Journal of Materials Science

, Volume 29, Issue 24, pp 6604–6610 | Cite as

Al2O3-5 wt% Al composites by ICP sintering of synthesized precursor

  • S. N. Sinha
  • S. H. Kim


Microstructure developments during the milling of Al2O3-5wt% Al composite powder in an attritor and subsequent sintering of the precursor by inductively coupled argon plasma are presented. After 4 h of milling the precursor contained tubular ceramic-metal and uniform ceramic regions. With an increase in the milling period the ceramic-metal regions broke into smaller and almost globular regions, and the smaller regions became dispersed in the ceramic regions. After 8 h of milling the composite powder had a stable microstructure and contained 0.25–0.35 μm clusters. The sintered composite was > 99.7% dense and its microstructure consisted of ceramic-metal regions which were dispersed in the matrix of a ceramic region. The sizes of ceramic grains in ceramic-metal regions and the ceramic regions were 0.3–2.2 and 0.8–1.8 μm, respectively. Many ceramic grains in ceramic-metal regions were separated by 30–100 nm wide metal layers. The microstructure of the ceramic-metal region showed many features of interpenetrating phase composites. The Knoop and Vickers microhardnesses of the composites at 5–10 N loads were 410–450. Under 10 N loads in Knoop and Vickers microhardness tests the crack length was 11±3 and 3 ± 0.5 μm, respectively. The crack propogation mechanisms in the indented areas are discussed.


Microstructure Milling Crack Length Metal Layer Composite Powder 
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Copyright information

© Chapman & Hall 1994

Authors and Affiliations

  • S. N. Sinha
    • 1
  • S. H. Kim
    • 1
  1. 1.CEMM DepartmentUniversity of Illinois at ChicagoChicagoUSA

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