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Preparation method of black zirconia ceramic

The technology of black zirconia and ceramics is applied in the field of preparation of black zirconia ceramics, which can solve the problems of high production cost and complicated preparation process, and achieve the effects of low equipment investment and production cost, simple process method and low dosage.

Active Publication Date: 2017-03-15
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the above-mentioned documents, the black toner has a spinel crystal structure. In addition to the above-mentioned disadvantages, there are also problems of complicated preparation process and high production cost.

Method used

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  • Preparation method of black zirconia ceramic
  • Preparation method of black zirconia ceramic

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1.1g of lanthanum oxide, 0.25g of calcium oxide, 0.25g of chromium oxide and 0.4g of alumina were wet-ground to a particle size of less than 1μm and mixed uniformly. Then the slurry was dried and calcined in a muffle furnace at 1200°C. After hours, grind and crush to obtain black toner (La0.6Ca0.4Al0.7Cr0.3O3); mix the above-mentioned black toner (the black toner accounts for 2.5% of the mass fraction of zirconia powder) with 78g of zirconia powder by ball milling, Press molding and sintering at 1450°C for 2 hours to obtain black zirconia ceramics.

[0021] See figure 1 It can be seen from the figure that the prepared black zirconia ceramic has no residual pores, and the added black toner particles are evenly distributed in the zirconia matrix. The prepared black zirconia ceramic has good mechanical properties and black chromaticity, the density is 6.02g / cm3, the bending strength is 970MPa, the chromaticity value L=45, a=-0.08, b=-0.21.

Embodiment 2

[0023] The black toner synthesized in Example 1 (the black toner accounts for 2.5% of the mass fraction of the zirconia powder) is uniformly mixed with 78g zirconia powder by ball milling, pressed into a shape, and calcined at 1450°C for 1 hour to obtain a black zirconia ceramic . The prepared black zirconia ceramic has a density of 6.00g / cm3, a bending strength of 930MPa, a chromaticity value of L=38, a=-0.60, and b=-0.25.

Embodiment 3

[0025] 1.06g of lanthanum oxide, 0.24g of calcium oxide, 0.41g of chromium oxide and 0.28g of alumina were wet-milled and mixed uniformly, then the slurry was dried, calcined in a muffle furnace at 1050°C for 1 hour, and ground and crushed to obtain a black (La0.6Ca0.4Al0.5Cr0.503); mix 64.3g of zirconia powder with the synthesized black toner (black toner accounts for 3% of the zirconia powder mass fraction) by ball milling, press and shape, and calcinate at 1500℃ In 2 hours, black zirconia ceramics were obtained. The prepared black zirconia ceramic has a density of 6.02g / cm3, a bending strength of 900MPa, a chromaticity value of L=36, a=+0.10, b=-0.20.

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Abstract

The invention discloses a preparation method of a black zirconia ceramic. The preparation method solves the problem that a black pigment of the existing black zirconia ceramic has poor high temperature performances so that performances of a black zirconia ceramic fished product are reduced. The preparation method comprises grinding the black pigment and zirconia powder as raw materials, mixing the powder, molding the mixed powder, and carrying out calcining to obtain the black zirconia ceramic. The black pigment is prepared from lanthanum oxide, calcium oxide, chromium oxide and alumina through grinding, mixing, calcining and crushing. A mole ratio of lanthanum oxide, calcium oxide, chromium oxide to alumina is (1-x): x: (1-y): y, wherein x is greater than 0 and less than or equal to 0.4 and y is greater than 0 and less than or equal to 0.5. The preparation method has the advantages of simple process, low production cost and environmental friendliness. The black zirconia ceramic has excellent performances such as high temperature performances.

Description

Technical field [0001] The invention relates to the field of high-temperature structural ceramics, in particular to a method for preparing black zirconia ceramics. Background technique [0002] Zirconia ceramics can effectively improve the brittleness of ceramics through its unique "phase change toughening" mechanism, so it has been widely used in many fields. In recent years, especially in decorative materials, electronic consumer products and wearable device shell materials, applications have developed rapidly . As a decoration and shell, the material is required to be color-fast, non-fading, scratch-resistant, and drop-resistant, and it needs to have a high-end visual appearance and sense of use. Black is a commonly used color for decorative materials. Black, with the texture and metallic luster of zirconia ceramics, is low-key and luxurious. It not only meets the inherent performance requirements of decorative materials, but also greatly enhances its appearance. However, bl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/48C04B35/622
Inventor 熊焰杜凯旋王千瑞王玲
Owner HUBEI UNIV OF TECH
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