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Rapid preparation method of gadolinium zirconate ceramics

A technology of gadolinium zirconate and ceramics, which is applied in the field of rapid preparation of gadolinium zirconate ceramics, can solve the problems of low density of sintered samples, secondary pollution, long sintering time, etc., achieve good industrial application prospects, fast heating speed, The effect of short sintering time

Inactive Publication Date: 2016-11-16
SOUTHWEAT UNIV OF SCI & TECH
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Problems solved by technology

[0005] Aiming at the technical defects of the existing preparation method of gadolinium zirconate ceramics, such as long sintering time, low density of sintered samples, easy to produce secondary pollution, etc., the present invention provides a method using gadolinium oxide and zirconium oxide as raw materials and adopting spark plasma sintering. Method for quickly and efficiently preparing gadolinium zirconate ceramics with device

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  • Rapid preparation method of gadolinium zirconate ceramics
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  • Rapid preparation method of gadolinium zirconate ceramics

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Embodiment 1

[0028] A rapid preparation method of gadolinium zirconate ceramics, comprising the following steps:

[0029] ① Fully mix gadolinia and zirconia powder raw materials at a molar ratio of 1:2 (the purity of gadolinia and zirconia is above 98%), and then fully grind them into mixture particles with a particle size of 150 mesh (0.1mm ).

[0030] ② A layer of carbon paper is added to a graphite abrasive tool with a diameter of 15 mm, and then the mixture particles are put into a graphite mold 4 and pre-pressed under a pressure of 10 MPa.

[0031] ③Put the graphite mold containing the mixture particles into the spark plasma sintering device, connect the DC voltage, and vacuumize for 15 minutes (the general pressure is 10-20Pa), and heat it from room temperature 28°C to 1700°C at a heating rate of 100°C / min , and then kept at 1700°C for 5 minutes, and finally turned off the power, cooled to room temperature naturally, and took out the sample. After the reaction, put the obtained gad...

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Abstract

The invention discloses a rapid preparation method of gadolinium zirconate ceramics, and belongs to the field of chemical synthesis. The method disclosed by the invention comprises the following steps of mixing gadolinium oxide powder with zirconium oxide power, performing sufficient grinding to obtain mixture granules, applying a direct current pulse voltage to the mixture granules, and enabling the mixture granules to be subjected to a solid phase reaction, wherein after the reaction is completed, the gadolinium zirconate ceramics are obtained. The method disclosed by the invention has the characteristics of being high in temperature-rising rate, short in sintering time, simple in technological process, energy-saving, environmentally friendly, safe, reliable and the like. The samples of the prepared gadolinium zirconate ceramics are in single phases, and the gadolinium zirconate ceramics are high in crystallinity, high in density, clear in grain boundary, plump in crystal grains, and free from holes.

Description

technical field [0001] The invention relates to the field of chemical synthesis, in particular to a rapid preparation method of gadolinium zirconate ceramics. Background technique [0002] As the only energy that can replace fossil fuels in large quantities, nuclear energy is playing an increasingly obvious role in solving energy problems, but at the same time it will inevitably produce a large amount of radioactive waste. How to safely and effectively dispose of radioactive waste has become the biggest problem in nuclear waste disposal. [0003] In the 1980s, it was discovered that gadolinium zirconate ceramics in artificial rocks have the characteristics of high density, good radiation resistance, strong leaching resistance, strong chemical stability, and good tolerance. Gadolinium zirconate is a class of minerals in mineralogy, and its general chemical expression is A 2 B 2 o 7 , where the A site and the B site can accommodate radioactive nucleocords of different valen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/48C04B35/622C04B35/64
CPCC04B35/48C04B35/622C04B35/64C04B2235/666C04B2235/96
Inventor 卢喜瑞舒小艳王兰宋绵新毛雪丽
Owner SOUTHWEAT UNIV OF SCI & TECH
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