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임정일,강만석,김교한,김석삼 대한치과기재학회 1999 대한치과재료학회지 Vol.26 No.4
The friction and wear characteristics and wear mechanisms of dental compomers were investigated. Compomers such as Compoglass, F2000, Elan and Dyract AP were selected as specimens. Surface characteristics was examined by SEM and contents of glass fillers in specimens were determinated in order to analyze the effect of the fillers in fraction and wear characteristics. Ball on flat wear tester was used for a wear test. Friction and wear tests are carried out at room temperature. The friction coefficient of F2000 was quite high relatively, and the wear resistance of Compoglass and Dyract AP was better than that of F2000 and other specimens at the same experimental condition. The main wear mechanism is brittle fatigue of glass fillers, plastic flow and abrasive wear by crack propagation.
Tribological Evaluation of Dental Composite Resins Containing Prepolymerized Particle Fillers
Ren, Jing-Ri,Kim, Kyo-Han,Kim, Seock-Sam The Korean Society of Mechanical Engineers 2001 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.15 No.6
The Tribological evaluation of commercial dental composite resins containing prepolymerized particle fillers was investigated. Composite resins such as Metafil, Silux Plus, Heliomolar, and Palfique Estelite were selected as specimens. In the wear tests, a ball-on-flat wear test method was used. The friction coefficient of Metafil was quite high. The wear resistance of Silux Plus and Palfique Estelite was better than that of Metafil and Heliomolar under the same experimental conditions. The main wear mechanism of the composite resins containing prepolymerized particle fillers was abrasive wear caused by the brittle fracture of the prepolymerized particles and the debonding of the filler and the matrix.
플라즈마 코팅한 주조용 알루미늄합금의 마찰 및 마멸특성
채영훈,임정일,박준목,김석삼,Chae, Young-Hun,Ren, Jing-Ri,Park, Jun-Mock,Kim, Seock-Sam 대한기계학회 1997 大韓機械學會論文集A Vol.21 No.5
The wear characteristics and wear mechanisms of plasma sprayed Al/sub 2/ O/sub 3/-40%TiO/sub 2/ and Cr/sub 2/O/sub 3/ deposited on casting aluminum alloy(AC4C) were investigated. Specimens were processed for various coating thicknesses. Ball on disk type wear tester was used for wear test. The scratch test on plasma sprayed coating surface showed that critical load to break the coating layer was greater than 40 N. The critical load increase with the increase of coating thickness of specimens. The friction coefficient of Cr/sub 2/O/sub 3/ coating layer was less than that of Al/sub 2/O/sub 3/-40%TiO/sub 2/ coating layer. The wear resistance of Cr/sub 2/O/sub 3/ coating layer was greater than that of Al/sub 2/O/sub 3/-40%TiO/sub 2/ coating layer. Microscopic observation of worn surfaces was made by SEM. SEM observation showed that the main mechanism of wear for Al/sub 2/O/sub 3/-40%TiO/sub 2/ coating layer was abrasive wear under 50 N. For the case of Al/sub 2/O/sub 3/-40%TiO/sub 2/ coating layer, as the surface cracks perpendicular to sliding direction propagated, the wear debris was generated in wear track. However, the main mechanism of wear for Cr/sub 2/O/sub 3/ coating layer was brittle fracture under 150 N.