7 Different Grades of Alumina Ceramics

Alumina, also known as aluminum oxide, is among the most well-known ceramic oxide types. Alumina is a versatile material that can be used for various purposes due to its unique set of characteristics. It is the most preferred material to cut tools, abrasion-resistant tiles, spark plugs and other parts. To learn more information on aluminum oxide, you've to browse our site.

However, there is not just a single type of alumina that's ideal for every application. In order to provide their customers with the correct component the companies that use alumina injection molding employ a variety of ceramics. It is crucial to be familiar with the different grades.

What are the various grades of Alumina ceramics?

Depending on the exact specifications your piece or component needs, the selection could be based upon one of the many commercial grades of alumina currently available:

Smelter grade

The smelter grade, or metallurgical grade, Alumina is the kind of alumina that is used to manufacture aluminum metal. It is made from aluminum hydroxide that is either used in calciners that use fluid flash or in fluid beds. The process of fluid flash first removes free water and chemically combined water from alumina before gradually decreasing the surface.

Then, alumina is subjected to extreme temperatures, and then calcination to transform into the a-form typically around 25% with a surface area of 50m2/g.

Low soda

A variety of specializations for components and parts which are made from aluminum oxide, most commonly in the electronic and electrical industries, require the presence of low soda levels in the aluminum oxide. Low soda is usually described as a material with a soda content that is less than 0.1 percent of its weight. It is feasible to attain this through various processes, such as boron and chlorine addition, acid washing, and others.

Reactive

The term "reactive alumina" is a reference to the kind of technical aluminum that has an extremely high level of purity as well as small amounts of crystals, usually 1um which sinters and forms an extremely dense structure with lower temperatures in comparison to normal-soda medium-soda and low-soda alumina. This kind of aluminum oxide is a great choice in applications which require high chemical inertness, resistance to temperature as well as wear resistance and durability.

Tabular

It is a sintered or recrystallized a-alumina. It is amorphous material consisting of large, flat-shaped corundum crystallines with sizes between 50 and 500um. This is made by calcined aluminum being extruded, and then pelletized or compressed into various shapes, before being heated to below its melting point in shaft ovens. It can be approximately 1800?.

After calcination the Sintered aluminaspheres are utilized for a variety of purposes, like catalyst beds. They can also be crushed, screen, and crush them according to your needs.

Fused

This kind of alumina is created when a current flows through various carbon electrodes in the vertical. The heat produced melts the aluminum oxide. It is suitable to be used as a refractory material or an abrasive.

High purity

High-purity Alumina is a material with a purity of at the minimum of 99.9%. Professionals can create it beginning with Bayer hydrate, followed by successive washings and activations, or with chloride until they attain the purity required. Aluminas that are of the highest quality are made of aluminum metal or by calcining ammonium aluminum sulfurate.