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Textures and microstructures v.24 no.1/3, 1995년, pp.43 - 52  

Texture and Microstructure Development in Al2O3-Platelet Reinforced Ce-ZrO2/Al2O3 Laminates Produced by Centrifugal Consolidation

Roeder, Ryan K. (School of Materials Engineering, Purdue University, West Lafayette, IN 47907, USA ) ; Bowman, Keith J. (School of Materials Engineering, Purdue University, West Lafayette, IN 47907, USA ) ; Trumble, Kevin P. (School of Materials Engineering, Purdue University, West Lafayette, IN 47907, USA ) ;
  • 초록  

    A dispersed, low-solids-fraction suspension containing Ce-ZrO2 , fine Al2 O3 and 5 vol% Al2 O3 -platelets was segregated using centrifugal consolidation to produce functionally gradient laminates (FGLs). Platelet alignment facilitated efficient packing of highly anisometric platelets to high densities. The complexity and anisotropy of the microstructure warrants a quantitative analysis of the microstructural evolution prior to any property evaluation. Quantitative image analysis was used to examine changes in the volume fraction, dimensional anisotropy, and gradient of pores and platelets with sintering time. In all cases, special attention was given to the effects of texture during microstructural evolution. Platelet alignment enhanced densification via anisotropic shrinkage, overcoming constraint that otherwise inhibits densification in platelet-containing materials. Also, platelet alignment and microstructural design were used to initiate and control anisotropic grain growth. Platelet growth (at the expense of smaller particles of the same phase) during annealing promoted further phase segregation and produced higher platelet content composites consisting of larger platelets, without having to consolidate high contents of large platelets.


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