The raw material of quartz ceramic crucible is quartz ceramic, which is close to the characteristics of quartz glass in many aspects, but it also has its own characteristics, such as better impact resistance than quartz glass; Quartz crucibles can produce crucible products of various sizes and shapes.
The main properties of quartz ceramic crucibles are:
1. Thermal performance Fire resistance: 1740 ℃ Thermal conductivity: 0.5 kcal/m at 20 ℃ At that time Specific heat: 0.27 calories per gram Thermal stability: The sample does not explode three times under sudden temperature changes of 1100 ℃ -20 ℃ (water-cooled). High temperature: 1660 ℃ Thermal expansion coefficient: 0.5 × 10-6 1/℃
2. Physical properties: Bulk density of 1.9-1.95g/cm3, porosity of<15%, compressive strength of>45MPa
3. Chemical properties Chemical composition: SiO2 content>99.5% Corrosion resistance to hydrochloric acid, sulfuric acid, chlorine gas, phosphoric acid Corrosion resistance to alkali and alkali metal and their salts Corrosion resistance
4. Electrical properties Electric breakdown strength: 16-20KV/mm Dielectric loss tangent angle (20-1300 ℃) 0.0002-0.012 Dielectric constant (20-1300 ℃) 3.17-3.42