Black Carborundum for silicon carbide products
Black carborundum is a raw material for producing silicon carbide grinding tools and silicon carbide ceramics. It features with high grinding ability, high hardness, high grinding efficiency, stable high-temperature performance, low thermal expansion rate, and strong corrosion resistance. As the main material of silicon carbide products, its quality directly affects the quality performance and user experience of the products.
So, how does high-quality black silicon carbide abrasive affect silicon carbide grinding wheels, silicon carbide sandpaper, and silicon carbide ceramics? Here are several main aspects:
Purity of black carborundum. Generally speaking, the higher the purity of silicon carbide, the better its corresponding physical properties. Such as hardness, toughness, grinding force, and thermodynamic performance will be better. Different grades of the silicon carbide block and the granulation process lead to different SiC purity. Firstly, the grade of silicon carbide blocks get first grade and other lower grades, and the silicon carbide used for grinding must be of first grade. Secondly, the sand and powder-making processes of various silicon carbide manufacturers are different, and the chemically treated silicon carbide abrasive removes most of the impurities and magnetic substances, resulting in a higher purity of SiC.
Particle size distribution of black carborundum. The particle size distribution of abrasive determines the consistency of abrasive particle size. The narrower the particle range, the higher the consistency. After making the product, the abrasive is evenly dispersed inside the grinding wheel or ceramic. It can improve the stability of the product. Especially for black carborundum microns, particle consistency must be achieved through a moisture process. Strictly controlling the pressure of water flow and dividing particles into narrower ranges through the slow flow of water is a more effective method. Relatively, the particle size screened by wind is not easy to achieve this effect.
The particle structure of black carborundum. The particle shape of silicon carbide grain & powder can be achieved through crushing and shaping processes to achieve the desired shape. Firstly, the shape of silicon carbide particles produced by ball milling is more rounded and has fewer sharp corners, making them suitable for grinding. Especially for ultrafine powder silicon carbide, it will not cause scratches on the workpiece due to sharp corners. Secondly, the shape of silicon carbide micro powder, which is first crushed by the air flow grinding process and then classified, will also be more rounded. Relatively speaking, the black silicon carbide particles crushed by Raymond grinding have many edges and corners, making them suitable for producing abrasive products. Once again, coated abrasives have different requirements for particle shape. This type of abrasive requires a slender and angular particle shape, which can cause one side of the particles to adhere to the substrate, and the exposed part of the adhesive plays a grinding role. Finally, the particle size of black silicon carbide abrasives can also cause differences in packing density. That factor is particularly important for the production of bonded abrasives. High packing density is helpful for the production of bonded abrasives.
The toughness of black carborundum. Silicon carbide material is a kind of hard and brittle abrasive material. But for many purposes, the toughness of abrasive powder can help improve the service life of products. The toughness of silicon carbide get from the carbonaceous raw materials of silicon carbide. The carbonaceous materials for smelting silicon carbide are anthracite and petroleum coke. Compared with anthracite, black silicon carbide smelted from petroleum coke has higher toughness. In the meantime, its color is not as black as that smelted from anthracite.
Cleanliness of black carborundum. The fragmentation of black silicon carbide into different particle sizes will release residual carbon and silicon in the silicon carbide material. During the fragmentation process, a lot of dust will also be generated. It will affect the adhesion performance of the bond to the abrasive. Making silicon carbide ceramics or grinding wheels can affect the strength of the product. After chemical treatment and washing with pure water, the surface of silicon carbide particles will be very smooth. That helps the binder to hold the abrasive, thereby improving the strength and lifespan of the product.
