Polycrystalline diamond catalyst and thermal treatment process thereof
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A polycrystalline diamond and catalyst technology, applied in the field of artificial diamond, can solve the problems of inability to form polycrystalline diamond structure, low strength, and large magnetic properties of single crystal diamond, and achieve the effect of less impurities, high yield per unit area, and rough surface
Inactive Publication Date: 2014-07-30
HENAN FAMOUS DIAMOND IND CO LTD
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Problems solved by technology
Single crystal diamond has the defects of high magnetism and low strength, which can no longer meet the market demand. Polycrystalline diamond particles are composed of multiple subcrystals with embedded structures, and have high strength, which can better meet the needs of high-end markets at home and abroad.
But current catalysts do not allow diamond to form a polycrystalline structure during growth
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Embodiment 1
[0012] The weight percentage of the chemical composition of the polycrystalline diamond catalyst is: 3% cobalt, 34% iron, 27% manganese, 20% nickel, 13% silicon and 3% carbon.
[0013] The heat treatment process for the above polycrystalline diamond catalyst includes the following steps:
[0014] 1). Divide the aforementioned catalyst into three particle sizes: 80 / 100, 200 / 250 and 300 / 400;
[0015] 2). Mix the catalysts with three particle sizes in step 1) in a ratio of 2:3:5;
[0016] 3) Put the mixed catalyst in step 2) into the muffle furnace in a stainless steel box and bake at 580°C for 28 minutes to obtain a new type of catalyst with irregular particles.
Embodiment 2
[0018] Cobalt 4%, iron 31%, manganese 27%, nickel 22%, silicon 13% and carbon 3%.
[0019] The heat treatment process for the above polycrystalline diamond catalyst includes the following steps:
[0020] 1). Divide the aforementioned catalyst into three particle sizes: 80 / 100, 200 / 250 and 300 / 400;
[0021] 2). Mix the catalysts with three particle sizes in step 1) in a ratio of 2:3:5;
[0022] 3) Put the mixed catalyst in step 2) into the muffle furnace in a stainless steel box and bake at 700°C for 14 minutes to obtain a new type of catalyst with irregular shaped particles.
Embodiment 3
[0024] Cobalt 3.5%, iron 30%, manganese 30%, nickel 19%, silicon 14% and carbon 3.5%.
[0025] The heat treatment process for the above polycrystalline diamond catalyst includes the following steps:
[0026] 1). Divide the aforementioned catalyst into three particle sizes: 80 / 100, 200 / 250 and 300 / 400;
[0027] 2). Mix the catalysts with three particle sizes in step 1) in a ratio of 2:3:5;
[0028] 3) Put the mixed catalyst in step 2) into the muffle furnace in a stainless steel box and bake at 650°C for 22 minutes to obtain a new type of catalyst with irregularly shaped particles.
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Abstract
The invention discloses a polycrystalline diamond catalyst and a thermal treatment process thereof. The polycrystalline diamond catalyst comprises the following chemical components in percentage by weight: 3-4 percent of cobalt, 27-34 percent of iron, 27-31 percent of manganese, 18-22 percent of nickel, 13-17 percent of silicon and 3-4 percent of carbon. The catalyst is thermally treated for certain time at certain temperature to form a novel catalyst. The polycrystalline diamond catalyst and the thermal treatment process thereof have the beneficial effects that after the catalyst is thermally treated, the surface of the catalyst is roughened by oxidization, a grain structure of the catalyst is changed, and the synthesis contact range of the catalyst is widened; the catalyst treated by using the thermal treatment process has the advantages of wide synthesis pressure range, wide synthesis temperature range, high yield per unit, short time and controllability of the synthesis process when being used for synthesizing polycrystalline diamond; the synthesized polycrystalline diamond is irregularly shaped, has the rough surface and few impurities, is dark green, and is excellent in self-sharpening capacity and high in thermal stability.
Description
Technical field [0001] The invention relates to the field of artificial diamonds, in particular to a polycrystalline diamond catalyst and its heat treatment process. Background technique [0002] Synthetic diamond is converted from graphite under ultra-high pressure and high temperature conditions with the participation of catalyst metals. High-grade synthetic diamond is synthesized. Under ultra-high-pressure and high-temperature synthesis environment, nickel-manganese or nickel-cobalt catalysts are used. The current common catalyst is Ni70-Mn25-Go5, which converts graphite into single crystal diamond. Single crystal diamond has the defects of large magnetism and low strength, which can no longer meet the market demand. Polycrystalline diamond particles are composed of multiple sub-crystals with embedded structure and have high strength, which can better meet the needs of high-end markets at home and abroad. However, the current catalysts cannot make the diamond form a polycryst...
Claims
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Application Information
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