WO2014025062A1 - 窒化珪素質焼結体および熱伝導部材 - Google Patents
窒化珪素質焼結体および熱伝導部材 Download PDFInfo
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Definitions
- the present invention relates to a silicon nitride sintered body and a heat conduction member.
- silicon nitride sintered bodies are used as industrial parts such as engine parts, molten metal parts, cutting tools, fast reactor parts and molten metal parts.
- Patent Document 1 As an example of such a silicon nitride sintered body, for example, in Patent Document 1, 2 to 15 wt% of calcium oxide, 0.01 to 10 wt% of magnesium oxide and 0.01 to 10 wt% of aluminum oxide are converted in terms of oxides. A spark plug for an internal combustion engine made of a sintered body containing 0 to 15 wt% has been proposed.
- the sintered body mainly composed of silicon nitride described in Patent Document 1 has a problem that it is corroded when exposed to a cleaning liquid or a coolant containing an alkali component.
- a component having high corrosion resistance to an alkali metal is used as a sintering aid, there is a problem that if the content is too large, the thermal conductivity of the sintered silicon nitride sintered body is lowered. It was.
- the present invention has been proposed in order to solve the above-described problems, and an object thereof is to provide a silicon nitride sintered body and a heat conductive member having high corrosion resistance and high thermal conductivity against an alkali component. is there.
- the silicon nitride based sintered body of the present invention has a silicon nitride crystal and a grain boundary phase containing at least one of an oxide of sodium and an oxide of potassium, and the oxide of sodium and the oxidation of potassium object content, and is characterized in that the total weight respectively of at Na 2 O, less than 1 wt% to 0.2 wt% in total of the values in terms of K 2 O.
- the heat conducting member of the present invention contains a magnesium oxide in the grain boundary phase, a first region having a relatively large value of the characteristic X-ray intensity of the magnesium, and the characteristic X of the magnesium.
- a silicon nitride sintered body having a second region having a relatively small line diffraction value, at least the first region being exposed, and a heat source, wherein the heat source is disposed on the first region side. It is characterized by being arranged.
- the silicon nitride sintered body of the present invention it is possible to have both high corrosion resistance against alkali components and high thermal conductivity.
- the corrosion resistance against the alkali component is highly reliable, and the heat of the heat source can be efficiently transmitted.
- FIG. 1 An example of a structure made of a silicon nitride sintered body of the present embodiment is shown, (a) is a longitudinal sectional view, and (b) is an enlarged view of a section taken along line XX ′ of (a). . It is a longitudinal section showing an example of a heat conduction device provided with a heat conduction member of this embodiment.
- the silicon nitride-based sintered body of the present embodiment includes a silicon nitride crystal and a grain boundary phase containing at least one of a sodium oxide and a potassium oxide, and includes a sodium oxide and a potassium oxide. Is a total of values converted to Na 2 O and K 2 O in the total mass, respectively, and is 0.2 mass% or more and 1 mass% or less.
- the presence of the silicon nitride crystal can be confirmed by measuring and identifying it with an X-ray diffractometer (XRD), for example.
- XRD X-ray diffractometer
- the silicon nitride crystal may contain inevitable impurities.
- the grain boundary phase refers to a region other than the silicon nitride crystal, and there are crystals other than silicon nitride and an amorphous phase.
- sodium oxide or potassium oxide is, for example, a sodium oxide, an electron beam irradiated to the grain boundary phase in an analysis using an energy dispersive X-ray analyzer (EDX). It is only necessary that Na and O (oxygen) are contained in the element detected by spectrally analyzing the energy of the characteristic X-rays generated by the above. Moreover, the presence position of Na and the presence position of O should just overlap by the confirmation of the mapping using an electron beam microanalyzer (EPMA).
- EPMA electron beam microanalyzer
- the total mass is the total mass (content) of all components constituting the silicon nitride sintered body, and the total mass is 100% by mass.
- the total content of sodium oxide and potassium oxide in terms of Na 2 O and K 2 O in the total mass is 0.2% by mass or more, so that the oxides of sodium and potassium are oxidized. Since the product is difficult to react with the alkali component, the corrosion resistance of the silicon nitride sintered body to the alkali component is increased.
- the content of sodium oxide and potassium oxide is 1% by mass or less in terms of the total of the values converted to Na 2 O and K 2 O, respectively, in the total mass, so that the silicon nitride-based sintered body In the firing step, the number of pores existing in the sintered silicon nitride sintered body due to vaporization of the oxide of sodium and the oxide of potassium can be reduced. Therefore, there is little decrease in the thermal conductivity of the silicon nitride sintered body, and the thermal conductivity of the silicon nitride sintered body is kept high.
- the content of sodium oxide and potassium oxide is 0.2% by mass or more in total of the values converted to Na 2 O and K 2 O, respectively, out of the total mass. By being 1 mass% or less, it can have high corrosion resistance with respect to an alkali component, and high heat conductivity.
- the silicon nitride-based sintered body of the present embodiment has a silicon nitride content of 80% by mass or more in terms of Si 3 N 4 in the total mass, and particularly 85% by mass or more. This is preferable because conductivity and mechanical strength tend to increase.
- the content of silicon nitride in terms of Si 3 N 4 is determined by measuring the nitrogen content in the silicon nitride sintered body with a nitrogen analyzer, and converting the nitrogen content into Si 3 N 4 . What is necessary is just to convert and calculate.
- the content of sodium oxide in terms of Na 2 O and the content of potassium oxide in terms of K 2 O are determined by X-ray fluorescence analyzer or ICP (Inductively Coupled Plasma) emission. using a spectroscopic analyzer, Na, after obtaining the content of K, can be obtained by converting the Na 2 O, K 2 O, respectively.
- the silicon nitride sintered body of the present embodiment includes calcium oxide in the grain boundary phase, and the content of calcium oxide is 2.2% by mass or more and 5.2% by mass in terms of CaO in the total mass. % Or less is preferable.
- the content of calcium oxide is in the above range, calcium oxide promotes densification of silicon nitride crystals and increases mechanical strength. Therefore, the mechanical strength of the silicon nitride-based sintered body is increased. Since the ratio of the grain boundary phase containing calcium oxide is not too high, the thermal conductivity of the silicon nitride sintered body can be kept high.
- the silicon nitride sintered body of this embodiment includes magnesium oxide in the grain boundary phase, and the content of magnesium oxide is 0.1% by mass or more and 0.6% by mass in terms of MgO in the total mass. It is preferable that:
- the magnesium oxide content is in the above range, the inclusion of magnesium oxide in the grain boundary phase can increase the fracture toughness of the silicon nitride-based sintered body, and silicon nitride during sintering. Since the crystal densification and the crystallization of crystals other than silicon nitride in the grain boundary phase are promoted, the mechanical strength of the silicon nitride sintered body can be increased.
- the thermal conductivity of the silicon nitride-based sintered body can be maintained high, and the content of magnesium oxide having a negative redox potential is set in the above range.
- the oxidation resistance of the silicon nitride sintered body can be maintained.
- the silicon nitride sintered body of this embodiment includes aluminum oxide in the grain boundary phase, and the aluminum oxide content is 5.3% by mass in terms of Al 2 O 3 in the total mass.
- the content is preferably 8.6% by mass or less.
- the inclusion of aluminum oxide in the grain boundary phase can increase the fracture toughness of the silicon nitride-based sintered body, and the denseness of the silicon nitride crystals.
- the mechanical strength of the silicon nitride sintered body can be increased by promoting the formation and suppressing the abnormal grain growth. Furthermore, since the content is not so high that sialon having a thermal conductivity lower than that of silicon nitride is easily formed, the thermal conductivity of the silicon nitride based sintered body can be kept high.
- the presence of calcium oxide, magnesium oxide, and aluminum oxide in the grain boundary phase may be confirmed using EDX or EPMA as in the case of the above-described confirmation of sodium oxide.
- the content may be measured and calculated using a fluorescent X-ray analyzer or an ICP emission spectroscopic analyzer.
- the silicon nitride sintered body of this embodiment it is suitable for the silicon nitride sintered body of this embodiment that gehlenite is included in the grain boundary phase.
- gehlenite is included in the grain boundary phase, since the ratio of the amorphous phase in the grain boundary phase can be reduced, the rigidity of the silicon nitride based sintered body can be increased.
- the composition formula of Gehlenite for example, but as it can be shown as Ca 2 Al 2 SiO 7, is not limited to the stoichiometric composition.
- the silicon nitride sintered body of this embodiment has magnesium and sodium dissolved in gehlenite.
- the contents of magnesium and sodium in the silicon nitride sintered body are the same, when magnesium and sodium are dissolved in gehlenite, the abundance of crystals (gehlenite) in the grain boundary phase increases, and the amorphous Since the existence ratio of the mass phase becomes low, the deformation of the grain boundary phase can be suppressed and the rigidity of the silicon nitride sintered body can be increased.
- composition formula of gehlenite magnesium and sodium are dissolved in, for example, ((Ca 1- (a + b), Na a, Mg b) 2 (Al 1- (c + d), Si c, Mg d) 2 (Si 1-(e + f) , Al e , Mg f ) O 7 ) (where 0 ⁇ a + b ⁇ 1, 0 ⁇ c + d ⁇ 1, 0 ⁇ e + f ⁇ 1).
- the confirmation of the existence of gehlenite in the grain boundary phase of the silicon nitride sintered body can be confirmed by measuring and identifying using XRD. Whether or not magnesium and sodium are dissolved in gehlenite is determined using a transmission electron microscope (TEM) equipped with an energy dispersive X-ray spectrometer (EDS) or a wavelength dispersive X-ray spectrometer (WDS). When the element contained in gehlenite is confirmed by using it, if magnesium and sodium are contained, it is considered that magnesium and sodium are dissolved in gehlenite.
- TEM transmission electron microscope
- EDS energy dispersive X-ray spectrometer
- WDS wavelength dispersive X-ray spectrometer
- the surface layer is dotted with first compounds containing iron and silicon, and the number of first compounds having an equivalent circle diameter of 0.05 ⁇ m or more and 5 ⁇ m or less is 1 mm. It is preferable that the number is 2.0 ⁇ 10 4 or more and 2.0 ⁇ 10 5 or less per two .
- the surface layer in this embodiment means the part in the range less than 1 mm deep from the surface of a silicon nitride sintered body.
- the first compound containing iron and silicon is a compound composed of iron and silicon (for example, FeSi 3 , FeSi 2, etc.), or iron and silicon, and oxygen, aluminum, magnesium, calcium, sodium, and potassium. It is a compound consisting of at least one of the elements.
- the surface layer is dotted with second compounds containing tungsten and silicon, and the number of second compounds having an equivalent circle diameter of 0.05 ⁇ m or more and 5 ⁇ m or less is 1 mm. It is preferable that the number is 2.0 ⁇ 10 4 or more and 2.0 ⁇ 10 5 or less per two .
- the surface of the silicon nitride sintered body has a strong tendency to blacken, so that the surface is less likely to have color unevenness, and even if mechanical stress is applied, the generation of cracks is suppressed. Can do.
- the second compound containing tungsten and silicon is a compound made of tungsten and silicon (for example, W 5 Si 3 , W 3 Si 2, etc.), or tungsten and silicon, and oxygen, aluminum, magnesium, calcium.
- the first compound containing iron and silicon and the second compound containing tungsten and silicon are interspersed in the surface layer is EPMA if it is the first compound containing iron and silicon.
- EPMA Whether or not the first compound containing iron and silicon and the second compound containing tungsten and silicon are interspersed in the surface layer.
- the number per 1 mm 2 of the first compound containing iron and silicon having an equivalent circle diameter of 0.05 ⁇ m or more and 5 ⁇ m or less and the second compound containing tungsten and silicon is set to a magnification of 1000 using a scanning electron microscope.
- a range is set so that the area is 10.8 ⁇ 10 4 ⁇ m 2 (the length in the horizontal direction is 127 ⁇ m and the length in the vertical direction is 85.3 ⁇ m).
- the image analysis software “A Image-kun” (registered trademark, manufactured by Asahi Kasei Engineering Co., Ltd.) may be used for analysis by a technique called particle analysis.
- the threshold value is an index indicating the brightness of the reflected electron image
- each point (each pixel) in the reflected electron image is For example, it may be set to 1.5 times to 1.8 times the peak value of the histogram indicating brightness.
- the threshold values can be appropriately set so that each compound can be identified by color tone.
- An optical microscope may be used instead of the scanning electron microscope.
- the silicon nitride sintered body of this embodiment includes magnesium aluminate in the grain boundary phase.
- magnesium aluminate is included in the grain boundary phase, magnesium aluminate has higher corrosion resistance to the alkali component than silicon nitride, so that the corrosion resistance to the alkali component can be further increased.
- the silicon nitride sintered body of the present embodiment preferably has a low rare earth metal content and a rare earth metal content of 0.1% in order to have high corrosion resistance to not only the alkali component but also the acid component. It is suitable that it is below mass%.
- FIG. 1A and 1B show an example of a structure made of a silicon nitride sintered body according to the present embodiment.
- FIG. 1A is a longitudinal sectional view
- FIG. 1B is an enlarged view taken along line XX ′ of FIG. FIG.
- a structure 10 made of a silicon nitride-based sintered body shown in FIG. 1 is a cylindrical body having a bottom.
- heat from a heat source arranged in the cylindrical body is transmitted to the outside of the cylindrical body, or outside the cylindrical body. It is used for the purpose of transmitting the heat of the heat source arranged in the cylinder to the cylindrical body.
- the silicon nitride-based sintered body has a silicon nitride crystal and a grain boundary phase containing at least one of a sodium oxide and a potassium oxide.
- the content of the oxide are each Na 2 O of the total weight, with 1% by mass or less than 0.2 mass% in total of the values in terms of K 2 O, further comprising an oxide of magnesium in the grain boundary phase,
- a first region 1 having a relatively large value of the characteristic X-ray intensity of magnesium and a second region 2 having a relatively small value of the characteristic X-ray intensity of magnesium are provided, and the first region 1 is provided on the heat source side. Is located, that is, the first region 1 is preferably exposed.
- FIG. 1 shows an example in which the inner peripheral surface side of the cylindrical body is the first region 1 and the outer peripheral surface side is the second region 2.
- the structure 10 shown in FIG. 1 is made of a silicon nitride-based sintered body that satisfies the above-described configuration, the density in the first region 1 is higher than that in the second region 2, so that heat from the heat source is generated.
- the first area 1 can be received efficiently and transmitted to the outside via the second area 2.
- the characteristic X-ray intensity value of magnesium is compared with the thickness from one surface (inner periphery in FIG. 1) of the cross section of the structure 10 in FIG. 1B by, for example, magnesium color mapping using EPMA. The 20% portion in the direction and the 20% portion in the thickness direction from the other surface (the outer periphery in FIG. 1) are confirmed.
- the color mapping if the value of the characteristic X-ray intensity is small, it is indicated by a cold color system, and if the value of the characteristic X-ray intensity is large, it is indicated by a warm color system.
- the first region 1 is shown in a color tone on the warm color side from the second region 2, and the second region 2 is shown in a color tone on the cold color system side than the first region 1.
- the number of pores per unit area is preferably smaller in the first region 1 than in the second region 2. With such a configuration, the density in the first region 1 becomes higher, so that heat from the heat source can be received and transmitted more efficiently.
- the number of pores in the first region 1 and the second region 2 may be obtained by obtaining the number per unit area in each cross section.
- the cross section is polished and an optical microscope is used to obtain a magnification.
- the cross section was photographed with a CCD camera at a magnification of 200, and an image analysis device (LUZEX series manufactured by Nireco Corp.) used a visual field measurement area of 2.25 ⁇ 10 ⁇ 2 mm 2 and a measurement field number of 20, that is,
- the total number of measured areas may be 4.5 ⁇ 10 ⁇ 1 mm 2
- the number of pores per unit area may be counted
- the number of pores in the first region 1 and the second region 2 may be compared.
- the grain boundary phase further contains an oxide of aluminum
- the second region 2 Is provided with a third region having a relatively large value of characteristic X-ray intensity of aluminum and a fourth region having a relatively small value of characteristic X-ray intensity of aluminum, and the third region is exposed. It is preferable that When such a configuration is satisfied, the mechanical strength of the third region is increased, so that damage from impact due to contact during handling can be reduced, and corrosion resistance to alkaline components and molten aluminum is increased. be able to.
- the third area and the fourth area can be confirmed by the following method.
- the color mapping of aluminum using EPMA is observed for the second region 2.
- FIG. 1 (b) the color tone of the inner side and the outer side in the portion of 20% in the thickness direction from the outer peripheral surface is confirmed, and the color tone that is relatively warm is shown.
- the fourth region is the third region, which is indicated by a relatively cold color tone.
- FIG. 1 although the cylindrical body which has the bottom by which the one end was sealed was shown, it is not specified to this shape, and the cylindrical shape (rings, such as a ring, etc.) which are not sealed at both ends is also shown. Or a housing-like shape.
- Specific applications of the structure 10 made of the silicon nitride sintered body of the present embodiment include a burner tube, a radiant tube, a thermocouple protection tube, a ladle, a stalk, a degassing rotor, a seal ring, and a firing container. , Spherical or roller-like rolling elements, and the like.
- FIG. 2 is a longitudinal sectional view showing an example of a heat conduction device including the heat conduction member of the present embodiment.
- a heat conduction device 20 shown in FIG. 2 is used to heat a molten metal such as aluminum, and includes a heater 5 as a heat source and a silicon nitride-based sintered body for enclosing and protecting the heater 5.
- a heat conducting member 11 as a body 10 and a power source 6 for supplying power to the heater 5 are provided.
- the structure 10 satisfies the configuration described with reference to FIG. 1. In the configuration shown in FIG. 2, the structure 10 has a first region on the inner peripheral surface, that is, the heat source is the structure 10. Of the first region.
- the heat conduction device 20 is arranged such that at least a part of the structure 10 in the heat conduction member 11 is immersed in a molten metal (not shown), and the heater 5 is heated by the power supplied from the power source 6.
- the molten metal is heated through the body 10.
- the heat source is arrange
- the heat conducting member 11 can be used for heating purposes other than molten metal.
- the example of the heat conductive member 11 using the structure 10 was shown in FIG. 2, you may use the structure of the structure which contains aluminum in a grain boundary phase.
- metal silicon powder and silicon nitride powder having a ⁇ conversion ratio of 20% or less are prepared, and the mass ratio of (metal silicon powder) / (silicon nitride powder) is 1 or more and 10 or less. So as to obtain a first powder.
- the metal silicon powder is cumulative when the total volume of the particle size distribution curve is 100%.
- a particle size (D 90 ) with a volume of 90% is 10 ⁇ m or less, preferably 6 ⁇ m or less.
- a second powder obtained by weighing at least one of a sodium oxide powder and a potassium oxide powder, a magnesium aluminate powder, and a metal compound powder is obtained.
- the first powder and the second powder are, as a starting material, a powder weighed so that the second powder is 10% by mass to 23% by mass when the total of the first powder and the second powder is 100% by mass.
- the metal compound is aluminum oxide, silicon dioxide, calcium carbonate, or the like.
- a silicon nitride-based sintered body having a total of values converted to Na 2 O and K 2 O of 0.2% by mass or more and 1% by mass or less, respectively, in the increase in mass due to nitriding of metal silicon powder and in the firing step In consideration of evaporation, sodium oxide powder and / or potassium oxide powder may be weighed.
- the manufacturing method described here is to generate silicon nitride by nitriding using metal silicon powder, and the mass increase due to nitridation of metal silicon occurs.
- magnesium oxide powder is added and magnesium oxide is present in the silicon nitride sintered body, the mass of magnesium oxide out of 100% by mass of the starting material and the total mass of the silicon nitride sintered body The mass of magnesium oxide is not the same. Therefore, the magnesium aluminate powder and the metal compound powder are weighed in consideration of mass increase due to nitridation of metal silicon.
- the starting material is mixed and pulverized together with a solvent by a known method such as a barrel mill, a rotating mill, a vibration mill, a bead mill, a sand mill, an agitator mill or the like to obtain a slurry.
- a known method such as a barrel mill, a rotating mill, a vibration mill, a bead mill, a sand mill, an agitator mill or the like.
- pulverizing media used in such pulverization those composed of a silicon nitride sintered body, a zirconium oxide sintered body, an aluminum oxide sintered body, etc. can be used.
- a particle size ( D90 ) it is suitable to perform grinding
- the outer diameter, amount, grinding time, etc. of the grinding media may be adjusted.
- an organic binder such as paraffin wax, polyvinyl alcohol (PVA), polyethylene glycol (PEG) or the like is appropriately selected according to the molding method so that it is 1 to 10 parts by mass with respect to 100 parts by mass of the starting material.
- the moldability can be improved by weighing and mixing with the slurry.
- the surface layer is dotted with first compounds containing iron and silicon, and the number of first compounds having a circle-equivalent diameter of 0.05 ⁇ m or more and 5 ⁇ m or less is 2.0 ⁇ 10 4 or more and 2.0 ⁇ 10 2 per 1 mm 2.
- ferric oxide powder having a specific surface area of 0.5 m 2 / g or more and 50 m 2 / g or less is added to and mixed with the slurry. The amount of ferric oxide powder added is weighed so that the amount of ferric oxide powder is 1 to 1.7 parts by mass with respect to 100 parts by mass of the starting material.
- the surface layer is dotted with second compounds containing tungsten and silicon, and the number of second compounds having a circle-equivalent diameter of 0.05 ⁇ m or more and 5 ⁇ m or less is 2.0 ⁇ 10 4 or more and 2.0 ⁇ 10 5 per mm 2.
- a powder of tungsten oxide having a specific surface area of 0.5 m 2 / g or more and 50 m 2 / g or less is added to the slurry.
- the addition amount of the tungsten oxide powder is weighed so that the tungsten oxide powder is 0.6 mass% or more and 0.9 mass% or less with respect to 100 mass parts of the starting material.
- granulated granules are obtained using a spray dryer. Thereafter, the obtained granule is used for press molding or CIP molding (Cold Isostatic Pressing) or the like to obtain a molded product having a relative density of 45 to 60% and having a desired shape.
- press molding or CIP molding Cold Isostatic Pressing
- a molded body obtained in a carbon mortar whose surface is covered with silicon carbide or silicon nitride crystal particles is placed and degreased in a nitrogen atmosphere or in a vacuum.
- the degreasing temperature varies depending on the kind of the added organic binder, but is preferably 900 ° C. or less. In particular, it is preferably 450 ° C. or higher and 800 ° C. or lower.
- a product obtained by removing lipid components such as an organic binder from the molded body is called a degreased body.
- nitriding is performed by raising the temperature further from the temperature when degreasing. Note that nitriding is preferably performed after the first nitriding step by a second nitriding step having a temperature higher than that of the first nitriding step.
- the nitrogen partial pressure is set to 10 to 200 kPa and held at a temperature of 1000 to 1200 ° C. for 15 to 25 hours, so that 10 to 70% by mass of metallic silicon in the degreased body is obtained.
- the remaining portion of the metal silicon in the degreased body is nitrided to be a nitride by holding at a temperature between the temperature of the first nitriding step and 1400 ° C. for 5 to 15 hours.
- the temperature of the second nitriding step is higher than the temperature of the first nitriding step and not more than 1400 ° C., and it is preferable that the first nitriding step and the second nitriding step are performed continuously. is there.
- the temperature rise is continued, the firing temperature is set to 1700 ° C. or higher and 1860 ° C. or lower, the nitrogen pressure is maintained at, for example, 100 kPa or higher and 160 kPa or lower, and held for 6 to 14 hours. Cool at a rate of less than 230 ° C. In order to obtain a silicon nitride sintered body containing gehlenite in the grain boundary phase, it may be cooled at a rate of 190 ° C. or more and less than 210 ° C. per hour.
- silicon nitride sintered body in which magnesium and sodium are solid-dissolved in gehlenite it may be cooled at a rate of 170 ° C. or more and less than 190 ° C. per hour.
- magnesium oxide from the inner peripheral surface side when the molded body is placed on the mortar In order to suppress the volatilization, for example, a gas supply pipe may be disposed on the inner peripheral surface side of the molded body, and a nitriding step may be performed while supplying nitrogen, and the temperature may be further raised and fired.
- the inner peripheral surface side is the first region, and the outer peripheral surface side is the second region.
- a porous firing container is filled and disposed on the inner peripheral surface side of the molded body.
- the grain boundary phase contains an oxide of aluminum
- the second region has a relatively high value of the characteristic X-ray intensity of aluminum
- the value of the characteristic X-ray intensity of aluminum is relatively high.
- an oxidizing agent is used as an atmosphere adjusting agent. What is necessary is just to lay the powder which consists of at least any one of aluminum and aluminum nitride in the outer position which does not contact the molded object on the bottom plate of a mortar.
- a slurry obtained by mixing a powder composed of at least one of aluminum oxide and aluminum nitride and water, applying the slurry to the side wall, and drying the slurry may be used.
- the particle size of the atmosphere adjusting agent is, for example, the particle size specified in JIS R 6001-1998, considering that it is easy to handle and that high reactivity can be obtained by increasing the specific surface area. It is preferable to use powders that are F16 to F220.
- the silicon nitride sintered body obtained by the above-described manufacturing method may be subjected to processing such as polishing, blasting, cutting and drilling as necessary.
- a metal silicon powder and a silicon nitride powder having a ⁇ conversion ratio of 10% were prepared, and the mass of (metal silicon powder) / (silicon nitride powder)
- the first powder was obtained by weighing and mixing so that the ratio was 5.4.
- the metal silicon powder having a particle size (D 90 ) of 5 ⁇ m was used.
- each powder was weighed as the second powder.
- the total amount of the second powder was the mass shown in Table 1, and the remainder was weighed so as to be the first powder, and these were used as starting materials.
- the starting material was put in a barrel mill together with a grinding medium composed of water and a silicon nitride sintered body, and mixed and pulverized until the particle size (D 90 ) became 1 ⁇ m or less to obtain a slurry.
- PVA polyvinyl alcohol
- the molded body was placed in a mortar made of a silicon carbide sintered body and degreased by holding at 500 ° C. for 5 hours in a nitrogen atmosphere. Subsequently, the temperature was further raised, and nitriding was carried out in a nitrogen partial pressure of 150 kPa consisting essentially of nitrogen by successively holding at 1050 ° C. for 20 hours and at 1250 ° C. for 10 hours. Then, the temperature was further raised, and the pressure of nitrogen was set to 100 kPa, and the mixture was held at 1730 ° C. for 12 hours for firing. Thereafter, by cooling at a rate of 180 ° C. per hour, 1 to 38 silicon nitride sintered bodies were obtained.
- Each sample was identified by measurement by XRD, and it had silicon nitride crystals. Furthermore, sample no.
- the silicon content in 1 to 38 was measured with a nitrogen analyzer and the nitrogen content in the silicon nitride sintered body was converted to Si 3 N 4 from the nitrogen content.
- the silicon nitride content was 80% by mass or more.
- the amount of mass reduction per unit area is shown in Table 2 by comparing the mass after each sample was immersed in a 30% by mass sodium hydroxide solution at 90 ° C. for 100 hours with the mass before immersion. Indicated.
- the thermal diffusivity ⁇ in the thickness direction of each sample was measured by a two-dimensional method using a laser flash using a thermal constant measuring device (TC-7000, manufactured by ULVAC-RIKO).
- the specific heat capacity C of each sample was measured by a suggested scanning calorimetry (DSC method) using an ultrasensitive differential scanning calorimeter (DSC-6200, manufactured by Seiko Instruments Inc.).
- the bulk density ⁇ (kg / m 3 ) of each sample was measured according to JIS R 1634-1998. Then, the values obtained by these methods are substituted into the following formula (1) to calculate the thermal conductivity ⁇ (W / (m ⁇ K)) in the thickness direction of each sample, and the values are shown in Table 1. It was shown in 2.
- ⁇ ⁇ ⁇ C ⁇ ⁇ ⁇ ⁇ ⁇ (1)
- the mechanical strength of each sample four-point bending strength was measured according to JIS R 1601-2008, and the measured values are shown in Table 2.
- the converted value shown in Table 2 is described as content.
- Table 2 when sample Nos. 1, 2 , 9 and 16 to 18 having the same content of CaO, MgO and Al 2 O 3 and different contents of Na 2 O are compared, the content of Na 2 O However, the sample No. is 0.2 mass% or more and 1 mass% or less of the total mass. 2, 9, 16 and 17 have a mass reduction per unit area of 0.29 mg / cm 2 or less, a thermal conductivity of 21 W / (m ⁇ K) or more, high corrosion resistance against alkali components and high heat It was found that it also has conductivity.
- the sample No. total content of Na 2 O and K 2 O is at most 1 mass% 0.2 mass% or more of the total weight 37 and 38 were also found to have both high corrosion resistance against alkali components and high thermal conductivity.
- sample Nos. 2 having the same contents of Na 2 O, MgO and Al 2 O 3 and different contents of CaO were used.
- 6, 9 and 12 have a mass loss per unit area of 0.24 mg / cm 2 or less, a thermal conductivity of 24 W / (m ⁇ K) or more, a four-point bending strength of 740 MPa or more, an alkali It was found that both high corrosion resistance to the components and high thermal conductivity were obtained, and the mechanical properties were high and good.
- the sample Nos. 2 having the same contents of K 2 O, MgO and Al 2 O 3 and different contents of CaO. Comparing 23, 24, 27, 30 and 31, the sample No. 2 contained CaO in the total mass of 2.2 mass% or more and 5.2 mass% or less. 24, 27 and 30 have a mass loss per unit area of 0.24 mg / cm 2 or less, a thermal conductivity of 23 W / (m ⁇ K) or more, a four-point bending strength of 740 MPa or more, an alkali It was found that both high corrosion resistance to the components and high thermal conductivity were obtained, and the mechanical properties were high and good.
- sample Nos. 2 having the same contents of Na 2 O, CaO and Al 2 O 3 but different contents of MgO were used. When comparing 3, 4, 9, 14 and 15, sample no. It was found that the characteristics of 4, 9 and 14 were good. Furthermore, the sample Nos. 2 in which the contents of K 2 O, CaO and Al 2 O 3 are the same and the contents of MgO are different. Comparing 21, 22, 27, 32 and 33, sample no. The characteristics of 22, 27 and 32 were found to be good.
- sample Nos. 2 having the same contents of Na 2 O, CaO and MgO but different contents of Al 2 O 3 .
- sample no. It was found that the characteristics of 8 to 10 were good.
- sample Nos. 25 to 29 having the same contents of K 2 O, CaO and MgO but different contents of Al 2 O 3 are compared, It was found that the characteristics of 26 to 28 were good.
- a first powder was prepared in the same manner as in Example 1.
- sodium oxide powder, calcium carbonate powder, magnesium aluminate powder and aluminum oxide powder are prepared as the second powder.
- the first powder is 78.8% by mass
- the sodium oxide powder is 3.6% by mass
- the calcium powder was 11.3% by mass
- the magnesium aluminate powder was 2.6% by mass
- the aluminum oxide powder was 3.7% by mass.
- ferric oxide powder having a specific surface area as shown in Table 3 was weighed so as to be 1.4 parts by mass with respect to 100 parts by mass of the starting material, and added to the slurry.
- the other methods up to the production of the molded body were the same as in Example 1.
- the nitriding step was carried out in the same manner as in Example 1, and the firing was carried out while maintaining the nitrogen pressure at the value shown in Table 3 at 1775 ° C. for 12 hours. Thereafter, by cooling at a rate of 225 ° C. per hour, 39 to 50 silicon nitride sintered bodies were obtained.
- the range was set so that the area was 10.8 ⁇ 10 4 ⁇ m 2 (the length in the horizontal direction was 127 ⁇ m and the length in the vertical direction was 85.3 ⁇ m) with a magnification of 1000 using a scanning electron microscope. Then, a reflected electron image in this range is captured with a CCD camera, and silicidation with a circle equivalent diameter of 0.05 ⁇ m or more and 5 ⁇ m or less on the surface layer is performed using image analysis software “A Image-kun” (registered trademark, manufactured by Asahi Kasei Engineering Corp.). The number of iron was determined by particle analysis.
- the threshold value is an index indicating the brightness of the reflected electron image
- each point (each pixel) in the reflected electron image is It was set to 1.6 times the peak value of the histogram indicating brightness.
- Table 3 shows the number per 1 mm 2 of the first compound having an equivalent circle diameter of 0.05 ⁇ m or more and 5 ⁇ m or less in the surface layer.
- a thermal shock test of the sample was performed. Specifically, a test piece having a thickness of 3 mm, an axial direction of 40 mm, and a vertical direction of 4 mm from the outer peripheral side of each sample was cut out, held at 800 ° C., and dropped into 20 ° C. water. The presence or absence of cracks in the surface layer of the test piece after dropping was visually observed. In addition, a test piece of the same size was cut out and the same test was performed at a holding temperature of 900 ° C. The results are shown in Table 3.
- Example 2 Except that the powder to be added to the slurry was changed to ferric oxide powder to obtain tungsten oxide powder, the same procedure as in Example 2 was followed until the nitriding step, and the nitrogen pressure was 1775 as shown in Table 4. Baked at 12 ° C. for 12 hours. Thereafter, by cooling at a rate of 225 ° C. per hour, 51 to 62 silicon nitride sintered bodies were obtained.
- the number per 1 mm 2 of the second compound having an equivalent circle diameter of 0.05 ⁇ m or more and 5 ⁇ m or less on the surface layer was determined in the same manner as in Example 2. Only the peak value of the histogram was set to 1.7 times. The results are shown in Table 4.
- test pieces according to JIS R 1601-2008 were cut out from each sample, and the 4-point bending strength at room temperature was measured.
- a color difference meter Konica Minolta Holdings, Inc. CM-3700A
- the light source was set to CIE standard light source D65
- the viewing angle was set to 10 °
- the measurement range was set to 3 mm ⁇ 5 mm
- JIS Z 8722- The color tone of the surface of each sample was measured according to 2000, and the measured values of the brightness index L * and chromaticness index a * , b * are shown in Table 4.
- Sample No. Nos. 52 to 61 are dotted with second compounds containing tungsten and silicon in the surface layer, and the number of second compounds having an equivalent circle diameter of 0.05 ⁇ m or more and 5 ⁇ m or less is 2.0 ⁇ 10 4 or more per 1 mm 2. by ⁇ 10 5 or less, the value of the lightness index L * is small, the surface of the silicon nitride sintered body has the shape of a color having low lightness, with color unevenness is less likely to occur, a high mechanical strength Therefore, it was found that the occurrence of cracks can be suppressed even when mechanical stress is applied.
- Sample No. Sample No. 6 63 was produced.
- a gas supply pipe was arranged, and while supplying nitrogen from the gas supply pipe, Sample No. 64 silicon nitride sintered bodies were produced.
- Sample No. No. 64 is a sample No. 64 for the composition and production method other than the different conditions when the molded body is positioned in the mortar. Same as 63.
- sample no. The size of the characteristic X-ray intensity value was confirmed by the color tone by color mapping of magnesium using EPMA for the 63 and 64 cross sections. As a result, sample no. For No. 63, there was no difference in the value of the characteristic X-ray intensity of magnesium. About 64, it had the 1st field on the inner skin side, and the 2nd field on the outer skin side.
- each heater After each heater is placed on the inner peripheral surface of each sample, it is immersed in a container containing 10 liters of water at a temperature of 5 ° C., and the time until the water reaches 100 ° C. is heated. It was measured. As a result, sample no. In 64, the time until water reached 100 ° C was faster.
- the heat of the heat source can be efficiently transmitted by the first region being located on the heat source side, that is, the first region is exposed.
- sample no. Sample no. 65 was produced.
- aluminum oxide powder having a particle size of F16 as defined in JIS R 6001-1998 is used as an atmosphere adjusting agent.
- Aluminum oxide powder having a particle size of F16 as defined in JIS R 6001-1998 is used as an atmosphere adjusting agent.
- Aluminum oxide powder having a particle size of F16 as defined in JIS R 6001-1998 is used as an atmosphere adjusting agent.
- 66 silicon nitride sintered bodies were produced.
- Sample No. No. 66 is the same as that of Sample No. Same as 65.
- sample no. for 65 and 66 cross sections the value of the characteristic X-ray intensity was confirmed by color tone by aluminum color mapping using EPMA.
- sample no. For No. 65 no difference was found in the value of the characteristic X-ray intensity of aluminum, and it did not have the third region and the fourth region.
- about 66 it had the 3rd field on the perimeter side in the 2nd field, and had the 4th field on the inner skin side in the 2nd field.
- sample no. A test piece according to JIS R 1601-2008 was cut out from the third area of 66.
- Sample No. 65, sample no. A test piece was cut out from the same position as the third region of 66. Then, in the same manner as in Example 1, the four-point bending strength of the sample pieces of sample Nos. 65 and 66 was measured.
- sample No. 66 had a higher 4-point bending strength. From this, it was found that since the third region is exposed, the mechanical strength is high, so that damage from impact due to contact during handling can be reduced.
- First area 2 First area 2: Second area 10: Structure 11: Heat conduction member 20: Heat conduction device
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Abstract
Description
κ=α・C・ρ・・・(1)
また、各試料の機械的強度については、JIS R 1601-2008に準拠して4点曲げ強度を測定し、その測定値を表2に示した。
2:第2の領域
10:構造体
11:熱伝導部材
20:熱伝導装置
Claims (10)
- 窒化珪素の結晶と、ナトリウムの酸化物およびカリウムの酸化物の少なくともいずれかを含む粒界相とを有し、前記ナトリウムの酸化物および前記カリウムの酸化物の含有量が、全質量のうちそれぞれNa2O,K2Oに換算した値の合計で0.2質量%以上1質量%以下であることを特徴とする窒化珪素質焼結体。
- 前記粒界相に、カルシウムの酸化物を含み、該カルシウムの酸化物の含有量が、全質量のうちCaOに換算した値で2.2質量%以上5.2質量%以下であることを特徴とする請求項1に記載の窒化珪素質焼結体。
- 前記粒界相に、マグネシウムの酸化物を含み、該マグネシウムの酸化物の含有量が、全質量のうちMgOに換算した値で0.1質量%以上0.6質量%以下であることを特徴とする請求項1または請求項2に記載の窒化珪素質焼結体。
- 前記粒界相に、アルミニウムの酸化物を含み、該アルミニウムの酸化物の含有量が、全質量のうちAl2O3に換算した値で5.3質量%以上8.6質量%以下であることを特徴とする請求項1乃至請求項3のいずれかに記載の窒化珪素質焼結体。
- 前記粒界相に、ゲーレナイトを含むことを特徴とする請求項4に記載の窒化珪素質焼結体。
- 表層において、鉄および珪素を含む第1の化合物が点在し、円相当径が0.05μm以上5μm以下の前記第1の化合物の個数が、1mm2当たり2.0×104個以上2.0×105個以下であることを特徴とする請求項1乃至請求項5のいずれかに記載の窒化珪素質焼結体。
- 表層において、タングステンおよび珪素を含む第2の化合物が点在し、円相当径が0.05μm以上5μm以下の前記第2の化合物の個数が、1mm2当たり2.0×104個以上2.0×105個以下であることを特徴とする請求項1乃至請求項6のいずれかに記載の窒化珪素質焼結体。
- 前記粒界相に、マグネシウムの酸化物を含み、該マグネシウムの特性X線強度の値が相対的に大きい第1の領域と、前記マグネシウムの特性X線強度の値が相対的に小さい第2の領域とを備え、少なくとも前記第1の領域が露出していることを特徴とする請求項1に記載の窒化珪素質焼結体。
- 前記粒界相に、アルミニウムの酸化物を含み、前記第2の領域が、前記アルミニウムの特性X線強度の値が相対的に多い第3の領域と、前記アルミニウムの特性X線強度の値が相対的に少ない第4の領域とを備え、前記第3の領域が露出していることを特徴とする請求項8に記載の窒化珪素質焼結体。
- 請求項8または請求項9に記載の窒化珪素質焼結体と、熱源とを備え、前記第1の領域側に熱源を配置してなることを特徴とする熱伝導部材。
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JP2014529592A JP5944996B2 (ja) | 2012-08-10 | 2013-08-12 | 窒化珪素質焼結体および熱伝導部材 |
EP13827569.8A EP2883854A4 (en) | 2012-08-10 | 2013-08-12 | SINTERED SILICON NITRIDE PRESSING AND HEATING ELEMENT |
CN201380038715.XA CN104470872A (zh) | 2012-08-10 | 2013-08-12 | 氮化硅质烧结体及导热构件 |
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JPWO2014025062A1 (ja) | 2016-07-25 |
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EP2883854A1 (en) | 2015-06-17 |
CN104470872A (zh) | 2015-03-25 |
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