Compressive creep of Si3N4/MgO alloys期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

Compressive creep of Si3N4/MgO alloys

Authors:	F F Lange B I Davis D R Clarke

Affiliation:	(1) Rockwell International Science Center, 91360 Thousand Oaks, California, USA

Abstract:	The compressive creep behaviour of four compositions within the Si₃N₄-Mg₂SiO₄-Si₂N₂O compatibility triangle were studied in air at 1400° C. Strain rate ( $\dot \varepsilon$ ) versus stress () was analysed to determine the stress exponent, n ( $\dot \varepsilon = A\sigma ^n$ ). Cavitation during creep was determined by precise (sink-float) density measurements. Compositions close to the Si₃N₄-Si₂N₂O tie line exhibited no cavitation and had n1, whereas compositions close to the Si₃N₄-Mg₂SiO₂ tie line exhibited extensive cavitation and had n2. Test results are interpreted in terms of the volume fraction of the viscous phase present.

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