JPH11246271A - Cubic boron nitride sintered body and its production - Google Patents
Cubic boron nitride sintered body and its productionInfo
- Publication number
- JPH11246271A JPH11246271A JP10064709A JP6470998A JPH11246271A JP H11246271 A JPH11246271 A JP H11246271A JP 10064709 A JP10064709 A JP 10064709A JP 6470998 A JP6470998 A JP 6470998A JP H11246271 A JPH11246271 A JP H11246271A
- Authority
- JP
- Japan
- Prior art keywords
- boron nitride
- sintered body
- cubic boron
- strength
- cbn
- 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.)
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Links
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- Cutting Tools, Boring Holders, And Turrets (AREA)
- Ceramic Products (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は立方晶窒化ホウ素
（ｃＢＮ）焼結体およびその製造方法に関するもので、
特に鉄系材料の切削加工に有用な、高温下でも強度が低
下しないｃＢＮ焼結体に関する。The present invention relates to a cubic boron nitride (cBN) sintered body and a method for producing the same.
Particularly, the present invention relates to a cBN sintered body that is useful for cutting iron-based materials and does not decrease in strength even at high temperatures.
【０００２】[0002]
【従来の技術】ｃＢＮは、ダイヤモンドに次ぐ硬度を有
し、熱的化学的安定性の高い物質であり、従来より鉄系
材料の切削工具として用いられている。現在、切削工具
として用いられているｃＢＮ焼結体は、ｃＢＮの粉末
を、ＴｉＮ、ＴｉＣ、Ｃｏなどのバインダーを用いて超
高圧下で焼結されたもので、焼結体には１０〜４０体積
％程度のバインダーが含まれる。このバインダーが、焼
結体の強度、耐熱性、熱放散性に大きく影響を与え、特
に鉄系材料を高速で切削加工する場合に、刃先の欠損や
亀裂が生じやすく、工具としての寿命が非常に短くな
る。焼結体にバインダーが含まれている限り、このよう
な問題はさけられない。2. Description of the Related Art cBN is a material having the second highest hardness next to diamond and having high thermochemical stability, and has been conventionally used as a cutting tool for iron-based materials. The cBN sintered body currently used as a cutting tool is obtained by sintering cBN powder under an ultra-high pressure using a binder such as TiN, TiC, and Co. A volume% binder is included. This binder greatly affects the strength, heat resistance, and heat dissipation of the sintered body.Especially when cutting ferrous materials at high speed, the cutting edge is liable to chip or crack, and the tool life is extremely short. Becomes shorter. As long as the sintered body contains a binder, such a problem cannot be avoided.
【０００３】一方、バインダーを含まないｃＢＮ焼結体
として、ホウ窒化マグネシウムなどの触媒を用いて六方
晶窒化ホウ素（ｈＢＮ）を原料として、反応焼結させた
焼結体がある。この焼結体はバインダーがなくｃＢＮ粒
子が強く結合しているため熱伝導率が６〜７Ｗ／ｃｍ℃
と高く、ヒートシンク材やＴＡＢボンディングツールな
どに用いられている。しかし、この焼結体の中には触媒
がいくらか残留しているため、熱を加えるとこの触媒と
ｃＢＮとの熱膨張差による微細クラックが入りやすい。
このため、その耐熱温度は７００℃程度と低く、切削工
具としては大きな問題となる。また、粒径が１０μｍ前
後と大きいため、熱伝導率が高いものの、強度が十分で
なく、負荷の大きい切削には対応出来ない。On the other hand, as a cBN sintered body containing no binder, there is a sintered body obtained by reaction sintering using hexagonal boron nitride (hBN) as a raw material using a catalyst such as magnesium boronitride. This sintered body has no binder and has cBN particles strongly bonded, and thus has a thermal conductivity of 6 to 7 W / cm ° C.
It is used for heat sink materials and TAB bonding tools. However, since some catalyst remains in the sintered body, when heat is applied, fine cracks tend to occur due to the difference in thermal expansion between the catalyst and cBN.
Therefore, its heat-resistant temperature is as low as about 700 ° C., which is a serious problem as a cutting tool. Further, since the particle size is as large as about 10 μm, the thermal conductivity is high, but the strength is not sufficient, and it is not possible to cope with cutting with a large load.
【０００４】他方、ｃＢＮは、ｈＢＮなどの常圧型ＢＮ
を超高圧高温下で、無触媒で合成（直接変換）すること
が可能である。このｈＢＮ→ｃＢＮ変換と同時に焼結さ
せることで、バインダーを含まないｃＢＮ焼結体を作製
できることが知られている。たとえば、特開昭４７−３
４０９９号や特開平３−１５９９６４号にｈＢＮを超高
圧高温下でｃＢＮに変換させ、ｃＢＮ焼結体を得る方法
が示されている。On the other hand, cBN is a normal pressure type BN such as hBN.
Can be synthesized (direct conversion) under ultrahigh pressure and high temperature without a catalyst. It is known that a cBN sintered body containing no binder can be produced by sintering simultaneously with the hBN → cBN conversion. For example, JP-A-47-3
No. 4099 and JP-A-3-159964 disclose a method of converting hBN into cBN under ultra-high pressure and high temperature to obtain a cBN sintered body.
【０００５】また、特公昭６３−３９４号や特開平８−
４７８０１号には熱分解窒化ホウ素（ｐＢＮ）を原料に
して、ｃＢＮ焼結体を作製する方法が示されている。こ
れらは、７ＧＰａ、２１００℃以上の厳しい圧力温度条
件が必要である。Further, Japanese Patent Publication No. 63-394 and Japanese Patent Application Laid-Open No.
No. 47801 discloses a method for producing a cBN sintered body using pyrolytic boron nitride (pBN) as a raw material. These require severe pressure and temperature conditions of 7 GPa and 2100 ° C. or higher.
【０００６】よりマイルドな条件で直接変換によりｃＢ
Ｎを得る方法として例えば、特公昭４９−２７５１８号
に、一次粒子の平均粒径が３μｍ以下の六方晶系窒化ホ
ウ素を原料とする方法が示されている。これにより６Ｇ
Ｐａ、１１００℃の条件でｃＢＮが得られる。しかし、
六方晶窒化ホウ素が微粉であるため、数％の酸化ホウ素
不純物や吸着ガスを含み、そのため焼結が十分に進行せ
ず、また、酸化物を焼結体内に多く含むため、高硬度、
高強度で耐熱性に優れた焼結体が得られず、切削工具に
用いることができない。[0006] cB by the direct conversion under milder conditions
As a method for obtaining N, for example, Japanese Patent Publication No. 49-27518 discloses a method using hexagonal boron nitride having an average primary particle size of 3 μm or less as a raw material. This allows 6G
CBN is obtained under the conditions of Pa and 1100 ° C. But,
Since hexagonal boron nitride is a fine powder, it contains a few percent of boron oxide impurities and adsorbed gas, so that sintering does not proceed sufficiently, and since a large amount of oxide is contained in the sintered body, high hardness,
A sintered body having high strength and excellent heat resistance cannot be obtained, and cannot be used for a cutting tool.
【０００７】[0007]
【発明が解決しようとする課題】上記のｈＢＮなどの常
圧型ＢＮを超高圧高温下で、無触媒で直接変換焼結され
たｃＢＮ焼結体は、切削工具としてある程度使用可能で
あるが、８００℃以上の高温下での強度が十分でなく、
高速で、負荷の大きい切削条件では、切削中の刃先のチ
ッピングが問題であった。従来のバインダーを含むｃＢ
Ｎ焼結体も、高温下で強度が大幅に低下する。The cBN sintered body obtained by directly converting the normal pressure type BN such as the above hBN and the like under non-catalyst under ultra-high pressure and high temperature can be used to some extent as a cutting tool. Insufficient strength at high temperatures above ℃
Under high-speed, high-load cutting conditions, chipping of the cutting edge during cutting has been a problem. CB containing conventional binder
The strength of the N sintered body also drops significantly at high temperatures.
【０００８】本発明者は上記のような問題を解決するた
め、先に特願平８−３１７６９９号により、ｈＢＮ→ｃ
ＢＮ直接変換、焼結を行うに当り、用いるｈＢＮを特定
することや、ｃＢＮ焼結体の結晶面間のＸ線回折強度比
を特定することを提案した。In order to solve the above problem, the present inventor has previously disclosed in Japanese Patent Application No. 8-317699 that hBN → c
In performing BN direct conversion and sintering, it was proposed to specify the hBN to be used and to specify the X-ray diffraction intensity ratio between crystal planes of the cBN sintered body.
【０００９】この提案は、同出願明細書に記載した要件
により、同明細書に記載した効果を奏するものである
が、更に試作研究を重ねた結果、新たな観点に立った次
項以下に示す発明に到達することができた。This proposal achieves the effects described in the specification in accordance with the requirements described in the specification of the same application. However, as a result of repeated trials and research, the invention described in the following paragraphs from a new viewpoint has been achieved. Could be reached.
【００１０】[0010]
【課題を解決するための手段】即ち本発明の第１の特徴
とするところは、ｃＢＮが９９．５体積％以上で、各ｃ
ＢＮ粒子同士が結合し、実質的にバインダーを含まず、
８００℃以上１４００℃以下の温度域で強度が低下しな
い特性を備えていることである。That is, the first feature of the present invention is that cBN is 99.5% by volume or more and each cBN is not less than 99.5% by volume.
BN particles are bonded to each other and contain substantially no binder,
It has a characteristic that the strength does not decrease in a temperature range of 800 ° C. or more and 1400 ° C. or less.
【００１１】そして、この特性はｃＢＮの粒子径が１μ
ｍ以下である場合に安定して得られ、更にｃＢＮ焼結体
中に圧縮型ｈＢＮ（compressed hBN）が０．０１〜０．
５体積％含まれることが最も好ましいということを確認
した。[0011] This characteristic is that the particle size of cBN is 1 μm.
m or less, and a stable hBN (compressed hBN) of 0.01 to 0.1 in the cBN sintered body is obtained.
It was confirmed that the content of 5% by volume was most preferable.
【００１２】また上記に基づいて試験の結果、上記特徴
を備えることにより、本発明のｃＢＮ焼結体は１０００
℃以上１４００℃以下の温度域においては、室温におけ
る強度より高い強度を示し得ると言う驚くべき知見を得
た。Further, as a result of the test based on the above, the cBN sintered body of the present invention is provided with the above-mentioned features, so that
In a temperature range of not less than 1 ° C. and not more than 1400 ° C., a surprising finding that the strength can be higher than that at room temperature has been obtained.
【００１３】本発明の別の特徴は、上記のような特性を
備えたｃＢＮ焼結体を安定して製造する方法を提供する
ことである。即ち酸化ホウ素やホウ酸などのホウ素と酸
素を含む化合物を炭素で還元窒化させた常圧型ＢＮを、
非酸化性雰囲気で加熱して高純度精製処理を施した後、
触媒を添加せず、圧力６〜７ＧＰａ、温度１５５０〜２
１００℃を加えて直接ｃＢＮに変換、焼結せしめること
である。Another feature of the present invention is to provide a method for stably producing a cBN sintered body having the above characteristics. That is, a normal pressure BN obtained by reducing and nitriding a compound containing boron and oxygen such as boron oxide or boric acid with carbon,
After performing high-purity purification treatment by heating in a non-oxidizing atmosphere,
No catalyst added, pressure 6-7 GPa, temperature 1550-2
That is, it is directly converted to cBN by applying 100 ° C. and sintered.
【００１４】[0014]
【作用】本発明のｃＢＮ焼結体は、構成するｃＢＮ粒子
同士の結合力、粒子径および未変換ｈＢＮ（圧縮型ｈＢ
Ｎとして焼結体内に残留）の残留量を制御することによ
り得られる。具体的には出発原料に高純度で微粒もしく
は低結晶性のｈＢＮを用い、粒成長の起こらない温度範
囲で変換焼結する。ここで用いる、低結晶性の常圧型Ｂ
Ｎは、酸化ホウ素やホウ酸を炭素や有機物で還元し、窒
化させて作製されたものが好ましい。The cBN sintered body of the present invention is characterized in that the bonding force between the constituent cBN particles, the particle size and the unconverted hBN (compressed hBN)
N in the sintered body). Specifically, conversion and sintering are performed in a temperature range in which grain growth does not occur, using high purity fine particles or low crystallinity hBN as a starting material. Low crystallinity normal pressure type B used here
N is preferably formed by reducing boron oxide or boric acid with carbon or an organic substance and nitriding the same.
【００１５】通常、常圧型ＢＮの合成方法として、酸化
ホウ素やホウ酸をアンモニアと反応させる方法が一般に
工業的に行われている。しかし、このようにして得られ
たＢＮは、高温で熱処理するとｈＢＮへ結晶化する。こ
のため、この方法により微細で低結晶性の常圧型ＢＮを
合成しても、不純物の酸化ホウ素を除去するための高温
精製処理（窒素ガス中２０５０℃以上、真空中１６５０
℃以上など）を行うと、ｈＢＮに結晶化、粒成長してし
まう。Usually, as a method of synthesizing normal pressure BN, a method of reacting boron oxide or boric acid with ammonia is generally industrially performed. However, the BN thus obtained is crystallized into hBN when heat-treated at a high temperature. For this reason, even if a fine and low-crystalline normal-pressure BN is synthesized by this method, high-temperature purification treatment (2050 ° C. or more in nitrogen gas, 1650
℃ or more), crystallization and grain growth of hBN occur.
【００１６】これに対し、酸化ホウ素やホウ酸を炭素で
還元窒化させた常圧型ＢＮは、高温で熱処理しても結晶
化しない特徴があり、したがって、この方法で微粒で低
結晶性の常圧型ＢＮを合成し、窒素ガス中２０５０℃以
上または真空中１６５０℃以上などの高純度精製処理を
行うことで、酸化ホウ素や吸着ガスのない直接変換焼結
に非常に適した常圧型ＢＮが得られる。On the other hand, a normal-pressure BN obtained by reducing and nitriding boron oxide or boric acid with carbon has a feature that it does not crystallize even when heat-treated at a high temperature. By synthesizing BN and performing high-purity purification treatment such as 2050 ° C. or more in nitrogen gas or 1650 ° C. or more in vacuum, an atmospheric pressure BN which is very suitable for direct conversion sintering without boron oxide or adsorption gas can be obtained. .
【００１７】本発明のｃＢＮ焼結体の合成（焼結）条件
は、圧力６〜７ＧＰａ、温度１５５０℃〜２１００℃が
好ましい。特に焼結温度が重要で、低いとｃＢＮへの変
換が十分でなく、高すぎるとｃＢＮの粒成長が進行し、
ｃＢＮ同士の結合力が小さくなる。ｃＢＮの粒成長の起
こらない焼結温度は、出発原料の結晶性、粒径により変
化する。The conditions for synthesizing (sintering) the cBN sintered body of the present invention are preferably a pressure of 6 to 7 GPa and a temperature of 1550 ° C. to 2100 ° C. In particular, the sintering temperature is important. If the sintering temperature is low, the conversion to cBN is not sufficient, and if it is too high, the grain growth of cBN proceeds,
The bonding force between cBNs is reduced. The sintering temperature at which grain growth of cBN does not occur varies depending on the crystallinity and grain size of the starting material.
【００１８】上記の適切な焼結温度範囲で焼結したｃＢ
Ｎ焼結体は、粒径１μｍ以下のｃＢＮからなる緻密な組
織を有し、曲げ強度が高い。この焼結体の破面を見る
と、粒内破壊が支配的で、粒子同士の結合力が強いこと
を示している。１０００℃の高温でも強度が低下せず、
むしろ室温より向上すると言う驚くべき傾向がある。高
温下で、粒子内の転位の移動による塑性変形が起こり、
それにより亀裂先端での応力集中が緩和され、破壊強度
が向上すると考えられる。CB sintered in the above-mentioned appropriate sintering temperature range
The N sintered body has a dense structure made of cBN having a particle size of 1 μm or less, and has high bending strength. The fracture surface of this sintered body indicates that intragranular fracture is dominant and that the bonding force between the particles is strong. The strength does not decrease even at a high temperature of 1000 ° C.
Rather, there is a surprising tendency to improve over room temperature. Under high temperature, plastic deformation occurs due to the movement of dislocations in the particles,
It is considered that the stress concentration at the crack tip is thereby alleviated, and the fracture strength is improved.
【００１９】一方、これより高い温度で焼結した焼結体
は、粒径が１μｍを越え、破面を見ると主に粒界で破壊
し、粒間結合が弱いことを示した。高温下ではさらに強
度が低下、１０００℃では室温の約半分程度の強度とな
る。高温下では弱い粒界が更に弱化し、粒界で不均一な
変形がおこるため、高温での強度が低下すると考えられ
る。従来の直接変換によるｃＢＮ焼結体は、結晶性のよ
いｈＢＮやｐＢＮを用いていたので、十分なｈＢＮ→ｃ
ＢＮ変換を行うのに２１００℃以上の温度が必要で、そ
の結果、焼結体を構成するｃＢＮ粒子の粒径が３〜５μ
ｍと大きくなり、粒子間の結合力も弱く、上記の理由で
高温での強度は低い。すなわち、従来の方法では、本発
明のような高温下で高い強度を有する焼結体は得られな
い。なお、１４００℃を越える高温下では、ｃＢＮはｈ
ＢＮに変換する。On the other hand, the sintered body sintered at a higher temperature than this had a grain size of more than 1 μm, and the fracture surface showed that the sintered body was broken mainly at the grain boundaries, indicating that intergranular bonding was weak. At high temperatures, the strength is further reduced, and at 1000 ° C., the strength is about half of room temperature. It is considered that at high temperatures, weak grain boundaries are further weakened, and uneven deformation occurs at the grain boundaries, so that the strength at high temperatures is reduced. Since the conventional cBN sintered body by direct conversion uses hBN or pBN having good crystallinity, a sufficient hBN → c
To perform the BN conversion, a temperature of 2100 ° C. or higher is required, and as a result, the particle size of the cBN particles constituting the sintered body is 3 to 5 μm.
m, the bonding strength between the particles is weak, and the strength at high temperatures is low for the above-mentioned reason. That is, the conventional method cannot provide a sintered body having high strength at a high temperature as in the present invention. At high temperatures exceeding 1400 ° C., cBN is h
Convert to BN.
【００２０】また、本発明のｃＢＮ焼結体は０．０１〜
０．５体積％の圧縮型ｈＢＮを含むのが特徴である。こ
の程度の圧縮型ｈＢＮは焼結体の強度に影響を及ぼさな
い。むしろ亀裂の進展を阻止し、靱性を向上させる効果
がある。圧縮型ｈＢＮが０．０１体積より少ない焼結体
は、靱性が低下し、０．５体積％を超えると、圧縮型ｈ
ＢＮでの応力集中が大きくなり、強度が低下する。The cBN sintered body of the present invention has a
It is characterized by containing 0.5% by volume of compressed hBN. Such a compression type hBN does not affect the strength of the sintered body. Rather, it has the effect of preventing the growth of cracks and improving toughness. A sintered body having a compression type hBN of less than 0.01 volume has a reduced toughness.
The stress concentration in the BN increases, and the strength decreases.
【００２１】[0021]
【発明の実施の形態】次に本発明の具体的な実施の態様
を実施例によって説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, specific embodiments of the present invention will be described with reference to examples.
【００２２】[0022]
【実施例】窒素雰囲気中で、酸化ホウ素（Ｂ2 Ｏ3 ）と
メラミン（Ｃ3 Ｎ6 Ｈ6 ）の混合物を炭素で還元窒化さ
せて微細なｈＢＮの粉末を合成し、さらに、窒素雰囲気
中、２１００℃で２時間処理した。得られたｈＢＮ粉末
は、平均粒径０．１μｍで、酸素含有量は０．１重量％
であった。このｈＢＮ粉末を６ｔｏｎ／ｃｍ2 で型押し
成形し、直径８ｍｍ、厚み３ｍｍの試料体を作製し、こ
の試料体を再度、高周波炉で、Ｎ2 ガス中、２１００℃
で２時間かけて高純度処理した。EXAMPLE In a nitrogen atmosphere, a mixture of boron oxide (B 2 O 3 ) and melamine (C 3 N 6 H 6 ) was reduced and nitrided with carbon to synthesize a fine hBN powder, and further, in a nitrogen atmosphere. And treated at 2100 ° C. for 2 hours. The obtained hBN powder has an average particle size of 0.1 μm and an oxygen content of 0.1% by weight.
Met. This hBN powder was embossed at 6 ton / cm 2 to prepare a sample having a diameter of 8 mm and a thickness of 3 mm, and this sample was again subjected to a high frequency furnace at 2100 ° C. in N 2 gas.
For 2 hours.
【００２３】次にこの高純度処理した試料体をＭｏカプ
セルに入れ、６．５ＧＰａに保ったベルト型高圧発生装
置中で、表１に記載した実施例１、２、３並びに比較例
１、２の焼結温度に１５分間保持し、ｃＢＮに直接変
換、焼結した。得られた各焼結体は表１に示すようにほ
とんどｃＢＮからなる緻密な焼結体で、０．０３〜０．
３３体積％の圧縮型ｈＢＮを含むことがわかった。また
それぞれの焼結体の破面をＳＥＭ観察したところ、いず
れもｃＢＮ粒子の大きさは約０．１〜０．５μｍと微細
であり、かつ、粒内破壊が支配的で、粒子同士が強固に
結合していることを示していた。Next, the high-purity treated sample was placed in a Mo capsule, and placed in a belt-type high-pressure generator maintained at 6.5 GPa. Was kept at the sintering temperature for 15 minutes, directly converted to cBN and sintered. As shown in Table 1, each of the obtained sintered bodies was a dense sintered body almost composed of cBN.
It was found to contain 33% by volume of compressed hBN. Further, when the fracture surface of each sintered body was observed by SEM, the size of each cBN particle was as fine as about 0.1 to 0.5 μm, and intragranular fracture was dominant. It was shown to be bound to.
【００２４】これらの焼結体から、６×３×０．７ｍｍ
の試料片を切り出し、ＳｉＣ製の治具を用いて、曲げ強
度（スパン長：４ｍｍ）を測定した。結果を表１に示
す。なお市販されているバインダー約１０％を含むｃＢ
Ｎ焼結体の測定結果も比較例３として同表中に記載し
た。From these sintered bodies, 6 × 3 × 0.7 mm
Was cut out, and the bending strength (span length: 4 mm) was measured using a jig made of SiC. Table 1 shows the results. CB containing about 10% of a commercially available binder
The measurement results of the N sintered body are also shown in the table as Comparative Example 3.
【００２５】[0025]
【表１】 [Table 1]
【００２６】[0026]
【発明の効果】以上各項において述べたように、本発明
によるｃＢＮ焼結体は、微粒でｃＢＮ粒子同士が強固に
結合した緻密な組織を有するため、高強度で、高温でも
その強度が低下することがない。As described above, the cBN sintered body according to the present invention has a high-strength structure and a low strength even at a high temperature because it has a fine structure in which cBN particles are firmly bonded to each other. Never do.
【００２７】特に１０００℃以上１４００℃以下の高温
域での強度は、従来のｃＢＮ焼結体の２倍以上を示すと
言う驚くべき特徴を有する。従って、たとえば本発明の
ｃＢＮ焼結体を鉄系材料の高速切削材料として用いれ
ば、その切削速度、精度寿命を更に向上せしめることが
可能となる。In particular, there is a surprising feature that the strength in the high temperature range of 1000 ° C. to 1400 ° C. is twice or more that of the conventional cBN sintered body. Therefore, for example, if the cBN sintered body of the present invention is used as a high-speed cutting material of an iron-based material, the cutting speed and the precision life can be further improved.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 ＦＩ Ｃ０４Ｂ 35/626 Ｃ０４Ｂ 35/58 １０３Ｑ ──────────────────────────────────────────────────続 き Continued on front page (51) Int.Cl. 6 Identification code FI C04B 35/626 C04B 35/58 103Q
Claims (6)
で、各立方晶窒化ホウ素粒子同士が結合し、実質的にバ
インダーを含まない焼結体であって、８００℃以上１４
００℃以下の温度域において強度が低下しないことを特
徴とする立方晶窒化ホウ素焼結体。1. A sintered body having a cubic boron nitride content of 99.5% by volume or more, in which each cubic boron nitride particle is bonded to each other, and substantially does not contain a binder.
A cubic boron nitride sintered body characterized in that strength does not decrease in a temperature range of 00 ° C or lower.
であることを特徴とする請求項１記載の立方晶窒化ホウ
素焼結体。2. The cubic boron nitride sintered body according to claim 1, wherein the particle diameter of the cubic boron nitride is 1 μm or less.
０．５体積％含むことを特徴とする請求項１または２記
載の立方晶窒化ホウ素焼結体。3. The method according to claim 1, wherein the compression type hexagonal boron nitride is 0.01 to
The cubic boron nitride sintered body according to claim 1, wherein the sintered body contains 0.5% by volume.
における強度が室温の強度より高いことを特徴とする請
求項１、２または３記載の立方晶窒化ホウ素焼結体。4. The cubic boron nitride sintered body according to claim 1, wherein the strength in a temperature range from 1000 ° C. to 1400 ° C. is higher than the strength at room temperature.
窒化させて得た常圧型窒化ホウ素を、非酸化性雰囲気で
加熱して高純度精製処理を施した後、触媒を添加せず圧
力６〜７ＧＰａ、温度１５５０〜２１００℃を加えて直
接立方晶窒化ホウ素に変換、焼結せしめることを特徴と
する立方晶窒化ホウ素焼結体の製造方法。5. A normal-pressure type boron nitride obtained by reducing and nitriding a compound containing boron and oxygen with carbon is subjected to a high-purity purification treatment by heating in a non-oxidizing atmosphere. A method for producing a cubic boron nitride sintered body, which comprises directly converting sintering to cubic boron nitride by applying 〜7 GPa and a temperature of 1550-2100 ° C. and sintering the cubic boron nitride.
３または４記載の立方晶窒化ホウ素焼結体を生成するこ
とを特徴とする立方晶窒化ホウ素焼結体の製造方法。6. The method according to claim 5, wherein
5. A method for producing a cubic boron nitride sintered body, which comprises producing the cubic boron nitride sintered body according to 3 or 4.
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