SINASILICA
Fused silica
Fused silica
Fused silica is a key functional material. It is produced by processing high-purity natural quartz through unique techniques such as high-temperature treatment, transforming its molecular structure from ordered to disordered, resulting in high-purity silica powder.
The powder is white, high purity and has the following characteristics: extremely low linear expansion coefficient; good electromagnetic radiation; stable chemical properties such as chemical corrosion resistance; reasonable, orderly and controllable particle size distribution.
It has the following characteristics: chemical stability, acid and alkali resistance, large specific surface area, well-developed pores, high surface activity, high oil absorption rate, strong thickening ability, high temperature resistance, good electrical insulation, and UV resistance.
2. Our company's product specifications table:
Melted Silicon Micropowder Specifications | |||||||||
400 mesh | 600 mesh | 800 mesh | 1000 mesh | 1500 mesh | 2000 mesh | 3000 mesh | 4000 mesh | 6000 mesh | 8000 mesh |
3. Basic performance parameters of molten silicon micro-powder:
chemical composition | physical property | ||
SiO2 % | 99.9 | crystalline state | amorphous |
Fe2O3 % | ≤0.010 | melting point ℃ | 1700 |
Al2O3 % | ≤0.10 | boiling point ℃ | 2230 |
M str % | ≤0.02 | density g/cm | 2.21 |
ignition lost % | ≤0.10 | Moh's hardness | 6 |
Electrical conductivity (μs/cm) | ≤3 | pack kg | 20 |
Basic characteristics of molten silicon powder:
project | unit | representative value |
surface | / | White powder |
density | kg/m3 | 2.20×103 |
Moh's hardness | / | 6.0 |
dielectric constant | / | 3.88（1MHz） |
insertion loss | / | 0.0002（1MHz） |
linear expansion coefficient | 1/K | 0.5×10-6 |
thermal conductivity | W/K·m | 1.1 |
refraction coefficient | / | 1.45 |
Melted silicon micropowder can be classified by the following characteristics and customized to meet customer requirements:
project | index of correlation | explain |
fineness | SiO2 content | Available within 99.5-99.9% |
impurity of ion | Na+、Cl- class | It can be as low as below 1 ppm. |
distribution ofsize | D50 | Available in D50=0.2-30 μm |
distribution ofsize | It can be adjusted based on the typical distribution as required. including multi-peak distribution, narrow distribution, etc. | |
Appearance characteristics | whiteness, transparency, etc. | The whiteness can be selected in the range of 90-98; Provide high transparency products. |
character of surface | hydrophobicity, oil absorption value, etc. | Different functional agents can be selected according to customer requirements. |
4. Characteristics and advantages of molten silicon micro-powder:
Melted silicon micropowder is a specialized powder produced from natural quartz through a unique manufacturing process. The raw material is high-purity amorphous silicon dioxide that undergoes high-temperature melting and cooling. This product boasts exceptional properties including low thermal expansion coefficient, minimal internal stress, superior moisture resistance, and low radioactivity. Key characteristics include: an extremely low linear expansion coefficient; excellent electromagnetic radiation performance; stable chemical resistance to corrosion; and a well-organized, controllable particle size distribution. It is widely used in electronic packaging, investment casting, premium electrical insulation, coatings, and silicone rubber industries.
Advantages of molten silicon powder:
1. With a very low expansion coefficient, low viscosity, and high fluidity, it allows for high addition or filling amounts, thereby achieving excellent dimensional stability and reducing warpage.
2. Provides enhanced MSL performance while meeting the flame-retardant requirements of the eco-friendly EMC formulation design.
3. With exceptionally low ionic content, it delivers superior high-temperature and high-humidity storage performance and extended service life, while reducing packaging product failure rates.
4. Low viscosity and high fluidity save process time, improve production efficiency, and reduce production costs;
5. High purity, with extremely low dielectric constant (Dk) and dissipation factor (Df), enabling the fabrication of composite materials for high-frequency, high-speed applications with minimal signal loss.
V. Advantages and Applications of Molten Silicon Micro-powder
Melted silicon micropowder is a vital functional material characterized by chemical stability, acid/alkali resistance, large specific surface area, well-developed pores, high surface activity, excellent oil absorption, strong thickening properties, high-temperature tolerance, superior electrical insulation, and UV resistance. Its unique structure generates four major effects, enabling the synthesis of materials with unprecedented physical and chemical properties. These characteristics not only enhance traditional materials but also enable the creation of new ones, such as high-strength, ultra-hard, high-toughness, and superplastic materials; insulating and electrode materials; superconducting materials; specialized low-temperature sintered refractories; and heat exchange materials. The distinctive functions and structure of ultra-fine silicon micropowder have made it widely applicable in modern defense industries and various civilian fields, primarily used in coatings, paints, engineering plastics, adhesives, silicone rubber, precision casting, and advanced ceramics. It plays a significant role in driving technological advancements in related industries, improving the performance and quality of traditional products, and contributing substantially to industrial innovation.
