Crucible, based on the natural crystalline graphite as the main raw material, refractory clay plasticity as a binder, the clinker with different types made of special alloy steel is mainly used in metallurgy, nonferrous metals and alloys melting refractory graphite crucible. On the product's performance, purposes, a graphite crucible is an integral part of the refractory.
Crucible can be divided into a graphite crucible, the crucible and metal clay crucible three categories. Graphite crucible, another P-type graphite crucible and shaped and high-purity graphite crucible graphite crucible three. Various types of graphite crucible, because of the different properties, uses and conditions of use, the use of raw materials, production methods, technology and products also has the distinction of model specifications.
The main raw material of the graphite crucible, is crystalline natural graphite. Therefore, it maintains the natural right of all kinds of physical and chemical properties of the original ink.
Namely: has good thermal conductivity and high temperature resistance, high temperature use, the thermal expansion coefficient, for emergency heat, quench with certain anti-strain properties. Acid, alkaline solution of anti-corrosive, has excellent chemical stability.
Crucible of model specifications more in the application subject to production scale, batch size and breed restrictions melting material, can be arbitrarily chosen, the applicability of the strong, and guaranteed to be melting purity substances.
Graphite crucible, because with more than excellent performance, so in metallurgy, casting, machinery, chemicals and other industrial sectors, is widely used in smelting alloy tool steel and non-ferrous metal smelting and alloys. And has a good technical and economic results.
Kind of crucible can be divided into three categories: the first category copper crucible, and its specifications, "No."; second category is the copper alloy crucible, especially round there are 100 numbers, 100 numbers in round, third crucible species steelmaking, there are 100 numbers.
Crucible specification (size), typically represented by sequence number size, the 1st crucible melts having brass 1000g volume, its weight is 180g. Crucible when melting metals or alloys of different melting calculation can crucible density specification number, multiplied by the corresponding coefficients of metals and alloys.
Raw materials crucible can be summarized into three types. First, the natural crystalline graphite, two fire plasticity
Clay, Third calcined kaolin hard skeleton clinker. In recent years, beginning with high temperature synthetic materials, such as: silicon carbide, alumina, silicon carbide and ferrosilicon do skeleton clinker crucible. This clinker to improve product quality crucible, crucible enhanced density and mechanical strength have a significant effect.
Crucible shape, there are three ways, more primitive ancient molding method is hand molded. The second is the third spin-molding method is compression-molding method.
Graphite crucible system using advanced fire-resistant containers natural flake graphite, wax stone, silicon carbide and other raw material for smelting, casting copper, aluminum, zinc, lead, gold, silver and various metals purposes.
1. After placing a dry place, avoid water intrusion; slow bake before use to 500 degrees Celsius before use.
2, should be based on the capacity of the crucible feeding, avoid too tightly packed to avoid the occurrence of thermal expansion of the metal crucible bursting.
3. When removing the molten metal, use a spoon to scoop out the best, minimize the use of calipers, should be consistent with the shape of the crucible If using calipers and other tools, to avoid local excessive force and shorten life.
4, the crucible life and usage-related, you should avoid strong oxidizing flame is injected directly into the crucible, the crucible material oxidation leaving short-lived.