Abstract
A vanadium carbide (VC) layer was created by thermal diffusion (TD) method to improve the wear resistance of the pinch roller made of SKD11, which is applied to the production of deformed prestressing concrete (PC) steel bars. To create the VC layer by the TD coating method, the base material of SKD11 material was immersed in a molten vanadium at 1,000°C for 10 hours, and then the surface was polished to prepare a specimen. The VC coating layer showed a production rate of 0.6-0.9 μm/hr, and a VC layer of 0.8 μm was formed during 10 hours of immersion. As a result of performing a ball on disk wear test to measure the specific wear of the base material SKD11 and the VC layer, it was 2.02×10<SUP>-4</SUP> ㎟/N and 0.73×10<SUP>-4</SUP> ㎟/N, respectively, and the wear amount of the VC layer was only 36% worn compared to the base material. The coefficient of friction did not show a significant difference between the base material and the VC layer, 0.683 and 0.644, respectively. When the pinch roller to which the VC layer was applied was applied to an induction heating heat treatment machine that manufactures a deformed PC steel bar, it was confirmed that the wear resistance performance was twice that of the base material.
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