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가열 롤에서 플라즈마 TiO<sub>2</sub>-NiCr 용사피막의 특성
강태구,진민석,고영봉,김태형,조상흠,박정식,김종철,박경채,Kang, Tae-Gu,Jin, Min-Seok,Ko, Young-Bong,Kim, Tae-Hyung,Cho, Sang-Hum,Park, Jung-Sik,Kim, Jong-Chul,Park, Kyeung-Chae 대한용접접합학회 2007 대한용접·접합학회지 Vol.25 No.4
The heating unit of direct heating method manufactured as the plasma spray coating of $TiO_2/NiCr$ conductive heating material on the surface of heating unit in order to improve the disadvantages of indirect heating method. $TiO_2$ and NiCr (80wt.%Ni-20wt.%Cr) that had the properties of conduction and heating was chosen for the conductive heating material. The compositions of the composite powders were studied $TiO_2-30wt.%NiCr\;and\;TiO_2-10wt.%NiCr$. As the heating temperature was increased, the hardness of heating layer was increased because of the fine microstructure and the decrease of porosity. The adhesion strength was decreased for coarsening and connection of voids in the insulation layer, and the electrical resistivity of heating layer was increased for fine crack formation and growth. In this study, the best efficient sprayed coatings with heating unit was concluded as the plasma sprayed $TiO_2-10wt.%NiCr$ coatings that was heat treated at $300^{\circ}C$.