钼电极表面抗氧化涂层的制备及其性能
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摘要
ZrO_2具有高温稳定性,可使涂层热膨胀系数有效匹配,鲜见其用于钼基体表面涂层的报道。采用料浆法在钼基体上制备出了ZrO_2-玻璃基抗氧化涂层。通过X射线衍射仪(XRD)、扫描电镜(SEM)分析涂层的物相及显微形貌,采用失重法测试了涂层在900℃高温下的抗氧化性能。结果表明:氧化过程中,涂层中生成了具有抗氧化性的BaSi_4O_9玻璃相物质,涂层表面出现相对致密的颗粒和层片状涂层,有利于抗氧化性能提高;氧化初期,ZrO_2-玻璃基涂层的氧化增重量呈增加趋势,且增重量逐渐减小,在1.5h后开始出现增重量下降的趋势,这是由于ZrO_2-玻璃基涂层中BaSi_4O_9膜的完整性被较高的热应力下产生的热裂纹破坏了,为氧的进入提供了通道,使涂层失重所致。
ZrO_2-glass coating was prepared by slurry method to protect molybdenum from oxidation.The microstructure of the coating was characterized by scanning electron microscopy,and the phase composition was characterized by X-ray diffractometers.Moreover,the oxidation resistance in 900 ℃ was also tested through weight loss method.Results showed that during the oxidation process,the oxidation resistant glass-based BaSi_4O_9was formed,and the coating was composed of the relatively dense particles and lamellar structure,which was in favor of the improvement of oxidation resistance.In the early oxidation,the weight gains of ZrO_2-glass coating were increased and then the increment in weight was decreased gradually.After 1.5 h,the weight gains presented the decreasing trend,which was because that BaSi_4O_9 coating was destoried and not complete,providing a pass for oxide.
ZrO_2-glass coating was prepared by slurry method to protect molybdenum from oxidation.The microstructure of the coating was characterized by scanning electron microscopy,and the phase composition was characterized by X-ray diffractometers.Moreover,the oxidation resistance in 900 ℃ was also tested through weight loss method.Results showed that during the oxidation process,the oxidation resistant glass-based BaSi_4O_9was formed,and the coating was composed of the relatively dense particles and lamellar structure,which was in favor of the improvement of oxidation resistance.In the early oxidation,the weight gains of ZrO_2-glass coating were increased and then the increment in weight was decreased gradually.After 1.5 h,the weight gains presented the decreasing trend,which was because that BaSi_4O_9 coating was destoried and not complete,providing a pass for oxide.
引文
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[2]王智勇.钼基体表面氧化锆-玻璃抗氧化涂层的研究[D].上海:东华大学,2010:181~187.
[3]罗振中.钼的应用及其发展[J].中国钼业,2003(2):5~8.
[4]姚维清.用于玻璃电熔窑中钼电极的研究[J].玻璃与搪瓷,2007(3):72~74.
[5]林翠,杜楠,赵晴.高温涂层技术的新进展[J].材料保护,2001,34(6):5~9.
[6]代宝珠,魏世忠,彭光辉,等.钼合金的强韧化机理与研究现状[J].热加工工艺,2009,38(14):51~54.
[7]梁文,张炼,吴金平,等.玻璃基高温防氧化涂料的研究[J].材料保护,2007,40(3):37~39.
[8]古思勇,张厚安,吴艺辉,等.金属钼表面Mo-C-N-Si涂层的制备及其高温氧化特性[J].稀有金属材料与工程,2014,43(5):1 119~1 224.
[9]王林,孙军,孙院军,等.掺杂方式对Mo-La2O3合金组织和力学性能的影响[J].稀有金属材料与工程,2007,36(10):1 827~1 830.
[10]Zhang J,Mei G H,Zhao S M,et al.A fused glass coating for oxidation protection of Mo-W-Zr O2cermet[J].Surf Coat Technol,2015,261:189~193.
[11]马小冲,李继文,魏世忠.玻璃窑炉用钼电极表面抗氧化涂层的研究[J].稀有金属与硬质合金,2014,42(5):51~55.
[12]姚维清.用于玻璃电熔窑炉中钼电极的研究[A].2006国际玻璃电熔技术研讨会论文集[C].上海:中国硅酸盐学会,2006:26~30.
[13]冯培忠,曲选辉,王晓虹,等.二硅化钼材料复合强韧化的研究进展[J].材料导报,2005,19(9):12~15.