Densification process for preparing high-volume-fraction SiCp/Al composite material
A composite material and densification technology, applied in the field of powder metallurgy, can solve the problems of poor interface bonding, poor density, and difficult to control, and achieve the effect of avoiding poor interface bonding and excellent thermal conductivity.
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[0024] Examples 1-12 and Comparative Examples 1-6
[0025] Raw material aluminum powder with an average particle size of 8 μm and SiC powder (with an average particle size of 100 μm and 10 μm mixed in a ratio of 10:4) were respectively dried in a vacuum drying furnace at 110° C. for 2 hours for drying treatment. The SiC powder and the aluminum powder were added to the ball mill according to a certain volume percentage for mixing, the rotating speed was 280r / min, and the mixing time was 2 hours. The mixed powder after ball milling is put into a mold for cold pressing, and the cold compact is put into a vacuum hot press for hot pressing sintering. During the period of reaching about 300°C, a pressure of 15MPa was applied, during the period of pressurization from about 300°C to the hot-pressing temperature, the pressure was gradually increased from 15MPa to 60MPa, and the time for heating from ambient temperature to hot-pressing temperature or from the start of pressurization to ...
Example Embodiment
[0030] Examples 13-24
[0031] The operation was carried out as in the above-mentioned example, and the material composition, hot pressing pressure, and hot pressing temperature are shown in Table 3.
[0032] table 3
[0033]
[0034]
[0035] 60% SiC from Table 3 p It can be seen from the change data of the density of / Al composites: when the forming pressure is 50MPa, the density of 60%SiCp / Al composites reaches 98.93%, which is the highest density compared with other processes under hot pressing pressure. 70%SiC p The content of silicon carbide particles in the / Al composite is too high, so the applied thermal pressure mainly acts on the silicon carbide particles. As the hot pressing pressure of the material continues to increase, the greater the force acting on the reinforcing particles, more silicon carbide particles are crushed, and the material density decreases, so the best hot pressing pressure at 620 °C is 40MPa.
Example Embodiment
[0036] Examples 25-30
[0037] Operate the same as the above-mentioned embodiment, but set the hot pressing process conditions of 620°C and 50MPa, and use different volume fractions of SiC p / Al composite, the results are shown in Table 4.
[0038] Table 4
[0039]
[0040] As shown in Table 4, SiC with different volume fractions of SiC prepared under the same hot pressing process is given p / Al composite density data. It can be seen that with the increase of the content of silicon carbide particles, the density of the composite material decreases from 99.69% to 94.14%, showing a gradual downward trend. Since the strength and hardness of the silicon carbide particles are much higher than those of the pure aluminum matrix, with the increase of the silicon carbide content, more external loads act on the reinforcement particles, which changes the overall mechanical properties of the composite material. The hardness of the composite material increases linearly with the incr...
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