Black zirconium oxide ceramic and preparation method thereof

Abstract

The invention provides a black zirconium oxide ceramic and a preparation method thereof. The preparation method comprises the following steps: sanding mixed slurry containing oxide, a dispersant and water to obtain sanded slurry, mixing the sanded slurry with a bonding agent, and sequentially granulating, moulding, debinding and sintering to obtain a primary ceramic, and then performing a reduction reaction on the primary ceramic at 1350-1550 DEG C to obtain the black zirconium oxide ceramic. With the preparation method, the particle sizes of raw materials are reduced by adopting a sanding technology, so that the mass transfer distance between particles is shortened and the mixing uniformity between the raw materials is improved; the dense primary ceramic is obtained through granulation and sintering, and the chemical valence of titanium is changed in the reduction reaction of the primary ceramic, so that the transition track of electrons changes therewith, an absorbed band changes correspondingly, and thus the white ceramic becomes a black ceramic. Results of the embodiments show that the black zirconium oxide ceramic has the blackness value of 110-200 and uniform color distribution.

Description

technical field [0001] The invention relates to the technical field of ceramics, in particular to a black zirconia ceramic and a preparation method thereof. Background technique [0002] ZrO 2 Ceramics have the characteristics of low thermal conductivity, low thermal expansion coefficient, high chemical stability, excellent mechanical properties, and good corrosion resistance, making them not only a research hotspot in the field of scientific research, but also widely used in various fields of industry and life, such as oxidation Zirconium grinding body, ceramic cutting tool, dental material, refractory material, oxygen sensor, instrumentation and high-grade decorative ceramic parts, etc. [0003] With the improvement of people's living standards, the requirements for colored zirconia high-grade decorative ceramics are also increasing, such as color, gloss, brightness, etc. At present, black ceramics are hot spots and difficulties in colored ceramics, and are mostly prepar...

AI Technical Summary

Problems solved by technology

For example, the Chinese patent CN201710158058.2 and the Chinese patent CN201610853884.4 both adopt the method of adding colored pigments. Although black zirconia can be obtained, there is inevitably a certain degree of zirconia in the process of mixing the white base material and the black pigment. Inhomogeneity, resulting in uneven color of black ceramics

In addition, the inconsistent thermal expansion between the white base material and the black coloring material will lead to a serious decline in the mechanical properties of the entire black ceramic

[0005] Although there is no mixing process in the carburizing coloring method, due to the limitation of the development level of the carburizing process, it is still difficult to ensure the uniform and uniform color of the surface and interior of the prepared black ceramics

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