Study On Wear Resistance Of 65Mn Steel Based On Coating Reinforcement And Surface Texture

Earth parts as an important part of agricultural machinery,65 Mn steel as a commonly used material of earth parts,its wear resistance and energy consumption are the key to the current agricultural mechanization.In this study,a method based on coating reinforcement and surface biomimetic texture,and the wear and adhesion mechanism is proposed to provide a feasible optimization scheme for wear and viscosity reduction of agricultural machinery and soil parts.The Ni base coating with different WC ratio is prepared by plasma stacking technology on 65 Mn steel substrate surface with wear resistant coating preferred;use laser technology to study friction adhesion properties,deposited different process Ti₆₇Al₃₃coating,preferred hydrophobic process and deposited on the texture resistant coating surface with the best wear resistance and viscosity resistance by test.The main research contents and conclusions are as follows:（1）Based on the principle of tribology,Ni base alloy coatings with different proportions of WC were surfacing on the surface of soil-touching parts to explore the protective mechanism of wear-resistant coating.Experimental results show that the hardness of Ni60A+35%WC coating is up to 1219.8 HV,which is significantly higher than the surface microhardness of 65 Mn steel.With the increase of WC ratio,the quality loss caused by abrasive wear and friction wear decreases.Therefore,WC has a strengthening effect on The Ni-base alloy coating,which can not only improve the surface hardness,but also show good wear resistance in abrasive wear and friction wear.The hardness and wear resistance of WC reach the best at 35%ratio.（2）Using the tribological effect and lubrication effect of surface texture,the optimized Ni60A+35%WC wear-resistant coating surface is processed with different sizes of microporous texture.In terms of tribological properties,the textured surface has a good antifriction effect,which is obviously affected by lubrication in the liquid environment,and the friction reduction performance ofφ300μm andφ400μm micropores is the best.Meanwhile,the friction performance of wear-resistant coating and textured wear-resistant coating is stronger than that of 65 Mn substrate under high load.In terms of adhesion,the cavitation effect reduces soil adhesion,but the wettability increases first and then decreases with the increase of pore size.The textured surface shows hydrophilicity,and the overall soil adhesion increases.Therefore,it is necessary to deposit hydrophobic coating to change the surface wettability to achieve better viscosity reduction effect.（3）Four kinds of Ti₆₇Al₃₃coatings with different process parameters were deposited by physical vapor deposition technology,and the effects of target current and bias on the viscosity reduction energy of the coatings were studied.The results show that the best viscosity reduction can be achieved when the target current is 40 A and the bias voltage is20 V.Therefore,Ti₆₇Al₃₃coating of this process was deposited on the surface of Ni-based WC coating sample with microporous texture,and wear and viscosity reduction were studied.Ni60A+35%WC coating achieved wear resistance,improved the service life of65 Mn steel matrix,and increased the duration of wear and viscosity reduction of surface microporous texture.Ti₆₇Al₃₃coating can solve the problem of surface free energy increase after microporous texture and play a certain wear resistance effect.According to the microhardness and tribological properties test,the hydrophobic coating slightly improves the hardness of the microporous wear-resistant coating,and the hardness of the sample withφ100μm is the highest.In the tribological tests,the tribological properties of the sample withφ100μm are the best.The contact Angle test and adhesion test show that Ti₆₇Al₃₃coating can effectively reduce the surface free energy of the microporous texture.Theφ100μm andφ200μm samples showed better viscosity reduction than the single coating samples.In general,the texture composite coating withΦ100μm size microporous texture and depositing target current 40 A and bias 20 V Ti₆₇Al₃₃coating on Ni60A+35%WC wear-resistant coating was the best.