A numerical study on stresses in graded multilayers during sintering and cooling

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2 Citations (Scopus)

Abstract

Effects of material properties and layered structures on internal stress generation in metal/ceramic graded powder compacts during firing process, which can be the cause of cracking, are studied by numerical analysis. Nonlinear variation of the sintering rate or the thermal shrinkage through the layers, due to mixing different materials, generates tensile internal stresses on the surface of the top ceramic layer. To extinguish the tensile stresses in both sintering and cooling periods together by adjusting the graded structure, a way of modifying the sintering properties is clarified. The multilayer is converted into the equivalent, essential three layers on calculation, for ease. Decreasing tensile bending stress and increasing compressive mismatch stress on the surface, by relatively gaining the sintering rate as well as the thickness of the middle layer, can be a solution for surface cracking during sintering, and may not conflict with design for thermal stress relief.

Original languageEnglish
Pages (from-to)358-363
Number of pages6
JournalJSME International Journal, Series A: Solid Mechanics and Material Engineering
Volume48
Issue number4
DOIs
Publication statusPublished - Apr 15 2006

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Multilayers
Sintering
Cooling
Tensile stress
Residual stresses
Stress relief
Cermets
Thermal stress
Powders
Numerical analysis
Materials properties

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanical Engineering

Cite this

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abstract = "Effects of material properties and layered structures on internal stress generation in metal/ceramic graded powder compacts during firing process, which can be the cause of cracking, are studied by numerical analysis. Nonlinear variation of the sintering rate or the thermal shrinkage through the layers, due to mixing different materials, generates tensile internal stresses on the surface of the top ceramic layer. To extinguish the tensile stresses in both sintering and cooling periods together by adjusting the graded structure, a way of modifying the sintering properties is clarified. The multilayer is converted into the equivalent, essential three layers on calculation, for ease. Decreasing tensile bending stress and increasing compressive mismatch stress on the surface, by relatively gaining the sintering rate as well as the thickness of the middle layer, can be a solution for surface cracking during sintering, and may not conflict with design for thermal stress relief.",
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