Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)

The Korean Society of Mechanical Engineers (대한기계학회)
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Tribology of Si3N4 Ceramics Depending on Amount of Added SiO2 Nanocolloid

SiO2 나노 콜로이드 첨가량에 따른 질화규소의 트라이볼러지

  • Nam, Ki-Woo (Dept. of Materials Science and Engineering, Pukyong Nat'l Univ.) ;
  • Chung, Young-Kyu (Dept. of UR Interdisciplinary program of Mechanical Engineering, Graduate School, Pukyong Nat'l Univ.) ;
  • Hwang, Seok-Hwan (Dept. of UR Interdisciplinary program of Mechanical Engineering, Graduate School, Pukyong Nat'l Univ.) ;
  • Kim, Jong-Soon (NGE Tech Co. Ltd.) ;
  • Moon, Chang-Kwon (Dept. of Materials Science and Engineering, Pukyong Nat'l Univ.)
  • 남기우 (부경대학교 신소재공학부) ;
  • 정영규 (부경대학교 학연협동기계공학과) ;
  • 황석환 (부경대학교 학연협동기계공학과) ;
  • 김종순 ((주)엔지텍) ;
  • 문창권 (부경대학교 신소재공학부)
  • Received : 2010.09.24
  • Accepted : 2011.01.13
  • Published : 2011.03.01
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Abstract

We analyzed the wear characterization of $Si_3N_4$ ceramics according to the amount of added $SiO_2$ nanocolloid. The test specimen was prepared by hot-press sintering at 35 MPa and 2123 K in an $N_2$ gas atmosphere for 1 h. A wear test was performed with a block-on-ring tester, and the test conditions were as follows: (1) the ring with a diameter of 35 mm had a rotational speed of 50 rpm; (2) the load was 9.8 N; and (3) the temperature was $25^{\circ}C$. The test results show that $Si_3N_4$ ceramics have a friction coefficient of about 1.0 and a wear loss of about 0.02 mm. Of the specimens used this study, the test specimen with 1.3 wt% of added $SiO_2$ nanocolloid has the best wear resistance because it has the lowest friction coefficient and the smallest wear loss. This specimen also has the highest Vickers hardness and bending strength. In this study, the friction coefficient is inversely proportional to the hardness and bending strength.

본 연구는 $SiO_2$ 나노 콜로이드 첨가량에 따르는 $Si_3N_4$ 세라믹스의 마멸 특성을 평가하였다. 시험 편은 35 MPa, 2123 K의 질소 가스 분위기 1시간동안 소결하였다. 마멸 시험은 링 블록 시험기를 사용 하였으며, 시험 조건은 직경 35 mm인 링의 회전속도50 rpm, 하중 9.8 N, 실험중의 대기 온도 293 K이 었다. 세라믹스의 마멸계수는 약 1.0, 마멸손실은 약 0.02 mm이었다. 본 연구에 사용된 시험편 중에서 1.3 wt% $SiO_2$ 나노 콜로이드가 첨가된 시험편은 가장 낮은 마멸계수와 마멸 손실을 나타내어, 최상의 마멸 저항성을 나타내었다. 이것은 가장 높은 비커스 경도와 굽힘 강도를 나타내었다. 마멸계수는 경도 와 굽힘 강도에 역비례 관계를 보였다.

Keywords

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