The requirements for black silicon carbide in the production of sponge sandpaper blocks
The requirements for black silicon carbide in the production of sponge sandpaper blocks mainly include the following aspects:
1. Chemical purity requirements
The silicon carbide content must be ≥98%, and the impurity content (such as SiO₂, Fe₂O₃) must be strictly controlled at a low level (such as SiO₂≤1%, Fe₂O₃≤0.1%) to ensure the high grinding efficiency and stability of the material.
The smelting raw materials must use high-purity quartz sand (SiO₂ purity ≥98.5%) and carbon materials such as petroleum coke to ensure that the final product has a low impurity content.
2. Particle size distribution and particle shape
A concentrated distribution particle size specification (such as P standard) must be used, with a high proportion of basic particles, and the content of large particles and fine powder must be strictly controlled to improve grinding efficiency and reduce sand removal. Haixu Abrasive Factory strictly follows the P standard to produce, and the production size is P12 P16 P20 P24 P30 P36 P40 P50 P60 P80 P100 P120 P150 P180 P220 P240 P280 P320 P360 P400 P500 P600 P800 P1000 P1200 P1500 P2000 P2500 P3000 P4000 P5000.
It is recommended to use polygonal or conical particles to enhance the grinding force
3. Physical property requirements
The stacking density needs to be moderate (usually P standard is lower than F standard sand) to adapt to the flexible structure of sponge sandpaper.
The true density needs to be maintained at 3.20-3.25g/cm³ to ensure the hardness and durability of the material.
4. Processing and treatment technology
It needs to undergo two pickling treatments: cleaning before crushing to remove free carbon/silicon, and secondary cleaning after screening to reduce suspended matter, improve cleanliness and hydrophilicity, thereby enhancing the bonding performance with the substrate.
5. Application performance requirements
It needs to have high thermal conductivity and low thermal expansion coefficient to cope with the heat generated by high-speed grinding.
It needs to have good hydrophilicity to facilitate uniform attachment of particles to the sponge matrix and extend the service life of the sandpaper.
The above requirements combine the key indicators of black silicon carbide in chemical purity, physical properties and processing technology to ensure the efficient grinding force and durability of the sponge sandpaper sand block.