等离子喷涂镍基可磨耗封严涂层抗腐蚀及耐磨性能分析

发布时间：2018-02-04 17:00

本文关键词： 可磨耗封严涂层超音速等离子喷涂冲蚀腐蚀摩擦磨损　出处：《无机材料学报》2016年07期 　论文类型：期刊论文

【摘要】：采用高效能超音速等离子喷涂沉积Ni-C及Ni Cr Al-BN可磨耗封严涂层,对比研究两种涂层的抗冲蚀磨损、耐腐蚀及摩擦磨损性能。结果表明:两种涂层中的润滑相均匀分布在金属连续相之中,但与Ni-C涂层相比,Ni Cr Al-BN涂层中的润滑相尺寸较为细小,表面硬度较高。当冲蚀角度由30°增加到90°后,两种涂层冲蚀磨损失重量明显提高。Ni Cr Al-BN涂层的相对冲蚀速率约为Ni-C涂层的50%,表明Ni Cr Al-BN涂层具有较为优良的抗冲蚀性能。Ni-C涂层在稀盐酸中(1vol%)发生了明显的电化学腐蚀,在石墨片周围容易形成腐蚀产物;酸液会沿Ni Cr Al-BN涂层中的孔隙渗入,从而造成金属的局部腐蚀,但腐蚀程度明显较Ni-C轻。随着环境温度的升高,以BN为主的第二相润滑组元的塑性和流动性增强,使摩擦表面原本较小的、不连续的润滑型保护膜逐渐铺展开来,形成面积较大且呈连续分布的鳞片状自润滑保护膜。原来在较低温度下润滑膜中存在的裂纹、疏松或剥离等缺陷明显减少,导致Ni Cr Al-BN涂层摩擦系数大幅度降低,从而显示出优异的高温自润滑性能。
[Abstract]:Ni-C and Ni Cr Al-BN wearable sealing coatings were deposited by hypersonic plasma spraying with high performance. The erosion resistance of the two coatings was studied. The results show that the lubricating phase of the two coatings is uniformly distributed in the metal continuous phase, but compared with the Ni-C coating. The size of lubricating phase in Ni Cr Al-BN coating is smaller and the surface hardness is higher, when the erosion angle is increased from 30 掳to 90 掳. The relative erosion rate of the two coatings is about 50% of that of the Ni-C coating, and the relative erosion rate of the two coatings is about 50% of that of the Ni-C coating. The results show that Ni-Cr Al-BN coating has better erosion resistance. Ni-C coating has obvious electrochemical corrosion in dilute hydrochloric acid. Corrosion products are easily formed around the graphite sheet. The acid will infiltrate through the pores of Ni Cr Al-BN coating, resulting in local corrosion of metal, but the corrosion degree is obviously lighter than that of Ni-C, and with the increase of ambient temperature. The plasticity and fluidity of the second phase lubricating component based on BN are enhanced, which makes the discontinuous lubricating protective film spread out gradually. A large scale self-lubricating protective film was formed with a large area and continuous distribution. The cracks, loose or peeling defects in the lubricating film were obviously reduced at lower temperature. The friction coefficient of Ni Cr Al-BN coating is greatly reduced, which shows excellent high temperature self lubricating property.
【作者单位】：西安交通大学机械工程学院;西安交通大学金属材料强度国家重点实验室;陕西工业技术研究院;装甲兵工程学院;
【基金】：国家自然科学基金(51202211,51202187) 中国博士后科学基金(2014M562404)~~
【分类号】：V263
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