A kind of preparation method of silicon oil repair graphene reinforced aluminum matrix composite material

Abstract

The invention discloses a method for preparing a graphene-reinforced aluminum-based composite material repaired by silicone oil, and relates to a method for preparing a graphene-reinforced aluminum-based composite material. The purpose is to solve the problem that the defect content of graphene increases in the process of graphene-reinforced aluminum matrix composites and the difficulty of uniform dispersion of graphene in metal matrix composites. Weigh graphene, aluminum metal powder and silicone oil into a ball mill jar and ball mill and cold press to obtain a silicone oil-graphene / aluminum preform, heat the preform to obtain silicone oil to repair the graphene / aluminum preform, and finally prepare a composite material. The invention adopts thermal decomposition of the silicone oil grinding aid to generate active Si atoms to form a more stable silicon substitution structure, so that the performance of the material is improved. After the silicone oil is coated on the surface of the aluminum metal powder, the shear force in the impact is more likely to act on the surface of the aluminum metal powder, thereby facilitating the formation of the aluminum metal powder and reducing the agglomeration of graphene in the composite material. The invention is suitable for preparing graphene-reinforced aluminum-based composite materials.

Description

Technical field:

[0001] The invention relates to a preparation method of a graphene-reinforced aluminum-based composite material. Background technique:

[0002] Graphene has a tensile strength as high as 125GPa, an elastic modulus of 1TPa, and a thermal conductivity of 5000W / (m K), which is undoubtedly a nearly ideal reinforcement with superior comprehensive performance. According to the number of layers, graphene can be divided into single-layer graphene, double-layer graphene, few-layer graphene (3-10 layers) and multi-layer graphene (the number of layers is more than 10 layers, and the total thickness is less than 10nm). At present, the research on using graphene to improve the performance of resins and ceramics is the most active, while the research on using graphene to strengthen metal matrix, especially aluminum matrix composites is relatively less. The preparation methods are mainly solid-phase method and liquid-phase method. The solid-phase method includes various p...

Examples

specific Embodiment approach 1

[0033] Specific embodiment one: the preparation method of silicone oil repairing graphene reinforced aluminum matrix composite material in this embodiment is carried out according to the following steps: 1. Weighing

[0034] Take by weighing 0.5%~4% graphene, 0.5%~10% silicone oil and the aluminum metal powder of surplus as raw material by mass fraction; Described graphene is few-layer graphene, and average sheet diameter is 200nm~25 μ m, and average thickness is 1~30nm;

[0035] The aluminum metal powder is aluminum alloy;

[0036] 2. Graphene dispersion and prefabricated block forming

[0037] Put the graphene, silicone oil and aluminum metal powder weighed in step 1 into a ball milling tank, ball mill the obtained mixed powder at a speed of 150-400rpm for 0.5-4h, and put the mixed powder obtained after ball milling into a cold-pressing mold for cold Press to obtain silicone oil-graphene / aluminum prefabricated body;

[0038] 3. Prefabricated body insulation

[0039] Put th...

specific Embodiment approach 2

[0050] Embodiment 2: This embodiment is different from Embodiment 1 in that: the average particle size of the aluminum metal powder in Step 1 is 1-30 μm. Other steps and parameters are the same as those in the first embodiment.

specific Embodiment approach 3

[0051] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the silicone oil in Step 1 is polydimethylsilicone oil or polyphenyl silicone oil. Other steps and parameters are the same as those in Embodiment 1 or 2.

Technical field:

[0001] The invention relates to a preparation method of a graphene-reinforced aluminum-based composite material. Background technique:

[0002] Graphene has a tensile strength as high as 125GPa, an elastic modulus of 1TPa, and a thermal conductivity of 5000W / (m K), which is undoubtedly a nearly ideal reinforcement with superior comprehensive performance. According to the number of layers, graphene can be divided into single-layer graphene, double-layer graphene, few-layer graphene (3-10 layers) and multi-layer graphene (the number of layers is more than 10 layers, and the total thickness is less than 10nm). At present, the research on using graphene to improve the performance of resins and ceramics is the most active, while the research on using graphene to strengthen metal matrix, especially aluminum matrix composites is relatively less. The preparation methods are mainly solid-phase method and liquid-phase method. The solid-phase method includes various p...

Examples

specific Embodiment approach 1

[0033] Specific embodiment one: the preparation method of silicone oil repairing graphene reinforced aluminum matrix composite material in this embodiment is carried out according to the following steps: 1. Weighing

[0034] Take by weighing 0.5%~4% graphene, 0.5%~10% silicone oil and the aluminum metal powder of surplus as raw material by mass fraction; Described graphene is few-layer graphene, and average sheet diameter is 200nm~25 μ m, and average thickness is 1~30nm;

[0035] The aluminum metal powder is aluminum alloy;

[0036] 2. Graphene dispersion and prefabricated block forming

[0037] Put the graphene, silicone oil and aluminum metal powder weighed in step 1 into a ball milling tank, ball mill the obtained mixed powder at a speed of 150-400rpm for 0.5-4h, and put the mixed powder obtained after ball milling into a cold-pressing mold for cold Press to obtain silicone oil-graphene / aluminum prefabricated body;

[0038] 3. Prefabricated body insulation

[0039] Put th...

specific Embodiment approach 2

[0050] Embodiment 2: This embodiment is different from Embodiment 1 in that: the average particle size of the aluminum metal powder in Step 1 is 1-30 μm. Other steps and parameters are the same as those in the first embodiment.

specific Embodiment approach 3

[0051] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the silicone oil in Step 1 is polydimethylsilicone oil or polyphenyl silicone oil. Other steps and parameters are the same as those in Embodiment 1 or 2.

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