High-Temperature Strength of Liquid-Phase-Sintered SiC Ceramics with Oxynitride Glass

2003 ◽  
Vol 247 ◽  
pp. 267-270 ◽  
Author(s):  
Young Wook Kim ◽  
Shin Han Kim ◽  
Mamoru Mitomo ◽  
Toshiyuki Nishimura
Keyword(s):  
High Temperature ◽  
Liquid Phase ◽  
High Temperature Strength ◽  
Sic Ceramics ◽  
Oxynitride Glass

Features of the structure of a high-temperature-strength nickel alloy after liquid-phase sintering

1990 ◽  
Vol 32 (8) ◽  
pp. 618-623
Author(s):  
A. P. Gulyaev ◽  
L. P. Sergienko ◽  
A. V. Logunov ◽  
O. I. Samoilov
Keyword(s):  
High Temperature ◽  
Liquid Phase ◽  
Nickel Alloy ◽  
Liquid Phase Sintering ◽  
High Temperature Strength

306 High Temperature Strength of Crack healed Mullite/SiC Ceramics Added with Y_2O_3

2000 ◽  
Vol 2000 (0) ◽  
pp. 69-70
Author(s):  
Kiichi TSUJI ◽  
Masahiko NAKATANI ◽  
Kotoji ANDO ◽  
Shigemi SATO
Keyword(s):  
High Temperature ◽  
High Temperature Strength ◽  
Sic Ceramics

The high temperature strength of SiC ceramics based on SiO2 nano-colloidal employed

2010 ◽  
Vol 527 (21-22) ◽  
pp. 5400-5404 ◽  
Author(s):  
Ki Woo Nam ◽  
Jong Soon Kim ◽  
Seung Won Park
Keyword(s):  
High Temperature ◽  
High Temperature Strength ◽  
Sic Ceramics

Fabrication of Heat-Resistant Silicon Carbide Ceramics by Controlling Intergranular Phase

2005 ◽  
Vol 287 ◽  
pp. 299-310 ◽  
Author(s):  
Young Wook Kim ◽  
Sung Hee Lee ◽  
Toshiyuki Nishimura ◽  
Mamoru Mitomo ◽  
Je Hun Lee ◽  
...  
Keyword(s):  
High Temperature ◽  
Molar Ratio ◽  
High Temperature Strength ◽  
Intergranular Phase ◽  
Al Content ◽  
Sintering Additive ◽  
Sic Ceramics ◽  
Average Aspect Ratio ◽  
Carbide Ceramics ◽  
Silicon Carbide Ceramics

The effect of glassy-phase, using AlN and Lu2O3 as sintering additives, on the microstructure and mechanical properties of liquid-phase-sintered, and subsequently annealed SiC ceramics was investigated. The microstructure was strongly influenced by the sintering additive composition, which determines the intergranular phase (IGP). The average thickness of SiC grains increased with increasing the Lu2O3 /(AlN + Lu2O3) ratio, whereas the average aspect ratio decreased with increasing the molar ratio. The homophase and heterophase boundaries of the SiC ceramics were completely crystalline in all specimens. The room temperature (RT) strength decreased with increasing the molar ratio whereas the RT toughness showed a minimum at the molar ratio of 0.6. The best results at RT were obtained when the molar ratio was 0.2. The flexural strength and fracture toughness of the ceramics were >700 MPa and ~6 MPa.m1/2 at RT. The high temperature strength was critically affected by the chemistry, especially the content of Al in the IGP. The best strength at temperatures ³ 1500oC was obtained when the molar ratio was 0.5. Flexural strengths of the ceramics at 1500oC and 1600oC were 610 ± 80 MPa and 540 ± 30 MPa, respectively. The beneficial effect of the new additive compositions (Lu2O3-AlN) on high-temperature strength of SiC ceramics was attributed to the crystallization or removal of IGP and introduction of Al into SiC, i.e., removal or reduction of Al content from the IGP, resulting in an improved refractoriness of the IGP.

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