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Phase formation during sintering of nanocrystalline zirconia/stainless steel functionally graded composite layers

Dourandish, M ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1016/j.matlet.2010.10.077
  3. Abstract:
  4. Microstructural development and phase formation at the interface of yttria stabilized zirconia (3Y-TZP)/430L stainless steel composite layers produced by co-sintering method were studied by SEM, HRTEM, micro-focus XRD, and EPMA. Formation of a rich chromium boundary layer at the interface was noticed, which revealed Cr aggregation at the interface at the elevated temperatures. Misfit dislocations were also observed at the joint interface to tackle the mismatch crystallographic orientations between the ceramic and metal layer. The results of the micro-focus XRD showed formation of no new phases at the boundary zone. Microstructural studies also revealed a retarded grain growth in the nanostructured zirconia due to the pinning effect of ultrafine pores located at the grain-boundary junctions. The shear strength of the ceramic/metal joint was found to depend on the sintering atmosphere and varied in the range of 47-66 MPa
  5. Keywords:
  6. Nanostructured zirconia ; Boundary zones ; Ceramic/metal joint ; Co-sintering ; Crystallographic orientations ; Elevated temperature ; EPMA ; Functionally graded ; Grain boundary junctions ; Interface ; Joint interfaces ; Metal layer ; Micro-structural ; Microstructural development ; Misfit dislocations ; Nano-structured ; Nanocrystallines ; Phase formations ; Pinning effects ; SEM ; Sintering atmospheres ; Steel composites ; Ultrafine ; XRD ; Chromium ; Composite materials ; Grain growth ; Microstructure ; Phase interfaces ; Shear strength ; Sintering ; Stainless steel ; Yttrium alloys ; Zirconia ; Yttria stabilized zirconia
  7. Source: Materials Letters ; Volume 65, Issue 3 , February , 2011 , Pages 523-526 ; 0167577X (ISSN)
  8. URL: http://www.sciencedirect.com/science/article/pii/S0167577X10009481