CN1527343A - Light-transmission aluminium oxide ceramics and producing method thereof, luminous container granulating powder and forming body for high-voltage discharge lamp - Google Patents
Light-transmission aluminium oxide ceramics and producing method thereof, luminous container granulating powder and forming body for high-voltage discharge lamp Download PDFInfo
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- CN1527343A CN1527343A CNA2004100079359A CN200410007935A CN1527343A CN 1527343 A CN1527343 A CN 1527343A CN A2004100079359 A CNA2004100079359 A CN A2004100079359A CN 200410007935 A CN200410007935 A CN 200410007935A CN 1527343 A CN1527343 A CN 1527343A
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Abstract
To keep the total light transmittance and linear transmittance of a translucent alumina ceramic high, and to reduce the dispersion in the transmittance. In order to manufacture the translucent alumina ceramic, a granulated powder is prepared by granulating an alumina raw material powder and a binder with a spray dryer, forming the granulated powder into a formed body, and firing the formed body. The alumina raw material powder is produced from aluminum sulfate. The granulated powder has an average fine pore diameter of 0.5 to 2.0 [mu]m.
Description
Technical field
The present invention relates to manufacture method, light transmitant aluminium oxide ceramic, liminous container for high-voltage discharge lamp, prilling powder and the formed body of light transmitant aluminium oxide ceramic.
Background technology
In the liminous container for high-voltage discharge lamp of patent documentation 1 (spy opens flat 10-125230 communique) record, make the formed body of tubular body and the formed body of annular end seal member respectively, assembly is made in these two kinds of formed body assemblings.And, this assembly sintering is made encapsulating light emitting material container.At this moment, the internal diameter of the profile when making the formed body of independent sintering end seal parts during than the formed body of independent sintering tubular body is big, has designed the sintering shrinkage of the two in advance.Therefore, when sintering,,, can keep the height air-tightness so the joint of the two is good owing to apply pressure force to the end seal parts from tubular body.
This material must have corrosion resistance to luminescent substance, in view of this point is used light transmitant aluminium oxide ceramic mostly.When making light transmitant aluminium oxide ceramic, the alumina raw material powder is mixed with binding agent, obtain prilling powder, prilling powder is formed tubular with the spray dryer granulation, and this formed body of sintering.
In the process that the inventor studies, because of the difference of creating conditions, whole light penetrations of light transmitant aluminium oxide ceramic and straight line transmitance reduce, and can produce scattering.This becomes the low reason of fabrication yield.
Summary of the invention
The objective of the invention is to make whole light penetrations of light transmitant aluminium oxide ceramic and straight line transmitance to remain on the high level, thereby can reduce its scattering.
The present invention relates to a kind of manufacture method of light transmitant aluminium oxide ceramic, this method obtains prilling powder by using spray drying process with alumina raw material powder and binding agent granulation, this prilling powder obtains formed body by being shaped, this formed body of sintering is made light transmitant aluminium oxide ceramic, it is characterized in that, above-mentioned alumina raw material powder aluminum sulfate manufacturing, the average micropore size of this prilling powder are 0.5～2.0 μ m.
And, the invention still further relates to a kind of light transmitant aluminium oxide ceramic, it is characterized in that utilizing said method to obtain.
In addition, the present invention relates to the luminous containers of a kind of high-pressure discharge lamp with ceramic making, this luminous containers has tubular body that forms discharge space and the end seal parts that seal this tubular body end, it is characterized in that above-mentioned tubular body forms with the described light transmitant aluminium oxide ceramic of claim 2.
The invention still further relates to a kind of prilling powder, this prilling powder is to form the prilling powder that light transmitant aluminium oxide ceramic uses, it is characterized in that, above-mentioned prilling powder is the prilling powder that utilizes spray dryer that alumina raw material powder and binding agent granulation are obtained, above-mentioned alumina raw material powder aluminum sulfate manufacturing, the average micropore size of above-mentioned prilling powder are 0.5～2.0 μ m.
The invention still further relates to a kind of formed body, this formed body is to make the formed body that light transmitant aluminium oxide ceramic uses, it is characterized in that, above-mentioned formed body is the formed body that utilizes the prilling powder that spray dryer obtains alumina raw material powder and binding agent granulation, above-mentioned alumina raw material powder aluminum sulfate manufacturing, the average micropore size of this prilling powder are 0.5～2.0 μ m.
The inventor forms the alumina raw material powder of prilling powder by the aluminum sulfate manufacturing when making light transmitant aluminium oxide ceramic, the average micropore size that makes prilling powder simultaneously is at 0.5～2.0 μ m.Consequent action effect below is described.
Be that metallic aluminium is obtained alumina powder as raw material in the past, with spray dryer with this alumina raw material powder granulation.As shown in Figure 2, make the metallic aluminium reaction obtain alkyl aluminum, again alkyl aluminum hydrolysis is obtained aluminium hydroxide.Calcinations of aluminum hydroxide obtains calcined material, pulverizes calcined material and obtains the alumina raw material powder.Then, with alumina raw material powder and other additives mixed,, the granulation thing is shaped and sintering by spray drying granulation.
At this, to make in the stage of alumina raw material powder in calcinations of aluminum hydroxide, material powder condenses easily.Therefore, for example adopt injector-type mill that condensation product is fully pulverized, obtain the prilling powder that average grain diameter is little, apparent density is high.This prilling powder moisture content when drying is discharged the easy residual cavity in the centre afterwards, and the cavity can subside during cooling.The prilling powder of this form is difficult to disintegration when being shaped, therefore, contain bubble easily in formed body.And above-mentioned prilling powder is fully pulverized, the powder activity height.Therefore, the initial stage sintering carries out soon, carries out sintering easily under the condition that produces bubble when sintering.The result finds out that the straight line transmitance of sintered body reduces easily.In addition,, become insufficient easily, make sintered body present some black easily from the prilling powder skin decarburization because the initial stage sintering carries out soon.Thereby all light penetration reduces.
Given this, the alumina raw material powder is by the aluminum sulfate manufacturing among the present invention, and the average micropore size of prilling powder is 0.5～2.0 μ m.
That is, as shown in Figure 1, behind the synthetic aluminum sulfate, the spray dryer drying is used in centrifugation again, then powder is pulverized the calcining comminuted powder.The sinter that pulverizing obtains obtains the alumina raw material powder.In this alumina raw material powder, add additives mixed, obtain prilling powder, again with prilling powder shaping, sintering with the spray dryer granulation.Can obtain the light transmitant aluminium oxide ceramic powder like this.
The alumina raw material powder that obtains in the above described manner has easy-sintering.And, can be so that the micropore size of the prilling powder that arrives suitably becomes big, like this, moisture content is difficult in residual cavity, centre after discharging when dry.Therefore, cavity, cooling back is difficult to subside, can be with the shape maintains of prilling powder in the shape of subglobular relatively.Therefore easy disintegration when the prilling powder of this shape is shaped is difficult to comprise bubble in formed body.And, the initial stage sintering to carry out speed moderate, bubble is discharged easily during sintering.The result makes the straight line transmitance of sintered body maintain on the high level easily, can suppress scattering.In addition and since the initial stage sintering to carry out speed moderate, so abundant from the prilling powder skin decarburization, can prevent that whole light penetrations of sintered body from reducing.
The alumina raw material powder with aluminum sulfate as raw material.This method is called the ammonium alum method.At this moment, drying preferably utilizes spray drying process to carry out, and pulverizes and preferably carries out with roll grinding machine.Sintering temperature is not particularly limited, and for example can be set in 1100～1300 ℃.
Be not particularly limited for the binding agent that mixes with the alumina raw material powder, for example can list polyvinyl alcohol, polyvinyl acetal, polyglycereol, polyethylene glycol etc.
When alumina raw material powder amount was decided to be 100 weight portions, the consumption of binding agent is restriction not, but equals 1.0 weight portions in order to make formed body have suitable viscosity and intensity, to be preferably greater than, more preferably greater than equaling 1.5 weight portions.And from the viewpoint of release property and decarburization, the binding agent consumption is preferably smaller or equal to 4.0 weight portions.
Carry out granulation with spray dryer among the present invention.There is no particular restriction for the granulation condition, for example can adopt following granulation condition:
Sprayer revolution: 20000rpm
Hot air temperature: 200 ℃
In the mixed processes that in the alumina raw material powder, adds other metal oxides and mix, preferably water soluble metallic compound and water are mixed with the alumina raw material powder.Mixed method is restriction not, for example alumina raw material powder and water soluble metallic compound and water is added in the cylinder, mixes while pulverizing.
Can be listed below as such water soluble metallic compound: magnesium nitrate, yttrium nitrate, lanthanum nitrate, basic zirconium chloride.
The average micropore size of prilling powder of the present invention is 0.5～2.0 μ m.By making it more than or equal to 0.5 μ m, can make prilling powder have suitable micropore, the formation in cavity and when cooling powder surface subsides in the time of can suppressing granulation.From this viewpoint, the average micropore size of prilling powder is more preferably greater than equaling 1.0 μ m.In addition, if surpass 2.0 μ m, just in formed body, import bubble easily.
The average micropore size of prilling powder is measured as follows: taken pictures in the prilling powder surface with 2500 times with scanning electron microscopy, be determined at the arbitrary region 1cm that is in 115 * 90mm photo visual field under the mean state
2Interior average micropore size.Measure average micropore size everywhere at other equally, obtain its mean value, as average micropore size.
Though there is no particular restriction for the manufacturing process of prilling powder, preferred press molding method.Preferred 800～the 2000kg/cm of forming pressure
2
The intensity of formed body is preferably greater than and equals 700g.Formed body intensity height means the disintegration that can promote prilling powder in the forming process well.By this viewpoint, formed body intensity is more preferably greater than equaling 850g.
This formed body strength detection is as follows: at 1500kg/cm
2Pressure is shaped down, from radially to the cylindrical shape formed body pressurization of external diameter φ 11 * wall thickness 0.9 * length 25mm, measures the maximum pressure when formed body destroys.
In addition, the viscosity of formed body is preferably greater than and equals 0.8 second.Formed body viscosity height means the disintegration that can promote prilling powder in the forming process well.By this viewpoint, formed body viscosity is more preferably greater than equaling 1.0 seconds.
The viscosimetric analysis of formed body is as follows: at 1500kg/cm
2Pressure is shaped down, from radially to the cylindrical shape formed body pressurization of external diameter φ 11 * wall thickness 0.9 * length 25mm, measures the time that reaches maximum pressure.
Bubbles volume in the light transmitant aluminium oxide ceramic of the present invention, more much lower than existing bubbles volume.Bubbles volume is preferably smaller or equal to 9.Wherein bubbles volume mensuration is as follows, promptly takes optical microscope photograph (multiple is 100 times), then, and visual field size 90 * 65mm (59mm in the counting photo
2) in the scope bubble diameter more than or equal to the bubbles number of 3 μ m.Fig. 3 is the microscope photograph of the prilling powder relevant with example of the present invention, and Fig. 4 is the microphotograph of the prilling powder of comparative example.Among each figure, the stain of granule boundary is a bubble.
Below be used for liminous container for high-voltage discharge lamp with regard to the present invention example describe.
Fig. 5 is the sectional view of expression liminous container for high-voltage discharge lamp 1, and Fig. 6 represents electrod assembly 22 is fixed on the high-pressure discharge lamp 10 that obtains on the container 1.
Manufacture process according to container describes below.As shown in Figure 7, prepare the body to be sintered 13 of end seal parts and the body to be sintered 11 of tubular body.Body to be sintered can be formed body, degreasing body or the calcined body before the sintering.Body 13 to be sintered has the annulus 13b that is body part 13a cylindraceous substantially and is arranged on body part 13a end.In body 13 to be sintered, form through hole 13c.13d is a lateral surface.In the body to be sintered 11 of tubular body, form space 12.
The body part 13a of body 13 to be sintered is inserted in the opening of end 11a of body to be sintered 11 of tubular body, make assembly 20.With assembly 20 sintering, make container 1 shown in Figure 5.
In sintering circuit, the internal diameter in the time of should making the independent sintering of the formed body of tubular body, the external diameter during than the independent sintering of formed body of end seal parts is little.Like this, when sintering, by tubular body the end seal member is exerted pressure, the two firmly is crimped on together, has improved air-tightness.By this viewpoint, the external diameter RO during the independent sintering of the formed body of end seal parts, the ratio (RO/RI) of the internal diameter RI during with the independent sintering of formed body of tubular body is preferably greater than and equals 1.04, more preferably greater than equaling 1.06.But if this ratio (RO/RI) is excessive, because the bonding part is easy to generate crackle, so,, be more preferably less than and equal 1.04 (RO/RI) preferably smaller or equal to 0.08 from suppressing the viewpoint that the bonding part cracks.
Behind the sintering, make shapes of containers 1 shown in Figure 5.Container 1 is made of tubular body 2 and end seal parts 4.In sintering process, though body to be sintered 11 and 13 shown in Figure 7 jointly along radial contraction, this moment body 11 to be sintered contraction big.The external diameter of tubular body 2 middle body 2a equates substantially with sintered body external diameter under the body 11 independent sintering situations to be sintered.But on the contact portion of end seal parts 4 and tubular body 2, the contraction of tubular body 2 is suppressed.Consequently, be in the external diameter of the hermetic unit 2c of tubular body 2 ends, bigger than the external diameter of middle body 2a.And, between middle body 2a and hermetic unit 2c, will produce the mid portion 2b of external diameter smooth variation.
In the container 1 that obtains, the medial surface 2e of tubular body 2 is towards discharge space 3.End seal parts 4 have body part 4a and annulus 4b.The body part 4a of end seal parts 4 is inserted in tubular body 2 open-ended, it is bonded together.As shown in Figure 6, electrod assembly 22 is inserted and secured among the electrod assembly patchhole 4c of end seal parts 4.Electrode is accommodated in the discharge space 3.Utilize grafting material between the lateral surface of the medial surface of end seal parts 4 and electrod assembly 22, for example frit 8 sealings.
There is no particular restriction for the material of electrode material and shape.Preferred refractory metal of the material of electrod assembly and conductivity ceramics.The metal of one or more that preferably from molybdenum, tungsten, rhenium, hafnium, niobium and tantalum, select as refractory metal, or contain the alloy of this metal.
There is no particular restriction for the kind of grafting material, but preferred so-called sintered glass (Off リ Star ト ガ ラ ス), preferred especially Al
2O
3-CaO-Y
2O
3-SrO is the glass of compositional system.
Description of drawings
Fig. 1 is the figure of the preferred embodiment of expression light transmitant aluminium oxide ceramic manufacturing process of the present invention;
Fig. 2 is the figure of the light transmitant aluminium oxide ceramic manufacturing process of expression reference example;
Fig. 3 is the microphotograph of the light transmitant aluminium oxide ceramic of the embodiment of the invention;
Fig. 4 is the microphotograph of the light transmitant aluminium oxide ceramic of reference example;
Fig. 5 is the sectional view of wanting portion of expression liminous container for high-voltage discharge lamp 1;
Fig. 6 is the sectional view that expression is fixed on electrod assembly 22 high-pressure discharge lamp 10 that obtains on the container of Fig. 5;
Fig. 7 is the formed body 11 of expression tubular body and the sectional view of the assembly 20 of the formed body 13 of end seal parts.
Symbol description
1, container 2, tubular body 3, discharge space 4, end seal parts
8, cement 10, high-pressure discharge lamp 22, electrod assembly.
Embodiment
Embodiment 1
With reference to accompanying drawing 1,, make the cylinder of forming by light transmitant aluminium oxide ceramic according to the order of its explanation.At first with the synthetic ammonium sulfate of aluminum sulfate, centrifugation then, again with spray dryer with powder for drying.With roll grinding machine dried powder is pulverized,, obtained alpha-alumina powder at 1100～1300 ℃ of sintering temperature comminuted powders.With roll grinding machine it is pulverized, obtain the alumina raw material powder.
Then, in alumina raw material powder (purity is more than or equal to 99.9%), add 150ppm magnesium oxide, 400ppm zirconia, 30ppm yittrium oxide, 2 weight % polyvinyl alcohol, 0.5 weight % polyethylene glycol and 50 weight parts waters, pulverized 15 hours with ball mill, mix.With spray dryer about 200 ℃ with mixture drying and granulation, obtained the about 80 μ m of average grain diameter, apparent density is 0.75g/cm
3Prilling powder.Make five groups of samples, the mean value of micropore size is 1.0 μ m.
With this prilling powder at 2000kg/cm
2Press molding under the pressure is made cylindric formed body.The intensity average out to 950g of this formed body, viscosity average out to 1.7 seconds.
At the highest 1800 ℃ of these formed bodies of following sintering, make the cylindric sample of forming by light transmitant aluminium oxide ceramic.The external diameter of this sample is 9mm, and internal diameter is 7.5mm.Observe this sintered body down with light microscope for 100 times at multiple.The result is presented among Fig. 3.The stain that can see with granule boundary in particle is a bubble.The number of bubble is at every 59mm
2Average out to is 5 within sweep of the eye.
The straight line transmitance of this sample is 4.5%, and all light penetration is 98.3%.
Embodiment 2
Form prilling powder similarly to Example 1, obtained the formed body of tubulose formed body and end seal parts.External diameter RO during the independent sintering of the formed body of end seal parts 4, the ratio (RO/RI) of the internal diameter RI during with the independent sintering of formed body of tubulose formed body 2 is decided to be 1.04.
And then, make its dimensional contraction at the formed body that 1200 ℃ of temperature lower calcination end seal parts are used.The end that calcined body 13 is inserted formed body 11 obtains assembly 20 as shown in Figure 7.At 1200 ℃ of temperature lower calcination assemblies 20, tubular body is shunk with formed body 11, pressurize with calcined body to the end seal parts from formed body 11.Then, at 1800 ℃ of sintering temperatures, the end seal parts are engaged securely with tubular body.
Then niobium system electrod assembly 22 is inserted in the electrod assembly patchhole 4c, engage with grafting material 8.As grafting material 8, using Al-Ca-Y-Sr is sintered glass.Its composition is decided to be: 45 weight %Al
2O
3, 40 weight %CaO, 5 weight %Y
2O
3, 10 weight %SrO.The glass fusing point is 1370 ℃ ± 10 ℃.Maximum temperature is 1440 ℃, engages under 2 minutes maximum temperature retention times condition.
Comparative example 1
With reference to Fig. 2,, make the cylinder of forming by the infiltration type aluminium oxide ceramics according to the order of its explanation.With laminar metallic aluminium synthesis of alkyl aluminium, obtain aluminium hydroxide after the hydrolysis.Calcine this powder down at 1100～1300 ℃, obtain Alpha-alumina.With injector-type mill it is pulverized, obtained the alumina raw material powder.Utilize pulverizer (ダ イ ノ ミ Le) that this alumina raw material powder (purity is more than or equal to 99.9%) is mixed, then additive package.At this moment, use the cobble of forming through the zirconia of yttria-stabilized,, in slurry, add 15～17ppm yittrium oxide and 260ppm zirconia through wearing and tearing.And, by further interpolation zirconium chloride, make zirconia conversion addition reach 400ppm, add magnesium oxide 200ppm in addition.To wherein adding 2 weight % polyvinyl alcohol, 0.5 weight % polyethylene glycol and 50 weight parts waters, spray-dried machine drying of mixture and granulation obtain the about 95 μ m of average grain diameter, apparent density is 0.83g/cm
3Prilling powder.The micropore size mean value of prilling powder is 0.2 μ m.
With this prilling powder at 2000kg/cm
2Press molding under the pressure is made cylindric formed body.The intensity average out to 800g of this formed body, viscosity average out to 1.3 seconds.
At the highest 1800 ℃ of these formed bodies of sintering temperature, make the cylindric sample of forming by light transmitant aluminium oxide ceramic.The external diameter of this sample is 9mm, and internal diameter is 7.5mm.Observe this sintered body down with light microscope for 100 times at multiple.The result is presented among Fig. 4.The stain of seeing with granule boundary in particle is a bubble.The number of bubble is at every 59mm
2Average out to is 14 within sweep of the eye.
The straight line transmitance of this sample is 3.4%, and all light penetration is 97.2%.
Embodiment 3
Obtain light transmitant aluminium oxide ceramic similarly to Example 1.But the micropore size mean value of prilling powder is 0.5 μ m.And the number of bubble, at every 59mm
2Average out to is 9 within sweep of the eye.The straight line transmitance of light transmitant aluminium oxide ceramic sample is 4.1%, and all light penetration is 98.0%.
In sum, according to the present invention, whole light penetrations of light transmitant aluminium oxide ceramic and straight line transmitance all remain on the high level, can reduce its scattering.
Claims (5)
1. the manufacture method of a light transmitant aluminium oxide ceramic, this method obtains prilling powder by using spray drying process with alumina raw material powder and binding agent granulation, this prilling powder obtains formed body by being shaped, this formed body of sintering is made light transmitant aluminium oxide ceramic, it is characterized in that, above-mentioned alumina raw material powder aluminum sulfate manufacturing, the average micropore size of this prilling powder are 0.5～2.0 μ m.
2. a light transmitant aluminium oxide ceramic is characterized in that, this aluminium oxide ceramics utilizes the described method of claim 1 to make.
3. high-pressure discharge lamp ceramic luminous containers, this luminous containers has tubular body that forms discharge space and the end seal parts that seal this tubular body end, it is characterized in that above-mentioned tubular body forms with the described light transmitant aluminium oxide ceramic of claim 2.
4. prilling powder, this prilling powder is to form the prilling powder that light transmitant aluminium oxide ceramic uses, it is characterized in that, above-mentioned prilling powder is the prilling powder that utilizes spray dryer that alumina raw material powder and binding agent granulation are obtained, above-mentioned alumina raw material powder aluminum sulfate manufacturing, the average micropore size of above-mentioned prilling powder are 0.5～2.0 μ m.
5. formed body, this formed body is to make the formed body that light transmitant aluminium oxide ceramic uses, it is characterized in that, above-mentioned formed body is the formed body that utilizes the prilling powder that spray dryer obtains alumina raw material powder and binding agent granulation, above-mentioned alumina raw material powder aluminum sulfate manufacturing, the average micropore size of this prilling powder are 0.5～2.0 μ m.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003059742A JP2004269290A (en) | 2003-03-06 | 2003-03-06 | Method for manufacturing translucent alumina ceramic, translucent alumina ceramic, light emitting vessel for high-pressure discharge lamp, granulated powder, and formed body |
| JP2003059742 | 2003-03-06 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1527343A true CN1527343A (en) | 2004-09-08 |
| CN1308988C CN1308988C (en) | 2007-04-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100079359A Expired - Fee Related CN1308988C (en) | 2003-03-06 | 2004-03-05 | Light-transmission aluminium oxide ceramics and producing method thereof, luminous container granulating powder and forming body for high-voltage discharge lamp |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2004269290A (en) |
| CN (1) | CN1308988C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101511468B (en) * | 2006-07-06 | 2013-08-21 | 格雷斯公司 | Aluminum sulfate bound catalysts |
| CN104129977A (en) * | 2014-06-30 | 2014-11-05 | 金刚新材料股份有限公司 | Preparation method of alumina granulation powder specially used for hot pressing water valve block |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8278233B2 (en) | 2009-09-09 | 2012-10-02 | Ngk Insulators, Ltd. | Translucent polycrystalline sintered body, method for producing the same, and arc tube for high-intensity discharge lamp |
| WO2022163175A1 (en) * | 2021-01-28 | 2022-08-04 | 日本特殊陶業株式会社 | Wavelength conversion member and light source device provided therewith |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6022670B2 (en) * | 1978-05-12 | 1985-06-03 | 日本碍子株式会社 | Polycrystalline transparent alumina and its manufacturing method, and arc tube for high-pressure steam radiation lamps |
| CN86101452A (en) * | 1986-03-13 | 1987-09-23 | 电子工业部第十二研究所 | The transparent alumina ceramics goods and the technology that are used for high-pressure mercury lamp |
| JPH06107414A (en) * | 1992-09-24 | 1994-04-19 | Earth Chem Corp Ltd | Production of high purity alumina |
| US6027389A (en) * | 1996-08-30 | 2000-02-22 | Ngk Insulators, Ltd. | Production of ceramic tubes for metal halide lamps |
| CN1242442A (en) * | 1999-08-03 | 2000-01-26 | 龚建新 | Injection moulder for aluminium oxide ceramic wire, and method for mfg. same |
| US6642656B2 (en) * | 2000-03-28 | 2003-11-04 | Ngk Insulators, Ltd. | Corrosion-resistant alumina member and arc tube for high-intensity discharge lamp |
| JP4122746B2 (en) * | 2001-05-21 | 2008-07-23 | 住友化学株式会社 | Method for producing fine α-alumina powder |
-
2003
- 2003-03-06 JP JP2003059742A patent/JP2004269290A/en active Pending
-
2004
- 2004-03-05 CN CNB2004100079359A patent/CN1308988C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101511468B (en) * | 2006-07-06 | 2013-08-21 | 格雷斯公司 | Aluminum sulfate bound catalysts |
| CN104129977A (en) * | 2014-06-30 | 2014-11-05 | 金刚新材料股份有限公司 | Preparation method of alumina granulation powder specially used for hot pressing water valve block |
| CN104129977B (en) * | 2014-06-30 | 2016-06-29 | 金刚新材料股份有限公司 | A kind of preparation method of hot pressurized water valve block special aluminium oxide pelletizing |
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| Publication number | Publication date |
|---|---|
| JP2004269290A (en) | 2004-09-30 |
| CN1308988C (en) | 2007-04-04 |
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