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The difference between alumina and high temperature alumina | Alloy Wiki
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The difference between alumina and high temperature alumina

Posted by: steel world 2021-11-06 Comments Off on The difference between alumina and high temperature alumina
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The difference between alumina and high temperature alumina


Generally speaking, high-temperature alumina is still used in the market. For example, many low-temperature manufacturers add other substances to it, but the difference between it and alumina depends on its characteristics.

Generally speaking, high-temperature alumina is still used in the market. For example, many low-temperature manufacturers add other substances to it, but the difference between it and alumina depends on its characteristics.
High temperature alumina can withstand high temperatures:
1. γ-type alumina is produced by dehydration of Aluminum hydroxide at a low temperature of 140-150°C. It is also called activated alumina and aluminum glue in industry.
2. γ-Al2O3 can be transformed into α-Al2O3 (corundum) at 950～1200℃, and significant volume shrinkage occurs at the same time.
3. The melting point of α-Al2O3 is 2000±15℃.
Alumina has a melting point of more than 2000 degrees. It is a white solid that is difficult to dissolve in water. It is odorless, hard in texture, easy to absorb moisture but not deliquescent. It is an amphoteric oxide and can be dissolved in inorganic acids and alkaline solutions, almost insoluble It is suitable for water and non-polar organic solvents. Because of its high temperature resistance, it can be used as a refractory material.
High-temperature alumina is alumina calcined at a high temperature, which is generally α-type crystal, resistant to acid and alkali corrosion, and has high strength. Alpha alumina is generally used as a sealant filler. The main component of corundum that we are familiar with is α-Al2O3, which can be used as bearings for precision instruments, such as diamonds, grinding wheels, and polishing agents for clocks and watches.
Judging from the properties of the two, there is still a basic difference between high-temperature alumina and alumina. One is suitable for refractory materials, and the other is harder and can be used for durable materials, so that it can be used in different fields. Play their respective roles.

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