WO2005065809A1 - 高硬度導電性ダイヤモンド多結晶体およびその製造方法 - Google Patents
高硬度導電性ダイヤモンド多結晶体およびその製造方法 Download PDFInfo
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- WO2005065809A1 WO2005065809A1 PCT/JP2004/018011 JP2004018011W WO2005065809A1 WO 2005065809 A1 WO2005065809 A1 WO 2005065809A1 JP 2004018011 W JP2004018011 W JP 2004018011W WO 2005065809 A1 WO2005065809 A1 WO 2005065809A1
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Definitions
- the present invention relates to a diamond and a method for producing the same, and in particular, has high hardness used for tools such as cutting tools, dressers, dies, and drill bits, and has high strength, heat resistance, and acid resistance. And a method for producing the same. Background art
- Patent Document 1 Japanese Patent Application Laid-Open No. Hei 4 74766
- Patent Document 2 Japanese Patent Application Laid-Open No. 4114966
- Non-Patent Document 1 F.P.Bundy J. Chem. Phys., 38 (1963) 631-643
- Non-Patent Document 2 M. Wakatsuki et.al. Japan. J. Appl. Phys., 11 (1972) 578
- Non-Patent Document 3 S. Naka et.al.Nature 259 (1976) 38
- the sintering aid used is contained in the polycrystal, which acts as a catalyst for promoting the graphitization of diamond. Poor heat resistance. In other words, even in an inert gas atmosphere, the diamond Is a graphite dagger. Also, due to the difference in thermal expansion between the sintering aid and diamond, fine cracks are likely to occur in the polycrystal. In addition, since metal such as Co exists as a continuous layer between diamond particles, mechanical properties such as hardness and strength of the polycrystalline body are reduced.
- a diamond sintered body using SiC as a bonded body has excellent heat resistance. The strength is low because there is no bonding between diamond grains.
- a diamond sintered body using a carbonate as a sintering aid has sufficient mechanical properties due to the presence of a carbonate substance at the force grain boundary, which has excellent heat resistance compared to a sintered body using a Co binder. I can't say.
- a diamond production method involves converting non-diamond carbon such as graphite (graphite), glassy carbon, and amorphous carbon into diamond directly under ultra-high pressure and high temperature without a catalyst or a solvent.
- non-diamond carbon such as graphite (graphite), glassy carbon, and amorphous carbon
- a polycrystalline single-phase diamond can be obtained.
- Non-patent document 1] [Non-patent document 2], and [Non-patent document 3] show that, using graphite as a starting material, a diamond polycrystal is obtained by direct conversion under ultra-high pressure and high temperature of 14 18 GPa and 3000 K or more. Is obtained.
- the present invention has been made to solve the above problems of the conventional technology, and has a sufficient strength that can be applied as a tool such as an IJ cutting tool, a dresser, a die, or a drill bit. It is an object of the present invention to provide a highly-hard and conductive polycrystalline diamond having high hardness, heat resistance, and resistance to oxidation, and capable of low-cost electric discharge machining. Means for solving the problem
- the present inventors have proposed a method of directly converting non-diamond carbon into diamond under ultra-high pressure and high temperature, and using graphite containing non-diamond carbon as an inert gas.
- ultrafine or amorphous boron-containing carbon material with a size of several tens of nanometers or less by mechanical grinding and uniform mixing in Under the bonding conditions, it was evident that particles having a particle size of several tens of nm or less were firmly bonded and a dense polycrystalline diamond with conductivity was obtained.
- amorphous carbon containing boron as a solid solution, graphite carbon, or diamond powder was used as a starting material, non-diamond phases such as B
- the polycrystalline diamond was much higher in hardness, higher in strength, more excellent in heat resistance and oxidation resistance than conventional polycrystalline materials, and at the same time, could be subjected to electric discharge machining.
- the high-hardness conductive polycrystalline diamond according to the present invention starts from an amorphous or fine graphite carbonaceous material under ultra-high pressure and high temperature without adding a sintering aid or a catalyst.
- the concentration of boron in the diamond particles is less than 10 ppm, sufficient conductivity cannot be obtained, and the discharge power becomes difficult. If the concentration exceeds 100 ppm, a non-diamond phase such as BC precipitates in the diamond sintered body, and the mechanical properties of the sintered body are reduced.
- Another high-hardness conductive polycrystalline diamond according to the present invention is an ultra-high-conductivity polycrystalline diamond containing amorphous carbon containing boron as a solid solution, graphite carbon, and diamond powder as starting materials.
- a polycrystalline material which is directly converted to diamond or sintered directly under high pressure and high temperature without addition of a sintering agent or catalyst, and which has substantially only diamond power.
- the maximum particle size is less than lOOOOnm, the average particle size is less than 5000nm, and the diamond particles contain boron in a range of lOOOppm to lOOOOOppm.
- the concentration of boron in the diamond particles is less than 100 ppm, the pressure and temperature conditions required for conversion sintering are as high as 7.5 GPa and 2000 ° C or higher, and improvement in oxidation resistance is expected. Can not. On the other hand, if the content exceeds 100 ppm, non-diamond phases such as BC precipitate in the diamond sintered body, and the mechanical properties of the sintered body deteriorate.
- the specific resistance is preferably 10 ⁇ cm or less. This is because when the non-resistance becomes 10 ⁇ cm or less, the discharge power can be efficiently obtained.
- the diamond constituting the sintered body has a maximum particle size of 50 nm or less and an average particle size of 30 nm or less. By making the diamond particle diameter smaller than these values, the strength of the sintered body can be increased.
- the hardness is preferably 80 GPa or more, more preferably 11 OGPa or more.
- graphite containing boron is mechanically pulverized in an inert gas by a planetary ball mill or the like to remove amorphous or fine boron.
- a carbon material containing graphite is produced directly at a temperature of 1500 ° C or higher and under pressure conditions where the diamond is thermodynamically stable, without the addition of sintering aids or catalysts. It is characterized by being converted and sintered at the same time.
- the maximum particle size of the graphite carbon material containing crystalline or fine boron can be preferably 10 Onm or less, more preferably 50 nm or less.
- the half width of the (002) diffraction line of the X-ray diffraction pattern of a graphite carbon material containing amorphous or fine boron can be preferably 50 nm or less, more preferably 10 nm or less. It is also possible to use a graphite-type carbon material containing amorphous or fine boron in which the diffraction line is not observed.
- the high-hardness conductive polycrystalline diamond according to the present invention is composed of a polycrystalline substance which is substantially capable of producing only diamond and has a maximum diamond particle size of 100 nm or less, an average particle size of 5000 nm or less, and contains diamond within the diamond particles. It is preferable that the content of boron is not less than lOOOppm and not more than lOOOOOppm in terms of hardness and strength of the polycrystal.
- the specific resistance of the diamond is 1 ⁇ cm or less, because the discharge can be performed more easily.
- the diamond has a maximum particle diameter of lOOOnm or less and an average particle diameter of 500 nm or less.
- the hardness is preferably 80 GPa or more, and more preferably 11 OGPa or more in terms of hardness, strength and the like.
- amorphous carbon is preferably used as the carbon material containing boron in the above-described production method.
- graphite carbon is preferably used as the carbon material containing boron in the above production method.
- the carbon material containing boron is diamond-like carbon, and a method of sintering without adding a sintering aid or a catalyst is also preferable.
- a graphite powder to which boron is added is used, and this is pulverized and mixed by a pulverizer such as a planetary ball mill in an inert gas atmosphere such as an argon gas or a nitrogen gas for several hours. Then, it is pulverized to a maximum particle size of 100 nm or less, preferably 50 nm or less.
- the average particle size of the pulverized fine boron-containing graphite is calculated to be less than 50 nm, preferably less than lOnm, from the half-width of the (002) diffraction line in the X-ray diffraction pattern.
- the X-ray diffraction pattern is so fine or amorphous that no (002) diffraction line is observed. For example, if there is a coarse graphite particle exceeding lOOnm, the diamond after direct conversion will also coarsen and the structure will be non-uniform (mechanical strength will decrease due to many stress concentration sites). Not preferred.
- the amorphous or fine boron-containing graphite obtained through the above-mentioned pulverizing step is filled into a metal capsule such as Mo or Ta in a high-purity inert gas atmosphere. Since the ultrafine boron-containing graphite after milling is very active, if it is exposed to the air, it will easily adsorb gas and moisture, hindering the conversion to diamond and sintering, so the filling work is also difficult. It should always be performed in a high-purity inert gas.
- the diamond is kept at a temperature of 1500 ° C or more and a pressure that is thermodynamically stable for a predetermined time, whereby the amorphous or fine boron-containing graphite is treated. Is directly converted to diamond and sintered at the same time. At this time, the added boron is taken into the lattice sites of the diamond crystal particles, and becomes a P-type semiconductor, thereby generating conductivity. As a result, a conductive diamond polycrystal having an extremely dense and homogeneous structure in which fine and uniform diamond particles are firmly bonded is obtained.
- this polycrystalline body It has a very fine and homogeneous structure with a maximum particle size of 100 nm or less, or an average particle size of 50 nm or less, more preferably a maximum particle size of 50 nm or less, and an average particle size of 30 nm or less. For this reason, this polycrystal has a hardness of 80 GPa or more, and in some cases, 11 OGPa or more, which is higher than that of a diamond single crystal.
- the polycrystalline diamond of the present invention can be manufactured and processed at a low cost, which is extremely useful as a tool such as a cutting tool, a dresser, a die, and a drill bit, etc. .
- amorphous carbon or graphite powder or molded body, or diamond powder or molded body in which boron is dissolved in a solid solution of 100 ppm or more is used as a starting material.
- amorphous carbon or graphite powder or molded body in which boron is dissolved in a solid solution of lOOOOppm or more for example, a mixture of coke and boron carbide is subjected to a temperature of 1,000 or more Can be made by processing.
- gas power containing methane and boron can be obtained by a gas phase method (CVD method).
- Amorphous carbon or graphite containing lOOOOppm or more of boron is filled with a diamond powder or a compact in a metal capsule such as Mo or Ta.
- the diamond is held at a temperature of 1500 ° C or more and a pressure at which the diamond is thermodynamically stable for a predetermined time.
- amorphous carbon and graphite are sintered simultaneously with direct conversion to diamond.
- diamond powder is directly sintered by a solid-phase reaction. At this time, since boron dissolved in the starting material is taken into the lattice sites of diamond, the boron becomes a P-type semiconductor and conductivity is generated.
- the particle size of this polycrystal is at most 100,000 nm or less, or the average particle size is 5000 ⁇ . m, more preferably a maximum particle size of 100 nm or less, and an average particle size of 500 nm or less, having a fine and homogeneous structure. Furthermore, the particles are very strongly bonded by the catalytic reaction of boron. For this reason, this polycrystal has a hardness of 80 GPa or more, and in some cases, 11 OGPa or more, which is higher than that of a diamond single crystal. In addition, since it does not contain a metal catalyst or a sintering aid, no graphitization or generation of fine cracks is observed even at 1400 ° C. in a vacuum, for example.
- the polycrystalline diamond of the present invention can be manufactured and processed at low cost, which is extremely useful as a tool such as cutting knots, dressers, dies, and drill bits, etc. .
- Amorphous boron powder is added to graphite with a particle size of 10-60 ⁇ m and a purity of 99.95% or more so that the amount of boron with respect to carbon is 0.1-0.001 at%.
- the ball was placed in a silicon nitride pot together with the silicon balls, and mechanically pulverized in a highly purified argon gas at 500 rpm using a planetary ball mill.
- Various samples were prepared by changing the grinding time to 120 hours. After grinding, samples were collected in a glove box filled with high-purity argon gas.
- the particle size of the pulverized sample is examined by SEM or TEM observation, and the average particle size (crystallite size) is calculated from the half-width of the (002) diffraction line of the X-ray diffraction pattern according to Scherrer's formula. I asked.
- Each of the samples was filled in a Mo capsule in the glove box, sealed, and treated with a belt-type ultrahigh-pressure generator under various pressure and temperature conditions for 30 minutes.
- the product phase of the obtained sample was identified by X-ray diffraction, and the particle size of the constituent particles was examined by TEM observation.
- the surface of the strongly sintered sample was polished to a mirror surface, and the hardness on the polished surface was measured with a micro-noop hardness tester.
- Table 1 shows the results of the experiment. From these results, if the starting material is fine boron-containing graphite, which has been pulverized to a maximum particle size of less than 100 nm or an average particle size of 50 nm or less, it is converted to diamond under relatively mild high-pressure and high-temperature conditions, and is obtained.
- the hardness of the polycrystalline body is much higher than that of the conventional sintered body of Co binder (60-80GPa). It is high and is equal to or greater than that of diamond single crystal (85-1 lOGPa).
- the polycrystalline body containing boron in an amount of lOppm or more showed conductivity, the electric conductivity was 10 ⁇ cm or less, and the discharge power was at a level capable of discharging.
- amorphous carbons containing boron as a solid solution, graphite, and CVD synthetic diamond powder were used as starting materials. These are filled in a Mo capsule, sealed, and this is Using a generator, treatment was carried out for 30 minutes under various pressure and temperature conditions. The product phase of the obtained sample was identified by X-ray diffraction, and the particle size of the constituent particles was examined by TEM observation. The surface was polished to a mirror surface, and the hardness on the polished surface was measured with a Micro Knoop hardness meter. Table 2 shows the results of the experiment. The obtained sample was a polycrystal composed of diamond.
- the polycrystal of the present invention has excellent mechanical properties and thermal stability, and Since the electric power has the conductivity that can be obtained, it can be produced at low cost, and is useful for tools such as cutting knots, dressers, dies, and industrial applications such as drill bits.
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Priority Applications (4)
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US10/582,330 US8226922B2 (en) | 2003-12-11 | 2004-12-03 | High-hardness conductive diamond polycrystalline body and method of producing the same |
JP2005516815A JP5028800B2 (ja) | 2003-12-11 | 2004-12-03 | 高硬度導電性ダイヤモンド多結晶体およびその製造方法 |
EP04821003.3A EP1704913B1 (en) | 2003-12-11 | 2004-12-03 | High-hardness conductive diamond polycrystalline body and method for producing same |
US13/528,511 US9192899B2 (en) | 2003-12-11 | 2012-06-20 | High-hardness conductive diamond polycrystalline body and method of producing the same |
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US10/582,330 A-371-Of-International US8226922B2 (en) | 2003-12-11 | 2004-12-03 | High-hardness conductive diamond polycrystalline body and method of producing the same |
US13/528,511 Continuation US9192899B2 (en) | 2003-12-11 | 2012-06-20 | High-hardness conductive diamond polycrystalline body and method of producing the same |
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US (2) | US8226922B2 (ja) |
EP (2) | EP1704913B1 (ja) |
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JP2007238411A (ja) * | 2006-03-10 | 2007-09-20 | Naoki Komatsu | ナノダイヤモンド |
JP2008180568A (ja) * | 2007-01-24 | 2008-08-07 | Sumitomo Electric Ind Ltd | ダイヤモンド圧子 |
CN103752220A (zh) * | 2008-02-06 | 2014-04-30 | 住友电气工业株式会社 | 多晶金刚石 |
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JP2012066979A (ja) * | 2010-09-27 | 2012-04-05 | Sumitomo Electric Ind Ltd | 高硬度導電性ダイヤモンド多結晶体およびその製造方法 |
JP2013245127A (ja) * | 2012-05-24 | 2013-12-09 | Sumitomo Electric Ind Ltd | 多結晶ダイヤモンド砥粒およびその製造方法、スラリー、ならびに固定砥粒式ワイヤ |
JP2013245128A (ja) * | 2012-05-24 | 2013-12-09 | Sumitomo Electric Ind Ltd | 多結晶ダイヤモンド砥粒およびその製造方法、スラリー、ならびに固定砥粒式ワイヤ |
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US9487446B2 (en) | 2012-12-06 | 2016-11-08 | Sumitomo Electric Industries, Ltd. | Diamond polycrystalline body and method for manufacturing the same, and tool |
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JP2015143171A (ja) * | 2013-12-24 | 2015-08-06 | トーメイダイヤ株式会社 | 制御された導電性/電気抵抗を有するダイヤモンド及びその製法 |
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CN110023238B (zh) * | 2016-11-30 | 2022-10-25 | 住友电气工业株式会社 | 多晶金刚石及其制法 |
WO2022259510A1 (ja) | 2021-06-11 | 2022-12-15 | 住友電工ハードメタル株式会社 | ダイヤモンド多結晶体、及びダイヤモンド多結晶体を備える工具 |
WO2022259509A1 (ja) | 2021-06-11 | 2022-12-15 | 住友電工ハードメタル株式会社 | ダイヤモンド多結晶体、及びダイヤモンド多結晶体を備える工具 |
WO2022259508A1 (ja) | 2021-06-11 | 2022-12-15 | 住友電工ハードメタル株式会社 | 複合多結晶体、及び複合多結晶体を備える工具 |
Also Published As
Publication number | Publication date |
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US8226922B2 (en) | 2012-07-24 |
EP2641868A2 (en) | 2013-09-25 |
US9192899B2 (en) | 2015-11-24 |
EP1704913A1 (en) | 2006-09-27 |
EP2641868B1 (en) | 2018-04-11 |
JP2012106925A (ja) | 2012-06-07 |
EP1704913B1 (en) | 2016-05-18 |
JP5028800B2 (ja) | 2012-09-19 |
US20080022806A1 (en) | 2008-01-31 |
US20120255236A1 (en) | 2012-10-11 |
EP1704913A4 (en) | 2009-02-11 |
EP2641868A3 (en) | 2014-08-27 |
JP5435043B2 (ja) | 2014-03-05 |
JPWO2005065809A1 (ja) | 2007-07-26 |
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