Investigation of Si3N4-TiN/Si3N4-Si3N 4 trilayer composites with residual surface compression

Jow Lay Huang, Feng Chi Chou, Horng Hwa Lu

研究成果: Article同行評審

11 引文 斯高帕斯(Scopus)

摘要

The present study involved the fabrication of three-layered composites consisting of outer layers that contained Si3N4 and an inner layer that contained TiN in a Si3N4 matrix. Surface compressive stresses were developed upon cooling due to the relatively higher thermal expansion coefficient (CTE) in the inner layer. The flexural strength of layered Si3N4 composites was substantially greater than that of monolithic Si3N4. This was attributed to the surface compressive stress. The effects of TiN composition and inner layer thickness on the mechanical properties were investigated. Layered samples containing 20 vol. % TiN had lower flexural strength than Si3N4-10% TiN/Si3N4-Si3N4 due to the formation of microcracks in the inner layer. Crack behaviors in layered samples were affected by the residual stress, interface, and free sample surface. Both theoretical and experimental results indicated that the strength and toughness of layered composites were substantially greater than those of monolithic materials. The determination of fracture toughness in three-layered materials by the surface indentation technique should be done carefully due to the influence of residual stress.

原文English
頁(從 - 到)2357-2365
頁數9
期刊Journal of Materials Research
12
發行號9
DOIs
出版狀態Published - 1997 7月 1

All Science Journal Classification (ASJC) codes

  • 材料科學(全部)
  • 凝聚態物理學
  • 材料力學
  • 機械工業

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