Evaluation of Creep Property of AS800 Silicon Nitride from As-Processed Surface Regions.

Lin, H. T.

Technical Information Center Oak Ridge Tennessee

关键词: Creep;    Silicon nitrides;    Surface;    Tensile properties;    Performance;   

RP-ID  :  DE2001777690

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

Tensile creep studies were carried out to evaluate the creep performance of AS800 silicon nitride samples extracted from the surface and bulk regions of as-processed billets at 1350 C in air. The objective of this study was to understand the creep properties of the silicon nitride in the as-processed surface region and determine if they are comparable to those obtained from the bulk region. The results indicated that samples from the as-processed surface region exhibited higher creep rates and shorter lifetimes as compared with those obtained from the bulk region. The poor creep performance of material from the as-processed surface region was due to the higher content of glassy phase enriched with oxygen and sintering additive elements.