Cryogenic powder
Our company's low-temperature magnesia powder is made of high temperature molten magnesia with MgO content greater than 93% as raw materials, after grinding and grinding, adding appropriate additives in proportion, and then calcining at high temperature.
1, high temperature resistance: has excellent electrical performance, low leakage current under low temperature conditions, is widely used in civil heat pipe.
2, high filling: good flow performance, filling into the heating tube is more dense, good thermal conductivity.
3, DM-3 does not add silicone oil, suitable for the production of high temperature treatment process heat pipe. DM-4 and DM-5 add silicone oil, with good moisture-proof performance, and can be used directly without sealing at both ends of the heating pipe. The production process is simple and the cost is low.
Comparison of chemical and physical properties
| Product name | Organic silicone oil treatment | Type | Chemical analysis% | Physical property | ||||||
| MgO | CaO | SiO2 | Fe2O3 | Al2O3 | Particle size distribution | Velocity of flow S/% | Tap to vibrate the density g/cm³ | |||
| Low-temperature magnesium powderMgO | No silicone oil treatment | DM-3 | ≥94 | ≤1.5 | ≤3.5 | ≤0.7 | ≤0.5 | 40-325 | 190±15 | 2.30-2.40 |
| Organic silicone oil treatment | DM-4 | 40-325 | 190±15 | 2.30-2.40 | ||||||
| Organic silicone oil treatment | DM-5 | 40-325 | 190±15 | 2.30-2.40 | ||||||
Comparison of electrical properties
| Type | Operating temperature℃ | Electrical property | |||||||
| Normal condition | Heating condition | Wet condition | |||||||
| Insulation resistance MΩ | Breakdown voltage V | Surface loadw/c㎡ | Leakage current mA | Breakdown voltage MΩ | Breakdown voltage V | Breakdown voltage MΩ | Breakdown voltage V | ||
| DM-3 | ≤500 | ＞1000 | ＞1800 | 5 | ＜0.2 | ＞2 | ＞1000 | 0 | 0 |
| DM-4 | ≤550 | ＞1000 | ＞1800 | 5.5 | ＜0.2 | ＞5 | ＞1200 | 0 | 0 |
| DM-5 | ≤600 | ＞1000 | ＞2000 | 6 | ＜0.1 | ＞15 | ＞1500 | 0 | 0 |
