Black zirconia ceramic and preparation method thereof

Abstract

The invention discloses black zirconia ceramic material composition which comprises the following components in percentage by mass: 0-5% of ferric oxide, 0-5% of cobaltous oxide, 0-5% of chromic oxide, 0-5% of aluminum oxide, 0-5% of nickel oxide, 0-5% of manganese oxide, 0-5% of zinc oxide, 2-6% of yttrium oxide, 0-5% of titanium oxide, 0-5% of silicon dioxide, 0-5% of cerium oxide and the balance of zirconium oxide containing hafnium oxide. The black zirconia ceramic material composition disclosed by the invention is small in powder granularity and uniform in distribution, and black zirconia ceramic containing the black zirconia ceramic material composition is relatively good in covering power, high in blackness and relatively low in transmittance of light. Meanwhile the invention further discloses black zirconia ceramic prepared from the black zirconia ceramic material composition and a preparation method of the black zirconia ceramic.

Description

technical field [0001] The invention relates to a ceramic material and a preparation method thereof, in particular to a zirconia ceramic material and a preparation method thereof. Background technique [0002] Due to its excellent mechanical, thermal and electrical properties, zirconia is widely used in structural materials, optical components, oxygen sensitive components and fuel cells. In recent years, with the rapid development of people's demand for decorations, black zirconia ceramics have become a new favorite material for high-end decorations due to their excellent mechanical properties, bright colors, metallic luster and non-allergic effects. , mobile phone casings, etc. have broad market prospects. [0003] At present, the preparation of black zirconia ceramics mainly adopts the following two methods: 1. The zirconia ceramics are blackened in vacuum, reducing atmosphere or inert atmosphere to form oxygen vacancies, thereby forming point defects of color centers and...

AI Technical Summary

Problems solved by technology

When using a vacuum furnace, reducing atmosphere furnace or inert atmosphere furnace, it is necessary to sinter zirconia into porcelain in the air, and then blacken it in the above-mentioned sintering furnace, which greatly increases the cost of the production process. The products in the blackening process are prone to color difference due to the unevenness of the color center, resulting in a series of problems such as insufficient blackness of the product

However, when zirconia is doped with iron, cobalt, nickel and other pigment oxides, due to the inconsistent absorption wavelength of each oxide, it is easy to cause black and not black, and the color of the product appears reddish, bluish, greenish, etc.

And the added oxides are easy to react with yttrium and zirconium, destroying the stability of zirconia, and easily causing phase change and cracking of the product

In the preparation process, the requirements on the amount of colorant addition and temperature are relatively strict. Once the control is not good, problems such as color differences between batches are prone to occur.

[0004] It can be seen from the above that the existing black zirconia ceramics have disadvantages such as poor color uniformity, insufficient blackness, good light transmission, and insufficient color covering power.

Unable to meet the requirements of appearance components such as high blackness mobile phone board