为了防止Mo合金的高温氧化,本研究采用低压化学气相沉积技术在Mo合金表面制备MoSi2抗氧化涂层,借助X射线衍射仪、扫描电镜及能谱仪等分析手段,对涂层的微观结构进行了研究,测试了涂层的抗氧化和抗热震性.结果表明：MoSi2涂层结构致密,仅有少量微裂纹存在,表现出良好的抗热震和抗氧化性能;经20次1300℃-室温循环热震实验后,涂层未出现开裂与脱落现象;涂层试样在1300℃氧化气氛下氧化180 h,失重率小于0.83%,分析揭示了涂层试样氧化失重的主要原因为氧扩散通过涂层与Mo基体发生反应,生成极易挥发的MoO、MoO2、MoO3,氧在涂层中的扩散速率决定了涂层的失重速率.
To prevent Mo alloy from oxidation,a MoSi2 coating has been prepared by low pressure chemical vapor deposition（LPCVD）.Microstructures of the coating were studied through XRD,SEM,EDS.The isothermal oxidation and thermal shock of the coating was also tested.Results show that the MoSi2 coating has compact structure with only a few microcracks and exhibites a nice thermal shock resistance and anti-oxidation ability.The coated samples have just a 0.3% weight loss after 20 times thermal shocks.No spalling and splitting appear in the coating.For 180 h isothermal oxidation at 1300 ℃,the weight loss of sample is less than 0.83%.The weight loss is mainly owing to the generation of volatile MO,MoO2 and MoO3 by the reaction between the oxygen diffused in and Mo at the interface between the coating and matrix.
参考文献
| [1] | 陈程,尹海清,曲选辉,朱琳.钼变形抗力的研究[J].稀有金属材料与工程,2007(07):1237-1240. |
| [2] | 韩强.钼及其合金的氧化、防护与高温应用[J].中国钼业,2002(04):32-34. |
| [3] | Zhang Yu-Lei;Li He-Jun;Fu Qian-Gang .A Si-Mo oxidation protective coating for C/SiC coated carbon/carbon composites[J].Carbon: An International Journal Sponsored by the American Carbon Society,2007(5):1130-1133. |
| [4] | Fu Qian-Gang;Li He-Jun;Li Ke-Zhi .A MoSi_2-SIC-SI/glass oxidation protective coating for carbon/carbon composites[J].Carbon: An International Journal Sponsored by the American Carbon Society,2006(15):3361-3364. |
| [5] | 曾燮榕,李贺军,李龙,李爱兰.碳/碳复合材料MOSi2/SiC涂层在动态氧化环境下的性能研究[J].复合材料学报,2002(06):43-46. |
| [6] | S. P. Chakraborty;S. Banerjee;Kulwant Singh;I. G. Sharma;A. K. Grover;A. K. Suri .Studies on the development of protective coating on TZM alloy and its subsequent characterization[J].Journal of Materials Processing Technology,2008(1/3):240-247. |
| [7] | 张中伟,王俊山,许正辉,李承新.不同制备工艺对MoSi2涂层抗氧化性能的影响[J].宇航材料工艺,2007(01):58-60. |
| [8] | Yoon JK.;Byun JY.;Kim GH.;Kim JS.;Choi CS. .Growth kinetics of three Mo-silicide layers formed by chemical vapor deposition of Si on Mo substrate[J].Surface & Coatings Technology,2002(1):85-95. |
| [9] | Yoon JK.;Kim GH.;Byun JY.;Lee JK.;Yoon HS.;Hong KT. .Effect of Cl/H input ratio on the growth rate of MOSi2 coatings formed by chemical vapor deposition of Si on Mo substrates from SiCl4-H-2 precursor gases[J].Surface & Coatings Technology,2003(2/3):176-183. |
| [10] | 吴恒,李贺军,王永杰,付前刚,何子博,魏建锋.低压沉积温度对MoSi2涂层微观结构与性能影响[J].无机材料学报,2009(02):392-396. |
| [11] | Majumdar S;Sharma IG;Raveendra S;Samajdar I;Bhargava P .In situ chemical vapour co-deposition of Al and Si to form diffusion coatings on TZM[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2008(1/2):211-217. |
| [12] | 王德志,刘心宇,左铁镛.MoSi2-Mo5Si3复合材料的低温氧化行为[J].稀有金属材料与工程,2002(01):48-51. |
| [13] | 李龙,曾燮榕,李贺军,谢盛辉,熊信柏,邹继兆,唐汉玲.炭/炭复合材料用SiC-Glass涂层的高温氧化机理[J].复合材料学报,2007(05):113-118. |
| [14] | Huang Jian-Feng;Zeng Xie-Rong;Li He-Jun .Oxidation behavior of SiC-Al_2O_3-mullite multi-coating coated carbon/ carbon composites at high temperature[J].Carbon: An International Journal Sponsored by the American Carbon Society,2005(7):1580-1583. |
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