纳米流体与微织构耦合作用对刀具材料摩擦磨损性能的影响研究

合理的表面织构可有效改善摩擦副界面间的摩擦状态。为研究纳米流体与表面微织构耦合作用对硬质合金刀具材料摩擦性能的影响,采用“两步法”将纳米Fe3O4颗粒添加到水基切削液基础液,制备出质量分数为0.5%的Fe3O4纳米流体,并利用激光微加工技术在光滑的YG6X硬质合金样件表面制备出不同尺寸参数的沟槽型与凹坑型表面微织构。分析纳米流体与表面微织构耦合作用下硬质合金样件的摩擦磨损性能,整理摩擦系数、样件表面磨损形貌、磨球磨损率等数据发现,纳米流体能够有效改善基础液的润滑性能,在一定尺寸形状的织构样件相互作用下表现出优异的抗磨减摩性能,并且揭示了相应的减摩抗磨机理。

Coupling Effect of Micro-textures and Nanofluids on Tribological Properties of Cemented Carbide Tools Materials

Two-step method is used to prepare the Fe3O4 nanofluids(NC)with a mass fraction of 0.5%.The Fe3O4 nanoparticles are added to the water-based cutting fluids(CC).After that,the oil acid is added under ultrasonic vibration and magnetic stirring so as to get a stable suspension fluid.The dispersing effect of Fe3O4 nanofluids is evaluated by sedimentation method.Results obtained that the prepared Fe3O4 nanofluids had better stability.And the Nd:YAG laser is employed to fabricate various parameters and morphologies of surface textures on YG6X cemented carbide sample.The friction and wear test is carried out,that the lubrication performance of nanofluids is investigated by measuring the friction coefficient,the wear behaviors of the sample and the wear rate of the ball.It is found that the nanofluids could improve the lubrication performance of the water-based fluids.Excellent properties of anti-friction and anti-wear can be achieved by combining with nanofluids and surface textures.And the corresponding anti-friction mechanism is also revealed.