Time：2023.06.20Browse：1
High purity flake graphite has good high-temperature resistance, conductivity, thermal conductivity, lubricity, and chemical stability. Graphite powder manufacturers are widely used in fields such as metallurgy, machinery, environmental protection, chemical industry, fire protection, electronics, medicine, military industry, aerospace, etc. It plays an increasingly important role in the national economy and is an indispensable non-metallic raw material for modern industrial and high-tech development. Trace impurities have a significant impact on the performance of graphite products. The higher the carbon content of high-purity flake graphite, the better its performance as a functional material.
In order to analyze trace impurities in high-purity flake graphite, the sample is usually ashed or wet digested to remove carbon, the ash is dissolved in acid, and the impurity content in the solution is then determined. The ashing method does not require the use of ultrapure acids to dissolve ash, avoiding the danger of introducing the elements to be tested, and is therefore widely used. The detection of the ash content in high-purity flake graphite is very difficult because it requires high-temperature combustion to enrich the ash. At high temperatures, the ash will stick to the sample boat, making it difficult to separate, resulting in the inability to accurately determine the composition and content of impurities.
The existing methods all utilize the characteristic of platinum crucibles that do not react with acids. Use a platinum crucible to burn high-purity flake graphite to enrich ash, and then directly dissolve the sample in an acid heated crucible. The impurity content in flake graphite can be calculated by measuring the composition in the solution. However, this method has certain limitations because high-purity flake graphite contains a large amount of carbon, which can make platinum crucibles brittle at high temperatures and easily lead to fracture. Moreover, the detection cost is high, making it difficult to widely apply. Due to the inability of traditional methods to detect impurities in high-purity flake graphite, it is necessary to improve the detection method.
Flake graphite is widely used in advanced refractory materials and coatings in the metallurgical industry. Such as magnesia carbon bricks, crucibles, etc. Stabilizing agent for industrial explosives, desulfurization accelerator for smelting industry, pencil lead for light industry, carbon brush for electrical industry, electrode for battery industry, catalyst for fertilizer industry, etc. After deep processing, graphite flakes can produce graphite lotion, which can be used as lubricant, release agent, wire drawing agent, conductive coating, etc. Expanded graphite can also be produced as a raw material for flexible graphite products, such as flexible graphite seals and flexible graphite composite products.
As a functional filler for coatings, flake graphite is mainly used for anti-corrosion coatings, fireproof coatings, and conductive coatings. As an anti-corrosion material, it is a rust resistant primer made of carbon black, talc powder, and oil, which has good chemical resistance and solvent corrosion resistance. If chemical pigments such as zinc yellow are added to the formula, the rust prevention effect will be better.
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2023-03-08
