Ability Research And Experiment Of The High Wear-resistant Compounded Coating Which Improved By Appending CNTS

Nawdays the society request the mechanical devices have more and more high wear resistant, and the the material wear resistant performance under the complex operating mode has been paid more attention.Therefore looking for one kind of the coatings which has high wear-resisting low friction coefficient to become the hot spot in the present studies. The carbon nanometer tube is a kind of new carbon material. This nanometer structure is hollow and Seamless tubular structure, which is composed of single layer or the multilayer curling flake of graphite. Because the structure characteristic of carbon nanometer tubes similar with graphite, and which has smaller density, higher intensity and higher hardness characteristic. Therefore the carbon nanometer tubes could be the fine performance lubricant, and will be the strengthened material with good firctional performance. This article uses the carbon nanometer tubes as strengthened body, carries on studies the CNTs\CoW coating preparation craft and the coating performance.Added the different carbon nanometer tubes content in the cobalt tungsten alloy deposition fluid foundation, prepares CNTs\CoW compound coating, discussed the current density and the content of carbon nanometer tubes influence for the quantity of the coating organization, thickness and degree of hardness as well as the agitation, the temperature, the PH value influence to the deposit this coating performance.This experiment uses the acid treatment and the ball grinding method to a carbon nanometer tube carries on the pretreatment, which made the carbon nanometer tubes not have obvious reunion phenomenon and have the good dispersivity. The test result indicated that, when the current density is 4A/dm2, selects the method which the manual agitation and the air agitation unifies, PH value.in 5~7 may obtain the good organization and the performance coating Uses QUANTA200 SEM to analysis superficial appearance of the coating indicated that the compound coating organization relative compaction, nearly has the micro crackles, the degree of superficial crystal grain refinement is obvious. Uses EDVX energy dispersive spectrometer to analyse the coating ingredient, the carbon element content obvious got higher, which explains that carbon nanometer tubes indirectly by hosted grain in coating. Uses the MH-3 microhardness scale determination degree of hardness of the coating, which result indicated: the content of carbon nanometer tube that supplement in the bath is 2g/L, which has the obvious increase to the coating degree of hardness. But with the increasing of the carbon nanometer tubes content , hardness of the coating decreased. Simultaneously, as a result of the carbon nanometer tubes fine self lubrication ability, which plays the anti-friction role in the friction attrition process. Added 2g/L of carbon nanometer tubes in the composite coating for friction and wear testing, the friction coefficient was reduced, that the addition of carbon nanotubes can effectively reduce the coefficient of friction, wear-resistant coatings improve performance.Which resort indicated that the friction and attrited performance of CNTs/CoW compound coating is superior to ordinary cobalt tungsten coating.