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Method for preparing calcium fluoride transparent ceramic by vacuum hot pressing sintering with lithium fluoride as auxiliary

A technology of vacuum hot pressing sintering and transparent ceramics, applied in the field of preparation of fluoride transparent ceramics, can solve the problems of opacity and low sintering activity of calcium fluoride ceramics, achieve good transparency and promote the effect of densification process

Inactive Publication Date: 2019-04-16
XINYANG NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the sintering activity of commercially available calcium fluoride powder is much lower than that of chemically synthesized powder, and the calcium fluoride ceramics prepared by vacuum hot pressing sintering are completely opaque (see literature W Li, H Huang, B Mei, et al.Comparison of commercial and synthesized CaF 2 powders for preparing transparent ceramics, Ceram. Int. 43 (2017) 10403-10409)

Method used

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  • Method for preparing calcium fluoride transparent ceramic by vacuum hot pressing sintering with lithium fluoride as auxiliary
  • Method for preparing calcium fluoride transparent ceramic by vacuum hot pressing sintering with lithium fluoride as auxiliary
  • Method for preparing calcium fluoride transparent ceramic by vacuum hot pressing sintering with lithium fluoride as auxiliary

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Experimental program
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Effect test

Embodiment 1

[0024] 1) Preparation of powder raw materials: Weigh 5g of commercially available calcium fluoride powder, add lithium fluoride powder to make the content of lithium fluoride 2.0wt%, add absolute ethanol to submerge the powder, and place in Ultrasonic treatment in an ultrasonic cleaner for 60 minutes, then fully mixed, and dried in an oven for later use;

[0025] 2) Sample loading: Weigh 2 g of the mixed powder obtained in step 1), put it into a graphite mold with an inner diameter of 16 mm, and separate the mold from the mixed powder with graphite paper;

[0026] 3) Sintering of transparent ceramics: put the filled graphite mold into a vacuum hot-press furnace, evacuate to better than 10Pa, heat up to 800°C, then apply a pressure of 30MPa, and keep warm for 3h;

[0027] 4) Treatment of transparent ceramics: After sintering, take out the ceramic samples, firstly grind them roughly with sandpaper, and then polish the samples with a polishing machine to obtain calcium fluoride t...

Embodiment 2

[0030] 1) Preparation of powder raw materials: Weigh 5g of commercially available calcium fluoride powder, add lithium fluoride powder to make the content of lithium fluoride 2.0wt%, add absolute ethanol to submerge the powder, and place in Ultrasonic treatment in an ultrasonic cleaner for 60 min, then fully mixed, and dried in an oven for later use;

[0031] 2) Sample loading: Weigh 2 g of the mixed powder obtained in step 1), put it into a graphite mold with an inner diameter of 16 mm, and separate the mold from the mixed powder with graphite paper;

[0032] 3) Sintering of transparent ceramics: Put the filled graphite mold into a vacuum hot-press furnace, evacuate to better than 10Pa, heat up to 700°C, then apply a pressure of 30MPa, and keep warm for 3h;

[0033] 4) Treatment of transparent ceramics: After sintering, take out the ceramic samples, first rough grind them with sandpaper, and then polish the samples with a polishing machine to obtain calcium fluoride transpare...

Embodiment 3

[0035] 1) Preparation of powder raw materials: Weigh 5g of commercially available calcium fluoride powder, add lithium fluoride powder to make the content of lithium fluoride 2.0wt%, add absolute ethanol to submerge the powder, and place in Ultrasonic treatment in an ultrasonic cleaner for 20 minutes, then fully mixed, and dried in an oven for later use;

[0036] 2) Sample loading: Weigh 2 g of the mixed powder obtained in step 1), put it into a graphite mold with an inner diameter of 16 mm, and separate the mold from the mixed powder with graphite paper;

[0037] 3) Sintering of transparent ceramics: Put the filled graphite mold into a vacuum hot-press furnace, evacuate to better than 10Pa, heat up to 730°C, then apply a pressure of 50MPa, and keep warm for 3h;

[0038] 4) Treatment of transparent ceramics: after sintering, take out the ceramic samples, first rough grind them with sandpaper, and then polish the samples with a polishing machine to obtain calcium fluoride trans...

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Abstract

The invention discloses a method for preparing a calcium fluoride transparent ceramic by vacuum hot pressing sintering with lithium fluoride as an auxiliary. The method comprises the following steps of 1) preparation of powder raw materials; 2) loading; 3) sintering of the transparent ceramic; 4) treatment of a ceramic sample to obtain the calcium fluoride transparent ceramic. The method has the advantages that ultrasonic dispersion is used for mixed powder to fully mix calcium fluoride and lithium fluoride powder, during the sintering process, and the added lithium fluoride can promote the densification process of the calcium fluoride powder, which is favorable for the preparation of the calcium fluoride transparent ceramic. The method optimizes a preparation process of the calcium fluoride transparent ceramic. The calcium fluoride transparent ceramic prepared by the method has a good transparency.

Description

technical field [0001] The invention relates to the field of preparation of fluoride transparent ceramics, in particular to a method for preparing transparent ceramics by using commercially available calcium fluoride powder as a raw material and lithium fluoride as an auxiliary agent through vacuum hot pressing and sintering. Background technique [0002] Calcium Fluoride (CaF 2 ) has excellent properties such as high transmittance, low refractive index, wide transmission wavelength range and low phonon energy, and it has received extensive attention as an optical material. As a new type of optical material, transparent ceramics not only have the advantages of high temperature resistance, corrosion resistance and high strength, but also do not have cleavage planes in single crystals. Compared with single crystals, their preparation process is simpler and has broad application prospects. . In recent years, the development of calcium fluoride transparent ceramics with excell...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/553C04B35/645
CPCC04B35/553C04B35/645C04B2235/445C04B2235/6581C04B2235/9653
Inventor 刘作冬贾梦盈高琪位孟军董鹏月井强山刘鹏
Owner XINYANG NORMAL UNIVERSITY
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