| 摘要: |
| 针对传统高温防护涂层在长期服役环境中可靠性不足等问题，设计了新型Cr23C6–NiCr金属陶瓷体系，并采用超音速火焰喷涂（High Velocity Oxyfuel Spraying，HVOF）技术制备了相应复合结构涂层。利用XRD、SEM和高温电阻炉等设备，对比研究了其与传统Cr23C6–NiCr金属陶瓷涂层的微观组织结构特征及高温氧化行为。结果表明，复合涂层具有HVOF喷涂涂层典型的致密层状结构，喷涂过程中无明显相分解或氧化物生成。两种涂层在经过800 ℃循环氧化后具有相似的氧化动力学曲线，表面生成均匀致密的Cr2O3钝化膜阻止了氧原子向涂层内部的扩散，起到了较好的隔离防护作用，呈现出较为优异的抗高温氧化性能。 |
| 关键词: Cr23C6–NiCr涂层 HVOF 微结构 高温氧化 |
| DOI： |
| 分类号: |
| 基金项目: |
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| Preparation and HighTemperature Oxidation Behavior of Cr23C6–NiCr Thermal Sprayed Coatings |
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ZHOU Zheng, YAO Hai–hua, GAO Feng, HE Ding–yong, REN Xian–jing, JIANG Jian–min1,2
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1. College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124;2. Beijing General Institute of Mining Metallurgy, Beijing 100044
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| Abstract: |
| A new type of ceramicmetallic (cermet) with nominal composition of Cr23C6–NiCr was designed to improve the reliability of the hightemperature resistance, and the relative composite coatings were prepared by means of high velocity oxygen fuel (HVOF) thermal spraying. The microstructure and hightemperature oxidation behavior of the asdeposited coatings, as well as that of the traditional Cr23C6–NiCr coatings, were detected by XRD, SEM and hightemperature furnace. It is found that the composite coatings present dense layered structure typical of HVOF thermal sprayed deposits without visible phase decomposition or oxidation during spraying process. In addition, both of the coatings with similar oxidizing dynamics curves exhibit excellent hightemperature oxidation resistance, which are attributed to the formation of uniform and dense Cr2O3 passive film on the surfaces inhibiting the penetration of oxygen. |
| Key words: Cr23C6–NiCr coating HVOF microstructure hightemperature oxidation |
