Gelcasting and pressureless sintering of silicon carbide ceramics using Al2O3–Y2O3 as the sintering additives

2013 ◽  
Vol 33 (10) ◽  
pp. 1695-1699 ◽  
Author(s):  
Jingxian Zhang ◽  
Dongliang Jiang ◽  
Qingling Lin ◽  
Zhongming Chen ◽  
Zhengren Huang
Keyword(s):  
Silicon Carbide ◽  
Pressureless Sintering ◽  
Sintering Additives ◽  
Carbide Ceramics ◽  
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.

Pressureless sintering of silicon carbide ceramics containing zirconium diboride

2011 ◽  
Vol 37 (6) ◽  
pp. 2031-2035 ◽  
Author(s):  
Hui Yang ◽  
Lingjie Zhang ◽  
Xingzhong Guo ◽  
Xiaoyi Zhu ◽  
Xiaojian Fu
Keyword(s):  
Silicon Carbide ◽  
Zirconium Diboride ◽  
Pressureless Sintering ◽  
Carbide Ceramics ◽  
Silicon Carbide Ceramics

The Effect of SiC Content on Pressureless Sintered Si2ON2-SiC Ceramic

2012 ◽  
Vol 562-564 ◽  
pp. 27-30
Author(s):  
Zhu Xing Tang ◽  
Hui Hui Tan ◽  
He Zhang ◽  
Ke Zhou Xu ◽  
Ying Zhang
Keyword(s):  
Silicon Carbide ◽  
Phase Composition ◽  
Silicon Oxynitride ◽  
Pressureless Sintering ◽  
Silicon Carbide Ceramic ◽  
Ceramic Samples ◽  
Sic Ceramic ◽  
Carbide Ceramics ◽  
Silicon Carbide Ceramics ◽  
Sintering Method

The Si¬2ON2-SiC ceramic was fabricated by pressureless sintering method. In this paper we researched the effect of SiC content (50%, 70% and 90%) on the performance of silicon oxynitride bonded silicon carbide ceramics. Through testing and analyzing the SEM, XRD, density and porosity of the final silicon oxynitride bonded silicon carbide ceramic samples, the results show that: changes in SiC content not only affect the bulk density of the composites but also affect the phase composition and the microstructure of fracture surface. The most compactness experimental product is sintered at1500°C containing 50wt% SiC.

Silicon carbide ceramics through temperature-induced gelation and pressureless sintering

2004 ◽  
Vol 382 (1-2) ◽  
pp. 335-340 ◽  
Author(s):  
X. Xu ◽  
S. Mei ◽  
J.M.F. Ferreira ◽  
T. Nishimura ◽  
N. Hirosaki
Keyword(s):  
Silicon Carbide ◽  
Pressureless Sintering ◽  
Carbide Ceramics ◽  
Silicon Carbide Ceramics

Mechanical Property and Ballistic Performance of Silicon Carbide

2010 ◽  
Vol 434-435 ◽  
pp. 72-75 ◽  
Author(s):  
Tian Ma ◽  
Heng Du ◽  
Zi Li Yan ◽  
Zheng Cao Li ◽  
Jian Chun Zhang
Keyword(s):  
Silicon Carbide ◽  
Flexural Strength ◽  
Mechanical Performance ◽  
The Other ◽  
Pressureless Sintering ◽  
Stoichiometric Ratio ◽  
Ballistic Performance ◽  
The Difference ◽  
Carbide Ceramics ◽  
Silicon Carbide Ceramics

Two groups of silicon carbide ceramics were prepared by pressureless sintering processing with a small amount of boron and carbon as sintering additives. The flexural strength, Vickers hardness, fracture toughness and compressive strength of the samples were measured and compared. Sample A achieved much higher flexural strength (389.4MPa) than that of sample B (250.3MPa) due to the difference of additive dosage. However, the two groups of samples attained comparable values for the other three mechanical properties. SEM observation revealed that the stoichiometric ratio of the Si/C atom in the sintered body is an important factor to affect the mechanical performance of the silicon carbide. The ballistic performance of the samples was also evaluated in this study. The results showed that sample B exhibited more excellent ballistic property, which is probably related to the high flexural strength. The detailed influencing factors need to be studied further.

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