In-situ HIP synthesis of TiB2/SiC ceramic composites

Citation
Dg. Zhu et al., In-situ HIP synthesis of TiB2/SiC ceramic composites, J MATER PR, 90, 1999, pp. 457-461
Citations number
7
Categorie Soggetti
Material Science & Engineering
Journal title
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
ISSN journal
09240136 → ACNP
Volume
90
Year of publication
1999
Pages
457 - 461
Database
ISI
SICI code
0924-0136(19990519)90:<457:IHSOTC>2.0.ZU;2-L
Abstract
Dense TiB2/SiC ceramic composites were fabricated by means of in-situ HIP s ynthesis processing from TiH2, Si, C and B4C powder blends. The microstruct ure and mechanical properties of the ceramic matrix composites were investi gated using X-ray diffraction, optical microscopy, scanning electron micros copy, transmission electron microscopy and microhardness. The grains of TiB 2 and SiC in the ceramic matrix composites are fine, the TiB2 grains being regular-platelet, and the SiC grains being irregular polygon. The mechanica l properties of the composite are mainly affected by their densities. As th e density increases, the properties of the composites improve. The microhar dness, fracture toughness K-IC and flexural strength are, respectively, 14. 80 GPa, 4.75 MPa m(1/2) and 408.62 MPa in the 96% density. TiB2/SiC composi tes. The crack propagation path is deflected in these composites. TiB2/SiC composites also have an excellent oxidation resistance. The average oxidati on rate of TiB2/SiC is about 10(-10) m s(-1) from 1073 to 1473 K. (C) 1999 Elsevier Science S.A. All rights reserved.