Preparation, microstructure and properties of MgSiN2 ceramics

W.A. Groen, M.J. Kraan, G. With, de

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Abstract

The synthesis of MgSiN2 powder, starting from the metal nitrides, is described. The powder is resistant against oxidn. in air up to 800 DegC. From the prepd. powder, fully dense MgSiN2 ceramics can be sintered at 1550 DegC. The samples were sintered in a closed Mo vessel to prevent evapn. of magnesium nitride. Phase compn., chem. properties and the mech. properties of the as-prepd. ceramics are described. The ceramics are oxidn. resistant in air at least up to 920 DegC. The thermal cond. at room temp. is estd. at 17 W/m K. A reasonable strength of 270 MPa and a rather good fracture toughness of about 4.3 MPa-m1/2 are obtained. A hardness of about 15 GPa and a Young's modulus of 235 GPa have been measured. Considerable improvement in properties is expected when the processing conditions, well within reach, are optimized. [on SciFinder (R)]
Original languageEnglish
Pages (from-to)413-420
JournalJournal of the European Ceramic Society
Volume12
Issue number5
DOIs
Publication statusPublished - 1993

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