SiC Platelet Reinforced Al₂O₃ Composites by Free Sintering of Coated Powders
Wachtman, John B.
SiC platelets were coated with the required thickness of fine-grained Al2O3 powder by controlled heterogeneous precipitation from a solution. after calcination, the coated platelets were compacted and sintered at a constant heating rate of 5 °C/min in a helium atmosphere. the parameters which control the coating process and the sintering behavior of the coated platelets are outlined. Starting with an initial matrix density of 40-45% of the theoretical, composites containing ≈20 vol% platelets reached nearly full density after sintering at 1800 °C for 30 minutes. by comparison, similar composites formed by mechanical mixing of the SiC platelets and the precipitated Al2O3 powder reached a density of only ≈70 % of the theoretical under identical sintering conditions.
X. Yang and M. N. Rahaman, "SiC Platelet Reinforced Al₂O₃ Composites by Free Sintering of Coated Powders," Ceramic Engineering and Science Proceedings, Wiley-Blackwell, Jan 1994.
The definitive version is available at http://dx.doi.org/10.1002/9780470314555.ch14
18th annul conference on Composites and Advanced Ceramic Materials
Materials Science and Engineering
Keywords and Phrases
SiC Platelets; Coated Platelets; Constant Heating Rate; Controlled Heterogeneous Precipitation; Calcination
Article - Journal
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