Simulation of Cold Compaction Densification Behavior of Silicon Nitride Ceramic Powder

1998 ◽  
Vol 81 (12) ◽  
pp. 3318-3320 ◽  
Author(s):  
Xue-Kun Sun ◽  
Ki-Tae Kim ◽  
Guo-Dong Wang
Keyword(s):  
Silicon Nitride ◽  
Ceramic Powder ◽  
Densification Behavior ◽  
Silicon Nitride Ceramic ◽  
Cold Compaction

Densification Behavior of Ceramic Powder Under Cold Compaction

1998 ◽  
Vol 122 (2) ◽  
pp. 238-244 ◽  
Author(s):  
K. T. Kim ◽  
S. W. Choi ◽  
H. Park
Keyword(s):  
Experimental Data ◽  
Finite Element ◽  
Triaxial Compression ◽  
Ceramic Powder ◽  
Densification Behavior ◽  
Zirconia Powder ◽  
Cold Compaction ◽  
Proposed Model ◽  
Die Compaction ◽  
Cap Model

Densification behavior of ceramic powder under cold compaction was investigated. Experimental data were obtained for zirconia powder under triaxial compression with various loading conditions. For densification of ceramic powder during cold compaction, a novel hyperbolic cap model was proposed from the iso-density curves based on experimental data of zirconia powder under triaxial compression. The proposed model was implemented into a finite element program (ABAQUS) to study densification behavior of zirconia powder under die compaction. The modified Drucker–Prager/cap model was also employed to compare with experimental data and the finite element results from the proposed model in the present work. By including the effect of friction between the powder and die wall, density distributions of a zirconia compact were measured and compared with finite element results under die compaction. [S0094-4289(00)00102-X]

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.

Sintered silicon nitride/nano-silicon carbide materials based on preceramic polymers and ceramic powder

2012 ◽  
Vol 32 (9) ◽  
pp. 1893-1899 ◽  
Author(s):  
Ulrich Degenhardt ◽  
Frank Stegner ◽  
Christian Liebscher ◽  
Uwe Glatzel ◽  
Karl Berroth ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
Silicon Nitride ◽  
Ceramic Powder ◽  
Preceramic Polymers ◽  
Nano Silicon ◽  
Sintered Silicon

Chemical interaction between Fe and silicon nitride ceramic

1997 ◽  
Vol 17 (1) ◽  
pp. 25-31 ◽  
Author(s):  
E. Heikinheimo ◽  
I. Isomäki ◽  
A.A. Kodentsov ◽  
F.J.J. van Loo
Keyword(s):  
Silicon Nitride ◽  
Chemical Interaction ◽  
Silicon Nitride Ceramic

Characterization of hole taper in laser drilling of silicon nitride ceramic under water

2018 ◽  
Vol 44 (11) ◽  
pp. 13449-13452 ◽  
Author(s):  
Qiang Chen ◽  
Hong-Jian Wang ◽  
Dong-Tao Lin ◽  
Fei Zuo ◽  
Zhuang-Xin Zhao ◽  
...  
Keyword(s):  
Silicon Nitride ◽  
Laser Drilling ◽  
Silicon Nitride Ceramic
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