Experimental Study on the Effect of Water-based Magnetic Fluid on the Tribological Properties of TC4 and Si3N4 under the Action of a Magnetic Field
Abstrct:Titanium alloy(TC4)is widely used in corrosion-and heat-resistant applications such as aerospace,due to its high strength and other excellent mechanical performance.The deep research on tribological properties of TC4 will broaden its further applications.In recent years,water-based magnetic fluid,as an intelligent and environmentally-friendly lubricant,has played an important role in solving the lubrication problem under extreme operating conditions.The effect of water-based magnetic fluid on the tribological properties of titanium alloy in magnetic field is studied by using a friction and wear tester.Firstly,the magnetic properties of water-based magnetic fluid are studied experimentally.The original magnetic fluid is diluted with an ultrasonic cleaner to obtain stable water-based magnetic fluid with concentrations of 0.3％,0.6％,0.9％,1.2％,10％and 20％respectively.The size and morphology of magnetic particles are measured by vibrating sample magnetometer(VSM),field emission transmission electron microscope(TEM)and static contact angle meter,respectively.The wettability of water-based magnetic fluid with different concentrations is studied,and the magnetic properties of water-based magnetic fluid are discussed.The experimental results show that Fe3O4 particles are spherical,with an average particle size of 14 nm,and have good paramagnetism.The wettability of water-based magnetic fluid increases with the increase of concentration.Secondly,the tribological properties of water-based magnetic fluid are studied.Taking TC4 titanium alloy and Si3N4 ceramic ball as test pieces,the friction coefficient of titanium alloy surface lubricated by water-based magnetic fluid with different concentrations under different magnetic field intensities is measured by UMT-3 reciprocating friction and wear tester,and the wear amount was measured by high-precision roughness meter.The results show that,by comparing with the experimental results of the base fluid,it is found that the water-based magnetic fluid with different concentrations has a certain antifriction effect,among which the magnetic fluid with a concentration of 1.2％has the best antifriction effect,and the friction coefficient is reduced by 16.99％.However,when the external magnetic field is applied,the wear loss of water-based magnetic fluid with different concentrations will increase compared with water-based magnetic fluid lubricated with water.However,with the increase of particle concentration and magnetic field strength,the wear loss decreases gradually.Finally,the mechanism of the tribological properties of water-based magnetic fluid with different concentrations under different magnetic fields is analyzed through the experimental data,which provides an experimental basis for the future application of water-based magnetic fluid in the lubrication field.
nano-additivewater-based magnetic fluidmagnetic field intensityfrictionantifriction lubrication performance
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