A kind of graphene oxide reinforced magnesium-based composite material and preparation method thereof
A composite material and graphene technology, which is applied in the field of graphene oxide-reinforced magnesium-based composite materials and its preparation, can solve the problems of poor graphene dispersion and poor interface bonding between substrates, and achieve improved interface bonding, low cost, and environmental friendliness Effect
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Embodiment 1
[0030] For the composite material in this example, the matrix is AZ91 (particle size is 200-280 mesh, purity ≥99.9wt.%, Al: 9.07wt.%, Zn: 1.04wt.%, the rest is Mg), and the reinforcing phase is oxide Graphene (with a sheet diameter of 0.5-5 μm, a thickness of 0.8-1.2 nm, and a purity of ≥99.5 wt.%). Its preparation method comprises the following steps:
[0031] (1) Pretreatment of graphene oxide
[0032] Graphene oxide was placed in an argon (purity ≥ 99.5vol.%) atmosphere, heated to 800°C at a heating rate of 5°C / min, and then air-cooled.
[0033] (2) Pre-dispersion of graphene oxide
[0034] Weigh the pretreated graphene oxide obtained in 4000mg step (1), add it to 8000ml dehydrated alcohol and carry out ultrasonic treatment, the ultrasonic power is 400W, and the time is 90min to obtain the predispersion of graphene oxide; Stir mechanically, add 3996g of 200-350 mesh AZ91 powder during this process, the mechanical stirring rate is 600rpm, and the time is 30min, to obtai...
Embodiment 2
[0041] In the composite material in this example, the matrix is AZ91 (particle size is 200-280 mesh, purity ≥ 99.9wt.%, Al: 8.94wt.%, Zn: 1.17wt.%, the rest is Mg), and the reinforcing phase is oxide Graphene (with a sheet diameter of 1-10 μm, a thickness of 1-5 nm, and a purity of ≥99.0 wt.%). Its preparation method comprises the following steps:
[0042] (1) Pretreatment of graphene oxide
[0043] The graphene oxide was placed in a hydrogen-argon mixed gas atmosphere (the hydrogen content was 5 vol.%), and the temperature was raised to 600°C at a heating rate of 15°C / min, and then cooled with the furnace.
[0044] (2) Pre-dispersion of graphene oxide
[0045] Weigh the pretreated graphene oxide obtained in 80mg step (1), add it to 80ml of absolute ethanol and carry out ultrasonic treatment, the ultrasonic power is 500W, and the time is 70min to obtain the predispersion of graphene oxide; Mechanical stirring, add 39.92g of 200~350 order AZ91 powder (Al: 9.15wt.%, Zn: 0.5...
Embodiment 3
[0052]In the composite material in this embodiment, the matrix is pure magnesium (the particle size is 250-300 mesh, the purity is more than or equal to 99.5wt.%, and the rest is Mg), and the reinforcing phase is graphene oxide (the sheet diameter is 5-15 μm, and the thickness is 5 μm). ~10nm, purity ≥99.5wt.%). Its preparation method comprises the following steps:
[0053] (1) Pretreatment of graphene oxide
[0054] The graphene oxide was placed in a hydrogen-argon mixed gas atmosphere (the hydrogen content was 2.5 vol%), and the temperature was raised to 300°C at a heating rate of 10°C / min, and then cooled with the furnace.
[0055] (2) Pre-dispersion of graphene oxide
[0056] Weigh the pretreated graphene oxide obtained in 800mg step (1), add it to 8000ml dehydrated alcohol and carry out ultrasonic treatment, the ultrasonic power is 600W, and the time is 90min to obtain the predispersion of graphene oxide; Stir mechanically, add 3999.2g of 200-350 mesh pure magnesium ...
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