Gradients in elastic modulus for improved contact-damage resistance. part ii: the silicon nitride–silicon carbide system

2001 ◽  
Vol 49 (16) ◽  
pp. 3263-3268 ◽  
Author(s):  
D.C Pender ◽  
S.C Thompson ◽  
N.P Padture ◽  
A.E Giannakopoulos ◽  
S Suresh
Keyword(s):  
Silicon Carbide ◽  
Elastic Modulus ◽  
Silicon Nitride ◽  
Contact Damage ◽  
Damage Resistance ◽  
Carbide System

Foreign Object Damage Resistance of Silicon Nitride and Silicon Carbide

1990 ◽  
Vol 73 (6) ◽  
pp. 1714-1718 ◽  
Author(s):  
Hideyoshi Tsuruta ◽  
Masaaki Masuda ◽  
Takao Soma ◽  
Minoru Matsui
Keyword(s):  
Silicon Carbide ◽  
Silicon Nitride ◽  
Foreign Object ◽  
Damage Resistance ◽  
Foreign Object Damage

Microstructure and Mechanical Properties of Freeze Cast Alumina/Silicon Carbide Layered Composites

2007 ◽  
Vol 336-338 ◽  
pp. 2583-2585
Author(s):  
Tae Young Yang ◽  
Seung Woo Lyu ◽  
Young Min Park ◽  
Seog Young Yoon ◽  
Ron Stevens ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Silicon Carbide ◽  
Layered Composites ◽  
Contact Damage ◽  
Damage Resistance ◽  
Layer Interface ◽  
Small Flaw ◽  
Microstructure And Mechanical Properties

Symmetric three-layer composites prepared by sintering freeze cast compacts of alumina with additions of nanoparticle/whisker SiC, in 1-atm nitrogen at 1700-1800oC have been characterized in terms of microstructure and mechanical properties. Additions of SiC to Al2O3 result in improvement in toughness. In such cases, however, the reduction in strength at small flaw sizes must be overcome. Contact damage resistance is greatly increased in layered composites compared with monolithic composites, possibly due to redirection of indentation flaws along the layer interface.

Contact Damage and Strength Degradation in Nitrided Pressureless Sintered (NPS) Silicon Nitrided Ceramics

2007 ◽  
Vol 353-358 ◽  
pp. 102-105
Author(s):  
Chang Gyu Kang ◽  
Chul Kim ◽  
Tae Woo Kim ◽  
In Sub Han ◽  
Kee Sung Lee
Keyword(s):  
Silicon Nitride ◽  
Cost Effective ◽  
Strength Degradation ◽  
Pressureless Sintering ◽  
Contact Damage ◽  
Damage Resistance ◽  
Plastic Damage ◽  
Nitride Ceramics ◽  
Damage Response ◽  
Bend Tests

A study is made of the damage resistance and strength degradation of nitrided pressureless sintered (NPS) silicon nitride ceramics. The silicon nitride is prepared by cost-effective NPS process combining by nitridation and consecutive pressureless sintering. Contact testing with spherical indenters is used to characterize the damage response. Examination of the indentation sites indicates a quasi-plastic damage modes are observed. Bend tests on specimens containing quasi-plastic contact damages reveal those materials to be not susceptible to strength degradation.

Effect of Grain Boundary Phase on Contact Damage Resistance of Silicon Nitride Ceramics

2005 ◽  
Vol 287 ◽  
pp. 421-426 ◽  
Author(s):  
Chul Seung Lee ◽  
Kee Sung Lee ◽  
Shi Woo Lee ◽  
Do Kyung Kim
Keyword(s):  
Silicon Nitride ◽  
Grain Boundary ◽  
Grain Morphology ◽  
Boundary Phase ◽  
Contact Damage ◽  
Damage Resistance ◽  
Intergranular Phase ◽  
Nitride Ceramics ◽  
Damage Response ◽  
Different Types

Contact damage resistances of silicon nitride ceramics with various grain boundary phases are investigated in this study. The grain boundary phases are controlled by the addition of different types of sintering additives, or the crystallization of intergranular phase in a silicon nitride. We control the microstructures of materials to have similar grain sizes and the same phases to each other. Contact testing with spherical indenters is used to characterize the damage response. The implication is that the grain boundary phase can be another controllable factor against contact damage and strength degradation even though it is not critical relative to the effect of grain morphology.

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