冷喷涂制备TiAl_3-Al复合层及其抗高温氧化性能
Preparation of TiAl_3-Al Composite Coating by Cold Spraying and Evaluation of Its High Temperature Oxidation Behavior
查看参考文献12篇
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文摘
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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TiAl_3-Al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;TiAl_3-Al复合涂层和基体之间生成了TiAl_3相,TiAl_3与Al的界面有空洞;γ-TiAl合金高温氧化70 h即失重,氧化产物为TiO_2和Al_2O_3的混合物;TiAl_3-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1 000 h后涂层仍完好,氧化产物主要为Al_2O_3相,还有微量的TiO_2及钛氮化合物;TiAl_3-Al复合涂层提高了γ-TiAl合金的抗高温氧化性能。 |
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其他语种文摘
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TiAl_3-Al composite coating with an average thickness of 250 μm was prepared on γ-TiAl alloy by cold spraying and subsequent heat-treatment.The phase structure,morphology and composition of as-sprayed composite coating were analyzed using an X-ray diffractometer,a field emission electron microscope and an electron probe.The long time high-temperature oxidation behavior of the coating at 950 ℃ was investigated.It was found that cold-sprayed Al coating was compact and contained a small amount of micro-cracks and gas holes.TiAl_3 phase was formed between TiAl_3-Al compo site coating and substrate,and pores existed at the interface of TiAl _3 and Al.The alloy substrate(γ-TiAl) lost weight after 70 h of oxidation at 950 ℃,generating TiO_2 and Al_2O_3 as the mixed oxidized products.The composite coating gained weight slowly in the steady oxidation period where the oxidation kinetics curve approximately followed a parabolic rate law.Even after 1000 h of oxidation at 950℃,the composite coating kept almost intact,and its oxidized product consisted of alumina and trace of titanium dioxide and titanium nitrides.In general,the composite coating could significantly improve the oxidation resistance of γ-TiAl alloy at elevated temperature. |
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来源
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材料保护
,2012,45(4):9-11,72 【核心库】
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关键词
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冷喷涂
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TiAl_3-Al复合涂层
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γ-TiAl
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抗高温氧化性能
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地址
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中国科学院金属研究所表面工程部, 金属腐蚀与防护国家重点实验室, 辽宁, 沈阳, 110016
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1001-1560 |
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学科
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金属学与金属工艺 |
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基金
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国家自然科学基金资助项目
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文献收藏号
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CSCD:4574905
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参考文献 共
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