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A method for preparing synthetic diamond column

A technology of artificial diamond and synthetic column, which is applied in the application of ultra-high pressure process, etc., can solve the problems of not specifying the preparation method in detail, the uniformity cannot be guaranteed, and prolong the mixing time, so as to save process time, ensure easy control and Reproducibility, effect of reducing twinning

Active Publication Date: 2021-08-27
有研增材技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Composition segregation, uneven nucleation, and insufficient carbon source are the main bottlenecks affecting the synthetic effect and stability of synthetic diamond. Therefore, when preparing synthetic columns, multiple mixing and cold isostatic granulation, crushing, and recompression must be carried out. Molding and other processes, the process is more complicated
In order to solve the above problems, the current industry adopts methods such as prolonging the mixing time, multiple isostatic crushing, and granulation. The process is complicated, the efficiency is low, and the uniformity cannot be guaranteed.
[0005] There are few relevant reports about the detailed process and patented technology for the preparation of synthetic diamond synthetic columns, and most of the patents that can be found are about the design or improvement of the assembly structure. For example, CN204724131U discloses a method for designing a large-grain diamond assembly structure; CN 105921076 discloses a method for preparing green synthetic diamond, which mentions the preparation of synthetic columns, but simply mentions and does not describe its preparation method in detail

Method used

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  • A method for preparing synthetic diamond column
  • A method for preparing synthetic diamond column
  • A method for preparing synthetic diamond column

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Take by weighing alloy composition and be FeNi30, particle size-200 purpose catalyst powder 50 kilograms, mother powder (-500 purpose diamond crystal powder 50wt%,-600 purpose superfine cobalt powder 25wt%,-600 purpose superfine chromium powder 25wt% mix homogeneously ) 0.4 kg, put into the VH-10 shaping machine, adjust the shaping speed to be 1000 rev / min, and the time is 100 minutes to obtain the catalyst powder after spheroidization; image 3 As shown, it is a schematic diagram of the combination of FeNi30 catalyst powder and master powder and graphite coating. The master powder particles are pressed into or embedded in the surface of the catalyst particles; then take 0.5 kg of ethylene glycol into the spheroidized catalyst and stir evenly, and then Put into 10 kilograms of graphite powders, adjust rotating speed and be 500 rev / mins, obtain composite catalyst particles after mixing for 180 minutes, as Figure 4 Shown is a photo of FeNi30 catalyst particles and graphi...

Embodiment 2

[0048] Take by weighing alloy composition and be FeNi29Co1, particle size-200 purpose catalyst powder 60 kilograms, master powder (-500 purpose diamond crystal powder 60wt%,-600 purpose superfine cobalt powder 20wt%,-600 purpose superfine chromium powder 20wt% mix homogeneously ) 0.5 kg, put into VH-10 shaping machine for spheroidization, adjust the rotating speed to be 900 rpm, and take 120 minutes to obtain the catalyst powder after spheroidization; then get 0.6 kg of ethylene glycol and put it into the shaped catalyst and stir Evenly, then put in 12 kilograms of graphite powder, adjust the rotating speed to 500 rpm, mix for 180 minutes, take it out and put it into the three-dimensional mixer, then weigh 99.4 kilograms of graphite powder and add it to the three-dimensional mixer, so that the weight of catalyst and graphite When the ratio reaches 3.5:6.5, add 1.5 kg of ethylene glycol and mix for 220 minutes to obtain a uniform catalyst and graphite mixed powder; use a 200-ton...

Embodiment 3

[0050] Take by weighing alloy composition and be FeNi25Mn5, particle size-325 purpose catalyst powder 75 kilograms, parent powder (-500 purpose diamond crystal powder 40wt%,-600 purpose superfine cobalt powder 30wt%,-600 purpose superfine chromium powder 30wt% mix powder) 0.8 kg, put it into VH-10 shaping machine, adjust the shaping speed to 800 rpm, and shape for 150 minutes to obtain the catalyst powder after spheroidization; then take 0.8 kg of ethylene glycol and put it into the shaped catalyst Stir evenly, then put in 15 kilograms of graphite powder, adjust the rotating speed to 500 rpm, take it out after mixing for 180 minutes and put it into a three-dimensional mixer, then weigh 160 kilograms of graphite powder and add it to a three-dimensional mixer to make the catalyst and graphite When the weight ratio reaches 3:7, add 1.8 kg of ethylene glycol, and mix for 250 minutes to obtain a uniform catalyst and graphite mixed powder; use a 200-ton four-column press, select a Φ5...

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Abstract

The invention discloses a method for preparing a synthetic diamond column, which belongs to the technical fields of superhard material synthesis technology and special new material preparation. The method includes mixing the catalyst powder with the mother powder, and then using a shaping machine to spheroidize, so that the mother powder particles are pressed into or embedded in the surface of the catalyst particles; the spheroidized catalyst powder is mixed with graphite powder to form a graphite-coated composite catalyst. Particles; graphite powder is added to the composite catalyst particles again, and fully mixed by a three-dimensional mixer; the mixed powder is pressed into a synthetic column by a four-column press after selecting a mold; the synthetic column is subjected to vacuum heat treatment, and then pressed twice After shaping, they are assembled to obtain a synthetic unit. The artificial diamond synthesized by the synthesis column prepared by the method has complete crystal form, uniform growth, few twins and high grade.

Description

technical field [0001] The invention discloses a method for preparing a synthetic diamond column, in particular to a method for uniformly mixing catalyst powder, parent powder and graphite powder to prepare a high-quality synthetic diamond column. The invention relates to a method for uniformly mixing metal powder and nonmetal powder, and belongs to the technical fields of superhard material synthesis technology and special new material preparation. Background technique [0002] The current artificial diamond synthesis column is made by powder mixing, that is, a certain proportion of catalyst powder is added to the parent powder (nucleating agent, powder) and mixed with sufficient graphite powder, and then prepared after multiple isostatic pressing and molding. Synthetic column, diamond synthesis after vacuum heat treatment, shaping and assembly. The traditional synthesis column preparation method such as figure 1 As shown, the mother powder, graphite and catalyst are mixe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J3/06
CPCB01J3/06B01J2203/0655
Inventor 贺会军赵文东赵新明盛艳伟张金辉贺宝边隽杰安宁王志刚朱学新胡强刘英杰刘建徐蕾卢彩涛
Owner 有研增材技术有限公司
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