Add an appropriate amount of PTFE particles into the acidic electroless nickel plating solution and perform mechanical stirring. After Ti-6A4V undergoes pretreatments such as degreasing, oxide film removal, and activation, electroless Ni PTFE can be carried out. Coating PTFE directly on the Ti alloy surface has low bonding strength and is easy to peel off. The obtained NiPTFE composite The volume content of PTFE in the layer reaches 10% to 15%, and the coating has a gray metallic luster.
Based on the above reasons, the article will use electroless Ni ; P as a matrix to support PTFE particles. PTFE has a very low friction factor and has a good anti-friction effect. Observation of the coating by SEM shows that the PTFE particles are distributed evenly in the coating, and the coating is flat without pores. Its tribological characteristics are closest to human cartilage tissue. Electroless Ni-P-PTFE plating requires PTFE particles to be evenly dispersed in the solution. Its wear factor increases with sliding The distance increases but remains basically unchanged, and the fluctuation of the friction factor is also very small.
After the Ti-6A I-4V alloy is treated by electroless Ni-P-PTFE plating, the friction and wear properties are significantly improved. A Ni-P-PTFE composite coating was deposited on the surface of the Ti alloy to obtain a self-lubricating and low friction coefficient surface modification layer on the surface of the Ti alloy, and the friction and wear properties of Ni-P-PTFE were studied.. The process conditions of PTFE are as follows: pH value 4. This experiment uses PTFE particles with a particle size of about 0. ;PTFE shows high wear resistance, The amount of wear reaches a stable value in a short time, and then shows a downward trend as the wear time increases.6～5.5 tJm. It is currently the best artificial solid antifriction material.5cm, the load is 50N, and the sliding speed is 1 m/s. However, PTFE itself has low strength, extremely low surface energy, and poor affinity with metals.0; temperature 85℃.
The added surfactant is a mixture of nonionic surfactant and cationic surfactant, Not only makes the PTFE PTFE coated tape Manufacturers particles in the plating solution have good suspension, but also makes the PTFE particles positively charged, which promotes the adsorption of PTFE particles on the Ti-6A1\u0026mdash;4V surface and the co-deposition with Ni-P. Electroless Ni-P. The test is carried out under dry friction conditions. Therefore, coating PTFE on the alloy surface will greatly improve Ti The sliding friction properties of the alloy.05 to 0. The friction and wear test is in the MM-200 wear test It is carried out on the machine, the pair of grinding couple is GCrl 5, the radius is 23.PTFE has excellent chemical stability and good self-lubricating properties