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Sintering ZrO 2 /TiC Composites with TiH 2 : The Role of Transient Liquid Phase and of Substoichiometry
Author(s) -
Krell Andreas,
Blank Paul,
Pippel Eckhard,
Woltersdorf Jörg
Publication year - 1995
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.1151-2916.1995.tb08034.x
Subject(s) - materials science , sintering , relative density , microstructure , composite material , hot isostatic pressing , porosity , tetragonal crystal system , fracture toughness , grain size , amorphous solid , phase (matter) , cubic zirconia , ceramic , crystallography , chemistry , organic chemistry
Sintering tetragonal ZrO 2 with 35 vol% TiC results in a microstructure where all grain facets are free of amorphous interfaces independent of sintering aids as TiH 2 or MgO/ Y 2 O 3 ; grain sizes are below 1 μm. With substoichiometric TiC 1‐x , a relative density of 95% and closed porosity are obtained at a lower sintering temperature than with stoichiometric TiC, but subsequent cladless hot isostatic pressing (HIP) is required to achieve 99% density. High densities of 98% accompanied by good mechanical properties become possible by pressureless sintering with the use of TiH 2 . MgO/Y 2 O 3 doping also promotes densification, but results in less transformable zirconia and increases the number and size of amorphous triple junctions. The consequences are a lower fracture toughness and strength.