What Is Crucible?

Aug 03, 2020

You may not be familiar with crucibles, but the dry pot that you are most familiar with is probably a dry pot of good food, but the crucible that we are going to talk about is not a food pot. In fact, in ancient China, there is a record about the crucible "high furnace, crucible enough. Sprinkle a little salt, but copper, aluminum to the bottom of the pot.

Crucible is a kind of chemical instrument. Crucible is a kind of fireproof container used for melting and melting metal liquid or chemical reaction of substances, which is the basis for ensuring the smooth operation of chemical reaction. There are many different types of crucibles, but most of them are shaped more like garlic rammers.

The crucible may be made of the following materials: natural graphite of crystalline substance, plastic refractory clay, and rigid kaolin skeleton clinker after calcination. Generally, crucible is used to burn solid materials. Because sometimes, crucible is needed to be heated to melt or extract some required materials, crucible is resistant to high temperature, corrosion and melting.

There are many kinds of crucible, such as clay crucible, graphite crucible and metal crucible. The graphite crucible can also be divided into general graphite crucible, special-shaped graphite crucible and high pure graphite crucible. Due to different types, the properties, USES and conditions of crucible are different, and the raw materials, production methods, technology and product models and specifications are also different.

In ancient times, people's production technology was limited, there was no such strong crucible at that time, in order to smelting metal, they dug a pit in the ground, made some hollow earth balls out of the earth, put the copper powder into the fire and burn, and finally pour out the molten copper water, this is the earliest crucible.

Next, let's talk about the graphite crucible. The main material of the graphite crucible is graphite, which can withstand the high temperature of 1200-1600 degrees Celsius, has very strong heat transfer performance, and can effectively reduce the melting time, reduce energy consumption and improve efficiency. Its chemical properties are relatively stable, it will not react with other metal solutions, in addition, its inner and outer walls are very smooth, no metal solution and residue left on the surface. However, in order to prevent oxidation, it is necessary to coat the surface of graphite crucible with anti-oxidation coating, so that the graphite crucible can not only resist high temperature but also extend its service life.

A lot of people might wonder why a crucible doesn't melt, because it's made up of multiple layers, the innermost layer is a heat shield, and it has a temperature barrier. When thousands of degrees of molten iron is in the crucible, it is blocked by the heat insulation layer and temperature insulation layer of the crucible, and the temperature of the outermost layer is only a few hundred degrees, which is far below the melting temperature of the metal, so it will not melt naturally.

And the crucible can withstand 1700 degrees Celsius, and it doesn't melt, and for ordinary metals it melts at a little over a thousand degrees, which is a lot lower than the melting point of a crucible, so it doesn't melt. However, as the crucible is eroded by high temperature for a long time, the wall of the crucible will become thinner and thinner, and finally it can only be scrapped.

With the development of our technology, we have all kinds of tools, and the crucible is one of the most powerful tools, and it has a wide range of USES.crucible.