Coated crucible refers to a crucible with a special chemical coating on the surface to improve its heat resistance, corrosion resistance and wear resistance. The following is a detailed introduction to coated crucibles:
- Types of coated crucibles
Graphite coated crucible: With graphite as the main component, the coating thickness is generally between 20μm and 70μm. It has excellent oxidation resistance, corrosion resistance and good thermal conductivity, and is suitable for various reactions at high temperatures, such as molten metal, molten glass and molten salt.
Ceramic coated crucible: With alumina, zirconia and other ceramic materials as the main components, the coating thickness is generally between 40μm and 150μm. It has excellent fire resistance, corrosion resistance and thermal conductivity, and can withstand chemical reactions at high temperatures, such as hydrogen corrosion, which quartz crucibles cannot withstand.
Stainless steel coated crucible: stainless steel is used as the base material, and the coating thickness is generally between 30μm and 50μm. It has excellent properties such as acid and alkali resistance, high temperature resistance, wear resistance and impact resistance, and is suitable for biomedicine, chemical industry and food industries.
- Characteristics of coated crucible
Improve performance: Coating technology can significantly improve the high temperature resistance, corrosion resistance and other properties of the crucible and extend its service life.
Widely used: Coated crucibles are widely used in smelting, precipitation, crystal growth and high temperature reaction. For example, crucibles used in industries such as steel smelting, aluminum smelting and glass production are often coated with graphite to improve their fire resistance and corrosion resistance. In the fields of nanomaterial preparation, biomedicine and chemical analysis, ceramic coated and stainless steel coated crucibles can ensure the purity and repeatability of the reaction.
- Technical principle of coated crucible
Coating technology is a process of applying a thin film or coating on the surface of the crucible to achieve the purpose of rust prevention, corrosion resistance enhancement, and appearance beautification. In crucible manufacturing, surface coating technology improves the overall performance of the crucible by changing the physical and chemical properties of the crucible surface. For example, silicon carbide coating modifies the surface of graphite crucible to improve its high temperature resistance and corrosion resistance; tantalum coating can effectively prevent graphite from oxidizing at high temperatures and extend its service life.
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