Chromium oxide and chromium dispersion-strengthened copper-base composite material and its preparing method
A technology for dispersion strengthening of copper and composite materials, applied in the field of metal matrix composite materials, can solve problems such as the influence of Al on the electrical conductivity of materials, low solid solubility, etc., and achieve the effects of low cost, easy control and simple process
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[0026] Compared with the internal oxidation method, the preparation method of chromium oxide and chromium dispersion-strengthened copper-based composite material of the present invention has simple process, convenient control and low cost. As shown in the accompanying drawings, the method comprises the following steps:
[0027] a. Preparation of copper-chromium pre-alloyed powder
[0028] Put copper powder with a mass percentage of 97% to 99.5% and chromium powder with a mass percentage of 0.5% to 3% into a high-energy ball mill for ball milling for 5 to 8 hours. No protective gas is required during the ball milling process. The ball to material ratio is 30 to 40:1. The speed of the ball mill is 200-400 rpm to make copper-chromium pre-alloyed powder;
[0029] b. Preparation of internal oxidation composite powder
[0030] Add cuprous oxide powder to the copper-chromium pre-alloyed powder prepared above, and ball mill it in a high-energy ball mill for 2 to 3 hours. The mass per...
Embodiment 1
[0040] 99.5g of copper powder and 0.5g of chromium powder were ball milled in a high-energy ball mill for 5 hours, the ball-to-material ratio was 40:1, and the ball mill speed was 200 rpm to make copper-chromium pre-alloyed powder; then add 0.75g of cuprous oxide powder and The copper-chromium pre-alloyed powders are ball milled together for 2 hours, the ball-to-material ratio is 40:1, and the ball mill speed is 200 rpm to make a composite powder; the ball-milled composite powder is cold-pressed to make a compact; then the compact is put into In the vacuum furnace, the temperature measuring thermocouple directly measures the surface temperature of the sample, and the vacuum is first evacuated to 1.0×10 -2 Pa, use a heating rate of 10°C / min to rise to 400, use a heating rate of 15°C / min to rise to 900°C, keep at this temperature for 3 hours, carry out sintering and internal oxidation, during this process, the temperature is controlled by the instrument The program is automatica...
Embodiment 2
[0042] 97g of copper powder and 3g of chromium powder were ball milled in a high-energy ball mill for 8 hours, the ball-to-material ratio was 30:1, and the ball mill speed was 400 rpm to make copper-chromium pre-alloyed powder; then add 4.5g of cuprous oxide powder and copper-chromium The pre-alloyed powder is ball milled together for 3 hours, the ball-to-material ratio is 30:1, and the speed of the ball mill is 400 rpm to make a composite powder; the composite powder after ball milling is cold-pressed to make a compact; then the compact is put into a vacuum furnace In the middle, the temperature measuring thermocouple directly measures the surface temperature of the sample, and first vacuumizes to 0.1×10 -2 Pa, use a heating rate of 5°C / min to rise to 400°C, use a heating rate of 20°C / min to rise to 1000°C, keep at this temperature for 1 hour, carry out sintering and internal oxidation, during this process, the temperature is controlled by The instrument program is automatica...
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