• Title/Summary/Keyword: Wear of Ceramic

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Transition Condition of Microscopic Wear Mode for TiN Coating by SEM Tribosystem (SEM Tribosystem에 의한 TiN피막의 미시적 마모형태의 천이 조건)

  • Moon, Bong-Ho
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.10 no.3
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    • pp.100-107
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    • 2011
  • To evaluate the wear characteristics of very thin ceramic coated layer, it is very important to investigate its wear process in great detail. An effective method for investigating the wear of a thin layer is the observation of wear process in microscopic detail, using in-situ system. In this study, based on the SEM Tribosystem as in-situ system, the microscopic wear mode of TiN coatings was investigated in repeated sliding. Consequently, four modes were revealed for TiN coatings: Ploughing, powder formation, flake formation and coating delimitation. Sc(Severity of contact) can clarify transition condition of those microscopic wear modes.

Friction and Wear Behavior of Ceramics under Various Sliding Environments (세라믹 재료의 미끄럼 환경 변화에 따른 마찰 및 마멸 거동)

  • 장선태;이영제
    • Tribology and Lubricants
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    • v.11 no.3
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    • pp.11-23
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    • 1995
  • The friction and wear behavior of $Al_{2}O_{3}$, SiC, and $Si_{3}N_{4}$ under the different sliding conditions were investigated. The cylinder-on-disc wear tester was used for a wear test method. Using the servo-motor, the sliding speed did not alternate due to the frictional forces. Three kinds of loads were selected to watch the variation of the wear rates and the frictional forces under a constant speed. Three kinds of sliding conditions were used to see the effects of the oxidation and the abrasion. The dominant wear mechanisms of $Al_{2}O_{3}$ were the abrasion and the formation of transfer layers. The abrasion has a great effect on the wear of SiC. The wear of $Si_{3}N_{4}$ was due to the asperity-failure and the oxidation. Also, the wear rate of each ceramic is shown to be related to the frictional power provided to the tribological system.

Improvement of Wear Resistance of Aluminum by Metal-Ceramic Particle Composite Layer (알루미늄표면에 금속-세라믹입자 복합첨가에 의한 내마모성개선)

  • ;;;中田一博;松田福久
    • Journal of Welding and Joining
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    • v.15 no.6
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    • pp.96-104
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    • 1997
  • The present study was aimed to correlate the microstructure and the hardness as well as the wear resistance of the metal-ceramic particulated composite layer on the pure Al plate. The composite layers were constructed by the addition of TiC particles on the surface of Al-Cu alloyed layers by PTA overlaying process. Initially, the Al-Cu alloyed layers were achieved by the deposition of Al-(25 ~ 48%) Cu alloys on the pure Al plate by TIG process. It was revealed that TiC particles were uniformly dispersed without any reaction with matrix in the composite layer. The volume fraction of TiC particles (TiC V F) increased from 12% to 55% with increasing the number of pass of composite layer. Hardnesses of (Al-48%Cu + TiC (3&4layers)) composite layer were Hv450 and Hv560, respectively, due to the increase of TiC V/F. Hardnesses of (Al-Cu + TiC) composite layers decreased gradually with insreasing temperature from 100$^{\circ}$C to 400$^{\circ}$C, and hardnesses at 400$^{\circ}$C were then reached to 1/5 - 1/10 of room temperature hardness depending on the construction of composite layers. The Specific wear of (Al + Tic) layer and Al-48%Cu alloyed layer decreased to 1/10 of the of pure Al, while the specific wear of (Al-48%Cu + TiC (4 layers)) composite layer exhibited 1/15 of that of steel such as SS400 and STS304.

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Investigation of Micro-tribological Properties of Coated Silicon Wafer under Light Load (코팅된 실리콘웨이퍼의 미소 마찰마멸특성에 관한 연구)

  • 차금환;김대은
    • Tribology and Lubricants
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    • v.15 no.1
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    • pp.29-38
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    • 1999
  • In recent years, the tribological behavior of coated ceramic material has been the issue of much interest. Particularly, the understanding of the tribological performance of thin film under light load is important for its potential in applications of MEMS. The friction and wear behavior of ceramic material that occur at light load depends on several factors such as surface roughness, contact area and material properties. In this work, the tribological behavior of coated silicon under light load and low speed was investigated. Particularly, the effects of coated materials, humidity and undulated surface were also studied. The results show that the effect of humidity on fiction was influenced by the apparent area of contact between the two surfaces. Also both adhesive and abrasive wear occurred depending on the sliding condition. Finally, undulations on the silicon wafer were found to be effective in trapping wear particles and resulted in the reduction of friction.

Mechanical and Tribological Properties of $\beta-Sialon/SiC$ Whisker Composite ($\beta-Sialon/SiC$ Whisker 복합재료의 기계적 물성 및 마찰 마모 특성 연구)

  • 김호균;소유영;김인섭;이병하
    • Journal of the Korean Ceramic Society
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    • v.31 no.11
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    • pp.1259-1264
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    • 1994
  • $\beta$-Sialon has been regarded as one of promising materials showing high strength, fracture toughness, corrosion resistence and wear resistence. The improvement of the fracture toughness and tribological properties of $\beta$-Sialon (Z=1) has been attempeted by fabricating the $\beta$-Sialon/ SiC whisker composite. Each of green body composed of following ingredients, i.e., Si3N4, AlN, Y2O3 nd SiC, respectively, was first fired at 178$0^{\circ}C$ for 3hrs in N2 atmosphere and then post-HIPed at 173$0^{\circ}C$ for 1 hr under 170 MPa for N2 gas pressure. The fracture toughness, flexural strength and tribological properties increased with increasing SiC whisker content, despite the reduction of the relative density and hardness. $\beta$-Sialon/15 vol% SiC whisker showed a significant enhancement of wear resistance compared to the monolithic $\beta$-Sialon. The addition of SiC whisker caused the reduction of the density and hardness, but induced the increment of wear resistance.

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Microstructure and Tribological Characteristics of AlSi-Al$_2$O$_3$ Composite Coating Prepared by Plasma Spray (플라즈마 용사에 의한 AlSi-Al$_2$O$_3$ 복합재료 코팅층의 미세조직 및 마찰.마모특성)

  • Min Joon-Won;Yoo Seung-Eul;Kim Young-Jung;Suhr Dong-Soo
    • Journal of Welding and Joining
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    • v.22 no.5
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    • pp.46-52
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    • 2004
  • AlSi-Al$_2$O$_3$ composite layer was prepared by plasma spray on steel substrate. The composite powder for plasma spray was prepared by simple mechanical blending. The wear resistance of the composite layers and matrix aluminum alloy were performed in terms of size distribution of ceramic particles. Friction coefficients of AlSi were decreased with incorporation of $Al_2$O$_3$. The tribological properties of coated layers were affected by the size of incorporated $Al_2$O$_3$ particle. The reinforcement of $Al_2$O$_3$ particle into aluminum alloy matrix decreased the friction coefficient as well as wear loss.

The Effect of Nitrogen Plasma Treatment on Tribological Behaviors of Plasma-sprayed Zirconia Coatings

  • Lim, Dae-Soon;Shin, Jong-Han;Lee, Jung-Yeob;Cho, Chang-Hee
    • Journal of the Korean Ceramic Society
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    • v.38 no.7
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    • pp.602-607
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    • 2001
  • Zirconia powder containing 3 mol% yttria (3Y-PSZ) was casted on the cast iron substrate by plasma spraying method. Coated specimens were then heat treated at 500$\^{C}$ in nitrogen plasma. Wear tests were performed on nitrogen heat treated and non heat treated samples at temperatures from 25$\^{C}$ to 600$\^{C}$. Wear results showed that the friction coefficient and the wear loss of both the treated and the non-treated samples showed maximum value at 400$\^{C}$. These results were explained by low temperature thermal degradation due to the monoclinic transformation. Nitrogen plasma treatment significantly improved the tribological performance. The effect of nitrogen heat treatment on tribological behavior was explained by the increased micro-hardness and decreased monoclinic faction.

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Studies on Wear Mechanism of High Alumina Brick for Arc-furnace Roof (아-크로 천정용 고알루미나질 벽돌의 용손기구에 관한 연구)

  • 허삼덕;오기동
    • Journal of the Korean Ceramic Society
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    • v.23 no.2
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    • pp.55-63
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    • 1986
  • In variuos physcial and chemical cause of damage of refractories for steel makin the clarification of the wear mechanism of brick is situated on important factor. In the present paper the wear mechanism of high alumina brick for the arc-furnace roof were inves-tigated by means of XRD, EPMA. SEM and microscopy. The results obtained were summerized as follows : (1) The altered layers which exist in high alumina brick used for arc-furnace roof were verified by mineral chemical analysis and EPMA. (2) The diffusion of materials combined with slag dust and iron oxide from furnace atmosphere in high basic process from hot face to interior was verified. (3)Activation energy for the synthesized slag permeated into the unused brick texture was 47-51 kcal per mole.

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Studies on Film Growth and Mechanical Properties of TiN by Chemical Vapor Deposition (화학증착에 의한 TiN 박막의 제조 및 기계적 성질에 관한 연구)

  • 김시범;김광호;천성순
    • Journal of the Korean Ceramic Society
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    • v.26 no.1
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    • pp.21-30
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    • 1989
  • Titanium Nitride (TiN) was deposited onto the SKH9 tool steels by chemical vapor deposition (CVD) using a gaseous mixture of TiCl4, N2, and H2. The effects of the deposition temperature and input gas composition on the deposition rate, microstructure, preferred orientation, microhardness and wear resistance of TiN deposits were studied. The experimental results showed that the TiN deposition is thermally activated process with an apparent activation energy of about 27Kcal/mole in the temperature range between 1200$^{\circ}$K and 1400$^{\circ}$K. As H2/N2 gas input ratio increased, the deposition rate increased, showed maximum at H2/N2 gas input ratio of 1.5 and then decreased. Mechanical properties such as microhardness and wear resistance have close relation with the microstructure and preferred orientation of TiN deposits. It is suggested that the equiaxed structure with random orientation increases the microhardness and wear resistance of TiN deposits.

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Tool-Wear Characteristics in Turning of STS 304 (STS 304 선삭시의 공구마멸 특성)

  • 이재우
    • Journal of the Korean Society for Precision Engineering
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    • v.20 no.10
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    • pp.56-64
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    • 2003
  • The effect of tool geometry on the tool wear in turning the austenitic stainless steel, STS 304 was investigated. The wear of TiN-TiCN-TiC-TiAlN coated tungsten carbide tool was the smallest, showing larger wear in the order of Si-Al-O-N ceramic, TiN coated tungsten carbide, TiN- TiCN- TiN coated tungsten carbide, TiC-TiN cermet and M20 tungsten carbide tools at the same cutting conditions. The S-type tool of M20 with the larger side cutting edge angle showed the smallest tool wear in all tests due to preventing the groove wear of the side cutting edge. The wear of the S-type tool with the rake angle of $15^{\circ}$ became smaller than with that of $-5^{\circ}$, but the tool with the nose radius of 0.8mm did not perform much better with increasing the rake angle.