Oxidation-resistant boron- and germanium-doped silicide coatings for refractory metals at high temperature
Oxidation-resistant boron- and germanium-doped silicide coatings for refractory metals at high temperature
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DOI：
10.1016/0921-5093(95)03342-4
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发表时间：
1995-02
期刊：
影响因子：
6.4
通讯作者：
B. Cockeram;R. Rapp
中科院分区：
文献类型：
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作者：
B. Cockeram;R. Rapp
由于钛合金在高温下抗氧化性差，需要一层保护涂层。将钛与足够的铝或硅合金化以形成保护性的al2o3或sio2鳞片并不是可行的方法。在这项研究中，硼和锗掺杂硅化物涂层生长在商业纯（CP）钛和正交基Ti-20Al-22Nb和Ti-22Al-27Nb合金通过卤化物活化，填充胶结的方法。采用空气等温和循环氧化测试在500-1000°C下评估涂层基底。制作显微硬度剖面以检测衬底的氧污染。这些涂层为CP Ti和TiAlNb合金提供了优异的抗氧化性能。
Owing to the poor oxidation resistance of titanium alloys at high-temperature, a protective coating is required. Alloying titanium with enough aluminum or silicon to form a protective Al2O3or SiO2scale is not a viable approach. In this study, boron- and germanium-doped silicide coatings were grown on commercially pure (CP) titanium and orthorhombic-base Ti-20Al-22Nb and Ti-22Al-27Nb alloys by a halide-activated, pack cementation method. Isothermal and cyclic oxidation testing in air were used to evaluate the coated substrates at 500–1000 °C. Microhardness profiles were made to test for oxygen contamination of the substrate. These coatings both provided excellent oxidation resistance for CP Ti and the TiAlNb alloys.