热喷涂铁基材料在印刷业耐磨防护上的应用

Thermal Sprayed Fine Fe-based Materials for Wear Protection Applications in the Printing Industry

与典型的耐磨防护材料（如金属陶瓷）相比,铁基材料不仅对人体更健康、更具有环境友好性,而且在材料成本和加工费用方面,其经济效益也更明显。当喷涂粉末的粒度非常细时（小于15um）,所获得的涂层表面更光滑,而且能获得相对较薄的、致密的、接近净成形的涂层。这就会降低涂层材料及加工的费用。本研究采用大气等离子（APS）喷涂粒度为5~15um的铁基细粉制备印刷行业耐磨防护涂层。为了避免细的铁基粉末在喷涂过程中的氧化问题,本研究设计并制备了一个防护罩。在APS设备上安装了这种特殊的防护罩以防止铁基材料的氧化;本文对所制备涂层的显微组织、显微硬度、化学成分、相组成和表面粗糙度进行了分析,同时介绍了这种涂层所产生的经济效益。

Iron based materials are classified as being more health and environmentally friendly as well as cost-effective （material and machining costs） compared to typical materials used for wear protection applications （e.g. ceramets）. The advantage which is seen in using very fine powders （15μm）, is their potential to spray relatively thin, dense near-net-shape coatings with comparable smooth surfaces. This can lead to lower coating as well as machining costs. In this work fine Fe-based powders（-15＋5μm）have been used in order to produce wear resistant coatings for applications in the printing industry by means of air plasma spraying（APS）.With regard to oxidation problems of such fine Fe-based materials a shroud for the air plasma spraying system has been developed and deployed. The resulting coatings have been analysed with respect to the microstructure, micro hardness, chemical and phase composition as well as surface roughness （as-sprayed）.The economical aspects have also been considered.