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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.

Active Publication Date: 2017-12-26
HUNAN GOLDHORSE ALUMINUM IND
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing problems are mainly: (1) the wettability between silicon carbide particles and Al matrix is ​​poor, resulting in poor interface bonding, and the structure compactness and thermal conductivity of the composite material are affected to a certain extent; (2) Al Interfacial reaction with silicon carbide particles is easy to generate Al 4 C 3 The brittle phase reduces the interfacial bonding strength of the composite material, and at the same time increases the interfacial thermal resistance, making the thermal conductivity of the composite material lower; or adding alloys such as Mg and Si to aluminum in order to reduce the influence of interface reactions, or it may be due to Incomplete impregnation of molten aluminum leads to voids inside the material and poor density; (3) The preparation process is complex, difficult to control, and high in cost

Method used

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  • Densification process for preparing high-volume-fraction SiCp/Al composite material
  • Densification process for preparing high-volume-fraction SiCp/Al composite material
  • Densification process for preparing high-volume-fraction SiCp/Al composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-12 and comparative example 1-6

[0025] Raw aluminum powder and SiC 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 dried in a vacuum drying oven at 110 ° C for 2 hours. The SiC powder and the aluminum powder are added into a ball mill according to a certain volume percentage for mixing at a speed of 280 r / min, and the mixing time is 2 hours. The mixed powder mixed by ball mill is put into the mold for cold pressing and forming, and the cold compact is put into the vacuum hot press for hot pressing and sintering, wherein the pressure is applied during the heating process of hot pressing and sintering, from the beginning of heating to During the period of reaching about 300°C, apply a pressure of 15MPa. During the period of pressurization from about 300°C to the hot-pressing temperature, the pressure gradually increases from 15MPa to 60MPa. The time for pressurizing to the hot-pressing pressure is 10 minutes; the time...

Embodiment 13-24

[0031] Operated as in the above example, 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 The change data of the density of the / Al composite material can be seen: when the forming pressure is 50 MPa, the density of the 60% SiCp / Al composite material reaches 98.93%, which is the highest compared with other processes under hot pressing pressure. 70%SiC p The content of silicon carbide particles in the / Al composite material 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, resulting in more silicon carbide particles being crushed, the material density decreases, so the better hot pressing pressure at 620°C is 40MPa.

Embodiment 25-30

[0037] Operate as in the above example, but set the hot pressing process conditions at 620°C and 50MPa, and use different volume fractions of SiC p / Al composite material, the results are shown in Table 4.

[0038] Table 4

[0039]

[0040] As shown in Table 4, SiC with different SiC volume fractions prepared under the same hot pressing process is given. p / Al composite density data. It can be seen that as the content of silicon carbide particles increases, the density of the composite material decreases from 99.69% to 94.14%, showing a gradual downward trend. Since the strength and hardness of silicon carbide particles are much higher than that of pure aluminum matrix, as the content of silicon carbide increases, more external loads act on the reinforcement particles, which changes the overall mechanical properties of the composite material, especially the The hardness of the composite material increases linearly as a function of the silicon carbide particle content.

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Abstract

The invention relates to a densification process for preparing a high-volume-fraction SiCp / Al composite material. The process comprises the following steps: SiC powder and aluminum powder are added into a ball mill to be mixed according to a volume ratio of 50-80% to 20-50%, preferentially a volume ratio of 50-60% to 40-50%, the mixed powder subjected to ball milling and mixing is put into a mold to be subjected to cold press molding, a cold pressed blank is put into a vacuum hot press for hot-pressing sintering, the pressure is applied in the heating process of the hot-pressing sintering, the temperature is increased to 560-635 DEG C, and at the same time, the pressure is kept under the hot-pressure of 28-65 MPa, the percentage is calculated according to a benchmark of the total volume of the SiC powder and the aluminum powder.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy, and relates to a densification process for preparing high-volume SiCp / Al composite materials. Background technique [0002] SiC p / Al composite material, as the most commonly used type of particle reinforced aluminum matrix composite material, is a composite material in which aluminum or aluminum alloy is used as the matrix continuous phase, and the material performance is strengthened by adding silicon carbide particle reinforcement phase. SiC p The properties of / Al composites depend on the size, content, shape, distribution and processing methods of the aluminum matrix and silicon carbide particles. Compared to other materials, SiC p / Al composite materials mainly have the following performance characteristics: (1) high specific strength, specific stiffness and low density; (2) good wear resistance; (3) low thermal expansion coefficient, good dimensional stability; (4) good Excel...

Claims

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Application Information

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IPC IPC(8): C22C1/05C22C29/06B22F3/14
CPCB22F3/14B22F2003/145C22C1/051C22C29/065
Inventor 刘海洋余先锋牛仕龙张辉
Owner HUNAN GOLDHORSE ALUMINUM IND
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