Preparation method of nano graphene oxide in-situ reinforced copper-chromium electrical contact material
An electrical contact material, in-situ strengthening technology, applied in chemical instruments and methods, contacts, circuits, etc., can solve the problems of poor affinity and interface binding force, low degree of oxidation, poor comprehensive performance, etc., and achieve tensile strength. and the effect of increased hardness, high degree of oxidation, and improved performance
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[0035]A method for preparing nano-graphene oxide in-situ strengthened copper-chromium electrical contact material. The electrical contact material is prepared by modified Hummers method to prepare graphene oxide, and then the metal mixed powder is mixed with the graphene oxide suspension after ultrasonic dispersion , It is made by vacuum hot pressing sintering after freeze drying. The preparation process specifically includes the following steps:
[0036]Step 1: Preparation of graphene oxide nanosheets
[0037]①Weigh high-purity graphite powder, concentrated sulfuric acid, sodium nitrate and potassium permanganate according to the dosage ratio of 1-1.5g: 25-30ml: 0.5-1g: 6-9g for use;
[0038]②Put the concentrated sulfuric acid, sodium nitrate and graphite weighed in step ① into the three-necked flask in turn. Under constant stirring, keep the temperature of the reaction system at 0-5°C for the first stage of reaction for 30-60min. At this stage, the graphite edge Gradually be oxidized; then...
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[0054]Example 1
[0055]A 0.1GO / Cu30Cr electrical contact material with a size of Φ50 mm×15 mm and doped with 0.1% self-made graphene oxide was prepared.
[0056]The specific preparation method is:
[0057]Step 1: Preparation of graphene oxide nanosheets
[0058]①Weigh high-purity graphite powder, concentrated sulfuric acid, sodium nitrate and potassium permanganate according to the dosage ratio of 1g:25ml:0.5g:6g, and set aside;
[0059]②Sequentially add the concentrated sulfuric acid, sodium nitrate and graphite weighed in step ① into the three-necked flask. Under constant stirring, keep the temperature of the reaction system at 3°C for the first stage of reaction for 30 minutes, during which the edge of graphite is gradually oxidized; Then, divide the potassium permanganate weighed in step ① into three parts, add one part every 10 minutes, and keep the temperature of the reaction system at 20°C for 2 hours under continuous stirring conditions. At this stage, the oxidation ability is enhanced ...
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[0074]Example 2
[0075]The 0.3GO / Cu30Cr electrical contact material with a size of Φ50 mm×15 mm and 0.3% graphene oxide doped was prepared.
[0076]The specific preparation method is:
[0077]Step 1: Preparation of graphene oxide nanosheets
[0078]①Weigh high-purity graphite powder, concentrated sulfuric acid, sodium nitrate and potassium permanganate according to the dosage ratio of 1.5g: 30ml: 0.8g: 7g, and set aside;
[0079]②Sequentially add the concentrated sulfuric acid, sodium nitrate and graphite weighed in step ① into a three-necked flask. Under constant stirring, keep the temperature of the reaction system at 0°C for the first stage of reaction for 50 minutes, during which the edge of graphite is gradually oxidized; Then, divide the potassium permanganate weighed in step ① into three parts, add one part every 12 minutes, and keep the temperature of the reaction system at 20°C under continuous stirring for 1.5 hours. At this stage, the oxidation capacity After that, the interval between...
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