The parameters of silicon metal powder are centered on "size, purity, and composition," which directly determine its reactivity, suitable application scenarios, and product value. Key parameters and standard requirements are as follows:
| Parameter Type | Core Indicator | Standard Requirement Range | Core Impact |
| Physical Parameters | Size (mesh count / micrometers) | 100 mesh (150μm), 200 mesh (74μm), 325 mesh (45μm), 400 mesh (38μm) | The larger the mesh count, the larger the specific surface area and the higher the reactivity. |
| Composition Parameters | Silicon (Si) Content | Industrial Grade ≥98%, Chemical Grade ≥99.5% | Higher purity means less interference from impurities, making it suitable for high-end applications. |
| Impurity Parameters | Fe/Al/Ca Content | Industrial Grade ≤2.0%/2.0%/0.8% | Excessive impurities will affect the performance of the end product (such as strength and conductivity). |
| Performance Parameters | Specific Surface Area (m²/g) | 200 mesh: 1-3; 400 mesh: 3-5 | The larger the specific surface area, the faster the chemical reaction rate. |
| Safety Parameters | Moisture Content | ≤0.5% | Excessive moisture content can easily lead to porosity in castings and abnormal chemical reactions. |
Specific Impact of Core Parameters on Application Effects
(1) Size: Key to Reactivity and Processing Suitability
100 mesh (150μm):
Specific surface area 1-2m²/g, slow dissolution rate, suitable for ordinary casting and refractory material filling; an addition amount of 1.5%-2.0% is required to achieve the same effect;
200 mesh (74μm):
Specific surface area 2-3m²/g, balanced reactivity, suitable for aluminum alloy smelting and organosilicon synthesis; silicon recovery rate 85%-90%, the preferred general-purpose type;
325 mesh (45μm):
Specific surface area 3-4m²/g, good dispersibility, suitable for precision casting and high-end refractory materials; casting surface finish Ra≤0.8μm;
400 Mesh and above (≤38μm):
Specific surface area ≥5m²/g, extremely high activity, suitable for electronic-grade materials and photovoltaic polycrystalline silicon production; impurity removal difficulty and cost increase simultaneously.
(2) Purity and Composition: Core Basis for Scenario Adaptation
Industrial Grade (Si≥98%):
Higher impurity content, lower cost, suitable for building profile aluminum alloys and ordinary refractory materials;
Chemical Grade (Si≥99.5%):
Impurities Fe/Al/Ca≤0.3%, suitable for organosilicon synthesis and fine chemicals, silicon conversion rate reaches over 90%;
Applications of Silicon Metal Powder in All Scenarios
(1) Aluminum Alloy Industry: Core Additive for Performance Enhancement
Mechanism of Action: Silicon atoms dissolve into the aluminum matrix, causing lattice distortion, increasing strength and hardness, and improving casting fluidity;
Suitable Parameters: 200 mesh industrial grade for ordinary aluminum alloys, 325 mesh chemical grade for high-end aluminum alloys.
(2) Organosilicon Industry: Core Raw Material to Ensure Reaction Efficiency
Mechanism of Action: Reacts with methyl chloride to generate methylchlorosilane, a basic intermediate for silicone rubber, silicone oil, and silicone resin;
Suitable Parameters: 200-325 mesh chemical grade is commonly used, 400 mesh chemical grade is used for high-end organosilicon.
(3) Refractory Materials Industry: Key Additive for Improving High-Temperature Performance
Mechanism of Action: Fills the pores of refractory materials, reacts with other components at high temperatures to form mullite (3Al₂O₃・2SiO₂), strengthening the structural density;
Suitable Parameters: 100-200 mesh for ordinary refractory materials, 325 mesh for high-end kiln linings.
Selection and Usage Control Points
(1) Selection Logic: Match parameters according to the scenario
| Application Scenarios | Recommended Parameter Combinations | Core Selection Criteria |
| Ordinary aluminum alloy, architectural profiles | 200 mesh, industrial grade (Si≥98%) | Balanced cost-performance ratio, meeting basic performance requirements |
| Organosilicon, Fine Chemicals | 200-325 mesh, Chemical Grade (Si≥99.5%) | High conversion rate, reduced byproducts |
| Precision casting, high-end refractory materials | 325 mesh, chemical grade (Si≥99.5%) | Uniform dispersion, improving product density |
(2) Usage Precautions
Size Matching Processes:
Melting Processes (Aluminum Alloys, Casting): Select 200-325 mesh to avoid oxidation and burn-off of excessively fine powder (loss rate increases from 5% to 15%).
Powder Mixing Processes (Coatings, Adhesives): Select 325-400 mesh to ensure uniform dispersion and no agglomeration.
Storage Protection:
Store in a dry, well-ventilated environment (humidity ≤60%), in sealed packaging. Shelf life should not exceed 6 months to prevent moisture absorption and clumping.
Electronic grade products require vacuum packaging to prevent oxidation from affecting purity.
Safe Operation:
Dust generated during processing must be collected using a bag filter (dust concentration ≤10mg/m³) to avoid inhalation hazards.
Avoid storage with strong oxidizers to prevent oxidation reactions at high temperatures.
