Dry-pressing preparation method of magnesium oxide ceramics

A technology of magnesia and ceramics, which is applied in the field of metallurgy, can solve the problems of tedious operation and high production cost of magnesia ceramics, and achieve the effect of reducing production links, good compactness and high density

Inactive Publication Date: 2017-11-24
盐城市华康电热绝缘材料厂
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is: the existing method prepares magnesia ceramics with lengthy operation and high production cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0017] The invention provides a method for preparing magnesium oxide ceramics by dry pressing, comprising the following steps:

[0018] a. Magnesium oxide powder is subjected to magnetic separation through an electromagnetic magnetic separator, and ball milled into 350-400 mesh powder after magnetic separation; the magnetic field strength is 0.5-2T during the magnetic separation;

[0019] b. Use the airflow granulation method to granulate the magnesium oxide powder; when granulating, control the vacuum degree of the granulator to 0.1-0.3pa, and the air flow rate to be 3-5L / min;

[0020] c. The granulated magnesium oxide particles are pressed into a semi-finished product with a powder press machine; the pressing temperature is 20-60°C, the pressing pressure is 0.1-2Mpa, and the pressing time is 10-30min;

[0021] d. Put the semi-finished product obtained in step c into a sintering furnace for sintering, and obtain magnesium oxide ceramics after sintering; the sintering temperat...

Embodiment 1

[0027] Example 1 Preparation of magnesia ceramics by the method of the present invention

[0028] The specific operation steps are as follows:

[0029] a, magnesium oxide powder is carried out magnetic separation through electromagnetic magnetic separator, after magnetic separation, ball milling becomes 350 mesh powder; Magnetic field intensity is 0.5T during described magnetic separation;

[0030] b. Use the airflow granulation method to granulate the magnesium oxide powder; when granulating, control the vacuum degree of the granulator to 0.1pa, and the air flow rate to be 3L / min;

[0031] c. The granulated magnesium oxide particles are pressed into a semi-finished product using a powder compactor; the pressing temperature is 20°C, the pressing pressure is 0.1Mpa, and the pressing time is 10min;

[0032] d. Put the semi-finished product obtained in step c into a sintering furnace for sintering, and obtain magnesium oxide ceramic 1 after sintering; the sintering temperature i...

Embodiment 2

[0033] Example 2 Preparation of magnesia ceramics by the method of the present invention

[0034] The specific operation steps are as follows:

[0035] a, magnesium oxide powder is carried out magnetic separation through electromagnetic magnetic separator, and after magnetic separation, ball mills into 400 mesh powder; Magnetic field strength is 2T during described magnetic separation;

[0036] B. Use the airflow granulation method to granulate the magnesium oxide powder; when granulating, control the vacuum degree of the granulator to 0.3pa, and the air flow rate is 5L / min;

[0037] c. The granulated magnesium oxide particles are pressed into a semi-finished product using a powder compactor; the pressing temperature is 60°C, the pressing pressure is 2Mpa, and the pressing time is 30min;

[0038] d. Put the semi-finished product obtained in step c into a sintering furnace for sintering, and obtain magnesium oxide ceramic 2 after sintering; the sintering temperature is 1300° C...

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Abstract

The invention belongs to the technical field of metallurgy, and particularly relates to a dry-pressing preparation method of magnesium oxide ceramics. In view of problems of tedious operations and high production costs of an existing preparation method of magnesium oxide ceramics, the invention provides the dry-pressing preparation method of magnesium oxide ceramics, wherein the dry-pressing preparation method comprises the following steps: a, magnetically separating magnesium oxide powder by an electromagnetic separator, ball-milling into a certain degree of fineness after magnetic separation; b, using an airflow granulation method for granulating the magnesium oxide powder; c, pressing the magnesium oxide particles after granulation by a powder pressing machine to form a semi-finished product; and d, placing the semi-finished product obtained in the step c into a sintering furnace for sintering, and obtaining the magnesium oxide ceramics after finishing sintering. The dry-pressing preparation method provided by the invention obtains the semi-finished product with relatively high density by controlling pressing conditions, prepares the magnesium oxide ceramics with high density and hardness and good compactness by controlling sintering conditions, has few production steps and low production costs, and is a simple method for preparing magnesium oxide ceramics.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a dry pressing preparation method of magnesium oxide ceramics. Background technique [0002] Magnesium oxide ceramics belong to the cubic crystal system, with a melting point of about 2800 ° C, a Mohs hardness of 5-6, a high specific volume resistance at high temperatures, and good insulation. The high temperature stability and corrosion resistance of magnesia ceramics are better than those of alumina ceramics, and can be used in the corrosive environment of strong alkali metals. For example, it is applied to the high-temperature sintering of Beta alumina (β˝-Al2O3) solid ceramic electrolyte tube of sodium-sulfur battery. It is resistant to alkaline corrosion at high temperature and has a long service life. It can effectively compensate for the high-temperature conventional refractory materials such as corundum in some harsh high-temperature environments. Insuffic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/04C04B35/622C04B35/626
CPCC04B35/04C04B35/622C04B35/62605C04B35/62695
Inventor 王康王益华
Owner 盐城市华康电热绝缘材料厂
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