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论文类型： 期刊论文

发表时间： 2011-09-01

发表刊物： JOURNAL OF ALLOYS AND COMPOUNDS

收录刊物： Scopus、SCIE、EI

卷号： 509

期号： 35

页面范围： 8688-8691

ISSN号： 0925-8388

关键字： AlN ceramics; Yttrium nitrate; Mechanical properties; Interfacial bonding

摘要： Aluminum nitride (AlN) ceramics were prepared by hot-pressing with Y(NO(3))(3)center dot 6H(2)O as sintering additive. The mechanical properties including flexural strength, Vickers' hardness, and fracture toughness were studied. The relative density and mechanical property of the monolithic AlN were improved by adding Y(NO(3))(3)center dot 6H(2)O, which decreased the porosity. At 2 wt% Y(2)O(3), the AlN ceramic exhibited the highest strength of 383 MPa, the highest hardness of 15.39 GPa, and the highest fracture toughness of 3.1 MPa m(1/2). However, doping with more additive, the strength, hardness, and toughness of AlN ceramics decreased because of the weak interfacial bonding between AlN matrix and the yttrium aluminates phase. (C) 2011 Elsevier B.V. All rights reserved.