Thermomechanical behavior of TiB sub 2 -AlN composites

The compaction at 1900 deg C of commercially available powders (aluminum nitride AlN and titanium diboride TiB sub 2 ), under an isostatic argon pressure of 195 MPa, has led to the formation of dense composites (d sub r 99%). Various grades of powders were used for this study. The composite obtained...

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Bibliographic Details
Published in:Key engineering materials 1997-06, Vol.132-136 (1), p.524-527
Main Authors: Schneider, S V, Desmaison-Brut, M, Richter, G, Porz, F, Gault, C
Format: Article
Language:English
Online Access:Get full text
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Summary:The compaction at 1900 deg C of commercially available powders (aluminum nitride AlN and titanium diboride TiB sub 2 ), under an isostatic argon pressure of 195 MPa, has led to the formation of dense composites (d sub r 99%). Various grades of powders were used for this study. The composite obtained by mixing the finest grain powders at the composition 75 mol.% of TiB sub 2 and 25 mol.% of AlN, has a Vickers microhardness of 3862plus/minus638, a strength of 623plus/minus60 MPa and a toughness of 5.6plus /minus0.2 MPa.root m. By heating the material up to 1000 deg C, it was not possible to detect any creep deformation. In the other method, a constant increase of the Young's moduli and of the thermal expansion coefficients has been observed with the increase of the TiB sub 2 content.
ISSN:1013-9826