200mesh silicon metal powder is a fine powder produced by crushing, grinding, and classifying industrial silicon (Si≥98%). The standard 200-mesh corresponds to a size of approximately 74μm, but in actual production, the size distribution is concentrated between 50-100μm, with a pass rate ≥95%.
Core Production Process:
Industrial silicon blocks → Coarse crushing (10-20mm) → Fine grinding (air jet mill/mechanical mill) → Classification and screening (200-mesh standard sieve) → Iron removal and purification → Drying (100-120℃, 2-3 hours) → Packaging and warehousing
Core characteristics determine its adaptability to multiple scenarios
Purity Classification:
High-end grade: Si≥99.5%, impurities Fe≤0.2%, Al≤0.2%, Ca≤0.02%;
Industrial grade: Si≥98.0%, impurities Fe≤0.4%, Al≤0.4%, Ca≤0.1%;
Ordinary grade: Si≥97.0%, impurities... Fe≤0.8%, Al≤0.8%, Ca≤0.3%;
Core differences from coarse-grained silicon metal:
| Comparison Dimensions | 200mesh silicon metal powder | Lump/granular silicon metal |
| Reactivity | High (large specific surface area, sufficient contact) | Low (limited contact area) |
| Processing Compatibility | Suitable for powder mixing, coating, injection molding, and other processes. | Suitable for high-temperature processes such as smelting and alloying. |
| Dispersibility | Easily dispersed, requires protection from moisture and clumping | Difficult to disperse, convenient to store |
| Application Scenarios | Fine-scale production (electronics, coatings, catalysts) | Large-scale production (alloy smelting, chemical raw materials) |
Core application scenarios of silicon metal powder 200mesh
(1) Alloy preparation: Refined strengthening additive
Aluminum-silicon alloy production:
Mechanism of action: The powder is easily and uniformly dispersed in molten aluminum, silicon atoms are fully dissolved, causing lattice distortion, and improving the strength and hardness of the alloy;
Quantitative effect: Adding 5%-8% of 200-mesh industrial-grade silicon metal powder (Si≥98%) increases the tensile strength of aluminum alloy from 200MPa to 280MPa, increases hardness by 50%, and improves casting fluidity by 30%, making it suitable for precision die-casting parts for automobiles and aerospace parts;
Steel/copper alloy modification:
Adding 0.3%-0.5% can improve the wear resistance of steel and the corrosion resistance of copper alloys, making it suitable for mechanical wear-resistant parts and electrical contact parts.
(2) Electronics Industry: Semiconductor and Electronic Material Raw Materials
Semiconductor Auxiliary Materials:
High-grade metallic silicon powder (Si≥99.5%) is selected. After purification, it can be used to prepare polycrystalline silicon and monocrystalline silicon for semiconductor chip substrates. The total impurity content is required to be ≤0.1%.
Electronic Packaging Materials:
As a filler added to epoxy resin, the addition amount is 20%-30%, which can improve the thermal conductivity and mechanical strength of the packaging material and is suitable for electronic component packaging.
(3) Chemical Industry: High-Efficiency Catalysts and Supports
Catalytic Applications:
As a catalyst for organic synthesis reactions (such as methane conversion and hydrogenation), the powder surface has many active sites, which can increase the reaction conversion rate to over 95% and the selectivity to 98%.
Catalyst Supports:
After loading precious metals, they are used for tail gas treatment and chemical synthesis. The specific surface area advantage can improve the dispersibility of precious metals and reduce the catalyst dosage by 30%-40%.
(4) Coatings and Paints: Functional Fillers
Anti-corrosion and Wear-resistant Coatings:
Adding 15%-25% can improve coating hardness, wear resistance, and corrosion resistance, suitable for industrial equipment coatings and marine engineering anti-corrosion coatings;
Architectural/Machinery Coatings:
Improves coating adhesion and anti-aging performance, extends coating service life by 2-3 times, and reduces coating shrinkage, reducing the risk of cracking.
(5) Other Special Applications
Ceramics and Abrasives:
Adding 10%-15% improves the strength and wear resistance of ceramic products, suitable for ceramic grinding wheels and precision ceramic parts;
Rubber Modification:
Adding 5%-10% as a filler enhances the tensile strength and aging resistance of rubber.
Key Points for Exporting 200 Mesh Silicon Metal Powder
(1) Export Compliance Requirements
Customs Code: 28046900 (Other silicon powders must specify size and purity);
Inspection Standards: Must comply with the standards of the export destination (e.g., EU REACH, US ASTM, Japan JIS), and provide an SGS/Intertek test report (including purity, size, impurities, moisture, etc.);
Packaging Specifications: Double-layer moisture-proof packaging (inner PE film + outer kraft paper bag/iron drum), 25kg per bag or 50kg per drum, labeled with the warning "Moisture-proof, shockproof, keep away from open flame," and accompanied by a product certificate and test report.
(2) Export Precautions
Purity Matching: Match the purity according to the industry requirements of the destination. For the electronics and semiconductor industries, high-end grade Si≥99.5% is required, while industrial grade Si≥98.0% can be used for general industrial applications.
Transportation Requirements: As general cargo, no special transportation qualifications are required, but humid environments must be avoided (moisture-proof film is required for sea freight) to prevent powder agglomeration.
Document Preparation: A complete set of foreign trade documents, including commercial invoice, packing list, bill of lading, test report, and certificate of origin, must be provided to ensure smooth customs clearance.
