Thermal spraying of cylinder bores with the Plasma Transferred Wire Arc process
Thermal spraying of cylinder bores with the Plasma Transferred Wire Arc process
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DOI：
10.1016/j.surfcoat.2008.04.023
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发表时间：
2008-06-15
影响因子：
5.4
通讯作者：
Flores, G.
中科院分区：
文献类型：
--
作者：
Bobzin, K.;Ernst, F.;Flores, G.
由亚共晶铝硅合金制成的轿车发动机机体通常配备铸铁衬里，以提供符合摩擦学要求的气缸运行表面。热喷涂气缸运行表面是一种很有前途的铸铁衬里的替代方案。由低合金碳钢制成的APS喷涂气缸运行表面已经证明，它们有能力减少发动机内的摩擦损失。新型和高度合金化的铁基表面建筑材料提供了额外的减少摩擦损失的潜力。本工作描述了这种材料的发展和等离子转移丝弧内径涂层工艺的应用。如果采用热喷涂工艺处理，原料会形成部分非晶态涂层，涂层中嵌入了硼化物纳米级沉淀。这些涂层被涂在由EN AW 6060铝制成的试验衬套的内径上，以及一台直列四缸发动机的气缸壁上。在涂层之前，所有要涂层的表面都经过了一种新的精细钻孔工艺的前处理，以创建能够使涂层附着力的表面形貌。用光学显微镜、硬度测量和透射电子显微镜分析了涂层的微观组织结构。此外，还测定了研磨后表面的储油量。(C)2008爱思唯尔B.V.保留所有权利。
Engine blocks of passenger cars made of hypoeutectic AlSi-alloys are generally equipped with cast iron liners in order to provide cylinder running surfaces that meet the tribological requirements. Thermally sprayed cylinder running surfaces are a promising alternative to cast iron liners. APS sprayed cylinder running surfaces made from low alloyed C steel have already proven their ability to reduce friction losses within the engine. Additional potential to reduce friction losses is offered by novel, and highly alloyed iron based surface building materials. This work describes the development of such materials and their application by the Plasma Transferred Wire Arc internal diameter coating process. The feedstocks lead to partially amorphous coatings with embedded boridic nanoscale precipitations if processed by thermal spraying. The coatings were applied onto the inner diameters of test liners made of aluminium EN AW 6060 and onto cylinder bore walls of an in-line 4 cylinder engine. Prior to coating, all surfaces to be coated were pre-treated by a novel fine boring process in order to create a surface topography which enables the adherence of the coatings. The coatings microstructures were analysed by light optical microscopy, hardness measuring and transmission electron microscopy. Furthermore the oil storage capacities of the honed surfaces were determined. (C) 2008 Elsevier B.V. All rights reserved.