Effect of TiH2 in the preparation of MMC Ti based with TiC reinforcement
Effect of TiH2 in the preparation of MMC Ti based with TiC reinforcement
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DOI：
10.1016/j.jallcom.2014.09.014
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发表时间：
2015-01
影响因子：
6.2
通讯作者：
N. Peillon;J. Fruhauf;S. Gourdet;J. Féraille;S. Saunier;C. Desrayaud
中科院分区：
文献类型：
--
作者：
N. Peillon;J. Fruhauf;S. Gourdet;J. Féraille;S. Saunier;C. Desrayaud
对金属基复合材料的制备进行了大量的研究，文献中报道了各种各样的工艺。对于钛基MMC，这些细化技术的基础材料主要是雾化钛粉。本文采用氢化钛粉末制备Ti/TiC MMC。虽然需要额外的脱氢操作，但这种基粉的烧结温度有望显著降低。在此背景下，研究了掺入0、10%和20%体积% TiC增强剂的氢化钛粉末在自由烧结致密化过程中的行为。讨论了粒度、温度和烧结增强速率对烧结增强性能的影响。采用10体积%的增强剂，对tih2h工艺与Ti HDH（氢化物脱氢）和雾化Ti混合物进行了比较。结果表明，使用氢化物可以降低烧结温度，提高烧结密度。脱氢和烧结机制之间的相互作用在较高的烧结温度速率（10°C/min）下明显出现，需要特别注意防止孔隙核的形成。
Many studies were carried out on the elaboration Metal Matrix Composites (MMCs) and a wide variety of process is reported in the bibliography. For titanium based MMC, the basis material for these elaboration techniques mainly consists of atomized titanium powder.In this work a titanium hydride powder is used to elaborate Ti/TiC MMC. Although an additional dehydrogenation operation is required a significant decrease of the sintering temperature is expected with this basis powder. In this context, the behavior of titanium hydride powder mixed with 0, 10 and 20 vol.% TiC reinforcement is studied during densification by free sintering. The effects of particle size, temperature and rate of sintering reinforcement are discussed. The comparison of the TiH2process with Ti HDH (Hydride Dehydride) and atomized Ti mixture is made with 10 vol.% reinforcement. The results indicate that the sintering temperature is lowered and the final densities achieved are higher if the hydride is used. Interactions between dehydrogenation and sintering mechanisms clearly appear for the higher sintering temperature rate (10 °C/min) and need specific attention to prevent porosity nucleation through hydrogen entrapment.