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RISS 인기검색어
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- 저자 : Tao Jiang(강타오) (검색결과 2 건)
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Hyunseok Choi(최현석),Tao Jiang(강타오),Hong Seok Kim(김홍석) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.4
Titanium alloys are widely used in orthopedic devices because of their low density, high tensile strength, good corrosion resistance, and biocompatibility. However, since titanium and its alloys have inferior surface properties in terms of friction and wear resistance, there are still limitations in their application to the parts where sliding contact occurs. In this study, SiC nanoparticles were laser clad on the Ti-6Al-4V surface to simultaneously improve the friction and wear properties of the titanium alloys. Laser cladding was performed by changing the ambient conditions and laser parameters. The effect of process variables on the microstructure, hardness, and friction coefficient of the coating layer was analyzed. SiC nanoparticles reacted with the Ti element in the molten pool to create the reinforcement phases such as TiC and Ti<sub>5</sub>Si<sub>3</sub>. Oxygen supplied in the laser cladding process contributed to significantly reducing the coefficient of friction of the Ti-6Al-4V surface by creating the oxide phases such as TiO<SUB>2</SUB> and SiO<SUB>2</SUB>. Consequently, after the laser surface treatment of SiC nanoparticles in an oxygen environment, the hardness of Ti-6Al-4V improved by about three times and the coefficient of friction was reduced by more than 80%.
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SiC 나노파우더로 레이저 클래딩 된 Ti-6Al-4V 합금의 표면 물성에 대한 환경 가스 및 공정 변수의 영향
최현석(Hyunseok Choi),강타오(Tao Jiang),김홍석(Hong Seok Kim) 한국생산제조학회 2022 한국생산제조학회지 Vol.31 No.1
The aim of this study was to improve the surface properties of a Ti-6Al-4V alloy using laser cladding with SiC nanopowders. In an argon environment laser cladding, the TiC and Ti<SUB>5</SUB>Si₃ reinforcement phases were generated, and the hardness of the coating layer was improved up to three times. Increasing the laser scanning speed further improved the hardness as the grain size decreased. However, the friction characteristics did not improve as the reinforcement phases on the surface fell off during sliding contact and caused wear and tear. In an air environment laser cladding, an increase in the hardness due to the reinforcement phases and an improvement of the friction characteristics due to the formation of the oxide phases were observed simultaneously. The coefficient of friction was reduced by up to 91%. In addition, the quantitative correlation between the friction coefficient and the oxygen content change on the coating surface was analyzed.
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