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Superfast Densification of Oxide Ceramics by Spark Plasma Sintering

GAO Lian; HONG Jin-Sheng(State Key Lab on High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences Shanghai 200050 China) MIYAMOTO Hiroki; EIAZ DE LA ;TORRE Sebastian(Technology Research Institute  
The SPS (Spark Plasma Sintering) Process is a new materials synthesis procussing techllology recently developed by Sumitomo Coal Mining Co.Ltd.. Japan. Some oxides such as Al2O3, Y-TZP,YAG, Al2O3-ZrO2 and Mullite were successfully superfast densified by SPS under the conditions of heating rate as high as 600℃/min, no keeping time at the sintering temperatures above 1200℃,and thed fast cooling to 600℃ within 3 minutes. The superfast sintering samples show high densities, fine inicrostructures and excellent mechanical properties. The fracture toughness K1c of 20mol% Al2O3-ZrO2 (3Y) samples sinterse by SPS at 1250℃ for 2 min is higher than 6MPa.m1/2.The reaction sintering of ZrO2- mullitc could be completed by SPS at 1530℃ for 3 min.
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