| Title |
Research Paper - Surface Treatment - : A Study on the Thermal Spraying Characteristics of Mechanically Alloyed Ni - base Self - fluxing Alloy Powders and Wear Characteristics of Coating Layer |
| Authors |
서성문(Seong Moon Seo); 이보영(Bo Young Lee); 이상율(Sang Yul Lee) |
| Abstract |
Mechanical alloying(MA) powders were prepared by single shaft attritor mill under Ar gas atmosphere. Powders milled for more than 35hours showed Ni solid solution and unimodal particle size distribution having the mean powder size of 12 ㎛ in diameter. These powders milled for 35hours were used for flame spraying. The optimum condition for the flame spraying of Ni-based self-fluxing powders manufactured by mechanical alloying for 35hours was studied and the coating produced under the condition of a spraying distance of 15 ㎝ gave rise to the best results. Sliding wear behaviors of the coating produced by fame spraying on cast iron substrate were investigated by ball-ondisc type wear test using an AISI 52100 steel ball as a counter material. Volumetric wear rates of coatings and substrate were calibrated using the Habig`s equation by measuring a wear volume of ball and disc. Compared with cast iron substrate, relative volumetric wear rate of coatings showed significant improvement on the wear resistance. |