CN104311100A - Preparation method of silicon nitride, silicon carbide and tantalum carbide combined foam ceramic - Google Patents
Preparation method of silicon nitride, silicon carbide and tantalum carbide combined foam ceramic Download PDFInfo
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- CN104311100A CN104311100A CN201410562966.4A CN201410562966A CN104311100A CN 104311100 A CN104311100 A CN 104311100A CN 201410562966 A CN201410562966 A CN 201410562966A CN 104311100 A CN104311100 A CN 104311100A
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Abstract
The invention relates to a preparation method of silicon nitride, silicon carbide and tantalum carbide combined foam ceramic. The preparation method is characterized by comprising the following steps: uniformly mixing TaC, 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 tantalum carbide combined foam ceramic. The silicon nitride, silicon carbide and tantalum 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 tantalum carbide 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 tantalum carbide 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 tantalum carbide 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 tantalum carbide foamed ceramics, its technical scheme is:
A kind of silicon nitride, silicon carbide is in conjunction with the preparation method of tantalum carbide foamed ceramics, by TaC, 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 tantalum carbide 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 tantalum carbide 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 tantalum carbide and combine, newly-generated silicon nitride, silicon carbide make silicon nitride, silicon carbide in conjunction with tantalum carbide foamed ceramics in conjunction with tantalum carbide, 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 tantalum carbide foamed ceramics, thermal shock resistance is excellent.
Embodiment
embodiment 1
Be the ratio of 40:40:20 and concentration with weight ratio by TaC, 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 tantalum carbide 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 TaC, 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 tantalum carbide 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 TaC, 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 tantalum carbide 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 tantalum carbide foamed ceramics, it is characterized in that: by TaC, 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 tantalum carbide foamed ceramics.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410562966.4A CN104311100B (en) | 2014-10-22 | 2014-10-22 | A kind of silicon nitride, silicon carbide are in conjunction with the preparation method of tantalum carbide foamed ceramics |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410562966.4A CN104311100B (en) | 2014-10-22 | 2014-10-22 | A kind of silicon nitride, silicon carbide are in conjunction with the preparation method of tantalum carbide foamed ceramics |
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| Publication Number | Publication Date |
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| CN104311100A true CN104311100A (en) | 2015-01-28 |
| CN104311100B CN104311100B (en) | 2016-01-20 |
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| CN201410562966.4A Expired - Fee Related CN104311100B (en) | 2014-10-22 | 2014-10-22 | A kind of silicon nitride, silicon carbide are in conjunction with the preparation method of tantalum carbide foamed ceramics |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111087228A (en) * | 2019-12-04 | 2020-05-01 | 宜兴市耐火材料有限公司 | Nano-silicon in-situ generated ceramic phase enhanced aluminum-carbon sliding plate and preparation process thereof |
| CN111087229A (en) * | 2019-12-05 | 2020-05-01 | 宜兴市耐火材料有限公司 | Nano-material modified high-oxidation-resistance long nozzle and preparation process thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101215173A (en) * | 2008-01-04 | 2008-07-09 | 中国科学院上海硅酸盐研究所 | Method for preparing ZrB2-SiC-ZrC diphase ceramic material |
| CN101323538A (en) * | 2007-06-13 | 2008-12-17 | 山东理工大学 | Preparation of high-temperature floamed ceramic |
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2014
- 2014-10-22 CN CN201410562966.4A patent/CN104311100B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101323538A (en) * | 2007-06-13 | 2008-12-17 | 山东理工大学 | Preparation of high-temperature floamed ceramic |
| CN101215173A (en) * | 2008-01-04 | 2008-07-09 | 中国科学院上海硅酸盐研究所 | Method for preparing ZrB2-SiC-ZrC diphase ceramic material |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111087228A (en) * | 2019-12-04 | 2020-05-01 | 宜兴市耐火材料有限公司 | Nano-silicon in-situ generated ceramic phase enhanced aluminum-carbon sliding plate and preparation process thereof |
| CN111087229A (en) * | 2019-12-05 | 2020-05-01 | 宜兴市耐火材料有限公司 | Nano-material modified high-oxidation-resistance long nozzle and preparation process thereof |
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| CN104311100B (en) | 2016-01-20 |
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