涂层硬度不仅取决于涂层材料本身,同时还与试验负荷和膜层的厚度密切相关。为了获得与基底材料无关的膜层的真实硬度,选择测试负荷时务必使压头下的塑变区局限在膜层内。因此,其测试时存在一临界测试负荷,也就是说,压痕深度t和膜层厚度D的比值(t/D)一般应小于0.1～0.2,而且此值随涂层—基体系统不同而异。 The coating hardness depends not only on the coating material itself but also on the test load and film thickness. In order to obtain the actual hardness of the film unrelated to the substrate material, the plastic deformation zone under the indenter must be limited to the film layer when selecting the test load. Therefore, there is a critical test load for testing, that is, the ratio of the indentation depth t to the film thickness D (t / D) should generally be less than 0.1 to 0.2, and this value varies with the coating-substrate system .