Green silicon carbide grit 220 mesh

• Product introduction of Green Silicon Carbide grit 220 mesh

Green silicon carbide grit 220 mesh is made of petroleum coke and high-quality silica as the main raw materials, adding salt as an additive. Then smelted at high temperature in a resistance furnace. It is a kind of green crystal, brittle and sharp. Green silicon carbide is also called Green Carborundum(GC). The microscopic shape of GC grit is hexagonal. The Mohs hardness of green silicon carbide is 9.4, the micro-density hardness is 2940-3300kg/mm2, and the Knoop hardness is 2670-2815kg/mm2. It is higher than fused corundum in abrasives and second only to diamond and cubic boron nitride. and boron carbide. The density of GC grit is generally considered to be 3.20-3.25g/cm3. The natural bulk density of green silicon carbide abrasives is between 1.2–1.6g/cm3, and the specific gravity is 3.20-3.25g/cm3.

• Typical physical properties of Green silicon carbide grit 220 mesh

• Chemical analysis of Green silicon carbide grit 220 mesh

• Product Feature of Green silicon carbide grit 220 mesh

  1. High oxidation resistance ability.

  When heated to 1000°C in air, silicon carbide oxidizes only on the surface, forming a silicon dioxide film, which can protect the silicon carbide material from oxidation.

  Heated to 1300 °C, cristobalite begins to precipitate in the silicon dioxide film layer, and the transformation of the crystal form causes the film layer to crack, and the oxidation rate increases slightly.

  Heated to 1500-1600°C, the silicon dioxide film layer will thicken, and the protection against oxidation will be enhanced, which leads to the stability of silicon carbide at high temperatures. When heated to above 1627 °C, the oxidation resistance of silicon carbide will decrease rapidly.

  2. Good chemical stability.

  The chemical stability of silicon carbide is also due to its ability to resist oxidation.

  3. High hardness

  The hardness of silicon carbide is between corundum and diamond, the Mohs hardness of black silicon carbide is 9.2-9.3, the Mohs hardness of green silicon carbide is 9.4-9.5, and the Vickers hardness is 3100-3400kg/mm2. The hardness of silicon carbide will also decrease with the increase of temperature. At a high temperature of 1200 degrees, the hardness of silicon carbide can reach 2 times that of corundum.

  4. Excellent toughness

  The toughness of silicon carbide abrasive refers to the difficulty of breaking under the action of external force. Taking 46 mesh as an example, the toughness of the static pressure test is about 68-78%.

  The mechanical strength of silicon carbide is higher than that of corundum. Taking 120 mesh particle size as an example, the compressive strength of silicon carbide is 186KN/cm2, and the compressive strength of corundum abrasive is 100KN/cm2.

  5. Color of Silicon Carbide

  Silicon carbide is divided into black silicon carbide and green silicon carbide. Its color is due to the content and type of impurities present in the crystal. The black silicon carbide is light blue-black, and the first grade black silicon carbide is 98% pure; the green silicon carbide is green, and the first grade green silicon carbide is 99% pure.

  6. High thermal conductivity and linear expansion coefficient.

  At 25-1400 °C, the average thermal expansion coefficient of silicon carbide is 4.4×10-6/℃, while the thermal expansion coefficient of corundum is 7-8×10-6/℃.

  7. Electrical conductivity of silicon carbide

  Due to the introduction of impurities, silicon carbide has semiconductor properties. The conductivity of silicon carbide increases rapidly with the increase of electric field strength, and has the characteristics of nonlinearity. In addition, the conductivity of silicon carbide also changes with temperature.

• Applications of Green silicon carbide grit 220 mesh

1. Precision polishing for hard optical glass such as camera lens.
2. Abrasive raw material for GC grinding disc and other abrasive tools.
3. Sandblasting for copper, copper alloy, etc.
4. Abrasive blasting on hard metal materials such as titanium alloy, carbide alloy, etc.
5. Polishing and grinding quartz glass.
6. Grinding hard stone, marbles, granite, etc.
7. Polishing PZT/ Piezoelectric ceramic.
8. Surface treatment on diamond tools.
9. Polishing jewelry such as diamond and cinnabar.
10. Grinding other thin brittle material precise component.
11. Wear resistance materials.

• Specification of Green Silicon Carbide Grit

• Production details of Green Silicon Carbide Grit

• Packing of Green Silicon Carbide Grit

• FAQ

Q: What is the difference between green silicon carbide and black silicon carbide?

A: First of all, Green silicon carbide has a higher purity of SiC(99%), black silicon carbide SiC purity is min 98%. Secondly, green silicon carbide is harder than black silicon carbide.

Q: Is the green silicon carbide powder from you by airflow sieving or water sieving?

A: Our green silicon carbide powder is made by the water sieving process. So the particles are of high consistency.

Q: What are the HS code and CAS NO. of silicon carbide?

A: HS code is 2849200000. CAS NO. is 409-21-2.

Q: Is there any restriction to export silicon carbide material from China?

A: Yes, it has to get an export license to export. We will provide it to customs.

Q: How many kgs of free samples can we get?

A: We provide free samples of less than 1 kgs. Clients have to bear the express cost and DGM certificate cost.

Q: How do you inspect products before delivery?

A: Our technicians will check items of chemical, density, particle size distribution, and packing before delivery. After delivery, we keep samples of each batch for 3 months.

Q: Do you demand MOQ?

A: MOQ is 1 bag, always goes 25kgs. The transportation cost will be higher than that of 1MT.

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