Effect of Al Content on the Properties and Microstructure of Al2O3–Cu Composite Prepared by Internal Oxidation
Effect of Al Content on the Properties and Microstructure of Al2O3–Cu Composite Prepared by Internal Oxidation
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DOI：
10.1177/0021998304043752
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发表时间：
2004-09
影响因子：
2.9
通讯作者：
Liang Shuhua;Fang Liang;X. Lei;Fa N Zhikang
中科院分区：
文献类型：
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作者：
Liang Shuhua;Fang Liang;X. Lei;Fa N Zhikang
采用高能球磨与内氧化相结合的方法制备了Al 2 O3-Cu复合材料。研究了Al含量对复合材料硬度和导电性的影响。对制备Al_2O_3-Cu复合材料过程中Al的内氧化放热效应进行了计算和讨论。结果表明，Al含量对Al 2 O3-Cu复合材料的组织和性能有很大影响。当Al含量小于0.8wt%、内氧化温度为1223 K时，复合材料的性能随Al含量的增加而提高。当Al含量超过0.8wt%时，复合材料的性能反而下降。这种情况的主要原因是由于随着Al含量的增加，放热效应更大，导致一部分Cu熔化。在试样制备过程中，放热效应对氧化和烧结温度的影响占主导地位。在这种情况下，加热速率和内氧化温度的选择应随Al含量而变化。
Combining high-energy milling with internal oxidation, Al2O3–Cu composite was prepared. The effect of Al content on hardness and electrical conductivity of the composite material was studied. The exothermic effect of Al resulting from internal oxidation during fabricating Al2O3–Cu composite was also calculated and discussed. The results show that Al content has a great effect on the properties and microstructure of the Al2O3–Cu composite. When Al content is less than 0.8wt% and the internal oxidation temperature is at 1223 K, the properties of the composite are improved with the increase in Al content. In contrary, the properties of the composite will decrease while the Al content is more than 0.8 wt%. The main reason for this case is the melting of a part of Cu resulting from the greater exothermic effect with increasing Al content. The influence of exothermic effect on the oxidation and sintering temperature is predominant for the specimen preparing procedure. In this context, the choices of heating rate and the internal oxidation temperature should be varied with Al content.