为了提高γ-TiAl合金的抗高温氧化性能,采用冷喷涂技术在γ-TiAl合金基体上喷涂纯Al层后进行热扩散处理,制备了厚约250μm的TiAl3-A1复合涂层,研究了该涂层在950℃下的长时间高温氧化行为,用X射线衍射仪(XRD)分析了复合涂层的相组成,用场发射电子显微镜研究了其形貌,用电子探针分析了其成分。结果表明:冷喷涂纯Al层致密,存在少量微裂纹和微气孔;TiAl3-Al复合涂层和基体之间生成了TiAl,相,TiAl3与Al的界面有空洞;γ-TiAl合金高温氧化70h即失重,氧化产物为TiO2和Al2O3的混合物;TiAl3-Al复合涂层进入稳态氧化阶段后,增重缓慢,遵循近抛物线规律,高温氧化1000h后涂层仍完好,氧化产物主要为Al2O3相,还有微量的TiO2及钛氮化合物;TiAl3-Al复合涂层提高了γ-TiAl合金的抗高温氧化性能。
参考文献
[1] | 林均品,陈国良.TiAl基金属间化合物的发展[J].中国材料进展,2009(01):31-37. |
[2] | C. Leyens;R. Braun;M. Frohlich .Recent Progress in the Coating Protection of Gamma Titanium-Aluminides[J].JOM,2006(1):17-21. |
[3] | Rakowski J M;Pettit F S;Meier G H et al.The effect of nitrogen on the oxidation of gamma-TiA1[J].Scripta Metallurgica et Materialia,1995,33(06):997-1003. |
[4] | Chu M S;Wu S K .Oxidation behavior of Ti-50A1 inter-metallics with thin TiA13 film at 1 000 degrees C[J].Oxidation of Metals,2005,63(1/2):1-13. |
[5] | Mabuchi H;Asai T;Nakayama Y .Aluminide coatings on TiA1 compound[J].Scripta Metallurgica,1989,23(05):685-689. |
[6] | 吴向清,谢发勤,胡宗纯,王立.扩散铝涂层对TiAl合金高温摩擦磨损性能的影响[J].材料热处理学报,2010(05):113-117. |
[7] | 熊天英,吴杰,金花子,李鸣,吴敏杰,刘星,李铁藩.一种新喷涂技术-冷气动力喷涂[J].腐蚀科学与防护技术,2001(05):267-269. |
[8] | Kong, LY;Qi, JZ;Lu, B;Yang, R;Cui, XY;Li, TF;Xiong, TY .Oxidation resistance of TiAl3-Al composite coating on orthorhombic Ti2AlNb based alloy[J].Surface & Coatings Technology,2010(14):2262-2267. |
[9] | Van Steenkiste TH.;Smith JR.;Teets RE. .Aluminum coatings via kinetic spray with relatively large powder particles[J].Surface & Coatings Technology,2002(2/3):237-252. |
[10] | Van Loo F J J;Rieck G D .Diffusion in the titanium-alu-minium system -Ⅱ.Interdiffusion in the composition range between 25 and 100 at.% Ti[J].Acta Metallurgica,1973,21(01):73-84. |
[11] | Fu EKY.;McShane HB.;Rawlings RD. .Reaction synthesis of titanium aluminides[J].Journal of Materials Science,2001(23):5537-5542. |
[12] | 彭超群,黄伯云,贺跃辉.TiAl基合金的抗氧化性及其改善[J].稀有金属材料与工程,1999(02):93-96. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分:
-
10%
-
20%
-
30%
-
40%
-
50%