Talc is a kind of widely used layered silicate mineral. Different from other silicate nonmetallic minerals, talc has many unique characteristics.
1. Electrical insulation of talc
Talc itself is not conductive, when talc does not contain conductive minerals (such as siderite, pyrite, magnetite, etc.), its insulation is good. Talc electrical insulating porcelain is made from talc, which has high insulation. When the temperature rises, the electrical loss of talc is much lower and slower than that of ordinary electrical ceramics.
2. Heat resistance of talc
Talc is not only heat-resistant but also non-conductive, and its temperature resistance is as high as 1490 ~ 1510 ℃. The mechanical strength and hardness of talc increase, but the shrinkage rate is very low, and the expansion rate is very small. It is a kind of high-temperature-resistant non-metallic mineral material.
3. Chemical stability of talc
Talc generally does not react with strong acids (sulfuric acid, nitric acid, hydrochloric acid) and strong bases (potassium hydroxide, sodium hydroxide). Talc in 400 ° When C is mixed with other substances at high temperatures, there is no chemical change.
4. Oil absorption and covering power of talc
Talc powder has a strong adsorption capacity for oil, pigment, medicament, and impurities in solution. Superfine talc powder, due to its good dispersion, large specific surface area, and large covering area, can form a uniform fireproof and anti weathering film.
5. Lubricity of talc
Talc is soft and greasy, and its friction coefficient is less than 0.1 in a lubricating medium, so it is an excellent lubricating material. With the increase of talc content, the lubricity of talc increases.
6. Hardness variability of talc
If the talc is gradually heated to 1100 ℃., After cooling for about 2 hours, the shape of the talc remains unchanged, but the hardness increases, mainly because the talc has transformed into clinopyroxene.
7. Machinability of talc
Good machinability, with talc fragments or talc powder plus adhesive, semi-dry pressing method, wet pressing method, extrusion method or plastic method for processing molding, product performance unchanged.
Talc has many unique characteristics, so it is widely used. The comprehensive application of talc is inseparable from superfine grinding. The superfine roller grinding and Impact Superfine Grinding produced by ALPA powder are excellent equipment for producing ultra-fine talc powder and can produce 325-2500 mesh ultrafine talc powder. For more details, please feel free to consult.