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Research And Analysis On Antioxidant Coatings Of Graphite Crucibles

QINGDAO YOSION LABTECH CO., LTD. | Updated: Jul 18, 2017

Graphite Crucibles, because of its high temperature resistance, small thermal expansion coefficient, against thermal shock has a certain resistance to strain performance, acid, alkaline solution of strong corrosion resistance, with excellent chemical corrosion stability, so in the metallurgical, foundry, mechanical, chemical and other industrial sectors, is widely used in alloy tool steel smelting and non-ferrous metals and alloys smelting, and has a better technical and economic results.

Graphite Crucibles is mainly made of graphite, which is a allotrope of carbon, each of which is connected with three other carbon atoms (arranged in a honeycomb-shaped plurality of hexagonal) to covalent bonding. Graphite Crucibles is mostly carbon, part of the air, so that graphite crucibles at high temperature prone to oxidation, Shu, shedding and other phenomena.

The graphite materials synthesized at high temperature include graphite electrode, graphite mould and graphite crucibles three, the graphite in three kinds of materials at high temperature, the graphite is easily oxidized and combustion reaction, resulting in the increase of the porosity of the surface layer of the material and the loose structure, which affects the service life. For example, the normal baking of ladle, carbon (graphite) refractory is produced after baking on the general surface of 15mm above the decarburization layer, decarbonization layer in the steel soon after the erosion. At this time the majority of graphite crucibles using ZS-1021 high-temperature sealing coating, this coating temperature high, the use of Shengwai special high-temperature solution, temperature can reach 1800 ℃, can be long time to withstand open fire barbecue, coating materials using nano-scale flake structure, good compactness, effective to prevent oxygen at high temperature diffusion, hardness can reach 7-8h, hardness higher than the hardness of metal. Shengwai ZS-1021 high-temperature Sealing paint coating on the graphite crucibles to form a dense coating, with strong anti-rust anti-corrosion, High-temperature anti-oxidation, anti-discoloration, wear-resistant characteristics. High temperature sealing coating in kiln, graphite, metal, etc., to prevent high temperature oxidation rate can reach more than 80%, graphite crucibles material energy-saving efficiency can reach more than 95%.

However, in the high temperature induction heating graphite crucibles, the graphite electrode used in high-temperature oxidation environment can be partially sublimated by high temperature arc, which will cause the continuous consumption of graphite crucibles and even break and breakage. The loss rate of graphite crucibles will reach $number. The ZS High-temperature sealing coating produced by Zhi Shengwai for many years is mainly used in the oxidation protection of graphite electrode, graphite crucibles and graphite workpiece in high-temperature environment, delaying oxidation speed, increasing material strength and increasing service life. The probability of rupture, breakage and loss of graphite electrode is lower.

After impregnating and brushing the graphite crucibles, the high-temperature ZS-1011 graphite transition coating liquid can penetrate into the pores of the graphite crucibles, emptying the remaining air in the graphite crucibles, and forming an antioxidant protective film on the surface of the graphite crucibles. It is this layer of protective film can effectively isolate the air directly and graphite crucibles contact with the oxidation reaction, through the Shengwai antioxidant paint impregnation treatment of graphite crucibles, will not be in the high temperature change cracking, shedding, thus effectively delaying the oxidation of graphite crucibles, prolong the service life of graphite crucibles.

Graphite Crucibles Antioxidant coatings, water-based inorganic Environmental Protection coatings, high-temperature, room temperature without any volatile substances produced. ZS-1021 Weihua high-temperature Sealing coating itself acid and alkali resistance, also do not react with quenching medium, can effectively protect the graphite crucibles at high temperature chemical reaction, can effectively prevent graphite crucibles at high temperature oxidation rate of more than 95%.

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