| 摘要: |
| 采用多弧离子镀在65Mn钢基体上制备了不同Al含量的CrAlN复合涂层，采用X射线衍射（XRD）、扫描电子显微镜（SEM）、能谱仪（EDS）、纳米硬度仪和高温氧化炉，系统分析了CrAlN复合涂层的成分、相结构、表面形貌、纳米硬度和抗高温氧化性能。研究结果表明：添加Al后，CrN涂层的择优取向由(111)转变为(200)，随着Al含量的增大，衍射峰向右偏移，晶格常数逐渐减小，涂层的表面粗糙度增大，纳米硬度值增加。与CrN涂层相比，CrAlN复合涂层具有较好的抗高温氧化性能，且随Al含量的增加，抗高温氧化性能增强，其原因是涂层表面形成了铬铝氧化物，减小了高温条件下氧向涂层内部的扩散能力。 |
| 关键词: CrAlN复合涂层 微观组织 高温氧化 |
| DOI： |
| 分类号: |
| 基金项目:重点实验室基金项目(9140C8502071006) |
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| Microstructure and Oxidation Resistance of CrAlN Composite Coatings on Piston Rings |
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CAI Zhi–hai, DI Yue–lan, ZHANG Ping
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Science and Technology on Remanufacturing Laboratory, Academy of Armored Force Engineering
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| Abstract: |
| In this paper, CrAlN composite coatings with different Al content were deposited on 65Mn steel substrates by multi–ion plating technology. The structure, surface morphology, composition, nano hardness and oxidation resistance of CrAlN composite coatings were tested by XRD, EDS, SEM, Nano hardness tester and oxidation furnace, respectively. The experimental results indicated that the preferential growth orientation of the coatings was changed from CrN (111) to CrN (200) after the addition of Al element. With the increasing Al content, the diffraction peak shifted rightwards, which means the crystal lattice constant reduced gradually. Roughness and nano–hardness of CrAlN coatings increase gradually with the increasing Al content. Compared with CrN coatings, the CrAlN composite coatings appeared much better oxidation resistance. And the oxidation resistance ability will enhanced with increasing Al content because Al and Cr oxide formed after oxidation in high temperature condition which reducing the diffusivity ability of oxygen. |
| Key words: CrAlN composite coatings microstructure oxidation resistance |
