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采用液相烧结技术制备的三元硼化物硬质合金覆层材料具有成本低廉、耐磨抗蚀的优异性能。利用覆层连结试样和抗弯强度法测定的覆层材料的覆层-钢基体界面结合强度为740MPa。覆层与钢基体之间的断裂破坏不是由于覆层与钢基体之间结合界面的剥离,而是发生于界面附近的钢基体和覆层内。利用显微硬度计测定了覆层-钢基体界面结合区的显微硬度变化,并利用SEM-EDS研究了覆层-钢基体界面微观结构和界面区元素分布。在覆层-钢基体结合界面处,存在由高硬度(覆层)到低硬度(钢基体)的狭窄过渡区,合金元素浓度分布没有突变,形成一个具有一定厚度的过渡层。分析了覆层-钢基体界面层形成的机理,并以扩散理论为基础,建立了覆层材料覆层-钢基体界面层生长的数学模型。
The ternary boride carbide coating prepared by the liquid phase sintering technology has the advantages of low cost, excellent abrasion resistance and corrosion resistance. The coating-steel substrate interface bond strength of the coating material measured by the coating-bonded specimen and the flexural strength method was 740 MPa. The fracture failure between the coating and the steel substrate is not due to the peeling of the bonding interface between the coating and the steel substrate, but rather occurs within the steel substrate and coating near the interface. The microhardness of the interface between the coating and the steel substrate was measured by microhardness tester. The microstructure and interface element distribution of the interface between the coating and the steel substrate were studied by SEM-EDS. There is a narrow transition zone from high hardness (cladding) to low hardness (steel matrix) at the cladding-steel matrix bonding interface, with no abrupt change in the alloy element concentration distribution to form a transition layer with a certain thickness. Based on the theory of diffusion, the mathematical model of the interface between cladding and steel substrate was established.