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Method used for preventing high temperature oxidation in magnesium fluoride hot processing, and applications thereof

A high-temperature oxidation and thermal processing technology, applied in magnesium fluoride, magnesium halide and other directions, to achieve the effect of no reduction in purity, low cost and simple operation

Active Publication Date: 2018-10-19
BAOJI UNIV OF ARTS & SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is for the existing MgF 2 Defects that are oxidized to MgO at high temperature, providing a method to prevent high temperature oxidation of magnesium fluoride during thermal processing

Method used

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  • Method used for preventing high temperature oxidation in magnesium fluoride hot processing, and applications thereof
  • Method used for preventing high temperature oxidation in magnesium fluoride hot processing, and applications thereof
  • Method used for preventing high temperature oxidation in magnesium fluoride hot processing, and applications thereof

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Effect test

Embodiment 1

[0030] In a tube furnace equipped with a gas supply system, 10g of powdered MgF with a purity of 99.9% is placed 2 The corundum crucible, then pass into SF 6 / Air mixed gas, the mixed gas flow is 300mL / min, where SF 6 Account for 1% of the volume of the mixed gas, the tube furnace is gradually heated to 1000°C for 2 hours, and then the MgF 2 Cool to room temperature, for powder MgF 2 XRD pattern analysis was performed, and the presence of MgO was not detected (see figure 1 ).

Embodiment 2

[0032] In a tube furnace equipped with a gas supply system, 10g of powdered MgF with a purity of 99.9% is placed 2 Corundum crucible, and then pass tetrafluoroethane (molecular formula CF 3 CH 2 F) / air mixed gas, the mixed gas flow rate is 300mL / min, in which tetrafluoroethane accounts for 1% of the mixed gas volume, the tube furnace is gradually heated to 1000°C, kept for 2 hours, and then MgF 2 Cool to room temperature, for powder MgF 2 XRD pattern analysis was performed, and the presence of MgO was not detected (see figure 2 ).

Embodiment 3

[0034] In a tube furnace equipped with a gas supply system, 10g of powdered MgF with a purity of 99.9% is placed 2 Corundum crucible, and then pass hexafluoropropylene (molecular formula C 3 F 6 ) / Air mixed gas, the mixed gas flow rate is 300mL / min, of which hexafluoropropylene accounts for 1% of the mixed gas volume. The tube furnace is gradually heated to 1000°C and kept for 2 hours, then the MgF 2 Cool to room temperature, for powder MgF 2 XRD pattern analysis was performed, and the presence of MgO was not detected (see image 3 ).

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Abstract

The invention discloses a method used for preventing high temperature oxidation in magnesium fluoride hot processing, and applications thereof. The method comprises following steps: before hot processing, a mixed gas is adopted to protect the magnesium fluoride raw material, and the mixed gas is introduced into processing equipment continuously in hot processing process for protection; the mixed gas contains a fluorine containing gas with a volume fraction of 1 to 5%, and the fluorine containing gas is one or a mixture of two or more kinds of gas selected from sulfur hexafluoride, tetrafluoroethane, and hexafluoropropene. The hot processing temperature is controlled to be 600 to 1100 DEG C. The method is capable of ensuring that oxidation of MgF2 in high temperature processing and application process is avoided, MgF2 application range is widened, operation of the method is simple, efficiency is high, cost is low, and industrialized applications are realized.

Description

Technical field [0001] The invention belongs to the technical field of magnesium fluoride application, and specifically relates to a method and application for preventing high-temperature oxidation of magnesium fluoride during thermal processing. Background technique [0002] Magnesium fluoride (MgF 2 ) Is an important electronic ceramic material. Because of its good insulating properties, it is more and more popular in the development of cermet materials. MgF 2 It is also an optical coating material with excellent performance. It has excellent properties such as wide transparent band, low refractive index, wide energy gap, high mechanical strength of the film and high laser damage threshold. It is used to prepare antireflection coatings, high reflective coatings, and high damage The material of choice for threshold films. [0003] Generally believed that MgF 2 It is a stable ionic compound that will not decompose under normal circumstances, nor will it be transformed into other c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/28
CPCC01F5/28C01P2002/72
Inventor 陈虎魁介洋洋常利
Owner BAOJI UNIV OF ARTS & SCI