Carbon nanotube and Al3Sc synergistically reinforced aluminum alloy and preparation method thereof
A technology of carbon nanotubes and single-wall carbon nanotubes, which is applied in the field of aluminum alloy composite materials, can solve problems such as difficult control of comprehensive performance and complicated preparation process, and achieve excellent comprehensive performance and increase strength
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[0028] The present invention also provides a preparation method of single-walled carbon nanotube / co-reinforced aluminum alloy composite material: powder metallurgy method and process, powder metallurgy includes the following steps:
[0029] The raw materials of the following components are mixed to obtain a mixed powder: single-walled carbon nanotubes (content: 0.05-0.15 wt%), Al 3 Sc (0.05% to 0.7%), aluminum matrix composition: 6061 aluminum alloy (the remainder).
[0030] b) sintering the mixed powder by vacuum hot pressing, the sintering temperature is 500℃~550℃, and the pressure is 10~30MPa;
[0031] Step a) is the process of mixing the raw materials. In order to fully mix the various raw materials, the above-mentioned mixing time is preferably 60min-180min. The mixing method of the present invention mainly adopts vacuum dry grinding. As a preferred way, the diameter of the single-walled carbon nanotubes is 1-20 nanometers, and the length is 0.5-30 micrometers; the part...
Embodiment 1
[0035] (1) Single-walled carbon nanotubes are 0.2 wt% (ultrasonic dispersion for 1 hour), based on Al 3 Sc (0.1 wt %), aluminum matrix composition: 6061 aluminum alloy (99.9 wt %,), the average particle size of the powder is 9 microns. Vacuum dry grinding for 180 minutes to obtain mixed powder;
[0036] (2) applying vacuum hot pressing sintering (temperature 550°C, pressure 10MPa) to the mixed powder obtained in step (1) to obtain a green body;
[0037] The properties of the synergistically reinforced aluminum alloy composites prepared according to the above method were tested, the results are shown in Table 1, and the structure is shown in the attached figure 1 , the fracture topography is shown in the attached figure 2 .
Embodiment 2
[0039](1) Single-walled carbon nanotubes are 0.2 wt% (ultrasonic dispersion for 1 hour), based on Al 3 Sc (0.2wt%), aluminum matrix composition: 6061 aluminum alloy (99.6wt%,), powder average particle size 9 microns. Vacuum dry grinding for 180 minutes to obtain mixed powder;
[0040] (2) applying vacuum hot pressing sintering (temperature 550°C, pressure 10MPa) to the mixed powder obtained in step (1) to obtain a green body;
[0041] The properties of the synergistically reinforced aluminum alloy composites prepared according to the above method were tested, the results are shown in Table 1, and the structure is shown in the attached image 3 , the fracture topography is shown in the attached Figure 4 .
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