Improvement of the oxidation resistance of TiAl alloys by using the chlorine effect
Improvement of the oxidation resistance of TiAl alloys by using the chlorine effect
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DOI：
10.1016/s0921-5093(97)00675-8
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发表时间：
1997-12-01
期刊：
影响因子：
6.4
通讯作者：
Hald, M
中科院分区：
文献类型：
--
作者：
Schutze, M;Hald, M
大多数TiAl合金由于在800℃以上的空气中抗氧化能力不足而缺乏抗氧化能力。最近发现，在合金中加入少量的Cl可以显著提高合金的抗氧化能力。然而，造成这种影响的机制尚不清楚。本文报道了用P/M法或离子注入法或PVD法将Cl作用于TiAl合金表面的氧化实验。研究结果表明，cl效应是由于挥发性金属氯化物的形成。结果表明，在一定的cl -范围内，氯对材料的抗氧化性能有一定的促进作用，并通过热力学计算加以量化。认为cl效应对提高TiAl合金的抗氧化性能具有重要的潜力。(C) 1997 Elsevier Science S.A.
Most TiAl alloys lack from their insufficient oxidation resistance in air at temperatures above 800 degrees C. Recently it has been found that small amounts of Cl in the alloy may significantly improve the oxidation resistance. However, the mechanisms responsible for this effect were not yet understood. In the paper oxidation experiments with TiAl alloys are reported where Cl was alloyed to the material by the P/M route or applied to the material surface either by ion implantation or by PVD. The results of the investigations revealed that the Cl-effect is due to the formation of volatile metal chloride species. It is shown that chlorine can have a beneficial effect on oxidation resistance in a certain Cl-range which is quantified by thermodynamic calculations. It is assumed that the Cl-effect offers a significant potential for improvement of the oxidation resistance of technical TiAl alloys. (C) 1997 Elsevier Science S.A.