Premium Quality Microsilica
Silicon metal powder is a semiconductor material that can be used to fabricate semiconductor devices, solar panels, fiber optics, and integrated circuits.
1.Ingredient List
Metallic silicon | ||||
Grade/spec | Si | Fe | Al | Ca |
≥ | ≤ | |||
553 | 98.5% | 0.5% | 0.5% | 0.3% |
441 | 99.0% | 0.4% | 0.4% | 0.1% |
421 | 99.2% | 0.4% | 0.2% | 0.1% |
411 | 99.3% | 0.4% | 0.1% | 0.1% |
3303 | 99.3% | 0.3% | 0.3% | 0.03% |
2202 | 99.5% | 0.2% | 0.2% | 0.02% |
1101 | 99.7% | 0.1% | 0.1% | 0.01% |
2502 | 99.4% | 0.25% | 0.25% | 0.02% |
Silicon metal content composition specifications:
Silicon metal powder silicon metal powder | ||||
Chemical industry metal powder | composition% | |||
Si | Fe | Al | Ca | |
Chemical industry metal powder | composition% | |||
Si | Fe | Al | Ca | |
≥ | ≤ | |||
99.6 | 0.2 | 0.15 | 0.05 | |
99.2 | 0.4 | 0.2 | 0.1 | |
99.0 | 0.4 | 0.4 | 0.2 | |
98.5 | 0.5 | 0.5 | 0.3 | |
98.0 | 0.6 | 0.5 | 0.3 | |
Metallurgical silicon metal powder | 99.6 | 0.2 | 0.15 | 0.05 |
99.2 | 0.4 | 0.2 | 0.1 | |
99.0 | 0.4 | 0.4 | 0.2 | |
98.5 | 0.5 | 0.5 | 0.3 | |
98.0 | 0.6 | 0.5 | 0.3 | |
Low grade silicon powder | 95-97 | impurity content≤4.0% | ||
90-95 | ||||
Specification | Silicon metal powder size can be customized:10-600mesh | |||
2. Related introduction
Although HPC with compressive strengths up to 100 MPa can be made by applying pure cement, it is much easier when silica fume is used. For the preparation of concrete with strengths over 100 MPa, the use of silica fume is almost indispensable. Silica fume is used in concrete as both a filling material and a volcanic ash material. The use of silica fume greatly reduces the pore size in the hydrated paste and improves the pore size distribution, thus increasing the strength and reducing the permeability. For example, it has been shown (CEB2FIP 1988) that to obtain a concrete strength of 70 MPa, the application of pure cement requires a water-cement ratio of 0.35, whereas when 8 % silica fume is added, the water-cement ratio can be 0.50. Since silica fume particles are very fine, they can react with volcanic ash within a few hours at a very early stage. According to Carette and Malhotra (1992), the contribution of silica fume to the strength of concrete is mainly before 28d. Therefore, in terms of long-term strength growth, silica fume concrete is generally considered inferior to pure cement concrete or fly ash concrete, and the results of tests on the strength development of NSC cited by Almad (1994) indicate that the increase in the amount of silica fume makes the early relative strength development lower, a phenomenon also found by Sandvik 1992 in concrete at 65 MPa.
However, although the early relative strength development of silica fume concrete is slower than that of pure cement concrete at the same water-cement ratio, the absolute strength of silica fume concrete is higher than that of pure cement concrete due to the significant increase in strength caused by the addition of silica fume. On the other hand, experience shows that the early strength development of HPC is faster than that of NSC, although the setting time of HPC may be slightly delayed, and its hydration after setting is greatly accelerated by the high-efficiency water reducing agent and silica fume. The result is usually a very rapid strength development after setting.
Compressive strength inversions have been reported for some air-dried or cured silica fume concrete specimens with very low water-cement ratios (De Larrard and Aiticin 1993). This strength reduction usually occurs after 90 d of age and is generally believed to be caused by internal self-drying and drying cracks. However, laboratory and field studies by many other researchers have shown no reduction in the late strength of HPC. For example, test results for all drill core specimens obtained from six different HPCs from 3 months to 3 ages show increasing strength. Of course, the long-term strength growth potential of the HPC is small compared to that of the NSC.
3. Product production
2. Quality control
3. Support sea,land, and air transportation
4. Support express delivery
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