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Method for preparing submicron order rare-earth zirconate ceramic bulk material

A sub-micron, zirconate technology, applied in the preparation of sub-micron rare earth zirconate ceramic bulk materials, in the field of preparation of rare earth zirconate ceramic bulk materials, can solve the problem of grain growth and inability to form nanometer Ceramic blocks and other problems, to achieve the effect of short heating time, short preparation cycle and low sintering temperature

Active Publication Date: 2017-08-11
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is a more efficient way to study the relationship between grain size, thermal conductivity and fracture toughness by using rare earth zirconate ceramic blocks. With longer sintering time, the crystal grains inevitably grow up, and it is impossible to form a denser nano-ceramic block

Method used

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  • Method for preparing submicron order rare-earth zirconate ceramic bulk material
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  • Method for preparing submicron order rare-earth zirconate ceramic bulk material

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Submicron Sm 2 Zr 2 o 7 Preparation of ceramic bulk materials:

[0030] (1) 1000g ZrOCl 2 ·8H 2 O dissolved in 950 mL deionized water, 540 g Sm 2 o 3 Dissolve in 3000mL of dilute nitric acid with a mass fraction of 30%, then mix the aqueous solution of zirconium oxychloride with the nitric acid solution of samarium oxide to obtain a mixed solution; then add the mixed solution dropwise to 2000mL of ammonia water with a mass fraction of 17%. Chemical co-precipitation reaction, and the pH of the reaction system is 10 after the reaction is completed, the precipitate produced by the reaction is washed, filtered and dried in an oven to obtain the precursor powder;

[0031] (2) Place the obtained precursor powder in a planetary ball mill with a ball-to-material ratio of 4:1. After ball milling at 300r / min for 20 minutes, the ball-milled powder is passed through a test sieve to obtain a particle size of 20 μm to 80 μm. The powder; then calcined the powder at 1250 °C for ...

Embodiment 2

[0036] Submicron La 2 Zr 2 o 7 Preparation of ceramic bulk materials:

[0037] (1) 1000g ZrOCl 2 ·8H 2 O was dissolved in 950mL deionized water, 505g La 2 o 3 Dissolve in 3200mL of dilute nitric acid with a mass fraction of 30%, then mix the aqueous solution of zirconium oxychloride with the nitric acid solution of lanthanum oxide to obtain a mixed solution; then add the mixed solution dropwise to 2100mL of ammonia water with a mass fraction of 17%. Chemical co-precipitation reaction, and the pH of the reaction system is 10.7 after the reaction is completed, the precipitate produced by the reaction is washed, filtered and dried in an oven to obtain the precursor powder;

[0038] (2) Place the obtained precursor powder in a planetary ball mill with a ball-to-material ratio of 4:1. After ball milling at 400r / min for 10 minutes, the ball-milled powder is passed through a test sieve to obtain a particle size of It is a powder of 20 μm to 80 μm; then the powder is calcined a...

Embodiment 3

[0043] Submicron Gd 2 Zr 2 o 7 Preparation of ceramic bulk materials:

[0044] (1) 1000g ZrOCl 2 ·8H 2 O dissolved in 950 mL deionized water, 580 g Gd 2 o 3 Dissolve in 3400mL of dilute nitric acid with a mass fraction of 30%, then mix the aqueous solution of zirconium oxychloride with the nitric acid solution of gadolinium oxide to obtain a mixed solution; then add the mixed solution dropwise to 2400mL of ammonia water with a mass fraction of 17%. Chemical co-precipitation reaction, and the pH of the reaction system is 10.3 after the reaction is completed, the precipitate produced by the reaction is washed, filtered and dried in an oven to obtain the precursor powder;

[0045] (2) Place the obtained precursor powder in a planetary ball mill with a ball-to-material ratio of 4:1. After ball milling at 300r / min for 20 minutes, the ball-milled powder is passed through a test sieve to obtain a particle size of 20 μm to 80 μm. The powder; then calcined the powder at 1150°C f...

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Abstract

The invention relates to a method for preparing a submicron order rare-earth zirconate ceramic bulk material and belongs to the technical field of inorganic nonmetallic materials. The method comprises the following steps: carrying out a chemical coprecipitation reaction between a nitric acid solution of rare-earth oxides and an aqueous solution of zirconium oxychloride in excessive ammonia water so as to obtain precursor powder; and performing precalcination on the obtained precursor powder, and sintering by utilizing a spark plasma sintering technology, thereby obtaining the rare-earth zirconate ceramic bulk material. According to the method disclosed by the invention, grain growth is inhibited by utilizing the advantages that the spark plasma sintering technology is low in sintering temperature and short in heating time, and the density reaches 92% or higher; and moreover, the method is simple in process and short in preparation cycle, sintering aids are not added, and the high-purity phase ceramic material can be obtained.

Description

technical field [0001] The invention relates to a preparation method of a rare earth zirconate ceramic bulk material, in particular to a preparation method of a submicron rare earth zirconate ceramic bulk material, and belongs to the technical field of inorganic non-metallic materials. Background technique [0002] With the development of aviation gas turbines in the direction of high flow ratio, high thrust-to-weight ratio, and high inlet temperature, the temperature and pressure of the gas in the combustion chamber continue to increase, and the existing high-temperature alloys and cooling technologies are difficult to meet the needs. Therefore, the high-temperature structural material technology alone cannot meet the urgent requirements of the rapid development of advanced aero-engines. [0003] Studies have shown that adding a thermal barrier coating with a thickness of 100 μm to 500 μm and good performance on the surface of the superalloy can reduce the surface of the su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/48C04B35/64
CPCC04B35/48C04B35/64C04B2235/3224C04B2235/3227C04B2235/5436C04B2235/666C04B2235/785
Inventor 郭巍刘玲马壮
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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