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URN etd-0809112-105636 Statistics This thesis had been viewed 2002 times. Download 924 times. Author Kuo-Hao Hsu Author's Email Address No Public. Department Materials Engineering Year 2011 Semester 2 Degree Master Type of Document Master's Thesis Language zh-TW.Big5 Chinese Page Count 76 Title Preparation of Ti3SiC2/TiC reinforced Cu based composites by mechanical alloying technique Keyword copper matrix composites MAX phase mechanical alloying wear resistance Ti3SiC2 Ti3SiC2 wear resistance mechanical alloying MAX phase copper matrix composites Abstract In this study, copper matrix composites reinforced by Ti3SiC2/TiC were prepared by mechanical alloying. The first stage of this study selects pure elemental powders of Ti、Si、C in atomic ratio 3：1：2 to synthesize Ti3SiC2/TiC (85 wt%：15 wt%) powders by mechanical alloying and subsequent annealing treatment. The phase transformation and morphology characteristics of the as-milled and the subsequent heat-treated powders were studied by using XRD and SEM. In the second stage, the synthesized Ti3SiC2/TiC powders were blended with additional Cu powder and subjected to further milling and vacuum hot-pressing at 600 ?C, 80 MPa for 1 h to produce copper matrix composites containing different volume fractions of Ti3SiC2/TiC strengthening phases. The effects of strengthening phase volume fraction on microstructure and mechanical properties of copper matrix composites were investigated. The results indicate that MAX phase Ti3SiC2 cannot be synthesized directly from elemental powders by mechanical alloying, but can be obtained by annealing the milled powders at 1200 ?C for 2 h. The grains of the vacuum hot-pressed bulk composite matrix are refined due to short time blending before consolidation and the strengthening particles are uniformly distributed in the matrix, as compared to the bulk composites without subjecting to short time blending before consolidation. As the strengthening phases increase, the measured hardness of copper matrix composites increases but the relative density and conductivity decreases. The results of wear resistance test revealed that wear resistance of the copper composites can be increased to 2.73 times of pure copper by adding only 10% of strengthening phase. Advisor Committee Hsin-Ming Wu - advisor
Chia-Jung Hu - co-chair
Ko-Shao Chen - co-chair
Pei-Ya Lee - co-chair
Files Date of Defense 2012-07-13 Date of Submission 2012-08-09