機械化學研磨合成氧化鋯/銅基複合材料及其性質

Mechanochemical Synthesis of ZrO2/Cu Composites and Their Properties

陳威良(Wei-liang Chen)

指導教授 ： 吳新明

大同大學/工程學院/材料工程學系所/碩士(2011年)

摘要

在本研究中，以機械化學合成技術製備氧化鋯強化銅基複合材料，銅基材料中氧化鋯目標含量分別為10、15、20、25及30體積百分比，氧化鋯與銅的複合粉末使用兩種不同製備方法球磨，將純銅、氧化銅及鋯粉於氬氣氣氛中以高能球磨機進行混合，再將球磨後之混合粉末以熱壓製備氧化鋯/銅複合材料。第一種製備方法為經由反應式xCu+2CuO+Zr → (x+2)Cu+ZrO2，直接反應生成銅基中所要的氧化鋯含量，此一製程稱為一次球磨製程；另一種製備方法稱為二次球磨製程，先將氧化銅粉與鋯粉以計量2比1莫耳進行球磨，反應式為2CuO+Zr → 2Cu+ZrO2，反應生成銅與氧化鋯後，再添加銅粉配置成所要的銅與氧化鋯比，再進行第二次的球磨混合。對於熱壓塊材進行微硬度及電性測試，並對球磨後粉末及熱壓塊材進行XRD、OM、SEM及EDS分析，此研究為探討複合塊材中的氧化鋯含量對於材料性質的影響。微觀結構分析顯示氧化鋯顆粒均勻分散在銅基中；複合塊材隨著氧化鋯含量增加，銅的晶粒尺寸傾向於減少；複合塊材隨著氧化鋯含量增加，導電性及相對密度會隨之減少；複合塊材隨著氧化鋯含量增加，微硬度則會隨之上升。由實驗結果可知，一次球磨製程相較於二次球磨製程有較好的導電性、相對密度及微硬度。

關鍵字

導電性 ； 機械化學合成 ； 氧化鋯 ； 氧化物強化銅基材料

並列摘要

In this study ZrO2-strengthening Cu composite materials were made by mechanochemical synthesis technique. The zirconia content in the copper matrix is targeted at 10, 15, 20, 25, and 30 vol.%, respectively. The ZrO2 and Cu composite powders were first prepared using high energy ball milling in argon atmosphere with mixtures of pure copper, copper oxide and zirconium powders via two processing routes. The processed powders were then subjected to hot pressing to produce bulk ZrO2/Cu composites. One processing route of the powder mixtures is through the reaction of xCu+2CuO+Zr → (x+2)Cu+ZrO2 with the reaction product in complying with the target ZrO2 content in Cu powder matrix. This processing route is hereafter called a single milling process. The other route is called double milling process by first milling through the reaction of 2CuO+Zr → 2Cu+ZrO2 to produce Cu and ZrO2 powders in stoichiometric 2 to 1 mole followed by adding proper Cu powder to the first milling reaction product and further milling to give the required Cu and ZrO2 content in the composite. The microhardness and electrical conductivity of the pressed bulk composite materials were measured. The processed powders and the bulk composites were analyzed by using X ray diffraction, optical microscopic observation, SEM observation together with energy dispersive spectroscopic (EDS) analysis. The effect of zirconia content on the properties of bulk composites were investigated in this study. The microscopic structure analysis shows that zirconia particles are dispersed uniformly in the copper matrix. With increase in the ZrO2 content, the Cu crystallite size shows a tendency to decrease. The measured electrical conductivity and relative density of the bulk composite are decreased with increase in ZrO2 content. However, the measured microhardness of the bulk composite is increased with increase in ZrO2 content. In summary, the bulk material properties of the produced composites in terms of electrical conductivity, relative density and microhardness are better for the single milling process than for the double milling process.

並列關鍵字

oxide strengthened Cu-based materials ； Mechanochemical synthesis ； zirconia ； electrical conductivity

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