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Carbonizing-body diamond catalyst and preparing method

A diamond and catalyst technology, applied in the field of metal materials, can solve the problems of low diamond grade, small particle size, and lack of replenishment of cementite, and achieve the effect of high output

Inactive Publication Date: 2008-06-25
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] For a long time, catalytic metal plus graphite has been widely used at home and abroad to synthesize diamond. In this process, although cementite can also be produced, as the diamond grows, a large amount of cementite will be consumed. Due to the physical, chemical and metallurgical environment, the cementite consumed by the growth of diamond cannot be replenished. Therefore, the continued formation and growth of diamond stagnates due to the lack of cementite. Therefore, the diamond produced by traditional methods is of low grade and small granularity

Method used

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  • Carbonizing-body diamond catalyst and preparing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Example 1: Each component is calculated by weight, 38 parts of cementite, 26 parts of iron, 5 parts of nickel, and 1 part of graphite.

[0014] Preparation:

[0015] A. Mix cementite powder, iron powder, nickel powder and graphite powder evenly according to the aforementioned weight parts, and dry to remove moisture;

[0016] B. The mixed powder is cold-pressed into a sheet under a pressure of 620MPa;

[0017] C. Shaping, surface cleaning, removal of dirt.

[0018] The diamond produced by the above catalyst is shown in the accompanying drawing.

Embodiment 2

[0019] Example 2: Each component is calculated by weight, 48 parts of cementite, 40 parts of iron, 7 parts of nickel, and 5 parts of graphite.

[0020] Preparation:

[0021] A. Mix cementite powder, iron powder, nickel powder and graphite powder evenly according to the aforementioned weight parts, and dry to remove moisture;

[0022] B. The mixed powder is cold-pressed into a sheet under a pressure of 680MPa;

[0023] C. Shaping, surface cleaning, removal of dirt.

Embodiment 3

[0024] Example 3: Each component is calculated by weight, 56 parts of cementite, 35 parts of iron, 10 parts of nickel, and 6 parts of graphite.

[0025] Preparation:

[0026] A. Mix cementite powder, iron powder, nickel powder and graphite powder evenly according to the aforementioned weight parts, and dry to remove moisture;

[0027] B. The mixed powder is cold-pressed into a sheet under a pressure of 700MPa;

[0028] C. Shaping, surface cleaning, removal of dirt.

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Abstract

This invention relates to a diamond shape carburizing catalyst and preparation methods, by weight of each component in terms of cementite 38-69, iron 26-41, nickel 5-15, and graphite 1-8.4. The preparation method of synthetic diamond shape carburizing catalyst: A. the powder of carburization, iron, nickel powder, and graphite mixed uniform drying the damp according to the aforementioned weight; B. Mixed powder cold molding remaining in the 620-pressure; C. shaping, surface cleaning, removing dirt. This invention used cementite, iron, nickel and graphite as a catalyst to compose synthetic diamond, can provide a lot of cementite in the process of synthesis to supplement the consumed cementite in the diamond growth process, thereby diamond formation and growth continue to be maintained, in order to provide material source of obtaining high-grade, high-yield, the big diamond particles.

Description

technical field [0001] The invention relates to the field of metal materials, in particular to a cementite-type diamond catalyst for synthesizing high-grade, large-grain diamond single crystals and a preparation method thereof. Background technique [0002] We know that graphite carbon and diamond are different manifestations of carbon, which are allotropes of carbon. The essence of synthetic diamond is to transform the graphite structure of carbon into diamond structure under artificial intervention. In 2002, "Science Bulletin" Volume 47, Issue 9, Page 669 published the research results of Xu Bin et al. titled "The Structure of Metal Coating and the Growth of Synthesized Diamond with Iron-based Catalyst". In the paper, graphite carbon, The transformation relationship between cementite and diamond proves that the transformation from graphite carbon to diamond is not a simple rearrangement process of carbon atoms, but a series of intermediate links. Among them, under the at...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J3/06B01J27/22B01J23/755
Inventor 崔建军崔潇李木森尹龙卫宫建红
Owner SHANDONG UNIV