CN1230249C - Powder catalyst for synthesis of coarse gronule high-strength diamond - Google Patents
Powder catalyst for synthesis of coarse gronule high-strength diamond Download PDFInfo
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- CN1230249C CN1230249C CN 01144857 CN01144857A CN1230249C CN 1230249 C CN1230249 C CN 1230249C CN 01144857 CN01144857 CN 01144857 CN 01144857 A CN01144857 A CN 01144857A CN 1230249 C CN1230249 C CN 1230249C
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Abstract
The present invention relates to a powdery catalyst for synthesizing coarse-particle high-strength diamonds. The present invention is prepared from the alloying components of the percentage by weight: 24 to 26% of Mn, 4.5 to 5.5% of Co, 0.02 to 0.5% of Ce-enriched mixed rare earth, 0.05 to 0.2% of Mo, 50 to 150 ppm of N and Ni as the rest. The present invention has oxygen content of at least 240 ppm, good sphericity and uniform alloying component distribution; the diamonds synthesized by the present invention are characterized in that the yield per unit is more than 12Ct, the extraction rate of diamonds with the static pressure intensity of higher than 20kg is more than 10%, diamonds of more than 60 meshes account for more than 70%, the diamonds have high crystal perfection and good transparency, and the diamonds are ideal raw materials for manufacturing diamond saw blades and other tool products.
Description
Technical field
The present invention relates to powdered catalyst for synthesizing diamond, a kind of synthesising coarse particle, high-strength diamond powder catalyst of being used for of more specifically saying so.
Background technology
As the powder catalyst that synthesising coarse particle, high-strength diamond are used, require its specific area big, with graphite mixing diamond synthesis per unit area yield height, the adamantine conversion ratio height of graphite, and can synthesising coarse particle, high-strength diamond.Patent CN1063237 provides a kind of catalyst for synthesizing high-strength diamond, and its chemical composition is (weight): Mn:1-2%, C:0.02-1%, Co:0-4%, and surplus is the slice catalyst of iron, silicon and the impurity of nickel and trace.Adopt 4 carats of this slice catalyst diamond synthesis φ 18mm cavity per unit area yields, about 45-50,50-60 order intensity 20kg.
Summary of the invention
The purpose of this invention is to provide a kind of synthesising coarse particle, high-strength diamond powder catalyst.This powder catalyst specific area is big, can with graphite powder mixing diamond synthesis, make diamond synthesize the per unit area yield height, diamond has high compression strength and thermal shock intensity preferably, improves the grade of diamond.
For achieving the above object, the present invention takes following technical scheme: this synthesising coarse particle, high-strength diamond powder catalyst, percentage meter by weight, its alloying component is Mn:24-26%, Co:4.5-5.5%, rich Ce mishmetal: 0.175-0.4%, Mo:0.079-0.12%, N:50-150PPm, surplus is Ni.
In this alloy compositions, added proper amount of rare-earth and molybdenum, rare earth alloy can improve the dissolubility of urging of catalyst alloy, makes adamantine synthetic scope wideer, and the easier grasp of technology, and alligatoring diamond grit improve diamond compression strength; Rare earth has deoxidation simultaneously, therefore, adds the oxygen content that a spot of rare earth can also reduce powder catalyst.The present invention adopts rich Ce mishmetal, and cost of alloy is lower.In addition, molybdenum can promote diamond to grow up, and is mixed with and is beneficial to the synthesising coarse particle diamond so contain the powder catalyst of molybdenum and graphite.The suitable nitrogen content of control in the powder catalyst helps the diamond color and is yellow.
Synthesising coarse particle of the present invention, high-strength diamond with the alloying component optimum range of powder catalyst are: percentage meter by weight, its alloying component is Mn:24.5-25.5%, Co:4.5-5.5%, rich Ce mishmetal: 0.2-0.4%, Mo:0.08-0.12%, N:50-150PPm, surplus is Ni.
The particle of synthesising coarse particle of the present invention, high-strength diamond usefulness powder catalyst is spherical in shape or class is spherical.
Synthesising coarse particle of the present invention, high-strength diamond are following step with the preparation method of powder catalyst:
(1) batching, by weight percentage, the food ingredient of this alloy is Mn:24-26%, Co:4.5-5.5%, rich Ce mishmetal: 0.175-0.4%, Mo:0.079-0.12%, surplus is Ni,
(2) fusing of will preparing burden is prepared into the prealloy ingot, then with the remelting under 1400-1600 ℃ of temperature of prealloy ingot, feed nitrogen in the reflow process, duration of ventilation 8-10min mixes N, utilizes gases at high pressure (1.5-4.5MPa) at last, metal liquid stream is smashed be atomized into alloy powder.
This synthesising coarse particle of the present invention, high-strength diamond powder catalyst adopt fast cold atomization process preparation, the spherical in shape or spherical Fig. 1 of opinion of class of the powder catalyst particle of making.
Advantage of the present invention is:
1, powdered catalyst for synthesizing diamond good sphericity of the present invention, specific area is big, can fully mix with the graphite powder, contact area is big, can effectively improve the utilization rate of catalyst and graphite, electric current reduces during diamond synthesis, and top hammer consumption is little, diamond synthesizes the per unit area yield height, therefore can effectively reduce the production cost of diamond.
2, the present invention adopts fast cold atomization process to make the alloy powder composition even, even tissue is tiny, particle is spherical in shape, see Fig. 2, powder catalyst helps the C atom and supplies carbon in the three-dimensional diffusion, help adamantine homogeneous nucleation and grow up, improve the crystal perfection of diamond synthesis, thereby make diamond have high compression strength.
3, powder catalyst of the present invention is to add rich Ce mishmetal, Mo, N on matrix element Ni, Mn, Co basis, rich Ce mishmetal can reduce the oxygen content of powder catalyst, the catalytic activity that improves catalyst promotes diamond crystal to grow up, improve adamantine transparency, in powder catalyst, add suitable nitrogen 50-150PPm simultaneously, help the diamond color and be yellow, improve the grade of diamond synthesis.
4, powder catalyst of the present invention mixes the back diamond synthesis with graphite powder, pure in the crystal body after synthetic, the inclusion enclave total amount is few, and comparatively tiny dispersion distributes, show as random arrangement, no bubble occurs, thereby makes diamond have thermal shock intensity preferably, is that the desirable feedstock of making the diamond tool goods is seen Fig. 3.
Description of drawings
Fig. 1 is the ESEM pattern photo of powder catalyst of the present invention
Fig. 2 is the microstructure picture of powder catalyst of the present invention
Fig. 3 is for adopting powder catalyst of the present invention and the adamantine ESEM pattern of the mixed synthetic coarse granule of graphite powder photo
The specific embodiment
The present invention is further illustrated below to utilize embodiment, will help product of the present invention and advantage thereof are done further understanding, and the present invention is not subjected to the restriction of these embodiment, and protection scope of the present invention is limited by claims.
Embodiment 1
A kind of synthesising coarse particle in the present embodiment, high-strength diamond powder catalyst, percentage meter by weight, its alloying ingredient composition is Mn:25%, Co:5%, rich Ce mishmetal (Ml): 0.3%, Mo:0.1%, surplus are Ni.
Take by weighing purity and be 99.9% Ni, Mn, Co, rich Ce mishmetal (Ml) and Mo batching, under inert gas shielding, in intermediate frequency furnace, will prepare burden melt after, prepare powdered catalyst for synthesizing diamond by fast cold atomization process.
The powder catalyst that makes is analyzed, and its alloyed powder composition is Mn:24.75%, Co:4.96%, Ml:0.28%, Mo:0.1%, N:120PPm, and surplus is Ni.
With the alloy screening, get particle size range and evenly mix by a certain percentage with the graphite powder for-150 purpose alloyed powders, diamond synthesis under certain pressure and temperature, granularity 〉=60 purpose ratios account for more than 70%, and wherein the adamantine performance of 50/60 order is as shown in table 1:
The performance of table 1 Ni-Mn-Co powder catalyst diamond synthesis
| The sample classification | Isostatic pressing strength (kg) | TI (％) | TTI(％) | |
| 900℃ | 1100℃ | |||
| 50/60 | 17.8 | 69.34 | 66.06 | 51.44 |
Embodiment 2
Its equipment and method of operating be substantially with embodiment 1, uniquely be not both, and percentage meter by weight, the food ingredient of its alloy is: Mn:25%, Co:5%, Ml:0.2%, Mo:0.1%, surplus are Ni.
The powder catalyst that makes is analyzed, and its alloyed powder composition is Mn:24.7%, Co:4.92%, Ml:0.175%, Mo:0.1%, N:140PPm, and surplus is Ni.
Get and be of a size of-150 purpose alloyed powders and the graphite powder mixes by a certain percentage, diamond synthesis under certain pressure and temperature, granularity 〉=60 purpose ratios account for more than 70%, and wherein the adamantine performance of 50/60 order sees Table 2.
The performance of table 2 Ni-Mn-Co powder catalyst diamond synthesis
| The sample classification | Isostatic pressing strength Kg | TI (％) | TTI(％) | |
| 900℃ | 1100℃ | |||
| 50/60 order | 18.6 | 69.1 | 61.3 | 49.8 |
Embodiment 3
Its equipment and method of operating be substantially with embodiment 1, uniquely be not both, and percentage meter by weight, the food ingredient of its alloy is: Mn, 25%, Co:5%, Ml:0.2%, Mo:0.08%, surplus are Ni.
To prepare burden the fusing after pour into the prealloy ingot immediately, with after the remelting of prealloy ingot, produce synthesising coarse particle, high-strength diamond powder catalyst again by fast cold atomization technique.
The powder catalyst that makes is analyzed, and its alloyed powder composition is Mn:24.75%, Co:4.97%, Ml:0.18%, Mo:0.079%, N:120PPm, and surplus is Ni.
Get particle size range and mix by a certain percentage for-150 purpose alloyed powders and graphite powder, diamond synthesis under certain pressure and temperature, granularity 〉=60 purpose ratios account for more than 70%, and wherein the adamantine performance of 50/60 order sees Table 3.
The performance of table 3 Ni-Mn-Co powder catalyst diamond synthesis
| The sample classification | Isostatic pressing strength Kg | TI (％) | TTI(％) | |
| 900℃ | 1100℃ | |||
| 50/60 order | 18 | 72.01 | 66.1 | 50.48 |
In sum, product oxygen content≤240PPm of the present invention, good sphericity, alloying component is even, adopts the synthetic diamond per unit area yield of this catalyst up to (φ 23mm cavity) more than the 12Ct, and isostatic pressing strength is higher than the diamond recovery rate of 20kg greater than 10%, 60 orders account for more than 70% with thick ratio in the diamond, diamond crystal percentage of head rice height, transparency is good, is the desirable feedstock of making instrument goods such as diamond saw blade.
Claims (3)
1, a kind of synthesising coarse particle, high-strength diamond powder catalyst, it is characterized in that: percentage meter by weight, its alloying component is Mn:24-26%, Co:4.5-5.5%, rich Ce mishmetal: 0.175-0.4%, Mo:0.079-0.12%, N:50-150PPm, and surplus is Ni.
2, synthesising coarse particle according to claim 1, high-strength diamond powder catalyst, it is characterized in that: percentage meter by weight, its alloying component is Mn:24.5-25.5%, Co:4.5-5.5%, rich Ce mishmetal: 0.2-0.4%, Mo:0.08-0.12%, N:50-150PPm, surplus is Ni.
3, synthesising coarse particle according to claim 1 and 2, high-strength diamond is characterized in that with powder catalyst: this powder catalyst particle is spherical in shape or class is spherical.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 01144857 CN1230249C (en) | 2001-12-26 | 2001-12-26 | Powder catalyst for synthesis of coarse gronule high-strength diamond |
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| CN 01144857 CN1230249C (en) | 2001-12-26 | 2001-12-26 | Powder catalyst for synthesis of coarse gronule high-strength diamond |
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| CN1230249C true CN1230249C (en) | 2005-12-07 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101716515B (en) * | 2009-11-16 | 2011-12-28 | 北京有色金属研究总院 | FeMn base powder catalyst containing rare-earth additive agent for artificially synthesizing diamond |
| CN104226355B (en) * | 2014-09-12 | 2016-09-14 | 河南省力量钻石股份有限公司 | A kind of synthesizing superfine particles diamonds powder catalyst |
| CN104264210B (en) * | 2014-09-12 | 2016-08-24 | 河南省力量钻石股份有限公司 | A kind of synthetic method of ultra-fine grain diamond single crystal |
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