서지주요정보
질화규소 세라믹스의 마찰 및 마모 거동에 관한 연구 = A study on friction and wear behavior of $Si_3N_4$ ceramics
서명 / 저자 질화규소 세라믹스의 마찰 및 마모 거동에 관한 연구 = A study on friction and wear behavior of $Si_3N_4$ ceramics / 이기현.
저자명 이기현 ; Lee, Kee-Hyun
발행사항 [대전 : 한국과학기술원, 1994].
Online Access 원문보기 원문인쇄

소장정보

등록번호

8005010

소장위치/청구기호

학술문화관(문화관) 보존서고

DPE 94019

SMS전송

도서상태

이용가능

대출가능

반납예정일

초록정보

The wear properties of two types of silicon nitride($Si_3N_4$) ceramics exposed to high(above RH 90%) and low humidity(below RH 10%) were examined experimentally at various sliding speeds(0.25 to 4.0 m/s). AISI 52100 Bearing steel was used as the disk material under pin-on-disk type sliding conditions. The wear rate of the pressureless sintered plus hot isostatic pressed(HIP+PLS) $Si_3N_4$ was slightly lower than that of the pressureless sintered(PLS) $Si_3N_4$. It was observed that humidity and sliding speed markedly affect the wear properties of $Si_3N_4$. The wear rate was higher at a high humidity than a low humidity. The highest wear rate was obtained with a high humidity and low sliding speed. As the sliding speed was increased, the wear rate was decreased and the effect of humidity on the wear rate of the $Si_3N_4$ was reduced. Surface of the pin became smoother at low sliding speed. As the sliding speed was increased, deep and uniform grooves were found on the surface. The smooth surface is considered to be the result of micro-plowing and polishing process by the mechanical action of the water and small hard particles. Protection film was not formed on the surface of the pin. The result that the $Si_3N_4$ pin showed a higher wear rate under high humidity was explained as follows. First, chemically adsorbed moisture on the sliding surface of the $Si_3N_4$ pin has decreased the microhardness of $Si_3N_4$ pin surface and thus the wear rate of the $Si_3N_4$ pin by the plowing action of the bearing steel disk has been increased. Another effect of high humidity is the increased plowing action of $Fe_2O_3$ particles formed as a result of the oxidation of bearing steel, which can be accelerated by the presence of moisture. An increase in the sliding speed is supposed to have reduced the humidity effect on the wear rate of $Si_3N_4$ pin by raising the bulk temperature of the bearing steel disk and the temperature at the pin-disk contact point. Also, with the rise in sliding speed, hardness decrease due to the temperature rise at the contact point should have been much larger for the bearing steel disk than for the $Si_3N_4$ pin, leading to a decrease in the wear rate of $Si_3N_4$.

서지기타정보

서지기타정보
청구기호 {DPE 94019
형태사항 xi, 171 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Kee-Hyun Lee
지도교수의 한글표기 : 김경웅
지도교수의 영문표기 : Kyung-Woong Kim
학위논문 학위논문(박사) - 한국과학기술원 : 정밀공학과,
서지주기 참고문헌 : p. 161-171
주제 Mechanical wear.
Fluid-film bearings.
Friction.
Rolling contact.
세라믹. --과학기술용어시소러스
구름 마찰. --과학기술용어시소러스
마모. --과학기술용어시소러스
베어링 요소. --과학기술용어시소러스
세라믹 성형. --과학기술용어시소러스
Silicon nitride.
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