Dense SiC ceramics prepared by using amorphous sintering additives. Issue 11 (1st June 2022)

• Record Type: Journal Article
• Authors: Liu, Yang; Yuan, Jin-Hao; Tian, Hou-Liang; Guo, Wei-Ming; Sun, Shi-Kuan; Duan, Xiao-Ming; Jia, De-Chang; Lin, Hua-Tay
• Is Part Of: Ceramics international. Volume 48:Issue 11(2022)
• Page Start: 16449
• Page End: 16454
• Publication Date: 2022-06-01
• Subjects: SiC-based ceramics -- Glassy sintering additive -- Densification -- Microstructure -- Mechanical properties; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2022.02.292
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Spark plasma sintered SiC-based ceramics with amorphous Y2 O3 –Al2 O3 –SiO2 and CaO–Al2 O3 sintering additives prepared by melt-quench approach, were compared with those with the direct addition of raw Y2 O3 –Al2 O3 –SiO2 and CaO–Al2 O3 mixture. The relative densities of SiC-based with raw Y2 O3 –Al2 O3 –SiO2 and CaO–Al2 O3 were 95.3% and 94.3%, respectively. In spite of the same composition of sintering additive, the relative densities of SiC-based ceramics reached the values of 98.9% and 99.5% by using the glassy additives of Y2 O3 –Al2 O3 –SiO2 and CaO–Al2 O3, respectively, and the hardness of SiC-based ceramics was improved by about 22.2% and 17.2%, respectively. The amorphous sintering additive effectively improved the densification and hardness of SiC ceramics.