Effects of Intergranular Phase Chemistry on the Microstructure and Mechanical Properties of Silicon Carbide Ceramics Densified with Rare-Earth Oxide and Alumina Additions

2004 ◽  
Vol 84 (7) ◽  
pp. 1642-1644 ◽  
Author(s):  
You Zhou ◽  
Kiyoshi Hirao ◽  
Motohiro Toriyama ◽  
Yukihiko Yamauchi ◽  
Shuzo Kanzaki
Keyword(s):  
Mechanical Properties ◽  
Silicon Carbide ◽  
Rare Earth ◽  
Rare Earth Oxide ◽  
Intergranular Phase ◽  
Microstructure And Mechanical Properties ◽  
Carbide Ceramics ◽  
Phase Chemistry ◽  
Silicon Carbide Ceramics

Microstructure and Mechanical Properties of Heat-Resistant Silicon Carbide Ceramics

2007 ◽  
Vol 336-338 ◽  
pp. 1409-1413 ◽  
Author(s):  
Young Wook Kim ◽  
Yong Seong Chun ◽  
Sung Hee Lee ◽  
Ji Yeon Park ◽  
Toshiyuki Nishimura ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Silicon Carbide ◽  
Intergranular Phase ◽  
Sintering Additives ◽  
Heat Resistant ◽  
Sic Ceramics ◽  
Microstructure And Mechanical Properties ◽  
Carbide Ceramics ◽  
Silicon Carbide Ceramics

There has been a great progress in the development of heat-resistant silicon carbide ceramics, owing to the better understanding of composition-microstructure-properties relations. Based on the progress, it has been possible to fabricate heat-resistant SiC ceramics with improved fracture toughness. In this paper, three rare-earth oxides (Re2O3, Re=Er, Lu, and Sc) in combination with AlN were used as sintering additives for a β-SiC containing 1 vol% α-SiC seeds. The effect of intergranular phase, using Re2O3 and AlN as sintering additives, on the microstructure and mechanical properties of liquid-phasesintered, and subsequently annealed SiC ceramics were investigated. The microstructure and mechanical properties were strongly influenced by the sintering additive composition, which determines the chemistry and structure of IGP. The strength and fracture toughness of the Lu2O3-doped SiC were ∼700 MPa at 1400oC and ∼6 MPa.m1/2 at room temperature, respectively. The beneficial effect of the new additive compositions on high-temperature strength was attributed to the crystallization of the intergranular phase.

Effects of SiO2 and Rare-Earth Oxide Additions on Densification and Mechanical Properties of Silicon Carbide Ceramics

2003 ◽  
Vol 247 ◽  
pp. 165-168 ◽  
Author(s):  
Toyohiko Yano ◽  
Dae Chul Park ◽  
Yasutaka Horie ◽  
Hirofumi Inoue ◽  
Keiichi Katayama ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Silicon Carbide ◽  
Rare Earth ◽  
Rare Earth Oxide ◽  
Carbide Ceramics ◽  
Silicon Carbide Ceramics
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