A high -intensity gray oxidant ceramic and its preparation method

Abstract

The invention discloses a high strength grey zirconia ceramic and a preparation method thereof. The method includes: conducting high energy ball milling treatment on a mixed slurry containing zirconia, yttrium oxide, a dispersant and deionized water; then performing drying treatment on the slurry subjected to high energy ball milling to obtain zirconia nano-powder; then molding the zirconia nano-powder and conducting high temperature sintering to obtain white zirconia ceramic; and finally, placing the white zirconia ceramic under a hydrogen reduction atmosphere in an atmosphere furnace for high temperature sintering, thus obtaining the grey zirconia ceramic. The preparation process is simple and convenient, and the energy consumption and cost are low. At the same time, the preparation process of the grey zirconia ceramic has no need for introducing volatile Cr, Co, Mn and other transition metal colorants, solves the problem of uneven color distribution of ceramics caused by easy high temperature decomposition and volatilization of colorants, and avoids the toxic effect of parts of coloring ions on the human body and the defect that the doping of parts of transitional metal colorants can reduce the mechanical properties of ceramics.

Description

technical field [0001] The invention relates to the technical field of ceramics, in particular to a high-strength gray zirconia ceramic and a preparation method thereof. Background technique [0002] Due to its excellent thermal properties, mechanical properties and chemical stability, zirconia ceramics are widely used in aerospace materials, biological materials, refractory materials and decorative materials, marine equipment and other fields, especially in the field of marine equipment, such as the preparation of ship-borne Screws for large-scale equipment such as machines and ships have higher requirements for strength. [0003] In recent years, the requirements for the color, brightness, and performance of colored zirconia ceramics have been continuously improved, and the preparation of gray zirconia ceramics with excellent performance has become a hot and difficult point. At present, the industry mainly prepares colored zirconia ceramics by adding transition metal oxid...

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Problems solved by technology

[0004] The application number is CN201710357961.1 for the preparation of blue ceramics and the application number CN201710358402.2 for the preparation of black ceramics, in which Cr, Co, Mn and other transition metal colorants are mixed with volatility, and the colorants are easy to decompose and volatilize at high temperature, resulting in ceramic color The distribution is uneven, and some coloring ions are toxic to the human body. The doping of transition metal colorants such as iron oxide will also reduce the mechanical properties of ceramics, especially for decorative ceramics that directly contact the human body (bracelets, buttons, mobile phone backplanes) etc.) cannot use this method to prepare colored ceramics; in addition, the strength of some of the current preparation methods for colored ceramics can only reach between 850-1000Mpa, and the performance is far from meeting the requirements of marine equipment, aviation materials and other fields

In addition, for the chemical co-precipitation preparation process, the chemical co-precipitation preparation process will introduce a large amount of acid ions, which will not only cause environmental harm when washing the acid ions, but also increase energy consumption and preparation costs. Does not meet the development requirements of future new material preparation technology

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