The production process will not pollute the raw materials, ensuring the purity of the raw materials, and can be used repeatedly for a long time in the high temperature of more than 1400℃, saving the production cost.
Laboratory use Si3N4 crucible is made of pneumatic sintering method, which has good acid resistance and weak alkali corrosion ability. Such as boiled hydrochloric acid, concentrated nitric acid, royal water, sulfuric acid, sulfuric acid and the concentration of less than 25% aluminum hydroxide solution. This dense silicon nitride has excellent antioxidant properties and can be stably used stably in an oxidation atmosphere below 1400℃. Silicon nitride material also has a good stability on metal melt, no wetting, such as molten metal zinc, gold, silver, aluminum, cadmium, indium, lead, gallium, germanium and its alloys such as brass, dura, nickel and silver have good corrosion resistance. Refractory silicon nitride crucible prepared from silicon nitride ceramic material is a good substitute for silicon dioxide crucible. After experiment, a silicon nitride ceramic crucible prepared silicon material crystallization for five consecutive times, and the silicon material quality is similar to that of the material recrystallized from the standard silicon dioxide crucible. There are conservative estimates that a crucible prepared from a silicon nitride ceramic can be reused at least 10 times.