Bending Fracture Strength of Sintered Silicon Nitride Disks with Shoulder Fillet at Room Temperature

1992 ◽  
pp. 247-259 ◽  
Author(s):  
Seijiro Hayashi ◽  
Akihiko Suzuki
Keyword(s):  
Silicon Nitride ◽  
Fracture Strength ◽  
Room Temperature ◽  
Bending Fracture ◽  
Sintered Silicon

Room-Temperature Strength of Sintered Silicon Nitride Subjected to High-Temperature Creep Loading

1994 ◽  
Author(s):  
Yoshizumi Nakasuji ◽  
Hiroyuki Iwasaki ◽  
Hiroaki Sakai
Keyword(s):  
Silicon Nitride ◽  
Room Temperature ◽  
Strength Degradation ◽  
Creep Tests ◽  
Second Stage ◽  
Two Stages ◽  
Creep Loading ◽  
Applied Stresses ◽  
Room Temperature Strength ◽  
Sintered Silicon

Room-temperature strength was evaluated using sintered silicon nitride crept specimens. Creep tests were performed using 4-point bending loading at 1400°C in air. The bending creep tests applied stresses from 100 to 400 MPa for 10−1 to 3×103 hours. For applied stress over 200 MPa, the room-temperature strength of the crept specimen had two stages. In the first stage the strength degraded slowly, and in the second stage the strength degraded rapidly. In the first stage, oxidation caused the strength degradation, since the degradation was similar for the different applied stresses. In the second stage, large creep deformation mainly caused the strength degradation. Early in the stage, creep induced matrix and boundary damage under the oxidation layer caused the degradation. At the end of the stage, cracks induced by creep caused the degradation.

Relevance of internal structures to the fracture strength of injection-molded and sintered silicon nitride ceramics

2005 ◽  
Vol 16 (5) ◽  
pp. 425-434 ◽  
Author(s):  
Nobuhiro Shinohara ◽  
Shigeru Ohsaka ◽  
Tadashi Hotta ◽  
Hiroya Abe ◽  
Makio Makio ◽  
...  
Keyword(s):  
Silicon Nitride ◽  
Fracture Strength ◽  
Internal Structures ◽  
Nitride Ceramics ◽  
Injection Molded ◽  
Sintered Silicon
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