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TiB2-Cu-Ni梯度功能材料的抗烧蚀行为
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TB33

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教育部博士点基金(20020213037)及航天创新基金


Ablation Behaviour of Titanium Diboride-Copper-Nickle FGM
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    摘要:

    采用燃烧合成与同时致密化技术制备了TiB2-Cu-Ni5层金属-陶瓷梯度功能材料。利用扫描电镜(SEM)、电子探针(EPMA)等方法对梯度材料的成分及烧蚀前后的微观组织形貌等进行了检测,用等离子火炬电弧加热器对材料进行加热来考察梯度材料的抗热震性能以及抗烧蚀性能。结果表明,梯度功能材料各层之间的界线已经模糊,层与层之间的结合较好;梯度材料在瞬间加热时和瞬间冷却时均未出现崩裂,烧蚀后表面没有裂纹产生,说明该梯度材料具有优异的抗热震性能;烧蚀20S后,梯度功能材料烧蚀后的质量损失仅为0.5g,说明梯度功能材料具有良好的抗烧蚀性能。梯度材料的抗烧蚀机理为金属粘接剂的挥发损失、热化学烧蚀和机械冲刷。该梯度材料在固体火箭发动机的喷管、喉衬等部件上有广阔的应用前景。

    Abstract:

    TiB2-Cu-Ni five-layer metal-ceramic functionally graded material (FGM) was produced by self-propagating high- temperature synthesis (SHS) under the conditions of pseudo hot isostatic pressing (PHIP). The microstructure and composition of the FGM before and after test were examined by SEM and EPMA etc. The FGM was heated for 20 seconds by plasma torch arc heater to investigate thermal shock resistance and ablation behaviour. The results show that the stacked interface between layer and layer of FGM is obscure, which shows that the bonding between layer and layer is good. The FGM did not burst apart when the surface temperatures of FGM increased and went down drastically in a very short moment. Moreover, no apparent cracks were found on the ablation surface of FGM. These results show that the thermal shock resistance of FGM is excellent. The mass loss of FGM after ablation test is only 0.5 g, which shows that the resistance to ablation and erosion of FGM is good. The ablation mechanisms of the material are volatilization of metal binder, hot chemical ablation and mechanical erosion. This FGM can be used widely as nozzle and throat in the solid rocket motor.

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徐强 张幸红 韩杰才 赫晓东 VL.Kvalin. TiB2-Cu-Ni梯度功能材料的抗烧蚀行为[J].稀有金属材料与工程,2004,33(10):1072~1075.[Xu Qiang, Zhang Xinghong, Han Jiecai, He Xiaodong, V. L. Kvanin. Ablation Behaviour of Titanium Diboride-Copper-Nickle FGM[J]. Rare Metal Materials and Engineering,2004,33(10):1072~1075.]
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  • 最后修改日期:2003-06-17
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