Effect of heating rate on the shrinkage and microstructure of liquid phase sintered SiC ceramics. Issue 15 (15th November 2016)

• Record Type: Journal Article
• Authors: Ribeiro, S.; Gênova, L.A.; Ribeiro, G.C.; Oliveira, M.R.; Bressiani, A.H.A.
• Is Part Of: Ceramics international. Volume 42:Issue 15(2016)
• Page Start: 17398
• Page End: 17404
• Publication Date: 2016-11-15
• Subjects: D.SiC -- Dilatometry -- Shrinkage -- Heating rate; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2016.08.039
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: This paper describes a study of shrinkage behavior in the liquid phase sintering of silicon carbide, SiC, using eutectic mixtures of Al2 O3 +Dy2 O3 and Al2 O3 +Yb2 O3 as liquid-forming additives. A volume fraction 10% of these mixtures was added to the SiC and homogenized in an attrition mill. Sintering was performed in a horizontal dilatometer at 1800 °C for 60 min, applying heating rates of 10, 20 and 30 °C/min. The results indicate that these heating rates affected neither shrinkage nor microstructure, from the standpoint of the complete sintering cycle. However, significant differences occurred during the non-isothermal sintering stage, leading to very different shrinkage results as a function of the heating rate. Higher heating rates produced lower shrinkage, and the work of final shrinkage occurred during the isothermal stage.