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Processing-RelatedFractureOrigins: 111, Differential Sinteringof Zr02Agglomeratesin A1203/Zr02Composite
 

Summary: Processing-RelatedFractureOrigins: 111, Differential Sinteringof
Zr02Agglomeratesin A1203/Zr02Composite
F.F. LANGE* and B.I. DAVIS
Rockwell International Science Center, Thousand Oaks, California 91360
I.A. AKSAY"
Department of Materials Science and Engineering, University of California, Los Angeles, California 90024
Large, hard ZrOz agglomerates remained in an AI2O3/ZrO2
composite suspension after inefficient ball-milling. The
ZrOz agglomerates shrank away from the consolidated
A1,03/Zr02powder matrix during sintering, producing crack-
like voids which were responsible for strength degradation.
I. Introduction
T WAS previously demonstrated that dry powder routes to pow-
Ider consolidation can produce large agglomerates which result
in large cracklike voids due to differential sintering. In dry powder
routes, soft agglomerates are apparently formed either by the
spontaneous attraction of particles due to van der Waals forces or
by particle cohesion due to surface-tension effects produced by
absorbed, atmospheric water. It was also demonstrated that the
colloidal/filtration route (commonly known as slip casting) to pow-

  

Source: Aksay, Ilhan A. - Department of Chemical Engineering, Princeton University

 

Collections: Materials Science