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Indexed by:期刊论文

Date of Publication:2011-09-01

Journal:JOURNAL OF ALLOYS AND COMPOUNDS

Included Journals:Scopus、SCIE、EI

Volume:509

Issue:35

Page Number:8688-8691

ISSN No.:0925-8388

Key Words:AlN ceramics; Yttrium nitrate; Mechanical properties; Interfacial bonding

Abstract: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.