and mixed raw material 2 were mixed to prepare mixed raw material 3.
- alumina and 1 0 0 part by weight, the sintering aid (S i 0 2, C a O, M g O): Total 1 and parts by weight, the additive composition N d a 1 O 3: 1.
- the alumina-based porcelain composition of this example had a firing density of 3.95 g / cm 3 .
- the withstand voltage was 44 kV / mm.
- mixed raw material 1 Preparation of mixed raw material 1 in the same manner as in Example 39 except that mixed raw material 2 was prepared so that the added composition Pr A 1 O 3 was 1.0 part by weight. Then, mixed raw material 1 and mixed raw material 2 were mixed to prepare mixed raw material 3.
- Example 2 100 parts by weight of alumina and sintering aid (Sio or CaO, MgO): 1 weight in total and parts, the additive composition P r a 1 O 3:. 1 0 part by weight and the alumina ceramic composition as a composite sintered body consisting of, and, using this alumina-based ceramic composition as the insulator spark Got the plug.
- alumina and sintering aid Sio or CaO, MgO
- the firing density of the alumina porcelain composition of this example was 3.95 g / cm 3 .
- the withstand voltage was 43 kVZmm.
- Example 2 100 parts by weight and sintering aids (SiO 2 , Ca 0, MgO): total 1 and parts by weight, the additive composition S mA 1 0 3:. 1 0 alumina porcelain composition as a composite sintered body consisting of parts, and a spark plug using this alumina-based ceramic composition as the ceramic insulator Obtained.
- the firing density was 3.94 g / cm 3 .
- the withstand voltage was 43 kVZmm.
- the E u A 1 0 3 is the additive composition to be between 1.0 parts by weight, except that were prepared for mixing raw materials 2, in the same manner as in Example 3 9, preparation of mixed-feed 1 Then, mixed raw material 1 and mixed raw material 2 were mixed to prepare mixed raw material 3.
- Example 2 100 parts by weight and sintering aids (SiO 2 , CaO, MgO): total 1 and parts by weight, the additive composition E u a 1 O 3: 1. alumina ceramic composition as a composite sintered body consisting of 0 parts by weight, and, the alumina ceramic composition as an insulator The used spark plug was obtained.
- the alumina-based porcelain composition of this example had a firing density of 3.95 g / cm 3 .
- the withstand voltage was 40 kVZmm.
- the G d A 1 O 3 as the additive composition to be between 1.0 parts by weight, except that were prepared for mixing raw materials 2, in the same manner as in Example 3 9, preparation of mixed-feed 1 Then, mixed raw material 1 and mixed raw material 2 were mixed to prepare mixed raw material 3.
- Example 2 100 parts by weight and sintering aids (SiO 2 , CaO, MgO): total 1 and parts by weight, the additive composition G d a 1 O 3: 1. alumina ceramic composition as a composite sintered body consisting of 0 parts by weight, and, the alumina ceramic composition as an insulator The used spark plug was obtained.
- the alumina-based porcelain composition of this example had a firing density of 3.95 g / cm 3 .
- the withstand voltage was 42 kV mm.
- the T b A 1 0 3 is the additive composition to be between 1.0 parts by weight, except that were prepared for mixing raw materials 2, in the same manner as in Example 3 9, mixed
- the mixed raw material 1 was prepared, and the mixed raw material 1 and the mixed raw material 2 were mixed to prepare a mixed raw material 3.
- Example 2 do the same manner as in Example 1, in this example, alumina: and 1 0 0 part by weight, the sintering aid (S i 0 2, C a O, M g O): Total 1 and parts by weight, the additive composition T b a 1 0 3:. 1 0 alumina ceramic composition as a composite sintered body composed of the parts by weight, and, the alumina ceramic composition as an insulator The used spark plug was obtained.
- the sintering density of the alumina porcelain composition of this example was 3.95 g X cm 3 .
- the withstand voltage was 43 kV / mm.
- the D y A 1 O 3 as the additive composition to be between 1.0 parts by weight, except that were prepared for mixing raw materials 2, in the same manner as in Example 3 9, preparation of mixed-feed 1 Then, the mixed subject 1 was mixed with the mixed raw material 2 to prepare the mixed subject 3.
- Example 2 do the same manner as in Example 1, in this example, alumina: and 1 0 0 part by weight, the sintering aid (S i 0 2, C a O, M g O): Total 1 and parts by weight, the additive composition D y a 1 O 3:. 1 0 alumina ceramic composition as a composite sintered body consisting of parts, and the alumina ceramic composition as an insulator The used spark plug was obtained.
- the sintering aid S i 0 2, C a O, M g O
- the alumina-based porcelain composition of this example had a firing density of 3.95 g / cm 3 .
- the withstand voltage was 43 kV / mm.
- the H 0 A 1 0 3 is the additive composition to be between 1.0 parts by weight, except that were prepared for mixing raw materials 2, in the same manner as in Example 3 9, preparation of mixed-feed 1 Then, mixed raw material 1 and mixed raw material 2 were mixed to prepare mixed raw material 3.
- the alumina-based porcelain composition of this example had a firing density of 3.95 g / cm 3 .
- the withstand voltage was 41 kV / mm.
- Example 2 100 parts by weight and sintering aids (SiO 2 , CaO, MgO): total 1 Parts by weight and an additive composition LuA103 : 1.0 parts by weight, and an alumina-based ceramic composition as a composite sintered body, and the alumina-based ceramic composition as an insulator.
- alumina 100 parts by weight and sintering aids (SiO 2 , CaO, MgO): total 1 Parts by weight and an additive composition LuA103 : 1.0 parts by weight, and an alumina-based ceramic composition as a composite sintered body, and the alumina-based ceramic composition as an insulator.
- the used spark plug was obtained.
- the alumina-based porcelain composition of this example had a firing density of 3.95 g / cm 3 .
- the withstand voltage was 42 kV / mm.
- Example 2 100 parts by weight and sintering aids (SiO 2 , CaO, MgO): total 1 and parts by weight, the additive composition L a a 1 0 3: 1. alumina porcelain composition as a composite sintered body consisting of 0 parts by weight, and this alumina A spark plug using the porous ceramic composition as an insulator was obtained.
- sintering aids SiO 2 , CaO, MgO
- the alumina-based porcelain composition of this example had a firing density of 3.95 g / cm 3 .
- the withstand voltage was 40 kV / mm.
- the withstand voltage is 40 kV / mm or more. It can be seen that in all of the examples 5 to 56, the withstand voltage characteristics were significantly improved as compared with the comparative example.
- Main component sintering aid sintered sintering density other than sintering aid withstanding voltage Example number A1 2 0 3 Si0 2 CaO MgO additive composition (g / cn. 3) ( kV / mm)
- Example 1 100 0.86 0.04 0.10 Y 2 O 3 0.5 3.95 40
- Example 2 100 0.86 0.04 0.10 ⁇ 2 ⁇ 3 1.0 3.95 43
- Example 3 100 0.86 0.04 0.10 ⁇ 3 2.0 3.95 43
- Example 4 100 0.86 0.04 0.10 ⁇ 2 ⁇ 3 5.0 3.95 43
- Example 5 100 0.86 0.04 0.10 Sm 2 0 3 0.5 3.94 39
- Example 6 100 0.86 0.04 0.10 Sm 2 0 3 1.0 3.95 41.5!
- Example 7 100 0.86 0.04 0.10 Sm 2 0 3 2.0 3.95 41.5
- Example 8 100 0.86 0.04 0.10 Sm 2 0 3 5.0 3.95 41.5
- Example 9 100 0.86 0.04 0.10 Yb 2 0 3 0.5 3.94 39.5
- Example 10 100 0.86 0.04 0.10 Yb 2 0 3 1.0 3.95 42.5
- Example 11 100 0.86 0.04 0.10 Yb 2 0 3 2.0 3.95 42.5
- Example 12 100 0.86 0.04 0.10 Yb 2 0 3 5.0 3.95 42.5
- Example 13 100 0.86 0.04 0.10 Nd 2 0 3 0.5 3.95 41
- Example 14 100 0.86 0.04 0.10 Nd 2 0 3 1.0 3.95 43
- Example 15 100 0.86 0.04 0.10 Nd 2 0 3 2.0 3.95 43
- Example 16 100 0.86 0.04 0.10 Nd 2 0 3 5.0 3.95 43
- Example 17 100 0.86 0.04 0.10 0.5 3.95 42
- Example 18 100 0.86 0.04 0.10 Pr 6
- Example 20 100 0.86 0.04 0.10 Pr 6 0: 1 5.0 3.95 44
- Example 21 100 0.86 0.04 0.10 Dy 2 0 3 0.5 3.95 40
- Example 22 100 0.86 0.04 0.10 Dy 2 0 3 1.0 3.95 43
- Example 23 100 0.86 0.04 0.10 Dy 2 0 3 2.0 3.95 43
- Example 24 100 0.86 0.04 0.10 Dy 2 0 3 5.0 3.94 43
- Example 25 100 0.86 0.04 0.10 Er 2 0 3 0.5 3.95 40
- Example 26 100 0.86 0.04 0.10 Er 2 0 3 1.0 3.95 43
- Example 27 100 0.86 0.04 0.10 Er 2 0 3 2.0 3.95 43
- Example 28 100 0.86 0.04 0.10 Er 2 0 3 5.0 3.94 43
- Example 29 100 0.86 0.04 0.10 La 2 0 3 0.5 3.95 40
- Example 30 100 0.86 0.04 0.10 La 2 0 3 1.0 3.95 43
- Example 31 100 0.86 0.04 0.10 La 2 0 3 2.0 3.95 43
- Example 32 100 0.
- Example 39 100 0.86 0.04 0.10 3.95 43 • 2Si0 2 ⁇ ⁇ ⁇
- Example 40 100 0.86 0.04 0.10 Al 2 Si0 5 1.0 3.95 42
- Example 41 100 0.86 0.04 0.10 MgAl 2 0 4 1.0 3.95 40
- Example 43 100 0.86 0.04 0.10 YSi0 5 1.0 3.94
- Example 44 100 0.86 0.04 0.10 Y 3 Al 5 0 12 1.0 3.95 41
- Example 45 100 0.86 0.04 0.10 YA10 3 1.0 3.95 44
- Example 46 100 0.86 0.04 0.10 CeA10 3 1.0 3.95 40
- Example 47 100 0.86 0.04 0.10 NdA10 3 1.0 3.95 44
- Example 48 100 0.86 0.04 0.10 PrA10 3 1.0 3.95 43
- Example 49 100 0.86 0.04 0.10 SmA10 3 1.0 3.94 43
- Example 50 100 0.86 0.04 0.10 EuA10 3 1.0 3.95 40
- Example 51 100 0.86 0.04 0.10 GdA10 3 1.0 3.95 42
- Example 52 100 0.86 0.04 0.10 TbA10 3 1.0 3.95 43
- Example 53 100 0.86 0.04 0.10 DyA10 3 1.0 3.94 43
- Example 54 100 0.86 0.04 0.10 HoA10 3 1.0 3.95 41
- Example 55 100 0.86 0.04 0.10 LuA10 3 1.0 3.95 42
- Example 56 100 0.86 0.04 0.10 LaA10 3 1.0 3.95 40 Comparative example 100 0.86 0.04 0.10 3.95
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Composite Materials (AREA)
- Compositions Of Oxide Ceramics (AREA)
- Spark Plugs (AREA)
- Ignition Installations For Internal Combustion Engines (AREA)
Abstract
Description
Claims
Priority Applications (3)
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EP04773682A EP1669333A1 (en) | 2003-10-03 | 2004-10-01 | Aluminous ceramic composition and spark plug including the same |
JP2005514505A JPWO2005033041A1 (ja) | 2003-10-03 | 2004-10-01 | アルミナ質磁器組成物およびそれを用いたスパークプラグ |
US11/207,002 US20060186780A1 (en) | 2003-10-03 | 2005-08-19 | Alumina-based ceramic composition and spark plug using the same |
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JP2003-345707 | 2003-10-03 | ||
JP2003345707 | 2003-10-03 |
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US11/207,002 Continuation US20060186780A1 (en) | 2003-10-03 | 2005-08-19 | Alumina-based ceramic composition and spark plug using the same |
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EP (1) | EP1669333A1 (ja) |
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WO2009119097A1 (ja) | 2008-03-27 | 2009-10-01 | 日本特殊陶業株式会社 | スパークプラグ |
US7598661B2 (en) * | 2006-06-23 | 2009-10-06 | Federal-Mogul World Wide, Inc | Spark plug |
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WO2010109792A1 (ja) | 2009-03-26 | 2010-09-30 | 日本特殊陶業株式会社 | スパークプラグ |
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JP2014144897A (ja) * | 2013-01-30 | 2014-08-14 | Kyocera Corp | アルミナ質焼結体およびこれを用いた耐電圧部材 |
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CA2287241A1 (en) * | 1998-02-27 | 1999-09-02 | Ngk Spark Plug Co., Ltd. | Spark plug, alumina insulator for spark plug, and method of manufacturing the same |
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- 2004-10-01 JP JP2005514505A patent/JPWO2005033041A1/ja not_active Withdrawn
- 2004-10-01 WO PCT/JP2004/014880 patent/WO2005033041A1/ja active Application Filing
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JP2016160118A (ja) * | 2015-02-27 | 2016-09-05 | 株式会社デンソー | アルミナ質焼結体及びスパークプラグ |
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Also Published As
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---|---|
JPWO2005033041A1 (ja) | 2006-12-14 |
EP1669333A1 (en) | 2006-06-14 |
US20060186780A1 (en) | 2006-08-24 |
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