高效能超音速等离子喷涂NiCr-Cr3C2涂层性能研究
Properties of NiCr-Cr3C2 Coating Prepraed by High Efficiency Supersonic Plasma Spraying
谢兆钱, 王海军, 郭永明, 李绪强
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作者单位：(装甲兵工程学院 装备再制造技术国防科技重点实验室, 北京 100072)
中文关键字：超音速等离子喷涂； NiCr-Cr3C2； 涂层性能
英文关键字：supersonic plasma spraying; NiCr-Cr3C2; properties of coating
中文摘要：采用自行研制的高效能超音速等离子喷涂系统(HEPJet)制备了NiCr-Cr3C2涂层,并对涂层性能进行测试。结果表明，喷涂粒子速度高达460 m/s，实现了低功率、小气体流量获得超音速涂层的目的；HEPJet制备的NiCr-Cr3C2涂层其结合强度为60 MPa，显微硬度为926 HV0.3，沉积效率为54 %,其抗高温氧化性能是12CrMoV钢的17倍，其常规性能赶超JP5000制备的NiCr-Cr3C2涂层。涂层表面的Cr2O3氧化膜与碳化物硬质相组成连续、致密而均匀的保护层是NiCr-Cr3C2涂层抗高温氧化性好的主要原因。
英文摘要：NiCr-Cr3C2 coating was fabricated by self-developed supersonic plasma spraying equipment (HEPJet). The properties of the NiCr-Cr3C2 coating were measured. The results show that the particle velocity can reaches 460 m/s, the supersonic spraying can be realized by low power and little gas flux. Bonding strength of the coating is 60 MPa, micro-hardness is 926 HV0.3, deposition efficiency is 54%, and the thermal oxidation behavior of the NiCr-Cr3C2 coating is 17 times of 12CrMoV. These properties overtake JP5000's. Cr2O3 and carbide form a protective film, which is the main reason of the coating from thermal oxidation.