Homepage

7 Grades of Alumina Ceramics

Alumina, also referred to as aluminum oxide, is among the most well-known kinds of ceramic oxide. Alumina is a versatile material that is suitable for various purposes due to its distinct set of properties. It is the material of choice to cut tools, abrasion resistant tiles, spark plugs, and other components. When you expect to find out details about ceramic tube, you have to look at Sunditools site.

But, there’s not only one kind of alumina ceramic that is the best choice for all its uses. To ensure that their customers get the correct component Alumina injection molding firms use a variety of alumina ceramics. It is crucial to be aware of these grades.

What are the various types of alumina ceramics?

Based on the requirements of your part or component requires, you may choose any of the commercial grade of alumina currently available.

Smelter grade

Smelter grade or metallurgical Alumina is the kind of alumina that is used to manufacture aluminum metal. It is produced from aluminum hydroxide, either in fluid flash calciners and in fluid beds. In addition to slowly reducing the surface of alumina the fluid flash process removes any chemically mixed or free water.

Alumina is then subjected to extremely high temperatures as well as calcination in order to become the form. The form is typically a specific surface area of 50m2/g.

Low soda

The low levels of aluminum oxide are necessary for many specific applications that require alumina parts and components. This includes electronics and electrical industries. Low soda is typically defined as a component with a soda content that is less than 0.1% of its weight. This can be achieved using a variety of methods like acid washing, boron or chlor addition, among other methods.

Reactive

The term “reactive aluminum” refers to the type of technical ceramic that features a relatively high degree of purity and tiny sizes of crystals. Typically, it is 1um which sinters and forms an extremely dense structure with lower temperatures in comparison to ordinary-soda, medium-soda, and low-soda alumina. This kind of aluminum oxide is a great option for applications that require high chemical inertness and resistance to temperature wear resistance, as well as durability.

Tabular

It is a sintered or recrystallized a-alumina with a morphology which is composed of large, flat-shaped corundum crystals that have sizes of 50 to 500um. It is formed by the process of extruding, pressing, or pelletizing calcined alumina into various shapes prior to heating them to temperatures below their melting point within shaft kilns, approximately to 1800?.

Following the process of calcination, the alumina spheres that have been sintered are suitable for different applications, including the use in catalyst beds or you can grind, screen, and crush them into different sizes based on your needs.

Fused

This type of alumina is created when a current flows through different vertical carbon electrodes. The generated heat then melts the aluminum oxide and creates the material that has high refractoriness, low porosity, low permeability, and high density, which is suitable to be used in refractories and abrasives.

High purity

High-purity Alumina is a substance with a purity of at minimum 99.9 percent. It is made by experts by using Bayer hydrate. They will require washing and activating the material several times , or make use of chloride to attain the desired purity. Highest-purity aluminas are made either using aluminum metal or the calcination of ammonium aluminum sulfate.