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Process of growing magnesium oxide crystal by magnesite

A technology of magnesite ore and magnesium oxide, which is applied in the field of crystal growth science and material science, can solve the problems of performance and function degradation, and achieve the effects of easy mastery, stable process and simple growth method

Inactive Publication Date: 2006-07-19
LIAONING ZHONGDA SUPERCONDUCTING MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Magnesium oxide crystals grown with seawater magnesium as raw materials have been applied in some high-tech fields, but magnesium oxide crystals grown with seawater magnesium often contain halogen elements such as sodium and potassium, and the color is yellowish, greenish or blue, etc. , its performance and functionality are also greatly reduced

Method used

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  • Process of growing magnesium oxide crystal by magnesite
  • Process of growing magnesium oxide crystal by magnesite
  • Process of growing magnesium oxide crystal by magnesite

Examples

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Effect test

Embodiment 1

[0010] Firstly, magnesite ore is roasted to produce three kinds of light-burned magnesia raw materials: Type A raw material has MgO content of 96.3%, particle size ≤3mm; Type B raw material has MgO content of 98.5%, particle size is 25mm; Type C raw material has MgO content of 97.1%, particle size is 35mm, The above three raw materials are mixed according to A: B: C = 1.5: 1: 3 (weight ratio) and 5000kg is taken, put into a cold crucible furnace body, heated by a three-phase alternating current electric melting method, and heated at a rate of 30° C. / min to 2100°C, heat up to 3000°C at a rate of 8°C / min, hold the temperature for 2.5 hours, raise the electrode at a speed of 9mm / h for 11 hours, hold the temperature for 2 hours, then cool down at a rate of 6°C / min, down to 2700°C, hold the temperature for 3 hours, Cool down at a rate of 3.5°C / min to 2450°C and keep the temperature constant for 1 hour; cool down at a rate of 3°C / min to 2100°C and hold the temperature for 1 hour; the...

Embodiment 2

[0012] Firstly, magnesite ore is roasted to produce three kinds of light-burned magnesia raw materials: Type A raw material with MgO content of 96.7%, particle size ≤3mm; Type B raw material with MgO content of 98.7%, particle size of 20mm; Type C raw material with MgO content of 97.5%, particle size of 30mm, The above three raw materials are mixed according to A: B: C = 1.5: 1: 3 (weight ratio) and 8000kg is taken, put into a cold crucible furnace body, heated by a three-phase alternating current electric melting method, and heated at a rate of 35°C / min to 2100°C, heat up to 3000°C at a rate of 10°C / min, hold the temperature for 5 hours, raise the electrode at a speed of 7mm / h for 13 hours, hold the temperature for 3 hours, then cool down at a rate of 5°C / min, down to 2700°C, hold the temperature for 3 hours, Cool down at a rate of 3.5°C / min to 2450°C and keep the temperature constant for 2 hours; cool down at a rate of 3°C / min to 2100°C and hold the temperature for 3 hours; t...

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Abstract

The invention relates to a crystal growth science and technique, especially a method of growing magnesia crystal by magnesite. It is using magnesite as raw material, using a cold pot as a furnace body, firstly baking the magnesite, respectively making three kinds of light-burned magnesia and mixing the three in proportion, placing the mixture in the furnace body, adopting three-phase AC electric melting process to heat, control the curves of increasing temperature, constant temperature and lowering temperature, and obtaining a sparkling and crystal-clear graceful cubic magnesia crystal.

Description

technical field [0001] The invention belongs to the field of material science and technology, and relates to crystal growth science and technology, in particular to a method for growing magnesium oxide crystals with magnesite ore. Background technique [0002] Magnesium oxide crystals have been applied to many high-tech fields, such as thin-film growth substrates for high-temperature superconducting devices, substrates for semiconductor materials, protective films for plasma displays, high-temperature and high-precision optical materials, and high-temperature crucible materials. In the field of high-temperature superconductivity, magnesium oxide crystals have obvious price advantages compared with other materials (such as gallium arsenide, diamond, white sapphire, etc.) as thin film growth substrates and substrates of semiconductor materials. Other materials are about four times lower and perform better. At present, many countries in the world (France, Germany, the United S...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B29/16C30B11/02C01F5/02
Inventor 王宁会黄耀戚栋范卫东吴彦
Owner LIAONING ZHONGDA SUPERCONDUCTING MATERIAL
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