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Ablation‐Resistance of Combustion Synthesized TiB 2 –Cu Cermet
Author(s) -
Zhang XingHong,
Han JieCai,
He XiaoDong,
Yan Cheng,
Wang BaoLin,
Xu Qiang
Publication year - 2005
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.1551-2916.2004.00005.x
Subject(s) - materials science , composite material , copper , thermal shock , ceramic , fracture toughness , cermet , metallurgy , titanium , combustion , composite number , molybdenum , chemistry , organic chemistry
TiB 2 –Cu ceramic–metal composites were prepared by combustion synthesis of elemental titanium, boron, and copper powders. The synthesized product consisted of two phases: TiB 2 and copper. The addition of copper improved the strength and fracture toughness, thermal expansion coefficient, and thermal conductivity of TiB 2 . Thermal shock and ablation resistances of TiB 2 –Cu composites were studied using a plasma torch arc heater. Monolithic TiB 2 failed catastrophically when the plasma arc flow reached the specimen surface. However, no cracks were found on the ablation surface of the TiB 2 –Cu ceramic–metal composites. The fractional mass loss was 4.09% for a TiB 2 –40Cu composite, which was close to the traditional W/Cu alloys. Volatilization of metal binder and mechanical erosion of TiB 2 were observed to be the major ablation mechanisms. An ablation process model is proposed for the TiB 2 –Cu composites.