| Aiming at the key technical requirements of prolonging the service life of the die in the plastic forming of aluminum alloy,based on the design concept of wear resistance,adhesion resistance and wear reduction,tisicn self-lubricating coating was constructed by multi arc ion plating equipment,which further changed the mechanical and chemical properties of the coating itself.The self-lubricating performance of the die was made by the coating,and the friction coefficient of the die was reduced,At the same time,reduce the aluminum alloy bonding on the mold,so as to improve the life of the mold.In this paper,by adjusting the acetylene flow ratio to change the content of elements in tisicn coating,the strong correlation between acetylene flow ratio and C element content is revealed,and acetylene flow ratio is used to replace c element content for analysis.Focus on the core issues such as strengthening and toughening,anti adhesion and anti-wear properties and anti-corrosion properties;The effects of acetylene flow rate ratio on the composition elements,surface cross-section microstructure,existing form of C element,hardness and elastic modulus of tisicn coating were investigated;In the friction and wear process,the internal relationship between the increase of acetylene flow ratio and the friction coefficient,microcrack initiation,adhesion rate and wear rate of the coating was discussed.The polarization curve and impedance curve of the coating with different acetylene flow ratio during the corrosion process were clarified,and the internal reason for the improvement of corrosion resistance was discussed.The results are as follows:(1)The element distribution of tisicn coating is uniform,and it is not affected by defects.The half value of acetylene flow ratio is basically equal to the value of C element content.The diffraction peak of tisicn coating is mainly composed of tin and tic.With the increase of acetylene flow rate,the diffraction peak position continuously shifts from tin to tic,and the graphite structure formed by C element changes from scratch to more.(2)With the increase of acetylene flow rate,the amount and volume of particles on the surface of tisicn coating increase,and the pits decrease;The columnar structure disappeared and became dense gradually;The roughness first decreases and then increases,and reaches the minimum when the acetylene flow ratio is 50%.The hardness and elastic modulus first increase and then decrease,and both reach the maximum when the acetylene flow ratio is 10%.(3)The friction coefficient of tisicn coating decreases with the increase of acetylene flow rate.The coating with 30% acetylene flow rate has self-lubricating effect,and the friction coefficient of the coating with 50% acetylene flow rate changes greatly.The friction coefficient reaches the minimum when the acetylene flow rate is 70%.The wear scar width increases first and then decreases.When the proportion is 10%,the wear scar is the widest.(4)The microcracks increase first and then decrease.When the proportion is 10%,the microcracks are the most serious.When the proportion is more than 50%,there will be no microcracks during friction.The corresponding change of wear scar morphology is only manifested in the decrease of the height of large particles and spalling;When the proportion is 0%,10% and 30%,the bonding aluminum ball structure is serious.At this time,the friction process is mainly bonding,supplemented by wear.When the proportion is 50% and above,the bonding aluminum ball structure is greatly reduced.At this time,the coating is mainly wearing,with only a small amount of bonding.The coating with 70% proportion has the best anti bonding performance. |
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