Black silicon carbide is used to grind cast iron, non-ferrous metals, rubber, leather, plastic, wood, mineral rocks, etc.
Black silicon carbide (C) is produced by petroleum coke, quality silicon sand and appended with salt in an electric arc furnace at high temperatures. The hardness and brittleness are lower than that of green silicon carbide. The materials are used to grind cast iron, non-ferrous metals, rubber, leather, plastic, wood, mineral rocks,etc. It can also be used to manufacture high-class refractory products.
| Grain Usages and Types | ||
| Usage | For bonded abrasives | For coated abrasives |
| Type | C | C-P |
| Physical Characteristics | |||||
| Item | Basic mineral | Crystal system | Crystal color | Mohs hardness | Density |
| Black silicon carbide | α- SiC | Hexagonal | Black | 9.15 | ≥3.12g/cm3 |
| Item | Micro hardness | Electrical resistivity | Grinding ability (compared with diamond as one) | Linear expansion coefficient (when 900℃ α•10-6k-1) | |
| Black silicon carbide | HV3100-3280 | 3×105-3×107Ω•cm | 0.25 | 4.4 | |
| Chemical Composition (GB/T 2480-2008) | ||||
| Type | Grit | Chemical composition（%，by weight） | ||
| SiC | F.C | Fe2O3 | ||
| C | F4-F90 | ≥98.60 | ≤0.20 | ≤0.40 |
| F100-F150 | ≥98.10 | ≤0.25 | ≤0.50 | |
| F180-F220 | ≥97.20 | ≤0.30 | ≤0.55 | |
| F230-F280 | ≥97.20 | ≤0.30 | ≤0.55 | |
| F320-F500 | ≥97.00 | ≤0.35 | ≤0.60 | |
| F600-F800 | ≥96.50 | ≤0.40 | ≤0.60 | |
| F1000-F1200 | ≥95.50 | ≤0.50 | ≤0.70 | |
| C-P | P12-P100 | ≥98.60 | ≤0.20 | ≤0.40 |
| P120-P150 | ≥98.10 | ≤0.25 | ≤0.50 | |
| P180-P220 | ≥97.20 | ≤0.30 | ≤0.55 | |
| P240-P360 | ≥97.20 | ≤0.30 | ≤0.55 | |
| P400-P1000 | ≥97.00 | ≤0.35 | ≤0.60 | |
| P1200-P1500 | ≥96.50 | ≤0.40 | ≤0.60 | |
| P2000-P2500 | ≥95.50 | ≤0.50 | ≤0.70 | |
| Note: Special requirement on chemical composition can be satisfied through discussion. | ||||
| Optional Particle Sizes |
| F4-F220, F240-F1200, P12-P220, P240-P2500, JIS240#-4000# etc. |
| Note: Special specification can be customized according to customer's requirements. |
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