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세라믹의 마멸기구에 관한 파괴역학적 연구 -마멸실험 결과의 고찰-
김석삼,김재호 대한기계학회 1990 대한기계학회논문집 Vol.14 No.3
Analytically induced wear mechanism of elastic body under Hertzian contact is applied in acutual wear test of ceramics. There are two types of wear in ceramics, a large scale wear and a small scale wear. The large scale wear is commensurable with Hertzian contact area and the small scale wear with real contact area. Nondimensional parameter, S$_{c}$, is introduced and fully examined to estimate or predict wear rate of ceramics. Ceramic wear for S$_{c}$.leq.0.8 is in small scale wear and for S$_{c}$;geq.1.6 in large scale wear. wear. 본 연구에서는 전보에서 수행한 이론해석의 결과를 실험결과에 적용하여 세라 믹의 마멸형태를 파괴역학적 견지에서 고찰하고, 새로운 세라믹의 마멸이론과 마멸평 가를 위한 파라메타를 제안하고자 한다.
김석삼,서창민,박준목 대한기계학회 1995 대한기계학회논문집 Vol.19 No.3
The wear characteristics and wear mechanisms in TiN coating deposited on high speed steel and alloy tool steel by ion plating were investigated. Pin on V-block wear tester was used for a wear test method. The specimen was composed of three kinds of high speed steel and alloy tool steel which had different hardness by changing the heat treating condition. Three kinds of coating thickness were also applied to each specimen. Microscopic observation of worn surfaces was made by SEM. The scratch test of coating surface by the ion plating showed that critical load to break the coating interface was greater than 50N. The critical load increased with both substrate hardness and coating thickness. The wear resistance of TiN coated high speed steel became 10 times greater than that of non-coated ones. SEM observation showed that leading edge of contact was compressive and trailing edge was under maximum tensile stress and then surface cracking broke out perpendicular to sliding direction.
세라믹 마멸에 있어서의 새로운 파라메터 제안 (I) 질화규소와 지르코니아의 마찰$\cdot$마멸 특성
김석삼,김상우,Hsu, S. M. 대한기계학회 1993 대한기계학회논문집 Vol.17 No.6
Under unlubricated condition, the friction and wear tests of silicon nitride and zirconia manufactured by HIP were carried out at room temperature. The wear resistance of silicon nitride was superior to that of zirconia under low load, whereas the wear resistance of zirconia was superior to that of silicon nitride under high load. Wear model of ceramic was suggested by the microscopic SEM observation of worn surfaces and debris. Theoretical analysis and discussions based on linear fracture mechanics were made out about this ceramic wear model. From the theoretical analysis, a new nondimensional parameter, Scf, was introduced to estimate wear rate of ceramics. This new nondimentional parameter consists of contact pressure, surface defect of contact material, frictional coefficient and fracture toughness. 본 연구에서는 최신기법에 의해서 제조된 HIP제 질화규소와 지르코니아를 실험재료로 하여 무윤활하에서의 미끄럼마찰·마멸실험을 수행하여 마찰·마멸특성을 규명하고, SEM을 이용한 마멸면의 미시적 관찰을 통해서 세라믹의 마멸기구를 조사하 여 세라믹마멸기구의 마멸모델을 제시하고자 한다. 제시된 마멸모델에서 파괴역학을 도입하여 이론해석과 고찰을 수행하여 보다 실용적인 세라믹의 마멸율울 평가할 수 있 는 새로운 무차원 파라메터를 제안하고자 한다.
金石三 경북대학교 공과대학 1982 工大硏究誌 Vol.11 No.-
Friction and wear tests of dry sliding were performed on alloyed tool steel (STS 3) to investigate tribometric characteristics and surface characteristics. The results obtained are as follows: 1) The coefficient of friction decreases with the normal load and nearly independent on sliding velocity (μ=0.3 - 0.7) 2) The average hardness of wear surface increases with the normal pressure, but it stays constant above the normal pressure of 0.45 ㎏/㎟ 3) In a given wear regime, the abraded wear volume of STS3 increases linearly with normal load.