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Preparation of Titanium Nitride/Alumina Laminate Composites
Author(s) -
Zhang JingXian,
Huang ZhengRen,
Jiang DongLiang,
Tan Shouhong H.,
Shen Zhijian,
Nygren Mats
Publication year - 2002
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.2002.tb00234.x
Subject(s) - materials science , tin , composite material , fracture toughness , titanium nitride , slurry , microstructure , sintering , indentation , spark plasma sintering , scanning electron microscope , ceramic , nitride , metallurgy , layer (electronics)
A preparation route for TiN/Al 2 O 3 laminate composites has been described. A water‐based process using Al 2 O 3 and TiN slurries with solids contents of 40 and 35 vol%, respectively, was used to make TiN and Al 2 O 3 tapes. The removal of the binder was monitored by weight‐loss measurements in a thermogravimetry unit. Bodies composed of Al 2 O 3 and TiN tapes were densified at temperatures of 1400° and 1500°C using the Spark Plasma Sintering ® (SPS) technique. Densities of >98% of the theoretical densities were approached. Crack‐free and almost fully densified TiN/Al 2 O 3 compacts were prepared by heating the burned‐out green bodies to the final sintering temperature (1500°C) at a rate of 100°C/min, and with a holding time of 5–10 min, under a pressure of 75 MPa. The microstructures of the obtained compacts were studied using scanning electron microscopy. Grain sizes in the sintered Al 2 O 3 and TiN compacts were similar to those of the precursor powders. Hardness and indentation fracture toughness were measured at room temperature, and the monolithic compacts as well as the laminate composites exhibited anisotropic mechanical behavior; i.e., the cracks propagated much more easily in a direction parallel to the laminas than perpendicular to them.