질화규소의 기계적 성질 및 접촉 손상 : I. Alpa/Beta 상분율의 영향A Study on the Mechanical Properties and Contact Damage of Silicon Nitrides : 1. Effect of ${\alpha}/{\beta}$ Phase Fraction

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The effect of α/β phase on the mechanical properties and contact damage of silicon nitrides Si3N4) was investigated. Silicon nitride materials were prepared from two starting powders, at selective increasing hot-pressing temperatures to coarsen the microstructures: (i) from relatively coarse α-phase powder, essentially equiaxed α-Si3N4 grains, with limited, slow transformation to β-Si3N4 grain; (ii) from relatively fine α-phase powder, a more rapid transformation to β-Si3N4, with attendant grain elongation. The resulting micro-structure thereby provided a spectrum of α/β phase ratios, grain sizes, and grain shapes. Fracture strength, hardness, and toughness were measured, and contact damage and strength degradation after indentation were investigated by Hertzian indentation using spherical indenter. A brittle to ductile transition in Si3N4 depended on α/β phase ratio as well as grain size. Silicon nitride with elongated β grains showed a superior, contact damage resistance.
Publisher
한국분말야금학회
Issue Date
1998-01
Language
Korean
Citation

한국분말야금학회지, v.5, no.1, pp.15 - 22

ISSN
1225-7591
URI
http://hdl.handle.net/10203/75444
Appears in Collection
MS-Journal Papers(저널논문)
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