Experimental Study on Lubrication Characteristics of Coke Powder under Different Speeds and Loads

The coke powder was introduced into the friction pairs to study the lubrication characteristics of coke powder under the contact state of steel, coke powder and refractory brick under different speeds and loads. The XRD results showed that the coke powder was graphitized. By comparing the effect of non lubrication and coke powder lubrication on the friction interface, it is further proved that the coke powder had good lubrication performance. Furthermore, The forming mechanism of powder layer and the lubrication performance of coke powder under different speeds and loads were investigated. The results showed that under a load of 5MPa, the thickness of powder layer increased and hence the lubricating property of the coke powder as the velocity was increased from 0.05 m/s to 0.40 m/s; while at a speed of 0.55 m/s, the coke powder was thrown out of the friction interface, and severe wear and vibration were observed. Under a speed of 0.40 m/s, powder layer was formed under loads of 5 and 15 MPa; while powder layer was damaged to varying degrees resulting in severe wear under loads of 20 and 25 MPa.