NEW PROCESSING FOR PREPARING Al2O3/Cu COMPOSITE BY IN SITU REACTION
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摘要: 采用一种新型工艺制备了Al2O3/Cu复合材料。高能球磨制备亚稳态的Cu-0.8 wt% Al合金粉,再将Cu2O粉与其一起进行高能球磨,然后将复合粉末压坯在真空炉中同时进行氧化和烧结。该工艺省略了还原剩余Cu2O的环节,氧化和烧结时间仅为1 h。生成的Al2O3的粒径约250nm,颗粒间距约500 nm,均匀弥散分布;该材料冷加工后性能接近SCM制品性能。该配比的Al2O3/Cu复合材料的热稳定性良好,在800℃下循环冷淬20次无裂纹;软化温度为700℃。
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关键词:
- 原位反应 /
- Al2O3/Cu复合材料 /
- 高能球磨
Abstract: A Cu-Al2O3(1.5wt% or so) composite was successfully prepared by using a new approach, which includes high energy milling of Cu and Al powder to produce Cu-Al alloy powder, high energy milling of the Cu-Al alloy powder together with Cu2O powder, and preparing Al2O3/Cu composite through conducting oxidation and sintering synchronously in vacuum. The peculiarities of this approach are that the reduction of superfluous Cu2O is left out, and the period of reacting and sintering is only 1 hour. It was observed that the Al2O3 particles uniformly dispersed in the copper matrix with an average size of 250nm in diameter and particles space between 500 nm. The properties of Al2O3/Cu composite are close to those of SCM products after cold working. The Al2O3/Cu composite possesses excellent thermal stability since there are no cracks observed after exposing to 800℃ and then cold quenching, which is cycled 20 times. The intenerating temperature of Al2O3/Cu composite is about 700℃.-
Key words:
- in situ reaction /
- Al2O3/Cu composite /
- high energy milling
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