The crucible can be divided into three categories: graphite crucible, clay crucible and metal crucible. In graphite crucible, there are three kinds of graphite crucible and special graphite crucible and high pure graphite crucible. Various types of graphite crucible, due to different properties, uses and conditions of use, the use of raw materials, production methods, process technology and product model specifications are also different.
The main raw material of the graphite crucible is the crystalline form of natural graphite. So it keeps all kinds of physical and chemical characteristics of natural right ink.
That is: with good thermal conductivity and high temperature resistance, in the use of high temperature, the thermal expansion coefficient is small, the heat and cold has a certain anti strain properties. For acid, alkaline solution has strong corrosion resistance, and has excellent chemical stability.
Crucible type specifications are more, in the application is not limited by the size of the production, batch size and the variety of smelting materials, can be arbitrary choice, strong applicability, and can ensure the purity of the melting material.
1, after placing the dry place, avoid rain intrusion; use before the slow bake to 500 degrees Celsius can be used.
2, should be based on the crucible capacity feeding, avoid squeeze too tight, so as to avoid the metal thermal expansion of the crucible.
3, remove the molten metal, the best use spoon to scoop out, to minimize the use of calipers, if using calipers and other tools should and crucible shapes consistent, to avoid local stress and shorten the service life. 4. The service life of the crucible is related to the use of the method. It should avoid the strong oxidizing flame directly spray to the crucible, and make the crucible raw material oxidation. Graphite crucible, because of its excellent performance, so in metallurgy, casting, mechanical, chemical and other industrial sectors, is widely used in the smelting of alloy tool steel and non-ferrous metals and alloys. And has a good technical and economic results.