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Preparation method of surface coated magnesia crucible

A surface coating and magnesium oxide technology, applied in the field of crucible preparation, can solve the problems of affecting the performance of alloys, short service life, low production efficiency, etc., and achieve the effects of prolonging service life, strong corrosion resistance and reducing loss

Inactive Publication Date: 2018-09-18
肃北镁弘科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing formed crucible material contains a small amount of impurities, which affects the properties of the alloy
After the crucible is used for a long time, there will be tiny cracks, which cannot be repaired, and the service life is short, so it can only be replaced frequently, resulting in high melting costs and low production efficiency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: Preparation of a surface-coated magnesia crucible

[0021] (1) Select fused magnesia with a particle size formula of 2-1 mm 20%, 1-0.5 mm 10%, and ≤0.5 mm 70% as raw materials, and add a binder with a weight percentage of 4% after mixing evenly. Hold the pressure at 180 MPa for 20 minutes for isostatic pressing to obtain a green body, place the green body at 110°C for 12 hours and then place it in a sintering furnace for heat treatment and sintering at 1750°C for 2 hours. A magnesium oxide crucible is obtained; wherein, the binder is at least one of sodium carboxymethylcellulose (CMC), polyvinyl butyral (PVB), sodium silicate and magnesium sulfate; the sintering furnace is a box furnace, a tube Any one of high-temperature furnaces such as type furnace, muffle furnace, atmosphere furnace, well type furnace, program-controlled furnace, etc.;

[0022] (2) After the above-mentioned magnesia crucible is cooled, use the dipping method to coat the magnesia cruci...

Embodiment 2

[0023] Embodiment 2: Preparation of a surface-coated magnesia crucible

[0024] (1) Select fused magnesia with a particle size formula of 2-1 mm 30%, 1-0.5 mm 25%, and ≤0.5 mm 45% as raw materials, and add a binder with a weight percentage of 4.5% after mixing evenly. Hold the pressure at 210 MPa for 15 minutes for isostatic pressing to obtain a green body, place the green body at 110°C for 12 hours, and then place it in a sintering furnace for heat treatment and sintering at 1775°C for 2 hours. A magnesium oxide crucible is obtained; wherein, the binder is at least one of sodium carboxymethylcellulose (CMC), polyvinyl butyral (PVB), sodium silicate and magnesium sulfate; the sintering furnace is a box furnace, a tube Any one of high-temperature furnaces such as type furnace, muffle furnace, atmosphere furnace, well type furnace, program-controlled furnace, etc.;

[0025] (2) After the above-mentioned magnesia crucible is cooled, use the dipping method to coat the magnesia cr...

Embodiment 3

[0026] Embodiment 3: Preparation of a surface-coated magnesia crucible

[0027] (1) Select fused magnesia with a particle size formula of 2-1 mm 40%, 1-0.5 mm 40%, and ≤0.5 mm 20% as raw materials, and add a binder with a weight percentage of 5% and mix evenly. Hold the pressure at 240 MPa for 10 minutes for isostatic pressing to obtain a green body, place the green body at 110°C for 12 hours and then place it in a sintering furnace for heat treatment and sintering at 1800°C for 2 hours. A magnesium oxide crucible is obtained; wherein, the binder is at least one of sodium carboxymethylcellulose (CMC), polyvinyl butyral (PVB), sodium silicate and magnesium sulfate; the sintering furnace is a box furnace, a tube Any one of high-temperature furnaces such as type furnace, muffle furnace, atmosphere furnace, well type furnace, program-controlled furnace, etc.;

[0028] (2) After the above-mentioned magnesia crucible is cooled, use the dipping method to coat the magnesia crucible w...

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Abstract

The invention discloses a preparation method of a surface coated magnesia crucible. The preparation method comprises the following steps: (1) selecting electrically-fused magnesia with a certain granule formula as a raw material, adding a binding agent and uniformly mixing, performing isostatic pressing, drying a green body, placing in a sintering furnace for heat treatment sintering, thereby obtaining the magnesia crucible after finishing the sintering; and (2) performing alumina sol coating on the magnesia crucible by adopting an impregnation method, drying after finishing coating, placing in the sintering furnace for vacuum pumping for gas exhaust, performing heat treatment sintering after exhausting gas, thereby obtaining the surface coated magnesia crucible after finishing the sintering. After the magnesia crucible is obtained through sintering, a layer of alumina sol coats the surface of the magnesia crucible by adopting the impregnation method for sintering again, so that a firmprotection layer is formed on the surface of the magnesia crucible by alumina sol, high purity, high strength and extremely high corrosion resistance are realized, the loss of the crucible in the useprocess is effectively reduced, and the service life is prolonged.

Description

technical field [0001] The invention relates to the technical field of crucible preparation, in particular to a method for preparing a surface-coated magnesia crucible. Background technique [0002] The crucible is indispensable in the smelting process of precious metals. In the smelting process of precious metals, the crucible is required to meet the requirements of smelting and prevent the elements in the crucible from polluting the precious metals during the smelting process. The existing formed crucible material contains a small amount of impurities, which affects the properties of the alloy. After the crucible is used for a long time, there will be tiny cracks, which cannot be repaired, and the service life is short, so it can only be replaced frequently, resulting in high melting costs and low production efficiency. [0003] Magnesium oxide ceramics have high melting point, low density, and excellent corrosion resistance to alkali metals. The melting point of pure ma...

Claims

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Application Information

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IPC IPC(8): C04B35/043C04B35/66C04B35/622C04B41/87
CPCC04B35/043C04B35/622C04B41/009C04B41/5031C04B41/87
Inventor 董波
Owner 肃北镁弘科技有限公司