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Synthesis of $WS_2$ Solid Lubricant and Its Application to Ball Bearing

$WS_2$고체윤활제의 합성 및 구름베어링 적용

  • 신동우 (경상대학교 재료공학부 무기복합재료연구실, 첨단소재연구소) ;
  • 윤대현 (경상대학교 재료공학부 무기복합재료연구실, 첨단소재연구소) ;
  • 최인혁 (한화기계(주) 연구소) ;
  • 김경도 (경상대학교 재료공학부 무기복합재료연구실, 첨단소재연구소) ;
  • 정진수 (중소기업진흥공단 중소기업연수원) ;
  • 정용선 (한양대학교 세라믹 소재연구소)
  • Published : 1999.03.01

Abstract

The processing conditions fur the synthesis of platelet W $S_2$ lubricant powder through a solid-gas reaction were optimized. The mixture of tungsten and sulfur powders were sealed in a vacuum of 10$^{-6}$ torr, prior to heat-treating at 85$0^{\circ}C$ fur 8 days. The reaction product showed a well-developed platelet W $S_2$ powder with an average size of 3.8 ${\mu}{\textrm}{m}$. The TGA/DTA analysis of the synthesized W $S_2$ powder was performed up to 120$0^{\circ}C$ at a rate of 1$0^{\circ}C$/min in flowing air (100 ${\mu}{\textrm}{m}$/min) atmosphere. The weight loss was about 6% up to 120$0^{\circ}C$ compared to the original weight. A rapid weight loss of about 5% occurred in the temperature range of 44$0^{\circ}C$ to 66$0^{\circ}C$ and an exothermic peak observed due to the transition of W $S_2$ to W $O_3$. The synthesized W $S_2$powder was coated on the commercial deep grooved ball bearing (No. 6203) to examine the effect of W $S_2$, coating layer on the noise and endurance of the ball bearing. The level of noise obtained from W $S_2$, coated-ball bearing (56 ㏈) was higher. than the value (32 ㏈) occurred in the case of greece lubrication. The endurance of the ball-bearing assembled after the coating of W $S_2$ powder onto each part increased 50 times compared to the non-coated ball-bearing..

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References

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