Crystallization of Zirconium Nitride in Silicon Nitride Ceramics with Nitrogen Pressures and Sintering Additives

S.M. Lee; K.H. Park; Jung Whan Yoo; Hyung Tae Kim

doi:10.4028/www.scientific.net/KEM.287.253

Paper Titles

Synthesis of Porous MoSi₂ Material Fabricated by SHS (Self-Propagating High Temperature Synthesis) Process
p.226

Macro- to Atomic-Scale Tailoring of Si₃N₄ Ceramics to Enhance Properties
p.233

Effect of the Sintering Additives on the Microstructure and the Properties of Textured Silicon Nitride
p.242

Effect of Microstructure on Dielectric Properties of Si₃N₄ at Microwave Frequency
p.247

Crystallization of Zirconium Nitride in Silicon Nitride Ceramics with Nitrogen Pressures and Sintering Additives
p.253

Viscosities of Oxynitride Glass and the Effects on High Temperature Behaviour of Silicon Nitride-Based Ceramics
p.259

Grain Growth of β-Silicon Nitride in RE-Mg-Si-O-N Liquid
p.265

Microstructure and Properties of Sintered Reaction Bonded Silicon Nitride with Aligned Whisker Seeds
p.271

Fabrication and Properties of Porous RBSN
p.277

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Crystallization of Zirconium Nitride in Silicon Nitride Ceramics with Nitrogen Pressures and Sintering Additives

Abstract:

We investigated grain boundary crystallization of gas-pressure-sintered silicon nitride with zirconia and magnesia as sintering aids. Cation compositions were mostly uniform throughout the specimen however, ZrO2 was crystallized in the surface region, while ZrN in the inside. When the specimen was heat-treated at 1 atm nitrogen atmosphere, ZrO2 in the surface region transformed to ZrN. The transformation, however, was suppressed when alumina was incorporated as an additional sintering aid. Based on these results, we propose a model describing the reaction among Si3N4, SiO2, ZrO2, ZrN and N2. Observed microstructures and measured mechanical properties were consistent with the model.