Reaction sintering fabrication of (AlN, TiN)–Al₂O₃ composite

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• 作者：Hongyu ; Gong ; Yansheng ; Yin ; Aiju ; Li ; Yingcai ; Liu ; Yuhua ; Zhen ; Chunsheng ; Li
• 关键词：A. Composites ; A. Oxides ; A. Nitrides ; D. Mechanical properties
• 刊名：Materials Research Bulletin
• 出版年：2002
• 期刊代码：60_00255408
• 类别：ms
• 出版时间：August 8, 2002
• 卷：37
• 期：9
• 页码：1603-1611
• 文件大小：387 K

摘要

The (AlN, TiN)–Al₂O₃ composites were fabricated by reaction sintering powder mixtures containing 10–30wt.%(Al, Ti)–Al₂O₃ at 1420–1520°C in nitrogen. It was found that the densification and mechanical properties of the sintered composites depended strongly on the Al, Ti contents of the starting powder and hot pressing parameters. Reaction sintering 20wt.%(Al, Ti)–Al₂O₃ powder in nitrogen in 1520°C for 30min yields (AlN, TiN)–Al₂O₃ composites with the best mechanical properties, with a hardness HRA of 94.1, bending strength of 687MPa, and fracture toughness of 6.5MPam^1/2. Microstructure analysis indicated that TiN is present as well dispersed particulates within a matrix of Al₂O₃. The AlN identified by XRD was not directly observed, but probably resides at the Al₂O₃ grain boundary. The fracture mode of these composites was observed to be transgranular.