Strength Degradation Flaws in the Liquid-Phase-Sintered SiC Based Ceramics

Alexandra Kovalčíková; Ján Dusza; Pavol Šajgalík

doi:10.4028/www.scientific.net/KEM.409.350

Paper Titles

Modification of the Density-Pressure Relationship due to the Internal Friction and Cohesion of a Powder Mass Undergoing Closed Die Compaction
p.334

Mechanical and Fractographic Analyses of Monolithic Si₃N₄ Ceramics during Impact Testing
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The Fabrication and Properties of Biscuit-Sintered Y-TZP Ceramics for Dental Applications
p.342

Influence of Microstructure on Mechanical Response of Silicon Nitride Ceramic Composites in Nano-, Micro- and Macro-Volume of Material
p.346

Strength Degradation Flaws in the Liquid-Phase-Sintered SiC Based Ceramics
p.350

Observation of Thermophysical and Tribological Properties of CNT Reinforced Si₃N₄
p.354

Low Temperature Failure of Fe₇₆Ni₂Si₉B₁₃ Compacted from Amorphous Glass Powder
p.358

The Compressibility Behaviour of a New Generation of Coated Metal/Ceramic Composite Powders
p.362

Impedance Changes and Carbon Stability during the Heat Treatment of Si₃N₄–Carbon Composites
p.365

HomeKey Engineering MaterialsKey Engineering Materials Vol. 409Strength Degradation Flaws in the...

Strength Degradation Flaws in the Liquid-Phase-Sintered SiC Based Ceramics

Abstract:

The effect of the heat treatment on the fracture toughness and flexural strength of the silicon carbide – silicon nitride composites prepared by liquid-phase-sintering was investigated. The results were compared to those obtained for a reference silicon carbide material, prepared by the same fabrication route. The fracture toughness increased from 3.19 to 5.15 MPa.m1/2 due to the toughening mechanisms (crack deflection, mechanical interlocking, crack branching) occurring in the heat treated materials during the crack propagation. However, the flexural strength decreased after the heat treatment of the experimental materials. The strength of the investigated materials was degraded by the presence of processing flaws mainly in the form of pores, clusters of pores, and SiC agglomerates.

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Periodical:

Key Engineering Materials (Volume 409)

Pages:

350-353

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.409.350

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Online since:

March 2009

Authors:

Alexandra Kovalčíková, Ján Dusza, Pavol Šajgalík

Keywords:

Flaw, Fracture Toughness, Mechanisms of Toughening, Silicon Carbide (SiC), Strength

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