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Tetragonal-phase nano-composite zirconia powder and preparation method thereof and sintered body

A nano-composite, zirconia powder technology, applied in the field of ceramic materials, can solve the problems of insufficient flexibility of chemical co-precipitation method, poor color repeatability, and difficulty in changing production lines.

Active Publication Date: 2021-07-06
WANHUA CHEM GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The color zirconia powder obtained by mixing the colorant with zirconia powder by means of solid-phase mechanical mixing (ball milling, stirring, etc.) is usually difficult to disperse the colorant uniformly in the ceramic matrix, and the batch stability is poor. It will lead to problems such as uneven coloring, poor color repeatability, and colorant volatilization at high temperatures after the colored zirconia powder is formed and sintered.
Although the colored zirconia powder prepared by the chemical precipitation method can solve the problem of uneven coloring to a certain extent, due to the high requirements for color diversity and selectivity in the fields of craft decoration, jewelry, and mobile phone backplanes, so The chemical co-precipitation method has problems such as insufficient flexibility, difficulty in changing production lines, and substantial increase in equipment costs.

Method used

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  • Tetragonal-phase nano-composite zirconia powder and preparation method thereof and sintered body
  • Tetragonal-phase nano-composite zirconia powder and preparation method thereof and sintered body
  • Tetragonal-phase nano-composite zirconia powder and preparation method thereof and sintered body

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-5

[0082] Example 1-5 (i.e. S1-5) prepares tetragonal phase nanocomposite zirconia powder

Embodiment 1

[0083] Embodiment 1 (ie S1)

[0084] (1) Co-precipitation

[0085] Weigh zirconium oxychloride octahydrate ZrOCl respectively 2 ·8H 2 O 161.12g, erbium nitrate pentahydrate Er (NO 3 ) 3 ·5H 2 O2.22g, cerium nitrate hexahydrate Ce(NO 3 ) 3 ·6H 2 O 27.41g, praseodymium nitrate hexahydrate Pr(NO 3 ) 3 ·6H 2 O 10.88g, dissolved in 500g deionized water to prepare a saline solution; then weigh ammonium bicarbonate NH 4 HCO 3 120g, dissolved in 700g deionized water to prepare lye; use a peristaltic pump to feed, and use the bottom feeding method at room temperature to carry out coprecipitation reaction, control the pH of the system during the coprecipitation reaction process to 4.5, and obtain the precursor slurry ;

[0086] (2) washing

[0087] The precursor slurry obtained in step (1) was suction-filtered and washed with deionized water at 50° C. to obtain a filter cake; the volume ratio of the deionized water used to the precursor slurry was 0.75:1,

[0088] (3) dr...

Embodiment 2-5

[0093] Embodiment 2-5 (being S2-5)

[0094] Tetragonal phase nanocomposite zirconia powder A2-5 was prepared according to the method of Example 1. The raw materials and amounts used are shown in Table 1, the conditions of each step are shown in Table 2, and the relevant parameters of the product are shown in Table 3.

[0095] Raw materials and dosage used in Table 1 S1-5

[0096]

[0097]

[0098] Conditions of each step in Table 2 S1-5

[0099]

[0100] Table 3 Relevant parameters of each product in S1-5

[0101]

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PUM

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Abstract

The invention provides tetragonal-phase nano-composite zirconia powder and a preparation method thereof, a sintered body and a preparation method and application of the sintered body. The chemical general formula of the tetragonal-phase nano-composite zirconia powder is ZrEraCebPrcOd, wherein a is more than or equal to 0.005 and less than or equal to 0.1, b is more than or equal to 0.01 and less than or equal to 0.15, c is more than or equal to 0 and less than or equal to 0.08, and d is equal to (4+3a+4b+3c) / 2. The preparation method sequentially comprises the steps of coprecipitation, water washing, drying and roasting, wherein the preparation process is simple, mild, green and environmentally friendly. The preparation method of the sintered body comprises the following steps: preparing tetragonal-phase nano-composite zirconia powder into a pre-sintered body, and sintering the pre-sintered body in a reducing mixed gas containing H2 and N2, wherein in the sintered body, the molar ratio of Ce<3+> to Ce<4+> is (0.05-20):1. According to the invention, the sintered body is high in density and not easy to age at low temperature, the color can be regulated and controlled through a sintering process, and the application range is wide.

Description

technical field [0001] The invention belongs to the technical field of ceramic materials, and in particular relates to tetragonal nanocomposite zirconia powder, a preparation method thereof and a sintered body. Background technique [0002] Zirconia ceramic is a new high-tech ceramic with low shielding, high strength, wear resistance, high temperature resistance and corrosion resistance. It has good communication performance and can be used to produce optical fiber connector components for communication; it has high strength and a Mohs hardness of about 8.5, which is similar to sapphire hardness, and can be used to manufacture dentures, cutting tools, golf club heads, and simulated gemstones; its chemical The stability is also very good, and it has a wide range of applications in the field of high-temperature insulation and sealing devices; in addition, it has sensitive characteristics and can be used to produce fuel cell diaphragms, oxygen sensors, etc. The cubic phase of ...

Claims

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Application Information

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IPC IPC(8): C04B35/488C04B35/50C04B35/626C04B35/64
CPCC04B35/488C04B35/50C04B35/62605C04B35/64C04B2235/77C04B2235/444C04B2235/443C04B2235/449C04B2235/448C04B2235/442C04B2235/6582Y02E60/50
Inventor 周英浩陈潇吴桢孙家宽
Owner WANHUA CHEM GRP
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