Carborundum abrasives
Carborundum abrasives also callled silicon carbide (SiC) abrasives are super-hard artificial minerals (with a Mohs hardness of 9.5) synthesized by high-temperature smelting of quartz sand and petroleum coke as core raw materials. Carborundum abrasives divided into two major categories: black silicon carbide and green silicon carbide. Due to its high thermal conductivity, high-temperature resistance and impact resistance, it has become an irreplaceable core grinding medium in precision manufacturing, refractory materials and the semiconductor industry.
Production process
High purity and precise particle size control
Raw material ratio and smelting
Mix quartz sand and petroleum coke (green silicon carbide needs to be mixed with salt), and react at a high temperature of 1800 to 2000℃ in a resistance furnace for 100 to 120 hours to form silicon carbide crystals.
Adding 0.5 to 5% metallic aluminum can enhance the crystal hardness and optimize the grinding performance.
01
Crushing and Shaping
The particles are roughly crushed to ≤5mm, and then processed by a shaping machine into elliptical particles ≤2mm (accounting for ≥80%), which enhances the subsequent grinding efficiency
02
Fine grinding and classification
Ball milling process: Wet ball milling or jet milling is adopted, with a controlled rotational speed of 200 r/min, a ball-to-material ratio of 10:1, and a duration of 40 hours, to obtain micro-powder with a d50 of 9.5 to 11.5μm.
Graded purification
Primary vortex classification: Separate the finished product A (particle size 6.5-5.5μm);
Secondary impeller classification: Extract ultrafine powder B (3.0-4.5μm), meeting semiconductor-grade requirements.
03
Post-processing
Acid washing is used to remove surface oxides, followed by magnetic separation for iron removal after drying to ensure a purity of ≥98%.
04
Application fields and typical products
Abrasive and grinding tool manufacturing
Bonded grinding tools: resin/ceramic grinding wheels, cutting discs (black carborundum abrasives is suitable for cast iron and stone; Green carborundum abrasives is used in hard alloys.
Coated abrasives: sandpaper, abrasive belts (P24-P400 grit size), highly efficient for grinding metals and woods.
Free abrasive: Sandblasting (G16-G80 particle size), to clean the oxide layer on the surface of steel structures.
High-end material processing
Semiconductor slicing: Green silicon carbide micro-powder is used to cut monocrystalline silicon rods with precision reaching the μm level.
Optical component polishing: W20-W40 micro-powder is used for fine polishing of glass and sapphire surfaces.
Refractory Materials and Metallurgy
High-temperature kiln furniture (push plates, saggars), blast furnace linings, heat shock resistance is enhanced, and the service life of equipment is increased by 30%.
Metallurgical deoxidizer, enhancing the purity of molten steel.
Carborundum abrasives grain sizes
| Chemical Composition (%) | |||||
| Model | Particle Size |
SiC |
F.C. |
Fe2O3 |
|
| C -- Black Silicon Carbide |
F4-F90 |
P12-P100 |
≥ 98.80 |
≤ 0.15 |
≤ 0.15 |
|
F100-F150 |
P120-P150 |
≥ 98.50 |
≤ 0.20 |
≤ 0.20 |
|
|
F180-F220 |
P180-P220 |
≥ 98.30 |
≤ 0.25 |
≤ 0.25 |
|
| Chemical Composition (%) | |||||
| Model | Particle Size |
SiC |
F.C. |
Fe2O3 |
|
| GC -- Green Silicon Carbide |
F4-F90 |
P12-P100 |
≥ 99.20 |
≤ 0.15 |
≤ 0.15 |
|
F100-F150 |
P120-P150 |
≥ 98.80 |
≤ 0.20 |
≤ 0.20 |
|
|
F180-F220 |
P180-P220 |
≥ 98.40 |
≤ 0.20 |
≤ 0.20 |
|
Packaging
1. 25kg or 20kg/woven bag;
2. 25kg or 20kg/kraft paper bag;
3. Moisture-proof plastic lining;
4. 1000 kg/ton plastic ton bag;
5.Carton;
6. Plastic film;
7. Wooden pallets.
All packaging can be customized according to customer requirements.
Products Description
Q: Are you a trading company or manufacturer?
A: We are a manufacturer enterprises of abrasives over 20years.our products have competitive price and quality guarantee. Welcome to send your inquiry!
Q: Do you provide samples ? is it free or extra ?
A: Yes, we could offer the sample for free charge but you need to pay the cost of freight.
Q:How do you manufacture abrasives?
A:Grinding → Wet classification (granulation) → Drying → Bagging.
Q: How long is the lead time?
A: Except OEM products, generally 5-7 days for trial order, 10-20 days for mass order once deposit received.
Q:How about your after-sale service ?
A: If any technical or quality problem after you receive the cargo, you can contact us any time.If the problem caused by us, we will send you free goods for replacement or refund your loss.
Q:Can we have a visit to your factory?
A:You're warmly welcoming to visit our plant. And please inform me of your scheduled time in advance, we'll pick you up and arrange the agenda for you.
Q:Can I use my own design package?
A:Yes, The package can be with your logo.
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