CN104311136A - Preparation method of silicon nitride, silicon carbide and boron carbide combined foam ceramic - Google Patents
Preparation method of silicon nitride, silicon carbide and boron carbide combined foam ceramic Download PDFInfo
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- CN104311136A CN104311136A CN201410563207.XA CN201410563207A CN104311136A CN 104311136 A CN104311136 A CN 104311136A CN 201410563207 A CN201410563207 A CN 201410563207A CN 104311136 A CN104311136 A CN 104311136A
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Abstract
The invention relates to a preparation method of silicon nitride, silicon carbide and boron carbide combined foam ceramic. The preparation method is characterized by comprising the following steps: uniformly mixing B4C, silicon micropowder and phenolic resin in addition to a hydroxypropyl methyl cellulose solution to prepare ceramic slurry; then, impregnating the ceramic slurry on polyurethane foam; and drying and firing in a nitrogen polyurethane to prepare the silicon nitride, silicon carbide and boron carbide combined foam ceramic. The silicon nitride, silicon carbide and boron carbide combined foam ceramic prepared by the invention is uniform in micro-structure, high in strength and uniform in pore size, and carbon and residue of free silicon are avoided, so that the strength, high-temperature resistance and hot impact resistance are greatly improved.
Description
Technical field
The present invention relates to a kind of silicon nitride, silicon carbide in conjunction with norbide 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 boron carbide composite ceramic.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 norbide 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 norbide foamed ceramics, its technical scheme is:
Silicon nitride, silicon carbide in conjunction with a preparation method for norbide foamed ceramics, by B
4c, silicon powder, resol are 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 and slowly heat up 20 ~ 100 hours, 1450 DEG C of insulations 5 ~ 10 hours, be then that 1700 ~ 1750 DEG C of insulations make silicon nitride, silicon carbide for 20 ~ 120 minutes in conjunction with norbide foamed ceramics in temperature.
Compared with prior art, its advantage is in the present invention:
1, the present invention prepare silicon nitride, silicon carbide in conjunction with norbide 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 norbide and combine, newly-generated silicon nitride, silicon carbide make silicon nitride, silicon carbide in conjunction with norbide foamed ceramics in conjunction with norbide, 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 norbide foamed ceramics, thermal shock resistance is excellent.
Embodiment
embodiment 1
By B
4c, silicon powder, resol take weight ratio as the ratio of 40:40:20 and concentration 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 norbide foamed ceramics in temperature.
The purity of testing proportion material used is technical pure.
embodiment 2
By B
4c, silicon powder, resol take weight ratio as the ratio of 60:25:15 and concentration 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 norbide foamed ceramics in temperature.
The purity of testing proportion material used is technical pure.
embodiment 3
By B
4c, silicon powder, resol take weight ratio as the ratio of 88:10:2 and concentration 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 norbide foamed ceramics in temperature.
The purity of testing proportion material used is technical pure.
Claims (1)
1. silicon nitride, silicon carbide are in conjunction with a preparation method for norbide foamed ceramics, it is characterized in that: by B
4c, silicon powder, resol are 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 and slowly heat up 20 ~ 100 hours, 1450 DEG C of insulations 5 ~ 10 hours, be then that 1700 ~ 1750 DEG C of insulations make silicon nitride, silicon carbide for 20 ~ 120 minutes in conjunction with norbide foamed ceramics in temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410563207.XA CN104311136B (en) | 2014-10-22 | 2014-10-22 | A kind of silicon nitride, silicon carbide are in conjunction with the preparation method of norbide foamed ceramics |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410563207.XA CN104311136B (en) | 2014-10-22 | 2014-10-22 | A kind of silicon nitride, silicon carbide are in conjunction with the preparation method of norbide foamed ceramics |
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| Publication Number | Publication Date |
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| CN104311136A true CN104311136A (en) | 2015-01-28 |
| CN104311136B CN104311136B (en) | 2016-02-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410563207.XA Expired - Fee Related CN104311136B (en) | 2014-10-22 | 2014-10-22 | A kind of silicon nitride, silicon carbide are in conjunction with the preparation method of norbide foamed ceramics |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113999043A (en) * | 2021-10-29 | 2022-02-01 | 南京航空航天大学 | Interpenetrating mullite/boron carbide foamed ceramic high-temperature-resistant neutron shielding material and preparation method thereof |
| CN114621024A (en) * | 2022-03-23 | 2022-06-14 | 山东华屹科创纳米材料有限公司 | High-purity toughened boron carbide foamed ceramic and preparation method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1654432A (en) * | 2004-10-11 | 2005-08-17 | 西安交通大学 | Method for preparing silicon nitride/silicon carbide porous ceramic |
| CN101323538A (en) * | 2007-06-13 | 2008-12-17 | 山东理工大学 | Preparation of high-temperature floamed ceramic |
| CN101591170A (en) * | 2008-05-30 | 2009-12-02 | 山东理工大学 | The preparation method of boride porous ceramic |
| CN103011887A (en) * | 2011-09-28 | 2013-04-03 | 贵州师范大学 | Silicon carbide foamed ceramics and preparation method thereof |
| CN103073332A (en) * | 2013-02-05 | 2013-05-01 | 中国科学院上海硅酸盐研究所 | Transition metal carbide ceramics with nano-pore structure and preparation method thereof |
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2014
- 2014-10-22 CN CN201410563207.XA patent/CN104311136B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1654432A (en) * | 2004-10-11 | 2005-08-17 | 西安交通大学 | Method for preparing silicon nitride/silicon carbide porous ceramic |
| CN101323538A (en) * | 2007-06-13 | 2008-12-17 | 山东理工大学 | Preparation of high-temperature floamed ceramic |
| CN101591170A (en) * | 2008-05-30 | 2009-12-02 | 山东理工大学 | The preparation method of boride porous ceramic |
| CN103011887A (en) * | 2011-09-28 | 2013-04-03 | 贵州师范大学 | Silicon carbide foamed ceramics and preparation method thereof |
| CN103073332A (en) * | 2013-02-05 | 2013-05-01 | 中国科学院上海硅酸盐研究所 | Transition metal carbide ceramics with nano-pore structure and preparation method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113999043A (en) * | 2021-10-29 | 2022-02-01 | 南京航空航天大学 | Interpenetrating mullite/boron carbide foamed ceramic high-temperature-resistant neutron shielding material and preparation method thereof |
| CN114621024A (en) * | 2022-03-23 | 2022-06-14 | 山东华屹科创纳米材料有限公司 | High-purity toughened boron carbide foamed ceramic and preparation method thereof |
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| CN104311136B (en) | 2016-02-24 |
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