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Sealing material for diamond synthesis cavity

A technology for synthesizing cavity and sealing material, which is applied in the process of applying ultra-high pressure, can solve the problems of improving the fluidity of the sealing layer and weakening the sealing performance, and achieves the improvement of high-pressure sealing performance, safety performance, reduction of combined power and The effect of synthetic pressure

Inactive Publication Date: 2014-07-02
ZHONGNAN DIAMOND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Wollastonite will partially decompose into calcium oxide and silicon oxide at high temperature, and then react with other silicates in the sealing layer to form substances with low melting points, which will increase the fluidity of the sealing layer and weaken the sealing performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Start the mixer, add 550kg of coarse pyrophyllite (10-36 mesh), 80kg of aluminum dihydrogen phosphate solution (33wt%), and 170kg of mullite powder in sequence; finally add 200kg of fine pyrophyllite (36 mesh to fine and 180 mesh to coarse). After the mixing is completed, press molding and high-temperature roasting (600K, 4 hours) to obtain a powder compact for sealing, with a bulk density of 2.68-2.72g / cm 3 .

Embodiment 2

[0025] Start the mixer, add 450kg of coarse talc powder (10-36 mesh), 80kg of aluminum dihydrogen phosphate solution (28wt%), and 290kg of mullite powder; finally add 180kg of fine pyrophyllite (36 mesh to 180 mesh) . After the mixing is completed, press molding and high-temperature roasting (600K, 4 hours) to obtain a powder compact for sealing, with a bulk density of 2.56-2.61g / cm 3 .

Embodiment 3

[0027] Start the mixer, add 600kg of coarse pyrophyllite (10-36 mesh), 70kg of aluminum dihydrogen phosphate solution (22wt%), and 120kg of mullite powder in sequence; finally add 210kg of fine pyrophyllite (36 mesh to fine and 180 mesh to coarse). After the mixing is completed, the powder briquette for sealing is obtained through mixing, compression molding, and high-temperature roasting (600K, 4 hours), and its bulk density is 2.65-2.71g / cm 3 .

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Abstract

The invention belongs to the technical field of diamond synthesis, and specifically discloses a sealing material for a diamond synthesis chamber. The raw material composition is: 50-85wt% of layered silicate minerals, 4-40wt% of mullite, 3-18wt% of aluminum dihydrogen phosphate solution, wherein the concentration of aluminum dihydrogen phosphate solution is not more than 33wt% based on P2O5. The sealing medium prepared by the invention greatly improves the high-pressure sealing performance of the cavity, reduces the probability of "pressure relief air gun", shows high stability in diamond synthesis, significantly improves safety performance, and consumes less anvils up to 0.4kg / 10,000 ct or less; the formula of the present invention also has a good energy-saving effect, which reduces the synthesis power and synthesis pressure; because it does not contain unfavorable elements to the growth of diamond, it avoids the pollution of the synthesis chamber and improves the efficiency of the diamond. Synthetic quality.

Description

technical field [0001] The invention belongs to the technical field of diamond synthesis, and in particular relates to a sealing material for a diamond synthesis cavity. Background technique [0002] In the process of synthesizing diamond, in order to make the synthetic block be subjected to the pressure as close as possible to the hydrostatic pressure, suitable materials should be used to undertake the functions of sealing, pressure transmission, and heat preservation. Industry status and literature (such as Chen Tianhu, Wang Daoxuan, Fang Xiaohu, Tang Shupei. The role of dolomite lining materials in synthetic diamond pressure transmission and sealing media. Journal of High Pressure Physics, 2001: 291-296) shows that the need for pressure transmission and heat preservation can be Liners with dolomite as the main component are used to meet the needs of high temperature and high pressure sealing. At present, clay mineral powder briquettes are generally used to meet the needs....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J3/06
Inventor 王志涛刘乾坤丁锐徐华雷
Owner ZHONGNAN DIAMOND CO LTD