A kind of method and application of preventing high temperature oxidation during hot working of magnesium fluoride

A high-temperature oxidation and thermal processing technology, applied in the direction of magnesium fluoride, magnesium halide, etc.

Active Publication Date: 2020-10-27
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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  • A kind of method and application of preventing high temperature oxidation during hot working of magnesium fluoride
  • A kind of method and application of preventing high temperature oxidation during hot working of magnesium fluoride
  • A kind of method and application of preventing high temperature oxidation during hot working of magnesium fluoride

Examples

Experimental program
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Effect test

Embodiment 1

[0030] In a tube furnace equipped with a gas supply system, put 10g of powdered MgF with a purity of 99.9% 2 corundum crucible, and then into the SF 6 / air mixed gas, the mixed gas flow rate is 300mL / min, of which SF 6 Accounting for 1% of the volume of the mixed gas, the temperature of the tube furnace was gradually raised to 1000 ° C, and the temperature was kept for 2 hours, and then the MgF 2 cooled to room temperature, the powdered MgF 2 Carry out XRD pattern analysis, do not detect the existence of MgO (see figure 1 ).

Embodiment 2

[0032] In a tube furnace equipped with a gas supply system, put 10g of powdered MgF with a purity of 99.9% 2 corundum crucible, and then into tetrafluoroethane (molecular formula CF 3 CH 2 F) / air mixed gas, the mixed gas flow rate is 300mL / min, wherein tetrafluoroethane accounts for 1% of the mixed gas volume, the tube furnace is gradually heated to 1000 ° C, kept for 2 hours, and then the MgF 2 cooled to room temperature, the powdered MgF 2 Carry out XRD pattern analysis, do not detect the existence of MgO (see figure 2 ).

Embodiment 3

[0034] In a tube furnace equipped with a gas supply system, put 10g of powdered MgF with a purity of 99.9% 2 corundum crucible, and then into hexafluoropropylene (molecular formula C 3 f 6 ) / air mixed gas, the mixed gas flow rate is 300mL / min, in which hexafluoropropylene accounts for 1% of the mixed gas volume, the tube furnace is gradually heated to 1000 ° C, kept for 2 hours, and then the MgF 2 cooled to room temperature, the powdered MgF 2 Carry out XRD pattern analysis, do not detect the existence of MgO (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 in particular relates to a method for preventing high-temperature oxidation of magnesium fluoride during thermal processing and its application. Background technique [0002] Magnesium fluoride (MgF 2 ) is an important electronic ceramic material. Due to 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 layer and high laser damage threshold. The material of choice for threshold films. [0003] It is generally believed that MgF 2 It is a stable ionic compound that does not decompose or transform into other compounds under normal circumstances. However, studies have found that when impurities are involved, MgF 2 ...

Claims

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Application Information

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