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Method for preparing high-density magnesia ceramic

A technology of magnesium oxide and magnesium oxide powder, applied in the application field of structural ceramics, can solve the problems of low purity and density, small sintering shrinkage, long period of wax removal, etc., to shorten the production cycle, improve the density, and eliminate the softness. the effect of reunion

Inactive Publication Date: 2011-05-18
沈阳临德陶瓷研发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Taking magnesia ceramic crucibles as an example, at present, most of them use fused magnesia as raw material, and the grouting molding process is used to produce crucibles. The purity and density of the products are relatively low, which cannot meet the requirements of smelting high-purity non-ferrous metals, high-temperature alloys and radioactive alloys. The requirements of isostatic pressing are high in quality, small in firing shrinkage, dense in body, not easy to deform, but low in efficiency; hot die casting is easy to operate, high in dimensional accuracy, high in production efficiency, but has a long period of wax removal , the yield is also low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment 1: the preparation of magnesia crucible

[0036] The raw material is magnesium oxide powder with a purity of 99.5%, and an average particle size of 2 microns. Prepare 1000ml premixed solution, the mass ratio is: 10% acrylamide; 1% N,N'-methylenebisacrylamide; 2% polyacrylamide; 87% deionized water.

[0037] Prepare a slurry with a mass solid content of 80%, and ball mill and mix for 2 hours.

[0038] The catalyst tetramethylethylenediamine and the initiator ammonium persulfate were respectively added in an amount of 0.2% of the above slurry, then vacuum stirred and degassed for 15 minutes, then poured into a mold, and kept at 80° C. for 30 minutes. The mold is placed at room temperature, and after the mold is cooled, the mold is demolded to obtain a magnesia crucible green body.

[0039] Put the green body in a constant temperature and humidity box with a humidity of 90%, until the green body no longer shrinks, then transfer it to an oven, and dry it in the...

Embodiment 2

[0040] Embodiment 2: the preparation of magnesia thermocouple protective casing

[0041] The raw materials and steps are the same as in Example 1, the mass solid content of the slurry is 85%, the sintering temperature is 1700° C., and the sintering time is 4 hours. The volume density of the finally obtained magnesia thermocouple protection sleeve is 3.56 g / cm 3 , The apparent porosity is 0.1%.

Embodiment 3

[0042] Example 3 Preparation of Magnesium Oxide Target

[0043] The raw material adopts high-purity nano-magnesia powder, the purity is greater than 99.9%, and the average particle size is 12 nanometers. The implementation steps are the same as in Example 1. The mass solid content of the slurry is 80%, the sintering temperature is 1600 ° C, and the sintering time is 1 hour. The bulk density of the finally obtained magnesium oxide thermocouple protection sleeve is 3.57g / cm 3。

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Abstract

The invention discloses a method for preparing high-density magnesia ceramic, and belongs to the technical field of structural ceramic application. A gel injection molding process is adopted. The method comprises the following steps of: preparing monomer solution for gel injection molding, adding pre-sintered high-purity magnesia ceramic powder into the monomer solution, and uniformly mixing to obtain stable slurry; adding a catalyst and an initiator, performing vacuum degassing, pouring the ceramic slurry into a die, and completely reacting a monomer with a cross-linking agent at an appropriate temperature to obtain a ceramic biscuit; and drying and sintering the biscuit to a magnesia ceramic product. The magnesia ceramic prepared by the method has the advantages of high mechanical strength, purity, density and thermal shock resistance and the like; meanwhile, the shape and size of the magnesia ceramic product can be controlled by the die; and a novel low-cost method for quickly and efficiently producing the high-density magnesia ceramic in batches is provided.

Description

technical field [0001] The invention relates to a method for preparing high-density magnesia ceramics, which belongs to the technical field of structural ceramic applications. Background technique [0002] High-purity, high-density magnesium oxide has excellent acid and alkali resistance and electrical insulation at high temperatures, good light transmission and high thermal conductivity. It can work stably up to 2400°C under the protection of oxidizing atmosphere or nitrogen, and metals such as Fe, Zn, Pb, Cu, Mn cannot reduce it. MgO ceramics can be used as crucibles for smelting metals, and are also suitable for smelting high-purity uranium and thorium in the atomic energy industry; they can also be used as thermocouple protection sleeves. Utilizing its property of allowing electromagnetic waves to pass through, it can be used as a transmission window material for radome and infrared radiation. [0003] At present, there are many magnesium oxide ceramic products in the ...

Claims

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Application Information

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IPC IPC(8): C04B35/01C04B35/622
Inventor 骆兵韩绍娟许壮志薛健张明吴学坤
Owner 沈阳临德陶瓷研发有限公司
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