Preparation and wear performance of NiCr/Cr3C2-NiCr/hBN plasma sprayed composite coating
Preparation and wear performance of NiCr/Cr3C2-NiCr/hBN plasma sprayed composite coating
复制标题
NiCr/Cr3C2-NiCr/hBN等离子喷涂复合涂层的制备及耐磨性能
DOI：
10.1016/j.surfcoat.2011.01.031
复制
发表时间：
2011-03-15
影响因子：
5.4
通讯作者：
Liu, Wei
中科院分区：
文献类型：
--
作者：
Du, Lingzhong;Huang, Chuanbing;Liu, Wei
在NiCr/Cr 3C 2基体中添加NiCr包覆六方氮化硼粉末（NiCr/hBN），以改善碳化铬镍铬合金涂层的摩擦学性能。对复合粉末的显微结构、流动性、松装密度以及等离子喷涂层的组织和力学性能进行了表征。在球盘磨损试验机上评价了NiCr/Cr 3C 2-NiCr/hBN涂层从室温到800 ℃的摩擦磨损行为，并与NiCr/Cr 3C 2涂层和NiCr/Cr 3C 2-NiCr/BaF 2-CaF 2涂层进行了比较。结果表明，NiCr涂层能有效地抑制热喷涂过程中Cr 3C 2的脱碳和hBN的氧化。NiCr/Cr 3C 2-NiCr/hBN复合涂层的主要磨损机制为犁削和粘着磨损。层状六方氮化硼颗粒减少了摩擦副之间的直接接触和严重的粘着，从而降低了摩擦系数。NiCr/Cr 3C 2-NiCr/hBN复合涂层在高温环境下具有良好的应用前景，可满足耐磨和减摩的双重要求。(C)2011 Elsevier B. V.保留所有权利。
NiCr clad hexagonal BN powder (NiCr/hBN) was added to NiCr/Cr3C2 feedstock to improve the tribological properties of chromium carbide nichrome coating. The microstructure, flowability and apparent density of the composite powder, as well as the structure and mechanical properties of the plasma sprayed coating were characterized. The friction and wear behavior of the NiCr/Cr3C2-NiCr/hBN coating from ambient temperature up to 800 degrees C was evaluated on a ball-on-disk wear tester and compared with that of NiCr/Cr3C2 coating and NiCr/Cr3C2-NiCr/BaF2-CaF2 coating. The results show that NiCr cladding can reduce the decarburization of Cr3C2 and oxidation of hBN during the thermal spray. The main wear mechanisms of the NiCr/Cr3C2-NiCr/hBN composite coating are ploughing and adhesive wear. Layered hexagonal BN particle reduce the direct contact and severe adhesion between friction pairs, thus decreasing the friction coefficient. The NiCr/Cr3C2-NiCr/hBN composite coating shows a promising application in the high temperature environment with the request of both wear resistance and friction reduction. (C) 2011 Elsevier B.V. All rights reserved.