High strength B4C-TiB2 composites fabricated by reaction hot-pressing

B4C based composites with 20 mol% TiB2 were fabricated by reaction hot-pressing of four different submicron size B4C powders with the addition of nanometre size TiO2 and C powders at 2000 C, and their mechanical properties were examined. A B4C-TiB2 composite with both high strength of 866 MPa and mo...

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Bibliographic Details
Published inJournal of the European Ceramic Society Vol. 23; no. 7; pp. 1123 - 1130
Main Authors YAMADA, Suzuya, HIRAO, Kiyoshi, YAMAUCHI, Yukihiko, KANZAKI, Shuzo
Format Journal Article
LanguageEnglish
Published Oxford Elsevier 01.06.2003
Subjects
Applied sciences
Building materials. Ceramics. Glasses
Ceramic industries
Chemical industry and chemicals
Exact sciences and technology
Structural ceramics
Technical ceramics
Mechanical properties
Dispersion reinforced material
Experimental study
Composite material
Non oxide ceramics
Structural ceramic
Fracture toughness
Reaction sintering
Bending strength
Hot pressing
Boron Carbides
Titanium Borides
Manufacturing
Microstructure
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Summary:B4C based composites with 20 mol% TiB2 were fabricated by reaction hot-pressing of four different submicron size B4C powders with the addition of nanometre size TiO2 and C powders at 2000 C, and their mechanical properties were examined. A B4C-TiB2 composite with both high strength of 866 MPa and modest fracture toughness of 3.2 MPa.m1/2 could be obtained using B4C powder with a mean particle size of 0.50 micron and total metal impurity 0.3-0.5 wt% (Al + Fe). It seems that this extremely high strength is attributed to the fine-grained B4C microstructure, uniform dispersion of TiB2 particles and improvement of fracture toughness. 24 refs.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0955-2219
1873-619X
DOI:10.1016/s0955-2219(02)00274-1