What are the outstanding performances of silicon carbide bushings prepared by reaction sintering in terms of hardness?
Publish Time: 2024-12-16
The silicon carbide bushings prepared by reaction sintering show extremely outstanding characteristics in terms of hardness, making them stand out in many industrial application fields.Silicon carbide itself has a very high hardness, and the reaction sintering process further optimizes its hardness performance. On the Mohs hardness scale, the hardness of silicon carbide is second only to a few superhard materials such as diamond. The hardness value of reaction sintering silicon carbide bushings can usually reach 2500-3000 kgf/mm2, which is several times or even more than ten times the hardness advantage of traditional metal bushing materials, such as steel bushings (hardness is generally 200-800 kgf/mm2).This high hardness plays a key role in wear-resistant application scenarios. Taking the sleeve in mechanical processing as an example, strong friction and wear will occur between the high-speed rotating shaft and the sleeve. Reaction sintering silicon carbide bushings can effectively resist the scratching and erosion of the sleeve surface by cutting fluid, metal debris, etc. due to their high hardness. During long-term use, their wear rate is extremely low, and their service life can be extended several times compared to metal bushings. In the transmission parts of mining machinery, such as the bearing bushings of crushers, they need to withstand huge impact and friction. The high hardness of reaction sintering silicon carbide bushings enables them to maintain good shape and dimensional accuracy under harsh working conditions, and will not be easily worn and deformed by hard objects such as ore particles, thereby ensuring the stable operation of the equipment, reducing the equipment downtime and maintenance time caused by bushing wear, and greatly improving production efficiency.The reaction sintering process enhances the hardness of silicon carbide bushings through the formation of special microstructures. During the reaction sintering process, silicon and carbon react to form silicon carbide, and the remaining silicon fills the pores between silicon carbide particles, forming a dense and high-strength composite structure. This structure makes the silicon carbide bushing show extremely high hardness on a macro scale, and when subjected to external force, it can evenly disperse stress, further improving its wear resistance.In addition, the high hardness of the reaction sintering silicon carbide bushing can still remain stable in a high temperature environment. In some high-temperature application scenarios, such as the guide roller bushing in steel smelting equipment, when the temperature rises, the hardness of the metal bushing will drop significantly, while the hardness of the reaction sintering silicon carbide bushing is almost unaffected, and it can continue to effectively play its wear-resistant and supporting role, providing a solid guarantee for the reliable operation of high-temperature industrial equipment, and fully demonstrating its unique advantages and excellent performance in hardness.
