Preparation method of high-density magnesium oxide based ceramic

A magnesia-based and magnesia-based technology, which is applied in the field of preparation of high-density magnesia-based ceramics, can solve problems such as complex processes, coarse grains, and expensive equipment, and achieve simple operation methods, improved density, and improved density. effect of density

Inactive Publication Date: 2019-07-12
UNIV OF SCI & TECH LIAONING
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the annealing process, the sintered body is prone to sample cracking and grain coarsening, which will also prolong the production cycle of the product
During hot-press sintering, the powder is molded under one-way or two-way pressure, and uneven density distribution and even cracks are prone to occur during the sintering process.
At the same time, both hot pressing sintering and hot isostatic pressing sintering have the problems of expensive equipment, long preparation cycle, complicated process and incapable of mass production

Method used

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  • Preparation method of high-density magnesium oxide based ceramic
  • Preparation method of high-density magnesium oxide based ceramic
  • Preparation method of high-density magnesium oxide based ceramic

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Embodiment 1

[0031] A preparation method of high-density magnesium oxide-based ceramics, the specific steps are as follows:

[0032] 1) Powder making, coarse crushing of single crystal magnesia, and crushing the coarse crushed material on a vibrating mill. After grinding, the powder is passed through a 80-mesh sieve, and the material on the sieve continues to be finely ground, and finally a single crystal less than 80 mesh is obtained. Magnesium oxide powder.

[0033] 2) Co-precipitation, put the single crystal magnesium oxide powder into the MgCl-containing 2 In the ammonia-water mixture, MgCl 2 The ratio with ammonia water is that the molar ratio is 1:2, and the stirring intensity is 300 rev / min, until the reaction is finished and the precipitation is no longer produced, the precipitation reactant is coated on the surface of the single crystal magnesium oxide powder, and the mixture is filtered to obtain The filter residue was heated up to 99°C at 5°C / time in a rotary evaporator until ...

Embodiment 2

[0041] A preparation method of high-density magnesium oxide-based ceramics, the specific steps are as follows:

[0042] 1) Powder making, coarse crushing of single crystal magnesia, and crushing the coarse crushed material on a vibrating mill. After grinding, the powder is passed through a 80-mesh sieve, and the material on the sieve continues to be finely ground, and finally a single crystal less than 80 mesh is obtained. Magnesium oxide powder.

[0043] 2) Co-precipitation, put the single crystal magnesium oxide powder into the MgCl-containing 2 In the ammonia-water mixture, the stirring intensity is 350 rev / min, until the reaction is over and the precipitation is no longer produced, the MgCl 2 The ratio to ammonia water is 1:2.5 in molar ratio, the precipitated reactant is coated on the surface of single crystal magnesium oxide powder, the mixture is filtered, and the obtained filter residue is heated to 100°C at 8°C / time in the distillation equipment until All the liquid...

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Abstract

The invention relates to the field of preparation of magnesium oxide based ceramics, and in particular relates to a preparation method of a high-density magnesium oxide based ceramic under normal-pressure sintering. The method is characterized by comprising the following steps: nano magnesium oxide coats the surface of single-crystal magnesium oxide by means of coprecipitation, after compression molding is performed, primary sintering is performed, sol filling is performed, secondary sintering is performed, and therefore the high-density magnesium oxide based ceramic is formed. Compared with the prior art, the method provided by the invention has the following beneficial effects: 1) the method adopts a sol-filling manner to reduce porosity of the magnesium oxide based ceramic product by 8-30%, thereby effectively improving the density of the magnesium oxide based ceramic under the normal-pressure sintering; 2) secondary sintering facilitates molecular structure stability of the magnesium oxide based ceramic product, and facilitates further improving the density of the magnesium oxide based ceramic product, and the relative density can be improved to 95% or more; and 3) the operation method is simple, has stable effects, and can realize mass production of the high-quality magnesium oxide based ceramic product.

Description

technical field [0001] The invention relates to the field of preparation of magnesium oxide-based ceramics, in particular to a method for preparing high-density magnesium oxide-based ceramics under normal pressure sintering. Background technique [0002] The mechanical behavior of ceramic materials such as strength and toughness is highly sensitive to the microstructure, especially microscopic defects such as pores, resulting in its actual mechanical properties far lower than the theoretical strength. Therefore, to improve the strength and toughness of the material, it is necessary to reduce the porosity of the material as much as possible, and strive to increase the density of the material. At present, the methods for preparing high-density ceramics mainly include hot pressing sintering, hot isostatic pressing sintering and combination sintering of the above methods. [0003] The magnesium oxide sintered body obtained by hot pressing sintering or hot isostatic pressing sin...

Claims

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Application Information

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IPC IPC(8): C04B35/04C04B35/622C04B35/624
CPCC04B35/04C04B35/622C04B35/624C04B2235/602C04B2235/6567C04B2235/661
Inventor 罗旭东郎杰夫侯庆冬
Owner UNIV OF SCI & TECH LIAONING
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