Ablation-resistance of combustion synthesized TiB2-Cu cermet
首发时间:2005-01-10
Abstract:TiB2-Cu ceramic-metal composites were prepared by combustion synthesis of elemental titanium, boron and copper powders. The synthesized product consisted of two phases: TiB2 and copper. The addition of copper improved the strength and fracture toughness, thermal expansion coefficient and thermal conductivity of TiB2. Thermal shock and ablation resistances of TiB2-Cu composites were studied using a plasma torch arc heater. Monolithic TiB2 failed catastrophically when the plasma arc flow reached the specimen surface. However, no cracks were found on the ablation surface of the TiB2-Cu ceramic-metal composites. The fractional mass loss was 4.09 % for a TiB2-40Cu composite, which was close to the traditional W/Cu alloys. Volatilization of metal binder and mechanical erosion of TiB2 were observed to be the major ablation mechanisms. An ablation process model is proposed for the TiB2-Cu composites.
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燃烧合成TiB2-Cu金属陶瓷的抗烧蚀行为
摘要:利用Ti, B, Cu粉通过燃烧合成制备了TiB2-Cu金属陶瓷复合材料,该金属陶瓷中只含有两相:TiB2陶瓷相和金属Cu相。金属Cu的添加可以提高TiB2陶瓷的强度、断裂韧性、热膨胀系数以及热导率;通过等离子电弧加热器考察了TiB2-Cu金属陶瓷的热冲击和抗烧蚀行为;结果表明:纯TiB2陶瓷在等离子电弧作用下发生灾难性破坏,而在TiB2-Cu金属陶瓷材料表面没有发现裂纹出现;TiB2-Cu金属陶瓷在等离子电弧作用下质量损失率为4.09%,这和传统的W/Cu合金烧蚀性能非常接近;TiB2-Cu金属陶瓷烧蚀机理是金属Cu的挥发以及TiB2陶瓷的机械剥蚀,在实验和理论分析基础上建立了材料的抗烧蚀模型。
关键词: TiB2-Cu金属陶瓷复合材料;燃烧合成 微观结构 热冲击 烧蚀机理
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No.1439164231105324****
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