What Are Alumina Boats Crucible? Properties And ApplicationsJanuary 10, 2023
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The alumina boat crucible acts as a container or tool to perform various chemical research and development processes. The Alumina boat is an elongated cubical, primarily rectangular in looks. The alumina boat is made of porous fused alumina and is robust and resistant to melting. It is an amazing ceramic material for high-temperature applications that require contamination-free outcomes. It comes with various capacities depending upon the requirements of the experiments. The crucibles and their lids comprise materials that can withstand high temperatures and ensure that your experiments are successful. Alumina boat crucibles are made of high-quality alumina, making them highly durable and perfect for all lab metal and nonmetal samples for analysis and glass melting. These crucibles have a maximum working temperature of 1800°C, making them perfect for even the most extreme experiments. Plus, they’re easy to clean, making them ideal for frequent use.
Alumina Crucible is used in industry to produce ferromagnetic materials such as stainless steel and nickel alloys. These metals are brittle under standard conditions; however, they become more ductile when melted and cooled slowly. Alumina Crucible is needed to produce these metals in a molten state. The name “alumina” is derived from aluminum oxide, an oxide of aluminum with the chemical formula Al 2 O 3. To understand it better, let us look at some properties and applications of the Alumina Crucible.
What are the properties of alumina crucibles?
The essential properties of an alumina crucible are as follows:
1. Lower melting point – Alumina is usually used for its low melting point rather than its chemical properties. It melts at about 2000 °C (3600 °F), which is much lower than the melting points of the common materials used for crucibles, such as graphite or molybdenum.
2. High thermal conductivity – Alumina has a very high thermal conductivity of about 3000 W/m·K, which is five times higher than iron or graphite. This makes it easier to handle and requires less energy to heat the crucible.
3. High strength – Alumina is harder than iron or graphite. So, it can withstand higher internal pressure due to the higher thermal expansion coefficient.
Alumina Crucible in industries and applications
Crucible is the container in which the chemical reaction is carried out. Different types of crucibles are used in industries for different types of chemical reactions. Some of the common ones are molybdenum, graphite, and alumina. Alumina is used in the production of alloys. It is also used for producing stainless steel and nickel alloys and in the casting and molding processes.
Thermal Expansion – Alumina has a very high thermal expansion, so it is used in places where thermal expansion is important.
Benefits of using alumina crucible
1. High strength – Alumina is harder than iron or graphite. So, it can withstand higher internal pressure due to the higher thermal expansion coefficient.
2. Thermal resistance – Alumina has a very high thermal conductivity of about 3000 W/m·K, five times higher than iron or graphite. This makes it easier to handle and requires less energy to heat the crucible.
3. Thermal Shock resistance – Alumina is a poor conductor of electricity. This makes it resistant to electrical hazards such as electrostatic discharge.
Disadvantages of using alumina crucible
Alumina has some disadvantages too. They are:
1. High cost – The cost of the alumina crucible is high compared to the other types of crucibles.
2. Low melting point – The low melting point of the alumina can cause the alloy to be contaminated with alumina.
3. Low thermal conductivity – The thermal conductivity of the alumina is lower than the other types of crucibles.
How to know if a particular chemical reaction is an alumina one?
If the chemical reaction produces ferromagnetic materials such as stainless steel and nickel alloys, then it is an alumina reaction.
Alumina Crucible Chemical Reaction is necessary to produce some metals such as stainless steel and nickel alloys. Alumina is used for this reaction because of its low melting point. It has some disadvantages, too, but it is still the best choice for this chemical reaction.
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