CeO2/MoSi2改性ZrB2-SiC陶瓷的烧结性能及耐烧蚀性能

摘要/Abstract

摘要： 无压烧结ZrB₂-SiC陶瓷可制备复杂形状构件,但致密化难且耐烧蚀性能有待提高,因此亟需研究能够改善陶瓷致密化的有效烧结助剂。本文采用CeO₂和MoSi₂为烧结助剂,在1 850 ℃无压烧结1 h条件下制备了ZrB₂-SiC陶瓷,研究了CeO₂和MoSi₂对ZrB₂-SiC陶瓷烧结性能和耐烧蚀性能的影响。结果表明,当5%(体积分数)的烧结助剂中CeO₂和MoSi₂体积比为1∶1时,ZrB₂-SiC陶瓷的烧结性能、耐烧蚀性能最佳。烧结助剂在烧结过程中形成Ce-Mo液相,陶瓷颗粒在液相的表面张力下重排和传质,Ce-Mo液相促进陶瓷颗粒在毛细力下形成烧结颈,填充于陶瓷颗粒的间隙中,并在降低陶瓷晶粒的晶界能时促进致密化进程,最终获得无压烧结密度为5.02 g/cm³、相对密度为89.71%、维氏硬度为14.04 GPa的ZrB₂-SiC陶瓷。相对于未添加烧结助剂时,实际密度提高了53%,维氏硬度提高了43%。在烧蚀过程中,烧结助剂适量补充SiO₂后可促进黏度适宜的玻璃相自愈合,并提高ZrO₂的稳定性,使ZrB₂-SiC陶瓷具有最好的耐烧蚀性能,此时ZrB₂-SiC陶瓷质量烧蚀率为-1.62 mg/s,线烧蚀率为0.33 μm/s。

关键词: ZrB₂-SiC, CeO₂/MoSi₂改性, 烧结性能, 耐烧蚀性能, 无压烧结, 注浆成型

Abstract: Pressureless sintered ZrB₂-SiC ceramics can be prepared as complex shaped component. But they are challenging to densify and have poor anti-ablation resistance. Therefore, there is an urgent need to investigate effective sintering aids to improve the densification of ceramics. ZrB₂-SiC ceramics were prepared by pressureless sintered at 1 850 ℃ for 1 h using CeO₂ and MoSi₂ as sintering aids. The effects of CeO₂ and MoSi₂ on sintering properties and anti-ablation resistance of ZrB₂-SiC ceramics were investigated. The results show that sintering properties and anti-ablation resistance of ZrB₂-SiC ceramics are best when the ratio of CeO₂ and MoSi₂ in 5% (volume fraction) sintering aid is 1∶1. Sintering aids form a Ce-Mo liquid phase during the sintering process. Ceramic particles are rearranged and mass transferred under the surface tension of the liquid phase. The Ce-Mo liquid phase promotes the formation of sintered necks under capillary forces, filles the interstices of the ceramic particles and reduces the grain boundary energy of the ceramic grains to facilitate the densification process. ZrB₂-SiC ceramics are ultimately obtained with an density of 5.02 g/cm³, a relative density of 89.71%, and a Vickers hardness of 14.04 GPa. The actual density and Vickers hardness increases by 53% and 43%, respectively, compared to when no sintering aid is added. During the ablation process, CeO₂ and MoSi₂ supplemented SiO₂ in appropriate amounts to promote self-healing of the glassy phase with suitable viscosity and improve the stability of ZrO₂. The mass ablation rate and the line ablation rate are -1.62 mg/s and 0.33 μm/s, respectively.

Key words: ZrB₂-SiC, CeO₂/MoSi₂ modification, sintering property, anti-ablation resistance, pressureless sintering, slip casting

中图分类号:

TB332

方婉娴, 曾晨, 张泽, 张明瑜, 黄启忠, 高莹. CeO₂/MoSi₂改性ZrB₂-SiC陶瓷的烧结性能及耐烧蚀性能[J]. 硅酸盐通报, 2024, 43(5): 1937-1949.

FANG Wanxian, ZENG Chen, ZHANG Ze, ZHANG Mingyu, HUANG Qizhong, GAO Ying. Sintering Property and Anti-Ablation Resistance of ZrB₂-SiC Ceramics Modified by CeO₂/MoSi₂[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(5): 1937-1949.

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CeO₂/MoSi₂改性ZrB₂-SiC陶瓷的烧结性能及耐烧蚀性能

Sintering Property and Anti-Ablation Resistance of ZrB₂-SiC Ceramics Modified by CeO₂/MoSi₂

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