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通过微波加热包埋渗法在高铌钛铝合金基体上制备了硅化物涂层,微波加热功率2.6 kW,埋渗时间2 h。利用扫描电镜、能谱分析和X射线衍射等手段研究了氧化前后涂层的表面形貌、截面形貌、涂层中元素分布和物相组成。结果表明:涂层外部主要物相为TiSi2和NbSi2,并有少量的Ti5Si3和Nb5Si3相,厚度约为15μm;内侧涂层有大约15μm的富铝层。1000℃下氧化100 h的氧化动力学测试结果表明:高铌钛铝合金渗硅后的抗高温氧化性能、抗剥落性能有了显著提高,其单位面积增重量和剥落量分别是0.5714 mg/cm2和0.7143 mg/cm2,仅为无涂层试样氧化增重量和剥落量的1/22倍和1/59倍。
The silicide coating was prepared on the high niobium titanium aluminum alloy substrate by microwave heating embedding method. The microwave heating power was 2.6 kW and the burying time was 2 h. The surface morphology, cross-section morphology, elemental distribution and phase composition of the coatings before and after oxidation were studied by scanning electron microscopy, energy dispersive spectroscopy and X-ray diffraction. The results show that the main coating phases are TiSi2 and NbSi2, a small amount of Ti5Si3 and Nb5Si3 phases with a thickness of about 15μm, and the inner coating is about 15μm thick. The results of the oxidation kinetics at 1000 ℃ for 100 h showed that the high temperature oxidation resistance and the anti-spalling property of the high niobium titanium-aluminum alloy after siliconizing were significantly improved. The weight gain per unit area and the peeling amount were 0.5714 mg / cm2 And 0.7143 mg / cm2, only 1/22 times and 1/59 times that of uncoated samples in oxidation weight gain and spalling amount, respectively.