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A high -intensity gray oxidant ceramic and its preparation method

A zirconia ceramic and high-strength technology, which is applied in the field of ceramics, can solve problems such as environmental hazards, toxic effects on the human body, and reduce the mechanical properties of ceramics, achieving low energy consumption, avoiding toxic effects, and excellent mechanical properties.

Active Publication Date: 2019-10-01
内蒙古晶陶锆业有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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  • A high -intensity gray oxidant ceramic and its preparation method
  • A high -intensity gray oxidant ceramic and its preparation method
  • A high -intensity gray oxidant ceramic and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Calculate with the total mass of zirconia and yttrium oxide as 1000 parts, accurately weigh 942 parts of zirconia, 58 parts of yttrium oxide, and 2 parts of polyammonium methacrylate as a dispersant, add deionized water, adjust the slurry content to 35%, and The material is introduced into a high-energy ball mill, and zirconia beads with a particle size of 0.6-0.8mm are used as grinding bodies for high-energy ball milling for 6 hours, and the ball milling speed is 2000 r / min;

[0026] Spray and dry the slurry after high-energy ball milling, adjust the atomization frequency to 45Hz, the air inlet temperature to 240°C, and the air outlet temperature to 90°C to obtain nano-ceramic powders with particle sizes below 100nm; for the prepared nano-ceramic powders Field emission scanning electron microscopy was carried out, and the test results were as follows: figure 1 shown by figure 1 It can be seen that the particle size of the ceramic powder prepared in this embodiment is ...

Embodiment 2

[0030] Based on the total mass of zirconia and yttrium oxide as 1000 parts, accurately weigh 945 parts of zirconia, 55 parts of yttrium oxide, 4 parts of dispersant ammonium polyacrylate, add deionized water, adjust the slurry content to 40%, and introduce the materials into High-energy ball mill, using zirconia beads with a particle size of 0.5-0.6mm as the grinding body, high-energy ball milling for 5 hours, and the ball milling speed is 2100 r / min;

[0031] The slurry after high-energy ball milling is directly dried in an electric oven at 90° C. for 12 hours to obtain nano-ceramic powder with a particle size of 100 nm or less.

[0032] The zirconia ceramic powder was preformed by a two-way ceramic hydraulic press at 8 MPa, and then further cold isostatic pressed at 180 MPa to form a ceramic green body, which was fired at 1400 ° C for 4 hours to obtain white zirconia ceramics.

[0033] Put the white zirconia ceramics in an atmosphere furnace, and bake them at 1350°C for 4 ho...

Embodiment 3

[0036] Calculate with the total mass of zirconia and yttrium oxide as 1000 parts, accurately weigh 948 parts of zirconia, 52 parts of yttrium oxide, 6 parts of dispersant sodium tripolyphosphate, add deionized water, adjust the slurry content to 45%, and mix the material Import a high-energy ball mill, use zirconia beads with a particle size of 0.4-0.5mm as the grinding body, high-energy ball mill for 4 hours, and the ball milling speed is 2200 r / min;

[0037] The slurry after high-energy ball milling is dried at 80° C. for 8 hours through an evaporator to obtain nano ceramic powder with a particle size of less than 100 nm.

[0038]The zirconia ceramic powder was preformed by a two-way ceramic hydraulic press at 10 MPa, and then further cold isostatic pressed at 200 MPa to form a ceramic green body, which was fired at 1450 ° C for 3 hours to obtain white zirconia ceramics.

[0039] Put the white zirconia ceramics in an atmosphere furnace, and bake them at 1400°C for 3 hours un...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/48C04B35/64
Inventor 张永和宋希文包金小郭文荣王思凯
Owner 内蒙古晶陶锆业有限公司
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