Mukerji, Joydeb and Biswas, S K (1990) Synthesis, properties, and oxidation of alumina titanium nitride composites. Journal of the American Ceramic Society, 73 (1). pp. 142-145. ISSN 0002-7820

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AlZ03-TiN composites varying from 60 to 66.6 mol% TiN were prepared by an in situ reaction between Ti02 and AlN. NZ or O2 evolution takes place, depending on the composition selected. A pseudobrookite (PB) phase appears in the reaction product, the amount decrasing; as the Ti02 : AlN ratio becomes poor in AlN. The in situ reaction product can be pressureless sintered to 94% to 97% theoretical density at 1600°C in N2. The four-point flexural strength varies from 280 to 430 MPa at room temperature. Tlhe fracture toughness is 3 to 4.7 MPa - ml". Oxidation of a 94% dense TiN-A1203 composite in the temperature range 710" to 1050°C was also studied. A layer of Ti02 (rutile) protects the composite at 710°C from further oxidation with a weight gain of 0.08 mg/cm2 in 90 min. In the temperature range 820" to 1O5O0C, the initial oxidation kinetics are parabolic, with an activation energy of 216.5 kJ/mol. Linear oxidation kinetics with an activation energy of 113.7 kJ/mol pertain at longer times.

Item Type: Article
Subjects: Engineering Materials
Depositing User: Bidhan Chaudhuri
Date Deposited: 02 Mar 2016 09:41
Last Modified: 02 Mar 2016 09:41

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