Preparation method of compact magnesia ceramics by sintering

A technology of magnesium oxide and nano-magnesium oxide powder, applied in the field of electronic materials, can solve the problems of inconvenient mass production and high production cost

Inactive Publication Date: 2011-01-19
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, such methods are not convenient for industrial mass production, and the production cost is high. How to realize pressureless sintering to prepare high-density magnesia ceramics is becoming the focus of increasing attention.

Method used

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  • Preparation method of compact magnesia ceramics by sintering
  • Preparation method of compact magnesia ceramics by sintering
  • Preparation method of compact magnesia ceramics by sintering

Examples

Experimental program
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Embodiment 1

[0019] In this example, basic magnesium carbonate is used as a raw material and calcined at 700°C to obtain magnesium oxide nanopowder, which is then pressurized and formed under a pressure of 800 MPa to obtain a magnesium oxide ceramic green body, and then the green body is heated at a rate of 10°C / min. rate, the temperature was raised to 1300°C, and the temperature was maintained for 180 minutes. Finally, a dense magnesia ceramic with a relative density of 98.2% is obtained.

Embodiment 2

[0021] The difference between this embodiment and Example 1 is that the molding pressure of the nano-magnesia powder is different. Basic magnesium carbonate is used as raw material and calcined at 700°C to obtain magnesium oxide nanopowder, and then pressurized at 320MPa, 480MPa, and 640MPa for 2 minutes to form different magnesium oxide ceramic green bodies. The heating rate is 10°C / min, the temperature is raised to 1300°C, and the temperature is kept for 180 minutes. Finally, magnesium oxide ceramics are obtained.

Embodiment 3

[0023] The difference between this embodiment and embodiment 1 is that the calcination temperature of basic magnesium carbonate is different. Basic magnesium carbonate is used as raw material to be calcined at 800°C, 900°C, and 1000°C to obtain magnesium oxide nano-powders with different particle sizes, and then pressurized at 800MPa to obtain magnesium oxide ceramic green body, and then the green body The billet was heated to 1300°C at a heating rate of 10°C / min and kept for 180 minutes. Finally, magnesium oxide ceramics are obtained.

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Abstract

The invention discloses a preparation method of compact magnesia ceramics by sintering, relating to an electronic material. The method comprises the following steps: A, taking sheet-like nano high-purity basic magnesium carbonate as a raw material, and carrying out high-temperature calcination on the raw material at 700-1000 DEG C to obtain nano magnesium oxide powder; B, carrying out pressure forming on the nano magnesium oxide powder obtained by calcination to obtain a magnesia ceramic blank; and C, heating the magnesia ceramic blank at a rate of 1 DEG C/min-30 DEG C/min to the preset sintering temperature, wherein the sintering temperature is 1300 DEG C, and the heat-preservation sintering time is 180 min. The invention adopts the appropriate forming pressure (800MPa) and the appropriate heating rate (10 DEG C/min) and utilizes a pressureless sintering method to prepare the compact magnesia ceramics the relative density of which is up to 98.2%.

Description

technical field [0001] The invention relates to electronic material technology. Background technique [0002] MgO belongs to the cubic sodium chloride structure, with a theoretical density of 3.58g / cm3 and a melting point of 2800°C. It has some special excellent properties such as good high temperature resistance and electrical insulation, such as strong resistance to metals and slag. It can be used as a container for smelting rare earth metals, zinc, copper, lead, platinum, cobalt and their alloys. Magnesium oxide can also be used as a casting mold for casting pure metals and as a crucible for melting gold-boron alloys in semiconductor processes. The characteristics of magnesia ceramics determine that its application is always related to high temperature environment. At present, dense magnesia ceramics are also widely used in electron beam evaporation magnesia targets for the preparation of magnesia thin films such as dielectric protective layer materials in PDP displays....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/04C04B35/64
Inventor 曹林洪智顺华王宁会
Owner SOUTHWEAT UNIV OF SCI & TECH
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