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Catalytic reaction sintered silicon carbide ceramic and preparation method thereof
The invention discloses a catalytic reaction sintered silicon carbide ceramic and a preparation method thereof, and belongs to the technical field of inorganic nonmetallic materials. The preparation method comprises the following steps: uniformly mixing silicon with an in-situ catalyst zirconium disilicide to prepare an infiltration material, putting a SiC/C biscuit or a pure C biscuit into a graphite crucible, completely embedding the ceramic biscuit by using sufficient Si/ZrSi2 infiltration material, and carrying out infiltration and catalytic reaction under a vacuum condition to generate the silicon carbide ceramic. According to the invention, zirconium disilicide is added as a catalyst on the basis of using silicon powder as an infiltration raw material, the eutectic point and viscosity of the infiltration material are significantly reduced, the infiltration efficiency is effectively improved, zirconium disilicide has a significant catalysis effect on silicon carbide generated by reaction of silicon and carbon, and thus the content of residual silicon is reduced; zirconium disilicide and zirconium carbide dispersed phases which are high in melting point and resistant to corrosion exist on the grain boundary of the silicon carbide ceramic sintered through the catalytic reaction, and the excellent performance of high strength, high toughness, high temperature resistance, corrosion resistance and the like can be obtained easily.
本发明公开一种催化反应烧结碳化硅陶瓷及其制备方法，属于无机非金属材料技术领域。将硅与原位催化剂二硅化锆混合均匀，制备成熔渗料，将SiC/C素坯或者纯C素坯放石墨坩埚中，使用足量的Si/ZrSi2熔渗料完全包埋陶瓷素坯，并在真空条件下熔渗，催化反应生成碳化硅陶瓷。本发明在以硅粉为熔渗原料的基础上，加入了二硅化锆作为催化剂，显著降低了熔渗料的低共熔点和粘度，有效提升了熔渗效率，二硅化锆对于硅与碳反应生成碳化硅具有显著的催化作用，从而降低残余硅含量；催化反应烧结碳化硅陶瓷的晶界上存在高熔点、耐腐蚀的二硅化锆、碳化锆弥散相，有助于获得高强度、高韧性、耐高温、耐腐蚀等优异性能。
Catalytic reaction sintered silicon carbide ceramic and preparation method thereof
The invention discloses a catalytic reaction sintered silicon carbide ceramic and a preparation method thereof, and belongs to the technical field of inorganic nonmetallic materials. The preparation method comprises the following steps: uniformly mixing silicon with an in-situ catalyst zirconium disilicide to prepare an infiltration material, putting a SiC/C biscuit or a pure C biscuit into a graphite crucible, completely embedding the ceramic biscuit by using sufficient Si/ZrSi2 infiltration material, and carrying out infiltration and catalytic reaction under a vacuum condition to generate the silicon carbide ceramic. According to the invention, zirconium disilicide is added as a catalyst on the basis of using silicon powder as an infiltration raw material, the eutectic point and viscosity of the infiltration material are significantly reduced, the infiltration efficiency is effectively improved, zirconium disilicide has a significant catalysis effect on silicon carbide generated by reaction of silicon and carbon, and thus the content of residual silicon is reduced; zirconium disilicide and zirconium carbide dispersed phases which are high in melting point and resistant to corrosion exist on the grain boundary of the silicon carbide ceramic sintered through the catalytic reaction, and the excellent performance of high strength, high toughness, high temperature resistance, corrosion resistance and the like can be obtained easily.
本发明公开一种催化反应烧结碳化硅陶瓷及其制备方法，属于无机非金属材料技术领域。将硅与原位催化剂二硅化锆混合均匀，制备成熔渗料，将SiC/C素坯或者纯C素坯放石墨坩埚中，使用足量的Si/ZrSi2熔渗料完全包埋陶瓷素坯，并在真空条件下熔渗，催化反应生成碳化硅陶瓷。本发明在以硅粉为熔渗原料的基础上，加入了二硅化锆作为催化剂，显著降低了熔渗料的低共熔点和粘度，有效提升了熔渗效率，二硅化锆对于硅与碳反应生成碳化硅具有显著的催化作用，从而降低残余硅含量；催化反应烧结碳化硅陶瓷的晶界上存在高熔点、耐腐蚀的二硅化锆、碳化锆弥散相，有助于获得高强度、高韧性、耐高温、耐腐蚀等优异性能。
Catalytic reaction sintered silicon carbide ceramic and preparation method thereof
一种催化反应烧结碳化硅陶瓷及其制备方法
QIAN ZHUANG (Autor:in) / LI YINSHENG (Autor:in) / ZHAN ZHAOLIN (Autor:in) / HUANG BINWEI (Autor:in) / NIE HAIFENG (Autor:in) / HUANG QING (Autor:in)
26.05.2023
Patent
Elektronische Ressource
Chinesisch
IPC:
C04B
Kalk
,
LIME
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