Characterizations and Synthesis of Cu-C Pseudoalloys Prepared by R.F. Sputter Deposition

• Main Authors: Chung, Chao-Hsi, 鍾朝喜
• Other Authors: Jinn P. Chu
• Format: Others
• Language: zh-TW
• Published: 1996
• Online Access: http://ndltd.ncl.edu.tw/handle/48673902064106594192

碩士 === 國立海洋大學 === 材料工程研究所 === 84 === Since copper and carbon are immiscible, Cu-C pseudoalloy is likely to be a noble material for the high-temperature applications. In this study, Cu-C pseudoalloys were prepared by mechanical alloying (MA) and R.F. magnetron sputter deposition techniques. With careful control of processing conditions, the carbon concentrations in Cu-C alloys obtained were up to 59.4 and 16.3 at.% by MA and sputter deposition, respectively. Lattice expansion of Cu evidenced by XRD indicated that interstitial carbon atoms were in solid solution with copper. After annealing, a massive phase separation occurred (heated to 400。) for as-milled Cu-C powder, while the precipitation of carbon-rich nanocrystalline phase appeared in Cu-C films (heated to 550。). Thermal analysis results showing exothermic transitions in both cases confirmed the in situ hot stage TEM observations. Ultra-microhardness results showed hardnesses increased with carbon contents for both Cu-C powders and films. Electrical resistivity measurement revealed the resistivities of Cu-C films decreased with carbon contents for the low carbon concentrations (<11.3%C) whereas it showed a different trend above 11.3%C, suggesting the improvement of film microstructure.