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Application Fields And Classification Of Copper Powder

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Update time : 2020-06-10 10:24:59

Copper powder: a powder formed by grinding copper into powder, widely used in powder metallurgy, electrical carbon products, electronic materials, metal coatings, chemical catalysts, filters, heat pipes and other electromechanical parts and electric aviation fields.

Classification of copper powder:

1. Atomized copper powder: It is a light rose red powder irregular powder, produced by the atomization method, widely used in diamond tools, powder metallurgy parts, chemical catalysts, carbon brushes, friction materials and welding electrodes.

2. Electrolytic copper powder: red copper powder and pure copper powder are rose-red dendritic powder, easily oxidized in moist air, can be melted in hot sulfuric acid, widely used in diamond tools, electrical carbon products, friction materials, conductive inks and Other powder metallurgy products.

3. Copper oxide powder: The particle size of the copper oxide powder means that the particle size is 100 mesh.

4. Bronze powder: refers to the dust in the shape of a cyan ball, Sn5-7% Zn5-7% Pb2-7% CU balance, widely used in powder metallurgy oil-bearing bearings and diamond tools.

5. Brass powder: irregular yellow powder, which is used in bearing materials, diamond products, powder metallurgy products.

6. Red copper powder: It is a kind of floating flake pigment, which is made of a certain proportion of copper powder, zinc powder and aluminium alloy powder by smelting, grinding and grading. The coarser the particles of copper powder, the stronger the hard feeling and the more flickering, but the hiding power is reduced. Conversely, if the particles are small, the weaker the metallic feel and the softer the colour, the better the hiding power. The copper and pink colour are pure and bright, and the metal feel is healthy. According to different application fields and the desired metal effect, it can be achieved by selecting different particle diameters and hue.

7. Atomized copper alloy powder: alloy powder made of copper as the primary raw material, combined with tin, lead, zinc and other alloy elements, smelted at high temperature, and then subjected to high-pressure atomization using water (gas) as the medium. According to the alloy, The powder composition is different, and the production process is different. There are many varieties and specifications. The product performance and use are different. It is widely used in many industries such as powder metallurgy, chemical industry, electrical alloy and so on.

8. Copper-gold powder: mainly uses copper and zinc as alloy elements, and has the traditional golden yellow colour of the Chinese nation. The particle size of the product is in the micron range, the average particle size d50 is 4~40 microns, and the microscopic appearance of the particles is scaly. Due to the use of advanced anti-oxidation technology, classification technology and surface modification technology in the process, copper-gold powder products have a series of advantages such as high hiding power, durable metal feel, excellent temperature resistance and weather resistance.

Emergency treatment: Isolate the leaked contaminated area and restrict access. Cut off the ignition source. It is recommended that emergency personnel wears dust masks (full-face masks) and general work clothes. Collect in a clean, dry, covered container with a clean shovel. If there is a big amount of leakage, collect and recycle.

Operation precautions: Operators must undergo specialised training and strictly abide by the operation regulations. It is recommended that operators are wearing self-priming filter dust masks and chemical safety glasses. Keep away from fire and heat; smoking is strictly prohibited in the workplace. Use explosion-proof ventilation systems and equipment. Avoid contact with oxidants, acids and halogens. Handle lightly during handling to prevent damage to the packaging. They are equipped with corresponding varieties and quantities of fire fighting equipment and leakage emergency treatment equipment. Empty containers may be harmful residues.

Precautions for storage: Store in a cold, ventilated warehouse. Keep away from fire and heat. It would be stored separately from oxidants, acids and halogens, and avoid mixed storage. It is equipped with the appropriate variety and quantity of fire equipment. The storage area would be equipped with suitable materials to contain the leakage.

Copper powder moisture detection method:

(1) Karl Fischer method

The principle of the Karl Fischer method is that the water sample is injected when the Karl Fischer reagent in the instrument's electrolytic cell reaches equilibrium. Water participates in the redox reaction of the iodine and sulfur dioxide. In the presence of pyridine and methanol, pyridinium iodate and methyl group are generated. Pyridine sulfate, the consumed iodine is produced at the anode electrolysis, so that the redox reaction continues until the water is entirely exhausted. According to Faraday's law of electrolysis, the iodine produced by electrolysis is proportional to the amount of electricity consumed during electrolysis. The Karl Fischer Moisture Analyzer can only measure to level 10-4 in the best condition; the consumables (reagents) are significant; the measurement time is too long.

(2) Oven method

According to the principle of loss on drying, the sample is dried in an oven, weighed, and converted to a moisture value. Use the oven method to detect a long time.

(3) Rapid moisture meter determination method

According to the principle of drying weightlessness, the sample is placed in the sample tray and heated to dry the moisture, the time is short, and the stability is strong.

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