High Temperature Wear Behaviors of TiAl-TiB2 Composites
High Temperature Wear Behaviors of TiAl-TiB2 Composites
复制标题
TiAl-TiB2复合材料的高温磨损行为
DOI：
10.1007/s11249-017-0924-7
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发表时间：
2017
影响因子：
3.2
通讯作者：
Liu Weimin
中科院分区：
文献类型：
--
作者：
Wang Long;Cheng Jun;Zhu Shengyu;Yu Yuan;Qiao Zhuhui;Yang Jun;Liu Weimin
研究了热压烧结法制备的原位合成TiB2增强TiAl基复合材料在室温至800℃范围内的干滑动摩擦学行为。结果表明，在所有试验温度下，TiB2颗粒的加入均能提高TiAl合金的高温耐磨性，且TiB2增强相含量越多，其耐磨性越好。这种改善在600℃及以上更为显著，尤其是对于体积分数为40%TiB_2的复合材料，其磨损率在600℃和800℃时比TiAl低4~10倍，相应地，磨损机制由中低温(RT，200和400℃)的磨粒磨损向高温(600和800℃)的氧化磨损转变。除了材料的脆韧转变和氧化层的形成外，Al_2O_3和TiO_2的相变可能是材料具有良好的高温耐磨性的部分原因。
In this article, the dry-sliding tribological behaviors of TiAl-based composites reinforced with 20 and 40 vol% in situ synthesized TiB2produced by a hot-press sintering process were investigated from room temperature (RT) to 800 °C. The results show that the high-temperature wear resistance of the TiAl alloy is improved by adding the TiB2particles under all the testing temperatures, and the more the TiB2reinforcement, the better the wear resistance is. This improvement is more significant at 600 °C and above, especially for the composite with 40 vol% TiB2, whose wear rate is 4–10 times lower than TiAl at 600 and 800 °C. Accordingly, the wear mechanisms transfer from abrasion wear at low and moderate temperature (RT, 200 and 400 °C) to oxidation wear at high temperature (600 and 800 °C). In addition to the brittle-to-ductile transition of the materials and oxide layer formation, the phase transition of Al2O3and TiO2may be partly responsible for the promising wear resistance at high temperatures.