Method for preparing carbon nanotubes reinforced Al-Mg alloy composite materials
A technology of carbon nanotubes and composite materials, which is applied in the field of preparing carbon nanotube-reinforced Al-Mg alloy composite materials, which can solve the problem of poor wettability between carbon nanotubes and metal substrates, easy agglomeration of carbon nanotubes, and affecting the performance of composite materials, etc. problem, to achieve the effect of high strength, low density and improved performance
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Embodiment 1
[0011] Embodiment 1: get 100g average particle size and be divided into the aluminum-magnesium alloy powder of 20-35 μ m, wherein alloy composition and content are Al 94wt%, Mg 6wt%, 1.5g carbon nanotube and 3g polyvinyl alcohol, the purity of carbon nanotube is greater than 99.5%, the diameter is 20-60nm, and the length is 5-30μm. Mix the raw materials and add them to the high-energy ball mill. The ball-to-material ratio is 20:1. The total amount of mixed material accounts for 30-50% of the inner cavity volume of the ball mill, and the atmosphere of the ball mill is argon. Then, put the ball-milled powder into the discharge barrel, and put it into a glove box filled with argon for passivation for 5 hours. , the passivated composite powder was sintered by vacuum hot pressing, the sintering temperature was 420°C, and the vacuum degree was 5×10 -2 pa, the pressure is 50Mpa, and the holding time is 60min, and the finished carbon nanotube reinforced aluminum-magnesium alloy compos...
Embodiment 2
[0012] Example 2: Take 100g of aluminum-magnesium alloy powder with an average particle size of 35-50 μm, wherein the alloy composition and content are: Al: 96wt%, Mg: 4wt%, 2.5g carbon nanotubes, 2.5g n-heptane and 2.5g Zinc stearate, the purity of carbon nanotubes is greater than 99.5%, the diameter is 20-60nm, and the length is 5-30μm. Mix the raw materials and add them to the high-energy ball mill. The ball-to-material ratio is 25:1, and the rotation speed of the stirring shaft is 900 rpm / min, the ball milling time is 80min, steel balls and mixed materials account for 30-50% of the inner cavity volume of the ball mill, the ball milling atmosphere is argon, then put the ball milled powder into the discharge barrel, put it into the The passivation was carried out in a glove box for 7 hours, and the passivated composite powder was vacuum hot-pressed and sintered at a temperature of 440°C and a vacuum degree of 5×10 -2 pa, the pressure is 70Mpa, and the holding time is 90min,...
Embodiment 3
[0013] Example 3: Get 100g of aluminum-magnesium alloy powder with an average particle size of 50-100 μm, wherein the alloy composition and content are Al 97wt%, Mg 3wt%, 4g carbon nanotubes and 2g stearic acid, mix the raw materials and add them to a high-energy ball mill Inside, the ratio of ball to material is 30:1, the rotation speed of the stirring shaft is 1100 rpm, the ball milling time is 110min, and the ball milling atmosphere is argon. The passivation was carried out in a glove box for 10 hours, and the passivated composite powder was vacuum hot-pressed and sintered at a temperature of 450°C and a vacuum degree of 5×10 -2 pa, the pressure is 90Mpa, and the holding time is 120min, and the finished carbon nanotube-reinforced aluminum-magnesium alloy composite material is obtained. The density of the prepared composite material is: 97.7%, and the Brinell hardness is: 79.2HB.
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