Abrasive wear mechanisms of VPS‐ and HVOF‐sprayed TiC‐Ni based nanocrystalline coatings
Abrasive wear mechanisms of VPS‐ and HVOF‐sprayed TiC‐Ni based nanocrystalline coatings
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DOI：
10.1002/mawe.200400820
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发表时间：
2004-10
影响因子：
1.1
通讯作者：
X. Qi;E. Aust;N. Eigen;F. Gärtner;R. Bormann
中科院分区：
文献类型：
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作者：
X. Qi;E. Aust;N. Eigen;F. Gärtner;R. Bormann
纳米晶涂层在各种工程应用中具有很高的潜力，例如在造纸过程中防止轧辊磨损和作为腐蚀防护。使用真空等离子喷涂(VPS)和高速氧燃料喷涂(HVOF)技术，涂层材料只需在高温下暴露不到一毫秒。因此，高能球磨粉末可以作为原料，在热喷涂过程中不会丢失其纳米晶组织。通过这种方法，可以获得均匀致密的纳米晶涂层，其硬度得到了提高，从而获得了良好的耐磨性。采用真空等离子喷涂和超音速火焰喷涂高能球磨粉末制备了(Ti，Mo)(C，N)-45vol.%NiCo纳米晶涂层。采用JIS H 8615不同冲程磨粒磨损试验和维氏压头划痕试验研究了纳米晶涂层抛光表面的磨损痕迹。用光学显微镜(OM)、扫描电子显微镜(SEM)和原子力显微镜(AFM)对磨料磨损行为进行了分析。试验结果表明，VPS涂层的耐磨粒磨损性能优于JIS H8615标准的HVOF涂层。VPS喷涂纳米晶涂层的磨粒磨损机理可描述为切割+犁削磨损。超音速火焰喷涂纳米晶涂层的磨粒磨损机制可描述为切割+材料剥落。
Nanocrystalline coatings have a high potential for various engineering applications, e.g. against wear of rolls in the paper fabrication and as corrosion protection. Using vacuum plasma spray (VPS) and high velocity oxy‐fuel (HVOF) spray techniques, coating materials are exposed to high flame temperatures only for less than a millisecond. Therefore, high‐energy milled powders can be used as feedstock material without losing its nanocrystalline microstructure during the thermal spray process. In this way, homogeneous, dense nanocrystalline coatings can be produced, which show enhanced hardness, thus obtaining promising superior wear resistance. In the present study, (Ti,Mo)(C,N)‐45vol.%NiCo nanocrystalline coatings were prepared by VPS‐ and HVOF‐spraying of high‐energy milled powders. Abrasive wear tests JIS H 8615 with varying number of strokes and scratch tests with a Vickers indenter were applied to produce wear traces on the polished surfaces of the nanocrystalline coatings. Abrasive wear behaviour was analyzed by investigating the surface morphologies with optical microscopy (OM), scanning electron microscopy (SEM) and atomic force microscopy (AFM). Experimental results indicate that the VPS‐coating has higher abrasive wear resistance than the HVOF‐coating according to the JIS H8615 test. The abrasive wear mechanism of VPS‐sprayed nanocrystalline coatings can be delineated as cutting plus ploughing. For HVOF‐sprayed nanocrystalline coatings the abrasive wear mechanism can be described as cutting plus material delamination.