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Method for preparing transparent yttrium oxide ceramic component through two-step pressure sintering

A two-step pressurization, yttrium oxide technology, applied in the direction of yttrium oxide/yttrium hydroxide, rare earth metal oxide/hydroxide, etc., can solve the problems of slow heating rate, low sintering efficiency, easy cracking, etc., and achieve excellent performance , The effect of good density and fast preparation speed

Active Publication Date: 2016-07-20
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These traditional sintering methods have disadvantages such as slow heating rate, low sintering efficiency, high energy consumption, high temperature for ceramics to achieve densification, easy cracking, and many defects.

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A method for preparing transparent yttrium oxide ceramic parts by two-step pressure sintering, comprising the steps of:

[0032] (1) Synthesis of ceramic powder: adopt reverse co-precipitation method to prepare high-purity ultrafine yttrium oxide nano-ceramic powder, the purity of high-purity ultra-fine yttrium oxide nano-ceramic powder is greater than 99.9%, and the average particle size is 80~200nm, and the preferred average particle size is 90nm;

[0033] (2) Sintering of transparent yttrium oxide ceramics: using a two-step pressurized spark plasma sintering process to prepare yttrium oxide nano-transparent ceramics;

[0034] (3) Post-processing: After spark plasma sintering, the sample is taken out for annealing and ground and polished to obtain the final finished transparent yttrium oxide ceramic part.

[0035] The method for preparing transparent yttrium oxide ceramic parts by two-step pressure sintering of the present invention pre-prepares nano-yttrium oxide po...

Embodiment 2

[0039] A method for preparing transparent yttrium oxide ceramic parts by two-step pressure sintering is carried out through the following steps.

[0040] (1) Synthesis of ceramic powder: adopt reverse co-precipitation method to prepare high-purity ultrafine yttrium oxide nano-ceramic powder, the purity of the high-purity ultra-fine yttrium oxide nano-ceramic powder described in the present invention is greater than 99.9%, and the average particle diameter is 80~200nm , the preferred average particle size is 90nm.

[0041] The synthesis of step (1) ceramic powder comprises the following steps:

[0042] (1.1) Take yttrium oxide raw material, dissolve with concentrated nitric acid, be mixed with the yttrium nitrate solution that concentration is 0.2-0.8mol / L;

[0043] (1.2) Add the yttrium nitrate solution dropwise to the ammonium bicarbonate solution with a concentration of 2 to 3 mol / L at a titration rate of less than 5ml / min by reverse titration, and simultaneously use a magn...

Embodiment 3

[0057] A method for preparing transparent yttrium oxide ceramic parts by two-step pressure sintering, other features are the same as in embodiment 2, the difference is: the two-step pressure spark plasma sintering process of step (2), its sintering system is: In the low temperature stage from room temperature to 1000°C, sintering under the condition of a pressure of 10MPa to relieve the inhibition of high pressure on grain slippage, promote the slippage of grains and eliminate open pores; in the high temperature stage from 1000°C to 1450°C, in Sintering under the condition of pressure of 100MPa to achieve high densification of ceramics.

[0058] The method of the invention has the characteristics of fast heating speed and low energy consumption, and the crystal grain size of the prepared transparent yttrium oxide ceramic part is nano-scale, and the grain size is uniform. The transparent yttrium oxide ceramic part has good compactness and excellent performance, its strength is ...

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Abstract

A method for preparing a transparent yttrium oxide ceramic component through two-step pressure sintering comprises the following steps that firstly, ceramic powder is synthesized, wherein high-purity superfine yttrium oxide nanometer ceramic powder is prepared with a reverse coprecipitation method; secondly, transparent yttrium oxide ceramic is sintered, wherein the transparent yttrium nanometer oxide ceramic is prepared with a two-step pressurized spark plasma sintering technology; thirdly, aftertreatment is carried out, wherein after spark plasma sintering, a sample is taken out for annealing and grinding polishing, and the final finished product, namely, the transparent yttrium oxide ceramic component, is obtained.According to the method for preparing the transparent yttrium oxide ceramic component through two-step pressure sintering, the nanometer yttrium oxide powder with a small particle size and uniform distribution is prepared in advance with the reverse coprecipitation method, and then the transparent yttrium oxide ceramic component good in compactness, uniform in particle size and good in performance is prepared with the two-step pressurized spark plasma sintering technology.The strength of the prepared transparent yttrium oxide ceramic component is higher than 400 MPa, and the transparence is higher than 60%.

Description

technical field [0001] The invention relates to the technical field of preparation of transparent yttrium oxide ceramics, in particular to a method for preparing transparent yttrium oxide ceramic parts by two-step pressure sintering. Background technique [0002] Transparent ceramic materials are a new generation of inorganic non-metallic materials that are of great strategic significance to national security and the sustainable development of the national economy. It is of great and far-reaching significance to study the basic scientific issues of ceramics and to expand its application fields. [0003] Among many transparent ceramic materials, yttrium oxide transparent ceramics have attracted widespread attention due to their excellent properties. Yttrium oxide is a cubic crystal with optical isotropy, which makes it have excellent light transmission properties. Yttrium oxide transparent ceramics were first made by the General Electric Company of the United States in the ...

Claims

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Application Information

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IPC IPC(8): C04B35/505C04B35/645C01F17/218
CPCC04B35/505C04B35/645C04B2235/9653C04B2235/666C04B2235/662C01F17/218C04B2235/5454C04B2235/661C04B2235/6562C04B2235/6565C04B2235/96C01P2004/61
Inventor 刘伟陈健伍海东白帅星伍尚华
Owner GUANGDONG UNIV OF TECH
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