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采用曲率半径2μm的金刚石针尖,分别在原子力显微镜和纳米划痕仪上研究了GCr15、304不锈钢、超弹和形状记忆NiTi合金等材料在5μN~80 mN载荷的摩擦学性能.结果表明,载荷对材料的摩擦机制有很大影响.当载荷低于80μN时,4种样品表面均无明显的划痕损伤,摩擦机制以界面摩擦为主;100~150μN时,摩擦机制逐渐转变到以犁沟摩擦为主;80 mN时,4种材料犁沟摩擦力占总摩擦力的比例甚至超过90%.另外,材料的硬度和弹性模量对其摩擦性能也有显著影响.硬度越高,材料越难发生犁沟损伤,摩擦机制从界面摩擦转变到犁沟摩擦对应的载荷越高;弹性模量与硬度的比值越大,摩擦过程中的犁沟效应越显著,犁沟摩擦力占总摩擦力的比重越大.
The tribological properties of GCr15, 304 stainless steel, superelastic and shape memory NiTi alloys at 5μN ~ 80 mN were investigated by AFM and nano-scratch tester using diamond tips with a radius of curvature of 2μm. The results show that the loading When the load is less than 80μN, there is no obvious scratch damage on the surface of the four samples, and the friction mechanism is dominated by interfacial friction. When the friction is 100 ~ 150μN, the friction mechanism gradually changes to the friction And the frictional force of the furrows of the four kinds of materials accounts for more than 90% of the total friction force at 80 mN. In addition, the hardness and elastic modulus of the material also have a significant impact on the frictional properties of the material. The harder the material, the harder the material occurs Furrow damage and friction mechanism from the interface friction to furrow friction corresponding higher load; the greater the ratio of elastic modulus and hardness, furrow effect in the friction process is more significant, furrow friction the proportion of the total friction The bigger