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Graphite Crucibles Antioxidant Coating Technology

QINGDAO YOSION LABTECH CO., LTD. | Updated: Nov 03, 2017

Graphite crucibles anti-oxidation coatings, water-based inorganic paint, high temperature, normal temperature without any volatile substances. ZS-1021 Weihua high temperature sealing paint coating itself acid and alkali, also Harmony quenching medium and any reaction can effectively maintain the chemical reaction of graphite crucibles under high temperature, which can effectively prevent the graphite crucibles at high temperature oxidation rate of 95% or more.

Graphite crucibles, due to its high temperature resistance, small coefficient of thermal expansion, thermal shock resistance has a certain anti-strain properties of acid, alkaline solution, strong corrosion resistance, with excellent chemical corrosion resistance stability, so in metallurgy, casting, machinery , Chemical industry and other industrial sectors, are widely used in smelting of alloy tool steel and smelting of non-ferrous metals and their alloys, and has good technical and economic results.

Graphite crucibles is mainly made of graphite, which is an allotrope of carbon, each carbon atom is linked to the periphery of the other three carbon atoms (arranged in a honeycomb hexagonal) to covalent Bond to form a covalent molecule. Graphite crucibles most of the carbon, part of the air, so that the graphite crucibles at high temperatures prone to oxidation, relaxation, shedding and other phenomena. A temporary study by Beijing Zhisheng Weihua Antioxidant Coatings researchers found that the graphite material started to oxidize at about 500 ℃. As the temperature of the graphite crucible increased, the oxidation rate showed a geometric increase and oxidation intensified.

Graphite materials at high temperatures include three types of graphite electrodes, graphite molds and graphite crucibles. Graphite in these three materials is susceptible to oxidation and combustion at elevated temperatures, resulting in an increase in the porosity and porosity Loose, affecting the service life. Take ladle conventional baking as an example, carbon-containing (graphite) refractory materials generally appear after the baking appearance of more than 15mm of decarburization loose layer, decarburization layer quickly eroded away after Shengang. At this time most of the graphite crucibles ZS-1021 high temperature sealing paint, this coating high temperature, using Zhi Sheng Wei Hua special high temperature solution, temperature can reach 1800 ℃, you can fire open flame for a long time, coating materials using nano-scale Structure, compactness, effectively prevent the proliferation of oxygen at high temperatures, the hardness can reach 7-8H hardness higher than the hardness of the metal. Zhisheng Weihua ZS-1021 closed high temperature paint coating brushing in the graphite crucibles to form a dense coating, with a strong anti-rust anti-corrosion, high temperature oxidation resistance, anti-discoloration, wear and other characteristics. High-temperature closed paint brushing on the kiln, graphite, metal, etc., to prevent the oxidation rate of high temperature can reach more than 80%, graphite crucible information energy-saving utilization rate can reach 95%.

In the graphite crucible heated at very high temperature, the graphite electrode used in the high temperature oxidation environment will locally undergo sublimation and oxidation due to the high-temperature electric arc, causing the graphite crucible to be consumed from time to time, even rupturing and breaking. The graphite crucible loss rate will reach 40-60% Zhisheng Weihua years of research and production of ZS high temperature sealing paint is mainly used for high temperature oxidation of graphite electrodes, graphite crucibles, graphite parts, slow oxidation rate, increase data intensity , Improve service life. Effectively lower the graphite electrode rupture, damage, loss probability.

Graphite crucible after anti-oxidation coating impregnation brushing, the high temperature ZS-1011 graphite transition coating liquid can penetrate into the pores of the graphite crucible, emptying graphite crucible residual air, graphite crucible pores and graphite crucible appearance of a layer of resistance Oxidation maintenance film. It is this layer of membrane can be effectively isolated from the air in direct contact with the graphite crucible and oxidation reaction, the Chi Sheng Weihua anti-oxidation coating impregnated graphite crucible will not crack in the high temperature changes, fall off, which can effectively delay the graphite Crucible oxidation, to extend the life of graphite crucible.

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