Pressureless sintered silicon carbide with enhanced mechanical properties obtained by the two-step sintering method

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• 作者：Giuseppe Magnani ; Alida Brentari ; Emiliano Burresi ; Giancarlo Raiteri
• 关键词：A. Sintering ; C. Mechanical properties ; D. SiC
• 刊名：Ceramics International
• 出版年：January, 2014
• 年：2014
• 卷：40
• 期：1_part_PB
• 页码：1759-1763
• 全文大小：1583 K

文摘

The Two-step sintering (TSS) method was applied to the pressureless sintering of commercial silicon carbide powder doped with boron and carbon. The microstructural and mechanical properties of TSS-SiC were compared to those of sintered SiC obtained with the conventional thermal cycle (CS-SiC). TSS-SiC was densified (97.7% T.D.) at 2050 掳C instead of 2200 掳C needed for CS-SiC (97% T.D.). Furthermore, TSS-SiC showed finer microstructure and enhanced mechanical properties. In particular, flexural strength of the TSS-SiC materials greatly increased up to 556 MPa, much higher than 341 MPa reached by CS-SiC.