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Powder catalyst for synthesizing high strength and excellent quality diamond with low prodn. cost

A powder catalyst, a technology for synthesizing diamond, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of inability to synthesize diamond and low diamond yield. , to achieve the effect of being conducive to uniform nucleation and growth, strengthening interaction, and reducing oxygen content

Inactive Publication Date: 2008-01-30
石门县顺超科技发展有限公司
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  • Description
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  • Application Information

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Problems solved by technology

At present, the domestic diamond industry generally uses flaky NiMnCo catalysts, and the output rate of coarse-grained, high-strength diamonds is extremely low, and it is impossible to synthesize diamonds weighing more than 20kg.

Method used

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  • Powder catalyst for synthesizing high strength and excellent quality diamond with low prodn. cost

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A powder catalyst for synthesizing coarse-grained, high-strength diamond in this embodiment has the alloy ingredients of Ni: 30%, Mn: 0.2%, C: 0.2%, and the balance is Fe in weight percentage.

[0025] Weigh Ni, Fe, Mn ingredients with a purity of 99.9%, melt the ingredients in an intermediate frequency induction furnace under the protection of inert gas, and prepare powder catalyst for synthetic diamond by vacuum / inert gas atomization technology. The prepared new powder catalyst was analyzed, and its alloy powder composition was Ni: 29.8%, Mn: 0.16%, C: 0.18%, N: 150PPm, O: 120PPm and the balance was Fe.

[0026] The alloy is sieved, and the alloy powder with a particle size range of -200 mesh is uniformly mixed with graphite powder in a certain proportion, and diamond is synthesized under a certain pressure and temperature. The proportion of particle size ≥60 mesh accounts for more than 70%, of which 40 / 45 mesh diamond The performance is shown in Table 1.

Embodiment 2

[0028] The equipment and operation method are basically the same as in Example 1. The only difference is that, in weight percentage, the ingredients of the alloy are: Ni: 30%, Mn: 0.3%, C: 0.2%, Cr: 0.02%, the balance is Fe.

[0029] The prepared new powder catalyst was analyzed, and its alloy powder composition was Ni: 29.92%, Mn: 0.28%, C: 0.18%, Cr: 0.018%, N: 160PPm, O: 150PPm, and the balance was Fe.

[0030] Alloy powder with a size of -200 mesh and graphite powder are mixed uniformly in a certain proportion, and diamond is synthesized under a certain pressure and temperature. The proportion of particle size ≥ 60 mesh accounts for more than 70%, and the properties of 40 / 45 mesh diamond are shown in Table 1.

Embodiment 3

[0032] The equipment and operation method are basically the same as in Example 1. The only difference is that, in weight percent, the alloy ingredients are: Ni: 25%, Mn: 0.2%, C: 0.4%, and the balance is Fe.

[0033] The ingredients are melted and poured into prefabricated alloy ingots immediately. After the prefabricated alloy ingots are melted, a new type of powder catalyst for synthesizing coarse particles and high-strength diamond is prepared by vacuum / inert gas atomization technology.

[0034] The prepared new powder catalyst was analyzed, and its alloy powder composition was Ni: 24.75%, Mn: 0.16%, C: 0.38%, N: 120PPm, O: 120PPm, and the balance was Fe.

[0035] Alloy powder with a particle size range of -150 mesh and graphite powder are mixed uniformly in a certain proportion, and diamond is synthesized under a certain pressure and temperature. The proportion of particle size ≥ 60 mesh accounts for more than 70%, and the performance of 50 / 60 mesh diamond is shown in Table...

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Abstract

A powdered catalyst for synthesizing high-strength and high-quality diamond with low cost contains proportionally Ni, Mn, C, N, O, one or more of Cr, Ce and Si, and Fe. The resultant diamond has high output rate, integrity, transparency and thermal stability.

Description

technical field [0001] The invention relates to a powder catalyst for synthesizing diamond, more specifically a powder catalyst for low-cost, high-strength and high-quality diamond. Background technique [0002] At present, the commonly used catalyst materials for diamond production mainly include nickel-based, iron-based and cobalt-based alloys. Cobalt-based catalysts have good melting performance, but are expensive and are rarely used in China. The nickel-based catalyst has a slightly lower yield of synthetic diamond, but the obtained diamond has a good crystal shape, few impurities in the crystal, weak magnetic properties, and high compressive strength; the iron-based catalyst has high activity, high synthesis yield, strong carbon-dissolving ability, and synthesis parameters. it is good. At present, sheet NiMnCo catalysts are commonly used in the domestic diamond industry, and the yield of coarse-grained, high-strength diamonds is extremely low, and diamonds over 20kg ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/755B01J3/06
Inventor 郭宏徐骏马自力石力开徐柱天杨必成张习敏
Owner 石门县顺超科技发展有限公司
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