Silicon carbide (SiC) mold sleeves, produced through isostatic pressing and high-temperature sintering processes, are essential components in high-precision manufacturing. These mold sleeves can be customized to include inner circular holes and vent holes, meeting specified tolerance requirements as per user designs. One of the primary applications of SiC mold sleeves is in hot-forming molds for pressing aspherical glass. Here are some key features and advantages of using silicon carbide mold sleeves:

Silicon carbide retains significant hardness and mechanical strength even at high temperatures, which is crucial for avoiding surface scratches during the forming process. This property ensures the longevity and reliability of the mold sleeves, making them suitable for demanding manufacturing environments.

The surface of SiC mold sleeves is free of pores, extremely smooth, and polished to an optical mirror finish. This quality prevents the adhesion of glass to the mold, enhancing the demolding performance. The excellent surface finish also contributes to the production of high-quality optical components.

Silicon carbide exhibits outstanding oxidation resistance at high temperatures, ensuring that the mold surface remains stable and does not react with optical glass. This stability is crucial for maintaining the quality of the glass components and ensuring consistent manufacturing results.

SiC mold sleeves have high thermal conductivity and low thermal expansion, which provide excellent thermal shock resistance. These properties enable the mold sleeves to withstand repeated heating and cooling cycles during the forming process, resulting in an extended service life.

The thermal expansion coefficient of silicon carbide is slightly lower than that of tungsten steel, which ensures good fitting with tungsten steel mold cores. This compatibility facilitates easier handling and replacement of molds, thereby extending the lifespan of the mold cores and significantly reducing production costs.

In conclusion, silicon carbide mold sleeves offer a combination of high hardness, superior surface quality, excellent oxidation resistance, and thermal properties that make them ideal for precision manufacturing applications. Their ability to maintain performance under high-temperature conditions and repeated thermal cycling ensures long-term durability and cost-effectiveness in producing high-quality optical components.