As an important part of chemical equipment, the crucible is a container for heating and melting, analyzing and testing various materials, and is the basis for ensuring the smooth progress of chemical reactions. It can also be used for smelting metals, precious metals, optical glass, analyzing and firing rare earth, and other mineral raw materials, and firing high-temperature products such as ceramic powders.
There are many types of crucibles. According to different raw materials, ceramic crucibles can be divided into boron nitride crucibles, alumina crucibles, zirconium oxide crucibles, aluminum nitride crucibles, quartz crucibles, etc. Here we mainly introduce the difference between boron nitride crucibles and alumina crucibles.
The advantages of boron nitride ceramic crucibles over alumina crucibles are:
1. High temperature. The long-term use temperature of boron nitride in vacuum is 1800 degrees, and the long-term use temperature under inert gas protection is 2100 degrees. The maximum use temperature of the alumina crucible does not exceed 1700 degrees.
2. Strong thermal shock resistance, rapid cooling, and no cracking. Take the boron nitride ceramic out of the 1000-degree furnace, cool it quickly with a blower, and it will not break even after 100 times of repeated use.
3. It is resistant to acid and alkali corrosion, has strong electrical insulation, and can resist electrical breakdown 3 to 4 times that of alumina.
4. Boron nitride ceramics do not react with many metals, ceramics, rare earths, and other substances. Such as ferrous metals, iron, copper, stainless steel, tantalum, aluminum, tin, chromium, lead, nickel, magnesium, etc., glass melts, sodium glass, cryolite, etc., silicon lava: slag, fluoride, etc. It can be used as containers, enamels, burners, etc.
The disadvantages of boron nitride ceramic crucibles compared with alumina ceramic crucibles are:
1. The strength, hardness, and wear resistance of boron nitride ceramics are lower than those of alumina, and it is not suitable for use in vibration and friction environments.
2. The maximum temperature of boron nitride ceramics in the air does not exceed 1000 degrees, otherwise it is easy to oxidize. Boron nitride can only be used to 2100 degrees under inert gas protection.
Edgetech specializes in the manufacture and sale of advanced ceramic parts. We provide customized production and high-precision processing for a variety of high-performance ceramic materials, including alumina ceramics, zirconium oxide ceramics, silicon nitride, silicon carbide, boron nitride, aluminum nitride, etc. Our ceramic parts can be found in many industries, such as machinery, chemistry, medicine, semiconductors, vehicles, electronics, metallurgy, etc.