Tetragonal nanocomposite zirconia powder, its preparation method 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, volatilization of colorants, increased equipment cost, etc., achieves low equipment dependence, promotes sintering and densification, and promotes diffusion. The effect of mass transfer

Active Publication Date: 2022-07-12
WANHUA CHEM GRP CO LTD
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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 nanocomposite zirconia powder, its preparation method and sintered body
  • Tetragonal nanocomposite zirconia powder, its preparation method and sintered body
  • Tetragonal nanocomposite zirconia powder, its preparation method and sintered body

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-5

[0082] Embodiment 1-5 (namely S1-5) prepares tetragonal phase nanocomposite zirconia powder

Embodiment 1

[0083] Embodiment 1 (ie S1)

[0084] (1) Co-precipitation

[0085] Weigh the zirconium oxychloride octahydrate ZrOCl separately 2 ·8H 2 O 161.12g, Erbium nitrate pentahydrate Er (NO 3 ) 3 ·5H 2 O2.22g, Cerium nitrate hexahydrate (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 salt solution; then weigh ammonium bicarbonate NH 4 HCO 3 120g, dissolved in 700g deionized water to prepare lye; using peristaltic pump to feed, at room temperature, the co-precipitation reaction was carried out by means of bottom feeding, and the pH of the system during the co-precipitation reaction was controlled to be 4.5 to obtain a precursor slurry ;

[0086] (2) Washing with water

[0087] The precursor slurry obtained in step (1) is subjected to suction filtration and washing with deionized water at 50° C. to obtain a filter cake; the volume ratio of the deionized water used to the precursor slurry...

Embodiment 2-5

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

[0094] The 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] Table 1 Raw materials and dosages used in S1-5

[0096]

[0097]

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

[0099]

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

[0101]

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Abstract

The invention provides a tetragonal phase nano-composite zirconia powder, a preparation method thereof, a sintered body, and a preparation method and application of the sintered body. The general chemical formula of the tetragonal nanocomposite zirconia powder is ZrEr a Ce b Pr c O d , 0.005≤a≤0.1, 0.01≤b≤0.15, 0≤c≤0.08, d=(4+3a+4b+3c) / 2. The preparation method sequentially includes co-precipitation, water washing, drying and roasting, and the preparation process is simple, mild, and environmentally friendly. The preparation method of the sintered body is to make a tetragonal nanocomposite zirconia powder into a pre-sintered body, and then place the pre-sintered body in a sintered body containing H 2 and N 2 sintered in a reducing gas mixture. In its sintered body, Ce 3+ with Ce 4+ The molar ratio is (0.05-20):1. The sintered body has high density, is not easy to age at low temperature, and can control the color through the sintering process, and is widely used.

Description

technical field [0001] The invention belongs to the technical field of ceramic materials, and particularly relates to a tetragonal phase nanocomposite zirconia powder, a preparation method and a sintered body thereof. Background technique [0002] Zirconia ceramics is a new type of high-tech ceramics with low shielding, high strength, wear resistance, high temperature resistance and corrosion resistance. Its communication performance is good, and it can be used to produce optical fiber connector components for communication; its strength is high, its Mohs hardness is about 8.5, which is similar to that of sapphire, and it can be used to make dentures, cutting tools, golf club heads, simulated gemstones, etc.; 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 properties and can be used to produce fuel cell membranes, oxygen sensors, etc. The cubi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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 CO LTD
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