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Iron-base alloy catalyst and its preparing method

An iron-based alloy and catalyst technology, applied in the field of iron-based alloy catalysts and their preparation, can solve the problems of less than 30% yield of nickel-based alloy catalyst sheets, diamond micro-cracks, low compressive strength, etc., and achieve the elimination of acid surface depth Effects of contamination, elimination of work hardening, and low production cost

Inactive Publication Date: 2003-05-28
山东工业大学
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Problems solved by technology

However, the yield of nickel-based alloy catalyst sheets produced by this process is less than 30%.
Due to the high cost of raw materials and production process, the price of nickel-based alloy catalyst sheets is expensive and difficult to reduce.
In addition, Ni is very easy to enter the diamond lattice during the process of synthetic diamond, and exists as an impurity, which causes the diamond to produce microcracks due to the expansion coefficient of Ni when the diamond heats up during grinding.
Therefore, using a nickel-based alloy as a catalyst, the synthesized diamond has low grade, low compressive strength, and small particle size.

Method used

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specific Embodiment approach

[0011] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention is provided in the following specific embodiments:

[0012] Adopt the following formula to prepare iron-based alloy catalyst:

[0013] Iron powder: 76% (w.t.)

[0014] Nickel powder: 18% (w.t.)

[0015] Cobalt powder: 1% (w.t.)

[0016] Manganese powder: 4% (w.t.)

[0017] Copper powder: 0.5% (w.t.)

[0018] Graphite powder: 0.5% (w.t.)

[0019] Weigh and mix the above-mentioned powders, mix them evenly, and use a four-column hydraulic forming machine to form them under a pressure of 570MPa to make discs with a diameter of 23mm and a thickness of 0.4mm, and then heat them to 870°C in a sintering furnace, and pass in hydrogen to protect them. , keep warm for 4 hours. Then finish and clean the surface.

[0020] On the six-sided top press, operate according to the process specification of conventional synthetic diamond single crystal. Obtained diamond particle size ≥ 0...

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Abstract

The iron-base alloy catalyst for synthesis of high-grade diamond monocrystal contains Fe, Ni, Mn, Co, Cu and graphite and has a Fe content of 50-76%. The catalyst is prepared through the processes of mixing powder of the components, cold pressing to form, low temperature sintering in sintering furnace, shaping and surface finishing. The preparation process has high finished product rate and the catalyst can be used to produce high-grade diamond with high strength and large size at low cost.

Description

technical field [0001] The invention belongs to the field of metal materials, in particular to an iron-based alloy catalyst for synthesizing high-grade diamond single crystal and a preparation method thereof. Background technique [0002] The artificial synthesis of diamond mainly uses the physical reaction between graphite and catalyst under high temperature and high pressure conditions to promote the SP of carbon atoms in graphite. 2 SP in hybrid state to diamond structure 3 Hybrid state conversion. Nickel-based alloys are widely used as catalysts for synthetic diamond at home and abroad, mainly because the production process of catalyst sheets usually adopts the following technical route: vacuum melting - casting - hot rolling billet - warm rolling - vacuum annealing - pickling - cold rolling - finishing Rolling - stamping - finished product inspection. Therefore, catalyst materials are required to have good ductility, and nickel-based alloys can basically meet the abo...

Claims

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Application Information

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IPC IPC(8): B01J23/889
Inventor 李木森姚章映公志光尹龙卫崔建军李秀森郝兆印李执敏
Owner 山东工业大学
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