黃坤祥2006-07-252018-06-282006-07-252018-06-282000http://ntur.lib.ntu.edu.tw//handle/246246/12371本實驗利用活化燒結和液相燒結的方法，在鉬中添加1.5wt%Ni 和1wt%Ni-0.5wt%Cu，於1300℃左右的低溫燒結並達到緻密化後，測量其燒結後的性質，並與在高溫燒結的純鉬作比較，目的在探討鎳與銅的添加對鉬的燒結行為、機械性質與物理性質所造成的影響。實驗結果顯示：Mo-1.5wt%Ni 在1370℃及Mo-1wt%Ni-0.5wt%Cu 在1300℃的溫度燒結可分別達到97.6%和99%的密度，但卻會使燒結體變脆並降低導電、導熱等性質，經由歐傑 電子能譜儀和高解析度穿透式電子顯微鏡的分析，我們首次証明並發現活化燒結和液相燒結後機械性質和物理性質劣化的原因是由於燒結後鉬晶界間形成了一層質脆且導電度差的δ-NiMo 介金屬相所造成。The sintering temperature of molybdenum is usually greater than 1700℃. To decrease the high sintering temperature, both activated sintering and liquid phase sintering techniques have been used. The objective of this study was to investigate the effect of nickel and copper additions on the physical properties and the sintering behavior of thus sintered molybdenum. Results showed that Mo-1.5Ni and Mo-1Ni-0.5Cu when sintered at 1370℃ and 1300℃, 97.6% and 99% density were obtained, respectively. However, the conductivity and ductility became much lower compared with pure molybdenum sintered at 1750 ℃ . Auger spectra analyses and high resolution TEM images showed that a 2nm thick layer of δ- NiMo intermetallic compound formed at grain boundaries during sintering. This layer is believed to cause the deterioration of mechanical and physical properties of the activated and liquid phase sintered molybdenum.application/pdf487965 bytesapplication/pdfzh-TW國立臺灣大學材料科學與工程學研究所活化燒結液相燒結δ-NiMo 介金屬相Activated SinteringLiquid Phase Sinteringδ-NiMo Intermetallic Compoundreporthttp://ntur.lib.ntu.edu.tw/bitstream/246246/12371/1/892216E002021.pdf