CN104311132A - Preparation method of silicon nitride and silicon carbide combined wolfram carbide foam ceramic - Google Patents
Preparation method of silicon nitride and silicon carbide combined wolfram carbide foam ceramic Download PDFInfo
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- CN104311132A CN104311132A CN201410563131.0A CN201410563131A CN104311132A CN 104311132 A CN104311132 A CN 104311132A CN 201410563131 A CN201410563131 A CN 201410563131A CN 104311132 A CN104311132 A CN 104311132A
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- silicon
- silicon nitride
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- silicon carbide
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Abstract
The invention provides a preparation method of silicon nitride and silicon carbide combined wolfram carbide foam ceramic. The preparation method is characterized by comprising the following steps: uniformly mixing WC, silicon micro-powder, phenolic resin and a hydroxypropyl methyl cellulose solution to prepare ceramic slurry; then immersing the ceramic slurry on polyurethane foam; and drying and sintering in a nitrogen atmosphere to obtain the silicon nitride and silicon carbide combined wolfram carbide foam ceramic. The silicon nitride and silicon carbide combined wolfram carbide foam ceramic prepared by the preparation method has a uniform microscopic structure, high strength and uniform pore sizes; the residues of carbon and free silicon are avoided; and the strength, the high-temperature resistance and the heat impact resistance are greatly improved.
Description
Technical field
The present invention relates to a kind of silicon nitride, silicon carbide in conjunction with wolfram varbide foamed ceramics, belong to porous ceramics preparing technical field.
Background technology
Silicon nitride, silicon carbide are a kind of low bulk, corrosion-resistant, high strength, resistant to elevated temperatures structural ceramic material in conjunction with wolfram varbide composite ceramics.Silicon nitride, silicon carbide are applied to the industries such as the steel casting of large special steel casting mainly as molten steel filtering element in conjunction with wolfram varbide foamed ceramics.The problems such as the Alumina Foam Ceramics of current use, foam silicon carbide ceramics ubiquity use temperature is low, thermal shock resistance is poor, cannot meet the needs of large special steel casting continuous casting.
Summary of the invention
The object of the present invention is to provide a kind of silicon nitride, silicon carbide in conjunction with the preparation method of wolfram varbide foamed ceramics, its technical scheme is:
A kind of silicon nitride, silicon carbide is in conjunction with the preparation method of wolfram varbide foamed ceramics, by WC, silicon powder, resol is the ratio of 40 ~ 88:10 ~ 40:2 ~ 20 and concentration with weight ratio is that 0.1 ~ 0.3wt% Gonak, 40 ~ 60wt% Homogeneous phase mixing makes ceramic size, then ceramic size is immersed in polyurethane foam, after drying in nitrogen atmosphere, be 300 DEG C ~ 1450 DEG C in temperature slowly to heat up 20 ~ 100 hours, 1450 DEG C of insulations 5 ~ 10 hours, then be that 1700 ~ 1750 DEG C of insulations make silicon nitride in 20 ~ 120 minutes in temperature, silicon carbide is in conjunction with wolfram varbide foamed ceramics.
Compared with prior art, its advantage is in the present invention:
1, the present invention prepare silicon nitride, silicon carbide in conjunction with wolfram varbide foamed ceramics uniform microstructure, intensity is high, and aperture size is even;
2, the charcoal formed after resol, polyurethane foam and the Vltra tears charing that the present invention adopts and silica flour complete reaction form silicon carbide, avoid the residual of charcoal, and remaining silica flour at high temperature reacts with nitrogen and generates silicon nitride by wolfram varbide and combine, newly-generated silicon nitride, silicon carbide make silicon nitride, silicon carbide in conjunction with wolfram varbide foamed ceramics in conjunction with wolfram varbide, avoid the residual of free silica, its intensity is increased substantially;
3, this silicon nitride, silicon carbide are lightweight, high temperature resistant in conjunction with wolfram varbide foamed ceramics, thermal shock resistance is excellent.
Embodiment
embodiment 1
Be the ratio of 40:40:20 and concentration with weight ratio by WC, silicon powder, resol for 0.1wt% Gonak 40wt% Homogeneous phase mixing makes ceramic size, then ceramic size is immersed in polyurethane foam, after drying in nitrogen atmosphere, be 300 DEG C ~ 1450 DEG C in temperature and slowly heat up 20 hours, 1450 DEG C of insulations 5 hours, be then that 1700 DEG C of insulations make silicon nitride, silicon carbide for 20 minutes in conjunction with wolfram varbide foamed ceramics in temperature.
The purity of testing proportion material used is technical pure.
embodiment 2
Be the ratio of 60:25:15 and concentration with weight ratio by WC, silicon powder, resol for 0.2wt% Gonak 50wt% Homogeneous phase mixing makes ceramic size, then ceramic size is immersed in polyurethane foam, after drying in nitrogen atmosphere, be 300 DEG C ~ 1450 DEG C in temperature and slowly heat up 60 hours, 1450 DEG C of insulations 8 hours, be then that 1730 DEG C of insulations make silicon nitride, silicon carbide for 70 minutes in conjunction with wolfram varbide foamed ceramics in temperature.
The purity of testing proportion material used is technical pure.
embodiment 3
Be the ratio of 88:10:2 and concentration with weight ratio by WC, silicon powder, resol for 0.3wt% Gonak 60wt% Homogeneous phase mixing makes ceramic size, then ceramic size is immersed in polyurethane foam, after drying in nitrogen atmosphere, be 300 DEG C ~ 1450 DEG C in temperature and slowly heat up 100 hours, 1450 DEG C of insulations 10 hours, be then that 1750 DEG C of insulations make silicon nitride, silicon carbide for 120 minutes in conjunction with wolfram varbide foamed ceramics in temperature.
The purity of testing proportion material used is technical pure.
Claims (1)
1. a silicon nitride, silicon carbide is in conjunction with the preparation method of wolfram varbide foamed ceramics, it is characterized in that: by WC, silicon powder, resol is the ratio of 40 ~ 88:10 ~ 40:2 ~ 20 and concentration with weight ratio is that 0.1 ~ 0.3wt% Gonak, 40 ~ 60wt% Homogeneous phase mixing makes ceramic size, then ceramic size is immersed in polyurethane foam, after drying in nitrogen atmosphere, be 300 DEG C ~ 1450 DEG C in temperature slowly to heat up 20 ~ 100 hours, 1450 DEG C of insulations 5 ~ 10 hours, then be that 1700 ~ 1750 DEG C of insulations make silicon nitride in 20 ~ 120 minutes in temperature, silicon carbide is in conjunction with wolfram varbide foamed ceramics.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410563131.0A CN104311132B (en) | 2014-10-22 | 2014-10-22 | A kind of silicon nitride, silicon carbide are in conjunction with the preparation method of wolfram varbide foamed ceramics |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410563131.0A CN104311132B (en) | 2014-10-22 | 2014-10-22 | A kind of silicon nitride, silicon carbide are in conjunction with the preparation method of wolfram varbide foamed ceramics |
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| Publication Number | Publication Date |
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| CN104311132A true CN104311132A (en) | 2015-01-28 |
| CN104311132B CN104311132B (en) | 2016-01-06 |
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| CN201410563131.0A Expired - Fee Related CN104311132B (en) | 2014-10-22 | 2014-10-22 | A kind of silicon nitride, silicon carbide are in conjunction with the preparation method of wolfram varbide foamed ceramics |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107486246A (en) * | 2017-09-12 | 2017-12-19 | 南京大学昆山创新研究院 | WC polycrystalline foamed ceramicses catalyst, its preparation method and the method for being catalyzed waste plastics and biodiesel production hydrocarbon using it |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1325832A (en) * | 2000-05-31 | 2001-12-12 | 中国科学院金属研究所 | High-strength foam silicon carbide ceramics and its preparing process |
| KR20040096887A (en) * | 2004-10-05 | 2004-11-17 | (주)스파르탄스톤 | The manufacturing method of a lightweight foaming ceramic using of the recycling materials |
| CN101323538A (en) * | 2007-06-13 | 2008-12-17 | 山东理工大学 | Preparation of high-temperature floamed ceramic |
| CN101708402A (en) * | 2009-12-24 | 2010-05-19 | 中钢集团洛阳耐火材料研究院有限公司 | Multiphase nitride combined silicon carbide ceramic foam filter and preparation method thereof |
| CN103449802A (en) * | 2013-08-06 | 2013-12-18 | 南昌大学 | Complex-phase aluminium oxide foam ceramic material and preparation method thereof |
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2014
- 2014-10-22 CN CN201410563131.0A patent/CN104311132B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1325832A (en) * | 2000-05-31 | 2001-12-12 | 中国科学院金属研究所 | High-strength foam silicon carbide ceramics and its preparing process |
| KR20040096887A (en) * | 2004-10-05 | 2004-11-17 | (주)스파르탄스톤 | The manufacturing method of a lightweight foaming ceramic using of the recycling materials |
| CN101323538A (en) * | 2007-06-13 | 2008-12-17 | 山东理工大学 | Preparation of high-temperature floamed ceramic |
| CN101708402A (en) * | 2009-12-24 | 2010-05-19 | 中钢集团洛阳耐火材料研究院有限公司 | Multiphase nitride combined silicon carbide ceramic foam filter and preparation method thereof |
| CN103449802A (en) * | 2013-08-06 | 2013-12-18 | 南昌大学 | Complex-phase aluminium oxide foam ceramic material and preparation method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107486246A (en) * | 2017-09-12 | 2017-12-19 | 南京大学昆山创新研究院 | WC polycrystalline foamed ceramicses catalyst, its preparation method and the method for being catalyzed waste plastics and biodiesel production hydrocarbon using it |
| CN107486246B (en) * | 2017-09-12 | 2020-02-18 | 南京大学昆山创新研究院 | WC polycrystalline foamed ceramic catalyst, preparation method thereof and method for producing hydrocarbon by catalyzing waste plastic and biodiesel by using WC polycrystalline foamed ceramic catalyst |
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| CN104311132B (en) | 2016-01-06 |
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