Colored alumina ceramics are usually made by adding colored oxides to the raw materials of alumina ceramics to make the alumina ceramics show a specific color, so as to meet certain requirements for use.
Red-purple alumina ceramics
Red-purple alumina ceramics usually use MnO2 and Cr2O3 in the raw materials of alumina ceramics.
MnO-MgO-Al2O3-SiO2 alumina ceramics
When 3.3% MnCo3 is added to the raw material with 90% alumina content, the alumina ceramics fired in an oxidizing atmosphere will appear dark purple.
MnO-Cr2O3-Al2O3-SiO2 alumina ceramics
This alumina ceramic has high mechanical strength, the flexural strength reaches 400-540MPa, vacuum air tightness, and metallization strength is also higher than that of similar alumina ceramics, the only disadvantage is relatively high dielectric loss.
Black alumina ceramic
Semiconductor integrated circuits have obvious photosensitivity, and it is required that the alumina ceramics used as packaging packages should have light-shielding properties.
The alumina ceramic used for the lining of the digital tube is also required to be black to ensure clear digital display.
Fe-Cr-Co and Fe-Cr-Co-Mn are commonly used alumina ceramic black pigments, which usually exist in the state of spinel.
As alumina ceramics used in electronic technology, the selection of black colorants must consider other properties of ceramic materials, such as high resistivity.
Commonly used black alumina ceramic oxide colorants are Fe2O3, CoO, NiO, Cr2O3, MnO, TiO2, etc.
With the rapid development of integrated circuits, it is necessary to produce a large number of low-cost black alumina ceramic packages with light-shielding properties.
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