CN101157545A - Method for doping polycrystalline alumina ceramics - Google Patents
Method for doping polycrystalline alumina ceramics Download PDFInfo
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- CN101157545A CN101157545A CNA2007100464345A CN200710046434A CN101157545A CN 101157545 A CN101157545 A CN 101157545A CN A2007100464345 A CNA2007100464345 A CN A2007100464345A CN 200710046434 A CN200710046434 A CN 200710046434A CN 101157545 A CN101157545 A CN 101157545A
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Abstract
The invention discloses a method of doping in polycrystal alumina ceramics, including the following steps: the alumina product is formed first and is initially burnt under the temperature of 900 DEG C to 1,250 DEG C for one or two hours; then the burnt alumina product is put together with the impurity but the two do not contact directly, and then are heated to 800 -1,500 DEG C for two hours to five hours, thereby ensuring that impurity is heated and changed into steam which is evenly distributed on an alumina product; last, the alumina product with the impurity is heated for a third time to 1,700 to 2,000 DEG C for 10 hours to 12 hours. The invention adopting steam doping can keep the distribution of impurities more even, in particular suitable for the doping of impurity in small quantity. The invention has the advantages of mechanical production, fast speed and large yield, etc. in comparison with prior slurry blending doping patterns.
Description
Technical field
The present invention relates to a kind of manufacture method of pottery, particularly relate to the method for in polycrystalline alumina ceramic, adding a small amount of auxiliary material.
Background technology
In high-intensity gas discharge lamp, adopt semi-transparent polycrystal aluminium oxide (PCA) to make arctube material.The production technique of PCA comprises following basic step: batch mixing, moulding and pre-densification, solid state sintering.Wherein batch mixing is to add additive, binding agent and other helps the chemical of moulding, as dispersion agent, and defoamer, lubricant etc.We are many to be raw material with the high-purity superfine alumina powder, is equipped with the proper amount of rare-earth compound, and the mode that adds the water for ball milling form slurry is finished batch mixing.When producing ceramic discharge tube,, in aluminum oxide powder, also need add magnesium oxide in order to obtain more uniform crystal grain.Owing in the discharge tube of ceramic gold-halogen lamp metal halide is arranged, and it can produce reaction with magnesium oxide, influence life-span, light efficiency of lamp etc., so amount will be lacked as much as possible when adding, when the impurity of our admixture is less than 250PPM, be difficult to it is mixed uniformly with aforesaid method, the effect that burns out does not often reach pre-provisioning request.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of method of adding auxiliary material in polycrystalline alumina ceramic, and the material of interpolation is more evenly distributed in pottery, obtains the more excellent product of performance.
In order to solve the problems of the technologies described above, the present invention adopts following technical scheme: a kind of in polycrystalline alumina ceramic adulterated method, may further comprise the steps:
A) will carry out after the alumina product moulding earlier just burning, temperature is at 900 ℃～1250 ℃, 1～2 hour time;
B) put together heating but directly do not contact of the alumina product that then moulding was just burnt and impurity to be added, 800 ℃～1500 ℃ of Heating temperatures, 2～5 hours time, impurity is heated becomes steam, be covered with equably on alumina product;
C) will carry out high fever for the third time with the alumina product of impurity at last, 1700 ℃～2000 ℃ of temperature, 10～12 hours time.
The present invention adopts the adulterated method of steam, can make profile of impurities more even, is specially adapted to the admixture small amount of impurities.Compare with slurry mixing and doping mode in the past, it also has can mechanize production, advantage such as speed is fast, output is big.
As the improvement to aforesaid method, the impurity to be added in the step b) places in the semienclosed container, also is provided with a hole container in this semienclosed container, and described alumina product places in this hole container.So both solid-state impurity and alumina product can be isolated, can be covered with on alumina product equably after making impurity become steam again.
Description of drawings
Below in conjunction with the drawings and specific embodiments the present invention is described in further detail.
Fig. 1 is a kind of structure of container that adulterating method of the present invention is used.
Fig. 2 is the distribution graph of the polycrystalline alumina ceramic grain size that makes of adulterating method of the present invention and existing slurry hybrid system.
Embodiment
Adulterating method of the present invention is that elder generation will carry out after the alumina product moulding just burning, and increase physical strength, just burn temperature at 900 ℃～1250 ℃, 1～2 hour time; The alumina product that moulding was just burnt is placed in the hole container shown in Figure 12 then, again it is placed in the semi-enclosed container 1, the impurity that needs interpolation is being placed in semi-enclosed container 1 the inside, and be dispersed in hole container 2 around, this moment, impurity and product were kept apart because of container with holes 2, then they are delivered in the High Temperature Furnaces Heating Apparatus together and heat, Heating temperature is at 800 ℃～1500 ℃, 2～5 hours time, impurity is heated and becomes steam in this process, by aperture, be covered with equably on product; To carry out high fever for the third time with the alumina product of impurity again, temperature is at 1700 ℃～2000 ℃ at this moment, and 10～12 hours time, impurity merges wherein fully, obtains the polycrystalline alumina ceramic product that needs.
This method has been saved a lot of moulding complicated preparation works in early stage, and it is also more simply more even to mix, and produces mechanize more, can improve production rate effectively, strengthens output.
The following table that steam doping method of the present invention and existing slurry hybrid system are made is that the grain size that two kinds of adulterating methods are made the polycrystalline alumina ceramic discharge tube is added up contrast, as shown in Figure 2, its abscissa is represented grain size (μ m), and ordinate is represented the frequency that occurs.
As seen from Figure 2, the vitrified pipe grain size that adopts the steam doping method to obtain distributes more even, the vitrified pipe grain size that adopts the slurry hybrid system to obtain distributes and relatively disperses, this also illustrates and adopts steam doping method of the present invention can make profile of impurities more even, thereby improves the performance of product.
Claims (2)
1. adulterated method in polycrystalline alumina ceramic may further comprise the steps:
A) will carry out after the alumina product moulding earlier just burning, temperature is at 900 ℃～1250 ℃, 1～2 hour time;
B) put together heating but directly do not contact of the alumina product that then moulding was just burnt and impurity to be added, 800 ℃～1500 ℃ of Heating temperatures, 2～5 hours time, impurity is heated becomes steam, be covered with equably on alumina product:
C) will carry out high fever for the third time with the alumina product of impurity at last, 1700 ℃～2000 ℃ of temperature, 10～12 hours time.
2. according to claim 1 in polycrystalline alumina ceramic adulterated method, it is characterized in that: the impurity to be added in the step b) places in the semienclosed container (1), also be provided with a hole container (2) in this semienclosed container (1), described alumina product places in this hole container (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100464345A CN101157545A (en) | 2007-09-26 | 2007-09-26 | Method for doping polycrystalline alumina ceramics |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100464345A CN101157545A (en) | 2007-09-26 | 2007-09-26 | Method for doping polycrystalline alumina ceramics |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101157545A true CN101157545A (en) | 2008-04-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007100464345A Pending CN101157545A (en) | 2007-09-26 | 2007-09-26 | Method for doping polycrystalline alumina ceramics |
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| CN (1) | CN101157545A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103492327A (en) * | 2011-04-13 | 2014-01-01 | 圣戈本陶瓷及塑料股份有限公司 | Refractory object including beta alumina and processes of making and using the same |
| US9902653B2 (en) | 2012-01-11 | 2018-02-27 | Saint-Gobain Ceramics & Plastics, Inc. | Refractory object and process of forming a glass sheet using the refractory object |
| CN109768246A (en) * | 2018-12-29 | 2019-05-17 | 湖南中科星城石墨有限公司 | A kind of nano-silicon composite anode materials and preparation method thereof for lithium ion battery |
| US11814317B2 (en) | 2015-02-24 | 2023-11-14 | Saint-Gobain Ceramics & Plastics, Inc. | Refractory article and method of making |
-
2007
- 2007-09-26 CN CNA2007100464345A patent/CN101157545A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103492327A (en) * | 2011-04-13 | 2014-01-01 | 圣戈本陶瓷及塑料股份有限公司 | Refractory object including beta alumina and processes of making and using the same |
| US9902653B2 (en) | 2012-01-11 | 2018-02-27 | Saint-Gobain Ceramics & Plastics, Inc. | Refractory object and process of forming a glass sheet using the refractory object |
| US10590041B2 (en) | 2012-01-11 | 2020-03-17 | Saint-Gobain Ceramics & Plastics, Inc. | Refractory object and process of forming a glass sheet using the refractory object |
| US11814317B2 (en) | 2015-02-24 | 2023-11-14 | Saint-Gobain Ceramics & Plastics, Inc. | Refractory article and method of making |
| CN109768246A (en) * | 2018-12-29 | 2019-05-17 | 湖南中科星城石墨有限公司 | A kind of nano-silicon composite anode materials and preparation method thereof for lithium ion battery |
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Open date: 20080409 |