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Cracking Resistance and Impact Wear of Thin and Thick Hard Coatings Under Cyclic Loading

机译:循环载荷下薄而厚硬质涂层的抗裂性和冲击磨损

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Among wear resistant coatings and deposition techniques physical vapour deposition of hard thin coatings and high-velocity oxy-fuel spraying of thick WC-Co-based powder coating have provided good wear protection against various types of wear including impact wear. Three different substrate and coating systems-hard metal-coating, cold work tool steel-coating and nitrided steel-coating-were studied. Mono- and multilayer coatings as well as duplex coatings were selected for testing. For characterization of coating systems nanohardness and microhardness as well as Rockwell adhesion test and single point indentation methods were used. Wear resistance of coatings was determined considering impact wear. The best adhesion determined by indentation was demonstrated by monolayer coating (TiN) on a hard metal substrate; the same coating system has a higher impact wear resistance. The coatings with multilayer structure (TiAIN) demonstrate better cracking resistance. Resistance to cracking as well as to impact wear depends on coating E/H ratio (at lower loads) as well as on substrate material E/H ratio (at higher loads). For characterization of resistance to plastic deformation for substrate H_s~3/E_S~2| ratio was used. The obtained data enable a comparison of cracking and impact wear resistance of a coated system and selection of an optimal coating for metal forming tools applications.
机译:在耐磨涂层和沉积技术中,硬质薄涂层的物理气相沉积和厚WC-Co基粉末涂料的高速氧-燃料喷涂为各种类型的磨损(包括冲击磨损)提供了良好的磨损保护。研究了三种不同的基材和涂层系统-硬质金属涂层,冷作工具钢涂层和渗氮钢涂层。选择单层和多层涂层以及双面涂层进行测试。为了表征涂层系统,使用了纳米硬度和显微硬度以及洛氏附着力测试和单点压痕方法。确定涂层的耐磨性时要考虑冲击磨损。通过压痕确定的最佳附着力通过在硬质金属基材上进行单层涂层(TiN)来证明;同一涂层系统具有更高的耐冲击磨损性。具有多层结构(TiAIN)的涂层表现出更好的抗裂性。耐开裂性和抗冲击磨损性取决于涂层的E / H比(在较低的载荷下)以及基材的E / H比(在较高的载荷下)。为了表征基材的抗塑性变形性能H_s〜3 / E_S〜2 |使用比率。获得的数据可以比较涂层系统的抗龟裂性和抗冲击磨损性,以及选择用于金属成型工具应用的最佳涂层。

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