Overview of black silicon carbide granular sand:
Black silicon carbide is made of quartz sand, petroleum coke and high-quality silica as the main raw materials, and is smelted at high temperature in a resistance furnace. Its hardness is between corundum and diamond, mechanical strength is higher than corundum, and it is brittle and sharp.
Main Specifications:
Name product | Specification model | Exterior color | purity(%) | iron(%) | carbon(%) |
Black silicon carbide (F sand) |
F16#—F240# |
pure black |
≥98.5 |
≤0.02 |
≤0.01 |
Black silicon carbide (P sand) |
P16#--P240# |
纯黑色 |
≥98.5 |
≤0.02 |
≤0.01 |
Other indicators and specifications, customized services can be provided according to user requirements
Industrial classification of black and green silicon carbide:
The industrial production method of silicon carbide is to use high-quality quartz sand and petroleum coke (salt is needed to produce green silicon carbide) in a resistance furnace. The refined silicon carbide blocks are crushed, washed with acid and alkali, magnetic separation, sieving or water selection to produce products of various particle sizes.
There are two basic varieties of silicon carbide, black silicon carbide and green silicon carbide, both of which belong to α-SiC.
① Black silicon carbide contains about 98.5% of SiC, and its toughness is higher than that of green silicon carbide. It is mostly used to process materials with low tensile strength, such as glass, ceramics, stone, refractory materials, cast iron and non-ferrous metals.
② Green silicon carbide contains more than 99% SiC and has good self-sharpening properties. It is mostly used for processing hard alloys, titanium alloys and optical glass, as well as for honing cylinder liners and fine grinding high-speed steel tools. In addition, there is cubic silicon carbide, which is a yellow-green crystal prepared by a special process. The abrasive tool used to make is suitable for super-finishing of bearings. The surface roughness can be processed from Ra32～0.16 microns to Ra0.04～ 0.02 microns.
Main uses of black silicon carbide:
Due to its stable chemical properties, high thermal conductivity, low thermal expansion coefficient, and good wear resistance, silicon carbide has many other uses besides being used as abrasives. For example, silicon carbide powder is applied to the impeller or cylinder of a water turbine by a special process. The inner wall can improve its abrasion resistance and prolong its service life by 1 to 2 times; the high-grade refractory material made of it has heat shock resistance, small size, light weight, high strength and good energy-saving effect. Low-grade silicon carbide (containing about 85% of SiC) is an excellent deoxidizer. It can speed up the steelmaking speed, and facilitate the control of chemical composition and improve the quality of steel. In addition, silicon carbide is also widely used to make silicon carbide rods for electric heating elements.
Silicon carbide has high hardness and excellent thermal conductivity. It is a semiconductor and can resist oxidation at high temperatures.
