JPS62269701A - Method for synthesizing needle-like diamond particle - Google Patents
Method for synthesizing needle-like diamond particleInfo
- Publication number
- JPS62269701A JPS62269701A JP61113234A JP11323486A JPS62269701A JP S62269701 A JPS62269701 A JP S62269701A JP 61113234 A JP61113234 A JP 61113234A JP 11323486 A JP11323486 A JP 11323486A JP S62269701 A JPS62269701 A JP S62269701A
- Authority
- JP
- Japan
- Prior art keywords
- diamond
- catalyst
- graphite
- carbon raw
- carbon
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000010432 diamond Substances 0.000 title claims abstract description 38
- 229910003460 diamond Inorganic materials 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims description 17
- 239000002245 particle Substances 0.000 title claims description 13
- 230000002194 synthesizing effect Effects 0.000 title claims description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 46
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 34
- 239000003054 catalyst Substances 0.000 claims abstract description 27
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 26
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 20
- 239000010439 graphite Substances 0.000 claims abstract description 20
- 239000002994 raw material Substances 0.000 claims abstract description 20
- 229910052742 iron Inorganic materials 0.000 claims abstract description 16
- 239000000956 alloy Substances 0.000 claims abstract description 9
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 9
- 238000010000 carbonizing Methods 0.000 claims abstract description 5
- 238000010438 heat treatment Methods 0.000 claims abstract description 5
- 230000015572 biosynthetic process Effects 0.000 claims description 6
- 238000003786 synthesis reaction Methods 0.000 claims description 6
- 230000005496 eutectics Effects 0.000 claims description 5
- 229920000620 organic polymer Polymers 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 3
- 229910003481 amorphous carbon Inorganic materials 0.000 claims 1
- 239000012808 vapor phase Substances 0.000 claims 1
- XPFVYQJUAUNWIW-UHFFFAOYSA-N furfuryl alcohol Chemical compound OCC1=CC=CO1 XPFVYQJUAUNWIW-UHFFFAOYSA-N 0.000 abstract description 12
- 150000003839 salts Chemical class 0.000 abstract description 6
- 239000000203 mixture Substances 0.000 abstract description 4
- 238000009833 condensation Methods 0.000 abstract description 2
- 230000005494 condensation Effects 0.000 abstract description 2
- 230000018044 dehydration Effects 0.000 abstract description 2
- 238000006297 dehydration reaction Methods 0.000 abstract description 2
- 239000000463 material Substances 0.000 abstract description 2
- 239000002861 polymer material Substances 0.000 abstract description 2
- 238000001308 synthesis method Methods 0.000 abstract description 2
- 241000286904 Leptothecata Species 0.000 abstract 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 abstract 1
- 239000005539 carbonized material Substances 0.000 abstract 1
- 229910017604 nitric acid Inorganic materials 0.000 abstract 1
- 239000002184 metal Substances 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000013078 crystal Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000007789 gas Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 150000001247 metal acetylides Chemical class 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 229910052697 platinum Inorganic materials 0.000 description 2
- 239000003575 carbonaceous material Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005087 graphitization Methods 0.000 description 1
- 229910052735 hafnium Inorganic materials 0.000 description 1
- 229910052741 iridium Inorganic materials 0.000 description 1
- 229910052745 lead Inorganic materials 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 150000002825 nitriles Chemical class 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229910052762 osmium Inorganic materials 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000002296 pyrolytic carbon Substances 0.000 description 1
- 229910052703 rhodium Inorganic materials 0.000 description 1
- 229910052707 ruthenium Inorganic materials 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J3/00—Processes of utilising sub-atmospheric or super-atmospheric pressure to effect chemical or physical change of matter; Apparatus therefor
- B01J3/06—Processes using ultra-high pressure, e.g. for the formation of diamonds; Apparatus therefor, e.g. moulds or dies
- B01J3/062—Processes using ultra-high pressure, e.g. for the formation of diamonds; Apparatus therefor, e.g. moulds or dies characterised by the composition of the materials to be processed
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2203/00—Processes utilising sub- or super atmospheric pressure
- B01J2203/06—High pressure synthesis
- B01J2203/0605—Composition of the material to be processed
- B01J2203/061—Graphite
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2203/00—Processes utilising sub- or super atmospheric pressure
- B01J2203/06—High pressure synthesis
- B01J2203/065—Composition of the material produced
- B01J2203/0655—Diamond
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2203/00—Processes utilising sub- or super atmospheric pressure
- B01J2203/06—High pressure synthesis
- B01J2203/0675—Structural or physico-chemical features of the materials processed
- B01J2203/068—Crystal growth
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Carbon And Carbon Compounds (AREA)
Abstract
Description
【発明の詳細な説明】
３、発明の詳細な説明
産業上の利用分野
本発明は樹脂ボンド砥石、深針用材料として有用な針状
ダイヤモンドの合成方法に関する。Detailed Description of the Invention 3. Detailed Description of the Invention Field of Industrial Application The present invention relates to a method for synthesizing acicular diamond useful as a material for resin-bonded grindstones and deep needles.
本発明において言う針状ダイヤモンドとは、短軸に対す
る長軸の比が少なくとも２以上で、特定の結晶学方向に
伸びたダイヤモンド粒子を言う。The term "acicular diamond" used in the present invention refers to diamond particles having a long axis to short axis ratio of at least 2 and extending in a specific crystallographic direction.
従来技術
ダイヤモンドの合成方法は種々知られているが、その代
表的なものとしては、例えば特公昭３７−４４０７、号
がある。BACKGROUND OF THE INVENTION Various methods for synthesizing diamond are known, and a typical one is disclosed in Japanese Patent Publication No. 37-4407.
この方法は周期律表■族（Ｆｅ、Ｃｏ、Ｎｉ。This method applies to Group II of the periodic table (Fe, Co, Ni).
Ｒｕ、Ｒｈ、Ｒｄ、Ｏｓ、Ｉｒ、Ｐｔ）に属する元素あ
るいはＣｒ、Ｔａ、Ｍｎまたはこれを含む合金を触媒と
してグラファイトと共存させ、１２００℃以上、ダイヤ
モンド安定力下に保持してダイヤモンドを析出させる方
法である。この方法で得られるダイヤモンド粒子の形態
は（１１１）と（１００）面で構成された塊状の６−８
面体かあるいは不規則形状の粒子であり、針状ダイヤモ
ンドは合成できなかった。An element belonging to the group Ru, Rh, Rd, Os, Ir, Pt) or Cr, Ta, Mn or an alloy containing these is used as a catalyst to coexist with graphite and held at 1200°C or higher under diamond stabilizing force to precipitate diamond. It's a method. The morphology of the diamond particles obtained by this method is a block-like 6-8 composed of (111) and (100) planes.
Acicular diamonds could not be synthesized because they were faceted or irregularly shaped particles.
従来、針状ダイヤモンドの合成としては、ダイヤモンド
の原料となる炭素質物質とダイヤモンドを晶出させる触
媒金属とを積層もしくは同心円状に配置し、その両者の
界面にダイヤモンド合成に不活性な金属例えばＡｕ、Ａ
ｇ、Ｃｕ、Ｐｔ。Conventionally, acicular diamonds have been synthesized by stacking or concentrically arranging a carbonaceous material that is a raw material for diamonds and a catalyst metal that crystallizes diamonds, and adding a metal that is inert to diamond synthesis, such as Au, to the interface between the two. ,A
g, Cu, Pt.
Ｔｉ、Ｚｒ、Ｈｆ、ＡＩ、Ｚｎ、Ｓｎ、Ｐｂ。Ti, Zr, Hf, AI, Zn, Sn, Pb.
Ｖ、 Ｎ ｂ 、 Ｔ ａ 、 Ｍ ｏ 、 Ｗを介在
させ圧力下に加熱する方法（特開昭５５−１６７１１７
号公報）が知られている。該方法は不活性金属で共晶温
度を上げ、融液の浸入を助長させるとするものであり、
従って圧力を６５ｋｂ以上、温度を使用触媒と炭素の共
晶温度よりも２００℃以上高い温度を必要とした。A method of heating under pressure with V, Nb, Ta, Mo, W interposed (Japanese Patent Application Laid-Open No. 55-167117
Publication No.) is known. This method uses an inert metal to raise the eutectic temperature and promote the penetration of the melt,
Therefore, the pressure was required to be 65 kb or more, and the temperature was required to be 200° C. or more higher than the eutectic temperature of the catalyst and carbon used.
発明の目的
本発明は前記の問題点を解消すべくなされたもので、そ
の目的は炭素質原料と触媒の界面にダイヤモンドの合成
に不活性な金属を介在させることなく、かつ、圧力、温
度をより低くて針状ダイヤモンドを合成する方法を提供
するにある。Purpose of the Invention The present invention has been made to solve the above-mentioned problems, and its purpose is to eliminate the presence of metals that are inert to diamond synthesis at the interface between the carbonaceous raw material and the catalyst, and to reduce pressure and temperature. The purpose of the present invention is to provide a method for synthesizing lower and acicular diamonds.
発明の構成
本発明者らは前記目的を達成すべく鋭意研究の結果、炭
素質原料として、有機高分子物質を還元性雰囲気中で加
熱炭化して得られた炭素または気相合成法によるパイロ
リティック黒鉛を使用し、触媒として鉄を７５重量％以
上含む合金または純鉄を使用すると、従来法よりも低圧
、低温で容易に針状ダイヤモンドを合成し得られること
を究明し得た。この知見に基いて本発明を完成した。Structure of the Invention As a result of intensive research to achieve the above object, the present inventors have found that, as a carbonaceous raw material, carbon obtained by heating and carbonizing an organic polymer substance in a reducing atmosphere or pyrolytic carbon obtained by a gas phase synthesis method. It has been found that by using graphite and an alloy containing 75% by weight or more of iron or pure iron as a catalyst, acicular diamond can be easily synthesized at lower pressure and lower temperature than conventional methods. The present invention was completed based on this knowledge.
本発明の要旨は
炭素原料と触媒を相互に接触するように、両者を積層ま
たは同心円状に配置し、炭素と触媒の共晶温度以上で、
ダイヤモンドと黒鉛の平衡線以上の圧力の下でダイヤモ
ンドを合成する方法におい成性によるパイロリティック
黒鉛を使用し、触媒として鉄を７５重量％以上含む合金
または純鉄を使用することを特徴とする針状ダイヤモン
ド粒子の合成方法、にある。The gist of the present invention is to arrange a carbon raw material and a catalyst in a layered manner or concentrically so that they are in contact with each other, and at a temperature higher than the eutectic temperature of the carbon and catalyst.
A needle characterized in that a method for synthesizing diamond under a pressure equal to or higher than the equilibrium line of diamond and graphite uses pyrolitic graphite formed by synthesis, and an alloy containing 75% by weight or more of iron or pure iron is used as a catalyst. A method for synthesizing shaped diamond particles.
本発明の方法においては、炭素原料として有機り黒鉛を
使用し、触媒として鉄を７５重量％以上含む合金または
純鉄を組合せ使用することが必要である。前記炭素を使
用し、触媒としてＦｅよりも炭化物が安定なＭｎ、Ｃｒ
を触媒を使用すると針状ダイヤモンドは得られず、また
、Ｆｅよりも炭化物が不安定なＣｏ、Ｎｉを使用しても
針状ダイヤモンドは得られない。In the method of the present invention, it is necessary to use organic graphite as a carbon raw material and an alloy containing 75% by weight or more of iron or pure iron as a catalyst in combination. Using the above-mentioned carbon, Mn and Cr, whose carbides are more stable than Fe, are used as catalysts.
Needle-shaped diamonds cannot be obtained if a catalyst is used, and needle-shaped diamonds cannot be obtained even if Co or Ni, whose carbides are more unstable than Fe, are used.
また触媒として鉄を７５％以上含む合金または純鉄を使
用し、炭素原料として普通の黒鉛を使用すると、針状ダ
イヤモンドは得られないか、得られても５％以下と僅少
である。Furthermore, if an alloy containing 75% or more of iron or pure iron is used as a catalyst and ordinary graphite is used as a carbon raw material, needle-like diamonds cannot be obtained, or even if they are obtained, the amount is as small as 5% or less.
本発明の方法により得られる針状ダイヤモンド粒子の１
例を示すと第１図の通りである。この針状ダイヤモンド
粒子は長軸１２００μｍ、短軸２００μｍ、長／短軸比
は６であり、長軸方向はほぼ＜１００＞に平行である。1 of acicular diamond particles obtained by the method of the present invention
An example is shown in FIG. This acicular diamond particle has a long axis of 1200 μm, a short axis of 200 μm, a long/short axis ratio of 6, and the long axis direction is approximately parallel to <100>.
このように長軸方向が配向する理由は詳細には明らかで
ないが、原料と触媒との界面に微細なダイヤモンドが析
出し、その間から針状晶が伸び、この場合界面の析出結
晶が一様でないと収率よく針状晶が得られない。この析
出結晶を一様にするのに鉄触媒が適当であると考えられ
る。炭素原料としては有機高分子物質を還元性雰囲気中
で加熱炭化したもの、またはメタンガスを気相分解した
パイロリティック黒鉛が使用される。炭素原料を生成す
る有機高分子物質としては、ヂビニルヘンゼンポリマー
、ポリアセチルニトリル、フルフリルアルコール縮合物
等が挙げられる。使用する炭素の密度は１．２〜２．２
ｇ／ｃｃであることが好ましい。黒鉛化度は特に影響が
ない。The reason why the long axis is oriented in this way is not clear in detail, but fine diamonds are precipitated at the interface between the raw material and the catalyst, and needle-shaped crystals extend from between them, and in this case, the precipitated crystals at the interface are not uniform. Needle crystals cannot be obtained in good yield. It is believed that an iron catalyst is suitable for making the precipitated crystals uniform. As the carbon raw material, an organic polymer material obtained by heating and carbonizing in a reducing atmosphere, or pyrolytic graphite obtained by decomposing methane gas in the gas phase is used. Examples of organic polymer substances that produce carbon raw materials include divinylhensen polymer, polyacetyl nitrile, furfuryl alcohol condensate, and the like. The density of carbon used is 1.2 to 2.2
g/cc is preferred. The degree of graphitization has no particular effect.
触媒は純鉄が最も好ましいが、Ｆｅが７５重量％以上を
含む合金でも収率よく針状ダイヤモンドが得られる。Ｆ
ｅが５０重量％より針状ダイヤモンドが合成されるが、
収率が悪く、収率よく得るためには７５重量％以上であ
ることが必要である。The catalyst is most preferably pure iron, but even alloys containing 75% by weight or more of Fe can yield acicular diamonds in good yield. F
Acicular diamond is synthesized when e is 50% by weight.
The yield is poor, and in order to obtain a good yield, it is necessary to have a content of 75% by weight or more.
合成温度及び圧力は、炭素と触媒の共晶温度以上で、ダ
イヤモンドと黒鉛の平衡線以上の圧力であればよく特に
高温、高圧であることを必要としない。The synthesis temperature and pressure need only be above the eutectic temperature of carbon and catalyst and above the equilibrium line of diamond and graphite, and do not need to be particularly high temperature or pressure.
実施例１゜
試料構成を第２図に示す。図中１は黒鉛ヒーター、２は
黒鉛端板、３と４はヒーターと試料とを絶縁するための
食塩板と食塩管、５は炭素原料。Example 1 The sample structure is shown in FIG. In the figure, 1 is a graphite heater, 2 is a graphite end plate, 3 and 4 are a salt plate and salt pipe for insulating the heater and the sample, and 5 is a carbon raw material.
６は触媒を示す。6 represents a catalyst.
炭素原料５として、フルフリルアルコールを６０℃で１
％ＨＮＯｆｆを加え、脱水縮合させたものを、窒素中で
１０００℃で４時間炭化し、径７ｍ、厚さ１詣の円板に
打抜き、さらに真空中（〜Ｉ Ｘｉ ０−５Ｔｏｒｒ）
で１８００℃で３時間処理したものを用いた。As the carbon raw material 5, furfuryl alcohol was added at 60°C.
%HNoff was added and the resulting dehydration condensation was carbonized in nitrogen at 1000°C for 4 hours, punched into a disk with a diameter of 7 m and a thickness of 1 mm, and further in vacuum (~I Xi 0-5 Torr).
The sample was treated at 1800°C for 3 hours.
また触媒として純鉄を径７龍、厚さ１鶴の円板を用いた
。これらを第２図のように構成し、５８キロバール、
１４３０℃で１２分間処理した。これにより大部分が針
状ダイヤモンド粒子からなり、長軸の長さ１０００〜１
５００ｕｍ 、短軸の長さ２００〜３００μｍのダイヤ
モンド粒子が得られた。これら粒子の配向性をプリセツ
ション写真で調べたところ、長軸の方向は＜１００＞に
ほぼ平行であった。In addition, a pure iron disk with a diameter of 7 mm and a thickness of 1 mm was used as a catalyst. These are configured as shown in Figure 2, and the pressure is 58 kilobar,
It was treated at 1430°C for 12 minutes. As a result, most of the diamond particles are acicular, with a long axis length of 1000 to 1
Diamond particles with a diameter of 500 um and a short axis length of 200 to 300 um were obtained. When the orientation of these particles was examined using preset photographs, the direction of the long axis was almost parallel to <100>.
実施例２゜
実施例１と同じ試料構成で、炭素原料の種類のみを変更
し、５８キロバール、 １４５０℃で１５分間処理した
。その結果は次の第１表の通りであった。Example 2 The sample composition was the same as in Example 1, only the type of carbon raw material was changed, and the sample was treated at 58 kbar and 1450° C. for 15 minutes. The results were as shown in Table 1 below.
第 １ 表
パイロリティック黒鉛 ９７％
比較例
市販高結晶質黒鉛 ０％
市販炭素賞黒鉛 ０〜５％実施例３゜
実施例１と同じ試料構成で、実施例１に記載したフルフ
リルアルコール縮金物由来の炭素を使用し、触媒を変え
て、圧力５８キロバール、 １４７０℃で１５分間処理
した。その結果は次の第２表の通りであった。Table 1 Pyrolytic graphite 97% Comparative example Commercially available high crystalline graphite 0% Commercially available carbon prize graphite 0-5% Example 3 Same sample composition as Example 1, derived from the furfuryl alcohol condensate described in Example 1 of carbon was used and the catalyst was changed and treated at 1470° C. for 15 minutes at a pressure of 58 kbar. The results are shown in Table 2 below.
第 ２ 表
Ｆｅ９０ Ｎｉ１Ｏ７５％
Ｆｅ７５ Ｎｉ２５ ７０％
比較例
Ｆ ｅ７０． Ｎ ｉ１５． Ｃｏ１５ ３５％Ｆ
ｅ６４．Ｎｉ３６ ２５％Ｆｅ５０．Ｎｉ
５０ ５％Ｃｒ７０． Ｎ ｉ３０
０％Ｍｎ７０．Ｎｉ３０
０％全発明効果
実施例が示すように、本発明の方法によると、従来法に
おけるような、炭素原料と触媒との界面にダイヤモンド
の合成に不活性な金属を介在させることなく、比較的低
圧力、低温度で容易に収率よく針状ダイヤモンド粒子を
合成し得られる優れた効果を奏し得られる。Table 2 Fe90 Ni1O75% Fe75 Ni25 70% Comparative example F e70. Ni15. Co15 35%F
e64. Ni36 25%Fe50. Ni
50 5%Cr70. Ni30
0%Mn70. Ni30
0% total invention effect As shown in the examples, the method of the present invention does not require the presence of metals that are inactive in diamond synthesis at the interface between the carbon raw material and the catalyst, as in the conventional method, and the effect of the invention is relatively low. Acicular diamond particles can be easily synthesized in high yield under pressure and low temperature, and excellent effects can be obtained.
第１図は本発明の方法で得られる針状ダイヤモンド粒子
の一例の写真、第２図は試料構成の一実施態様図である
。
ｌ：黒鉛ヒーター、 ２：黒鉛端板、３．４＝ヒー
ターと試料とを絶縁するための食塩板と食塩管、
５：炭素原料、 ６：触媒。FIG. 1 is a photograph of an example of acicular diamond particles obtained by the method of the present invention, and FIG. 2 is a diagram of an embodiment of the sample structure. 1: Graphite heater, 2: Graphite end plate, 3.4 = Salt plate and salt pipe for insulating the heater and sample, 5: Carbon raw material, 6: Catalyst.
Claims (1)
層または同心円状に配置し、炭素と触媒の共晶温度以上
で、ダイヤモンドと黒鉛の平衡線以上の圧力の下でダイ
ヤモンドを合成する方法において、炭素原料として、有
機高分子物質を還元性雰囲気中で加熱炭化して得られた
非晶質炭素または気相合成法によるパイロリティック黒
鉛を使用し、触媒として鉄を７５重量％以上含む合金ま
たは純鉄を使用することを特徴とする針状ダイヤモンド
粒子の合成方法。1) A carbon raw material and a catalyst are arranged in layers or concentrically so that they are in contact with each other, and diamond is synthesized at a temperature higher than the eutectic temperature of carbon and the catalyst and a pressure higher than the equilibrium line of diamond and graphite. In the method, amorphous carbon obtained by heating and carbonizing an organic polymer substance in a reducing atmosphere or pyrolytic graphite obtained by vapor phase synthesis is used as a carbon raw material, and contains 75% by weight or more of iron as a catalyst. A method for synthesizing acicular diamond particles characterized by using alloy or pure iron.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61113234A JPS62269701A (en) | 1986-05-16 | 1986-05-16 | Method for synthesizing needle-like diamond particle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61113234A JPS62269701A (en) | 1986-05-16 | 1986-05-16 | Method for synthesizing needle-like diamond particle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62269701A true JPS62269701A (en) | 1987-11-24 |
| JPH0521019B2 JPH0521019B2 (en) | 1993-03-23 |
Family
ID=14606965
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61113234A Granted JPS62269701A (en) | 1986-05-16 | 1986-05-16 | Method for synthesizing needle-like diamond particle |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62269701A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2469781C1 (en) * | 2011-04-28 | 2012-12-20 | Игорь Владимирович Федосеев | Method of obtaining diamond whiskers |
| CN108658596A (en) * | 2018-04-28 | 2018-10-16 | 深圳市赛普戴蒙德科技有限公司 | graphite sheet and its manufacturing method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59164609A (en) * | 1983-03-11 | 1984-09-17 | Showa Denko Kk | Method for synthesizing diamond |
-
1986
- 1986-05-16 JP JP61113234A patent/JPS62269701A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59164609A (en) * | 1983-03-11 | 1984-09-17 | Showa Denko Kk | Method for synthesizing diamond |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2469781C1 (en) * | 2011-04-28 | 2012-12-20 | Игорь Владимирович Федосеев | Method of obtaining diamond whiskers |
| CN108658596A (en) * | 2018-04-28 | 2018-10-16 | 深圳市赛普戴蒙德科技有限公司 | graphite sheet and its manufacturing method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0521019B2 (en) | 1993-03-23 |
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