Analysis of Antioxidant Performance of Graphite Crucible

**Anti-Oxidation Performance Analysis of Graphite Crucibles** Graphite crucibles are widely used in industrial applications such as metallurgy, foundry, machinery, and chemical processing due to their excellent thermal resistance, low thermal expansion coefficient, and strong resistance to thermal shock. They also exhibit high corrosion resistance against both acidic and alkaline solutions, making them ideal for melting alloy tool steel, non-ferrous metals, and their alloys. Their outstanding performance contributes significantly to technical and economic efficiency in various industries. These crucibles are primarily made from graphite, an allotrope of carbon. The structure consists of hexagonal layers where each carbon atom is covalently bonded to three others, forming a stable lattice. However, at high temperatures, graphite can be prone to oxidation, leading to structural degradation, loosening, and shedding. This makes the anti-oxidation protection of graphite crucibles crucial for extending their service life. In high-temperature environments, materials like graphite electrodes, molds, and crucibles are susceptible to oxidative combustion. This results in increased porosity and surface layer loosening, which reduces their durability. For example, during conventional ladle baking, a decarburized loose layer of 15 mm or more may form on carbon-containing refractory materials, leading to rapid erosion when filled with molten metal. To address this issue, **ZS-1021 High-Temperature Sealing Coating**, developed by Zhisheng Weihua, is commonly applied. This coating is designed to withstand extreme temperatures up to 1800°C and forms a dense, nano-scale protective layer on the surface of the graphite crucible. It offers exceptional resistance to oxidation, corrosion, and wear, with a hardness of 7–8H, surpassing that of many metals. By preventing oxygen diffusion, it significantly reduces oxidation rates, improving energy efficiency and extending the service life of the crucible. In high-temperature induction heating processes, graphite crucibles may suffer from sublimation and oxidation due to intense heat, leading to material loss and potential breakage. The ZS-1021 coating helps delay oxidation, enhance structural integrity, and reduce the risk of cracking or falling off. This results in a significant reduction in the loss rate, typically ranging between 40% and 60%. Additionally, the **ZS-1011 Graphite Transition Coating** is often used to impregnate and coat the crucible. This liquid penetrates the pores, expels residual air, and forms a protective antioxidant film on the surface. This barrier effectively prevents direct contact between the graphite and oxygen, slowing down oxidation and enhancing the crucible’s longevity. The **ZS-1021 Water-Based Inorganic Anti-Oxidation Coating** is environmentally friendly, producing no volatile substances at either high or normal temperatures. It is resistant to acids and alkalis, does not react with quenching media, and provides long-term protection against high-temperature oxidation. With over 95% effectiveness in reducing oxidation rates, it is a reliable solution for industrial applications. **Source**: Hebei Dacheng County Jindayu Factory **Editor**: Hardware Business Network Information Center **Website**: [http://news.chinawj.com.cn](http://news.chinawj.com.cn)

Serrated Lock Washer DIN 6798

zinc plated external serrated lock washers,electroplated zin external serrated lock washers, external serrated teeth lock washers, Stainless steel internal teeth washers

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