Crack propagation and failure prediction in silicon nitride at elevated temperatures

1974 ◽  
Vol 9 (2) ◽  
pp. 270-278 ◽  
Author(s):  
A. G. Evans ◽  
S. M. Wiederhorn
Keyword(s):  
Silicon Nitride ◽  
Crack Propagation ◽  
Elevated Temperatures ◽  
Failure Prediction

Failure Prediction of the Thermal Fatigue of Silicon Nitride

1975 ◽  
Vol 58 (11-12) ◽  
pp. 513-516 ◽  
Author(s):  
D. P. H. HASSELMAN ◽  
E. P. CHEN ◽  
C. L. AMMANN ◽  
J. E. DOHERTY ◽  
C. G. NESSLER
Keyword(s):  
Silicon Nitride ◽  
Thermal Fatigue ◽  
Failure Prediction

Stress Rupture in Tension and Flexure of a SiC-Whisker-Reinforced Silicon Nitride Composite at Elevated Temperatures

2005 ◽  
Vol 79 (10) ◽  
pp. 2789-2791 ◽  
Author(s):  
Shijie Zhu ◽  
Mineo Mizuno ◽  
Yasuo Nagano ◽  
Yutaka Kagawa ◽  
Makoto Watanabe
Keyword(s):  
Silicon Nitride ◽  
Elevated Temperatures ◽  
Stress Rupture

scholarly journals Experiment on Foreign Object Damage of Gas Turbine-Grade Silicon Nitride Ceramic

1998 ◽  
Author(s):  
Hiro Yoshida ◽  
Takashi Nakashima ◽  
Makoto Yoshida ◽  
Yasushi Hara ◽  
Toru Shimamori
Keyword(s):  
Elevated Temperature ◽  
Silicon Nitride ◽  
Elevated Temperatures ◽  
Tensile Load ◽  
Strength Degradation ◽  
Spall Fracture ◽  
Silicon Nitride Ceramic ◽  
Impact Tests ◽  
The Impact ◽  
Bending Fracture

A new high quality turbine system using monolithic silicon-nitride ceramic is under development. In this study particle impact tests of the silicon-nitride have been tried at room and elevated temperatures with and without tensile load, which simulates centrifugal force of blade rotation. In the experiment 1 mm diameter particle is impacted at velocities up to 900 m s−1. In this paper, critical velocities for bending fracture and Hertzian cracks are examined. Moreover, strength degradation at elevated temperature and spall fracture of the blade are discussed. The main results are: 1) The bending fracture mode critical impact velocity for soft particles is higher than that for hard particles. 2)The impact parameter ϕ for initiation of Hertzian cracks ranges 1.08×10−5 – 1.56×10−5 for the materials tested. 3)Strength degradation at elevated temperature was clearly observed. 4) In the impact tests on blades spall fracture, which was caused by interaction of stress waves, appeared.

scholarly journals Crack Propagation Behavior in Gas Pressure Sintered Silicon Nitride

1992 ◽  
Vol 100 (1158) ◽  
pp. 117-121 ◽  
Author(s):  
Satoshi IIO ◽  
Tomonori NIWA ◽  
Yo TAJIMA ◽  
Masakazu WATANABE
Keyword(s):  
Silicon Nitride ◽  
Crack Propagation ◽  
Gas Pressure ◽  
Propagation Behavior ◽  
Crack Propagation Behavior ◽  
Sintered Silicon

Characteristics and Applications of Nanostructured Nitrides Synthesized by Vapor Phase Reactions

2005 ◽  
Vol 876 ◽  
Author(s):  
Gerald Ziegenbalg ◽  
Carsten Pätzold ◽  
Ute Ŝingliar ◽  
Rico Berthold
Keyword(s):  
Silicon Nitride ◽  
Amorphous Silicon ◽  
Vapor Phase ◽  
Elevated Temperatures ◽  
Catalyst Support ◽  
Chemical Properties ◽  
Molar Ratio ◽  
Basic Catalyst ◽  
Metal Chlorides ◽  
Amorphous Silicon Nitride

AbstractGas phase ammonolysis of volatile metal chlorides at elevated temperatures is a favorable way to produce nitride or oxynitride nanopowders. Their composition as well as the physico-chemical properties is determined by reaction temperature, molar ratio of the reactants and the residence time of the gases in the reaction zone. Both single and multi component powders can be obtained. Typical particle sizes are in the range of 50 to 350 nm. The specific surface can reach values up to 300 m2/g. Microporous analysis revealed the presence of pores with a diameter between 0.6 and 0.7 nm in amorphous silicon nitride. The powders can be used, depending on the characteristics, as catalyst or basic catalyst support. The paper gives an overview about vapor phase synthesis of single and multi component nitrides as well as the use of amorphous silicon nitride as a basic catalyst support for dehydrogenation of propane.

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