Iron Boride Coatings Produced by Cold Spray Processes
Iron Boride Coatings Produced by Cold Spray Processes
复制标题
冷喷涂工艺生产的硼化铁涂层
DOI：
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
D. Seo
中科院分区：
文献类型：
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作者：
I. Ozdemir;K. Ogawa;K. Sato;D. Seo
铁基涂层由于具有良好的机械、摩擦和腐蚀性能而受到广泛关注。具有高含量硼化铁的涂层对于满足工程需要特别有价值。硼和铁形成两个主要的硼化物相，FeB和Fe 2B，具有不同的机械和热性能。正交相硼化物FeB具有较高的硬度，被认为是提高零件表面硬度和耐磨性的可行候选材料。用冷喷涂法制备这种涂层被认为是一种替代传统的热化学表面硬化方法--渗硼法的方法。采用Fe-17.9B-0.4C-1.6Si-0.3Al（wt. %）沉积在低碳钢基体上。然而，由于粉末的固有脆性，低压和高压冷喷涂允许在基底上沉积非常薄的单层。因此，在FeB粉末中加入不同含量的Al、Ni和Fe金属粉末及其组合，通过冷喷涂工艺获得厚涂层。在700 °C的温度下对涂层进行后热处理导致硬度增加，可能是形成了诸如金属间化合物的硬质相。
Iron based coatings have recently gained much attention as they have favorable mechanical, frictional, and corrosion properties. The coatings possessed a high content of iron borides are particularly valuable for satisfying engineering needs. Boron and iron form two major boride phases, FeB and Fe2B, with different mechanical and thermal properties. Orthorhombic boride FeB is considered to be viable candidate to enhance the surface hardness and wear resistance of components, since it has high hardness. Producing of such coating by cold spray method is considered to be an alternative for boronizing method which is a conventional thermochemical surface hardening process. In this work, the crushed ferroboron (FeB) powders of Fe-17.9B-0.4C-1.6Si-0.3Al (wt. %) were deposited onto low carbon steel substrate by cold spraying. However, low and high pressure cold spraying allowed depositing very thin and single layer on the substrate, due to the intrinsic brittleness of the powder. Therefore, several contents of Al, Ni and Fe metallic powder and their combinations were added to FeB powder to obtain thick coating via cold spray processes. Post heat treated coatings at a temperature of 700 °C resulted in increase of the hardness, possibly the formation of hard phases such as intermetallic compound.