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Densification, Mass Loss, and Mechanical Properties of Low‐Temperature Pressureless‐Sintered Si 3 N 4 with LiYO 2 Additive: The Effects of Additive Content and Annealing
Author(s) -
Lee SeaHoon
Publication year - 2010
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/j.1744-7402.2009.02402.x
Subject(s) - materials science , annealing (glass) , microstructure , flexural strength , composite material , pressureless sintering , sintering , fracture toughness , residual stress , elastic modulus , modulus
The effects of annealing on the residual Li content, microstructure, and mechanical properties of pressureless‐sintered LiYO 2 –Si 3 N 4 were investigated. The bending strength and fracture toughness of the as‐fabricated specimens were fair (∼640 MPa, ), in spite of the sintering at a low temperature (1600°C). The strength, Young's modulus, and hardness were improved up to 697 MPa, 284 GPa, and 13.9 GPa, respectively, by annealing treatments. Residual Li could be reduced to 0.008 wt% by annealing at 1650°C in Ar. Si 3 N 4 could be sintered at a low temperature to give materials with a relatively low elastic modulus but reasonable strength values.