WO2014156625A1 - 立方晶窒化ホウ素焼結体の製造方法および立方晶窒化ホウ素焼結体 - Google Patents
立方晶窒化ホウ素焼結体の製造方法および立方晶窒化ホウ素焼結体 Download PDFInfo
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Definitions
- the present invention relates to a sintered body mainly containing cubic boron nitride (hereinafter also referred to as cBN). More particularly, the invention relates to a high cBN content sintered body having a particularly high cBN content.
- cBN cubic boron nitride
- cBN is known to have characteristics such as high hardness next to diamond, high thermal conductivity, and low affinity with iron-based materials, and the sintered body is used for cutting tools There is.
- the cBN sintered body used for the cutting tool can be roughly classified into two compositions of a high cBN content sintered body and a low cBN content sintered body.
- the content of cBN particles is high, and cBN particles are directly bonded to each other, and the remaining portion has a sintered structure which is bonded by a binder mainly composed of Co or Al.
- the latter has a sintered body structure in which particles are bonded via a ceramic material such as TiN or TiC because the content of cBN particles is low and there are few sites where cBN particles are in contact with each other. .
- Patent Document 1 discloses a cBN sintered body comprising 88 to 97% by volume of cBN, a binder phase, and an unavoidable impurity.
- the high cBN content sintered body has a sintered structure in which cBN particles are directly bonded to each other as described above.
- the sintered body structure in which cBN particles having high thermal conductivity are continuously bonded has an advantage of easily dissipating the heat generated by the friction with the work material at the time of cutting. Therefore, the high cBN content sintered body is suitable for cutting of cast iron and the like in which damage by thermal shock is dominant.
- the high content of cBN particles having high hardness makes them suitable for cutting of sintered alloys in which mechanical wear is dominant.
- Such a high cBN content sintered body is produced by mixing cBN particles and a binder, and sintering the mixture under pressure-temperature conditions in which cBN does not convert to hBN (hexagonal boron nitride).
- hBN hexagonal boron nitride
- the binder contains a component that promotes the bonding of the cBN particles, a portion (also called neck growth) where the cBN particles are directly bonded to each other is formed, and a strong sintered body structure can be obtained. It is considered.
- the present invention has been made in view of the above-described present conditions, and an object thereof is to provide a cubic boron nitride sintered body having excellent wear resistance and fracture resistance.
- the inventors of the present invention conducted intensive studies on the individual actions of the respective components constituting the sintered body structure in order to solve the above-mentioned problems, and it was found that the respective components constituting the binder were uniformly dispersed in the structure. Also, it has been found that, for each specific component, localizing at a specific location is more likely to exhibit the function of binding the entire sintered compact tissue. Then, based on the findings, the inventors further studied, and as a result, the specific component is localized at the grain boundaries of the cBN particles, and the other component is localized at the void portion where the cBN particles do not exist, It has been found that it is possible to construct a sinter structure that is dramatically enhanced, and the present invention has been completed.
- the method for producing a cubic boron nitride sintered body according to the present invention is a method for producing a cubic boron nitride sintered body in which the content of cubic boron nitride particles is 80% by volume or more and 99% by volume or less.
- a third step of obtaining a mixture, and a fourth step of sintering the mixture are characterized.
- coated particles are preferably particles substantially entirely covered with the coating material.
- the binder preferably contains at least one element selected from the group consisting of tungsten (W), cobalt (Co) and aluminum (Al).
- the binder preferably further contains at least one element selected from the group consisting of carbon (C), nitrogen (N), boron (B) and oxygen (O).
- the coating material preferably contains at least one element selected from the group consisting of chromium (Cr), nickel (Ni) and molybdenum (Mo).
- the second step is preferably a step of covering the cubic boron nitride particles with the covering material by physical vapor deposition.
- the cubic boron nitride sintered body of the present invention contains cubic boron nitride particles, a binder, and a covering material, and the content of the cubic boron nitride particles is 80% by volume or more and 99% by volume or less.
- the binder contains at least one element selected from the group consisting of tungsten, cobalt and aluminum, and the content of the coating material is 0.1% by mass or more and 1.5% by mass or less, and the cubic crystal It is characterized in that boron nitride particles are coated with the coating material.
- the cubic boron nitride particles are substantially covered with the covering material.
- the binder preferably further contains at least one element selected from the group consisting of carbon, nitrogen, boron and oxygen.
- the coating material preferably contains at least one element selected from the group consisting of chromium, nickel and molybdenum.
- the content of the cubic boron nitride particles is preferably 85% by volume or more and 93% by volume or less.
- the cubic boron nitride sintered body of the present invention has excellent wear resistance and fracture resistance.
- Cubic boron nitride sintered body The cubic boron nitride sintered body (hereinafter also referred to as cBN sintered body) of the present embodiment contains cubic boron nitride particles (hereinafter also referred to as cBN particles) at a high content of 80% by volume or more, and the balance As a binder, including a coating material.
- cBN sintered body can constitute a cutting tool suitable for cutting of a sintered alloy, cast iron or the like.
- the cBN sintered body of the present embodiment can contain any other component as long as it contains the above components. For example, impurities may be contained.
- the cBN sintered body of the present embodiment has a sintered body structure in which cBN particles are coated with a covering material containing a specific element.
- the cBN sintered body of the present embodiment will be described with reference to FIGS. 1 and 2.
- FIGS. 1 and 2 are diagrams schematically showing an example of an observation field when a cross section of a cBN sintered body is observed by, for example, a scanning transmission electron microscope (STEM) or the like.
- FIG. 1 shows a cBN sintered body according to the present embodiment
- FIG. 2 shows a conventional cBN sintered body.
- the surface of cBN particles 1 is covered with a covering material 2. That is, the cBN particles 1 are coated particles. Therefore, the covering material 2 is uniformly distributed in the part (grain boundary) which cBN particle 1 comrades contact
- a neck growth is formed between the particles, and the particles are bonded starting from this. Then, the void portion in which the cBN particles do not exist is filled with the bonding material 3.
- the binder in the sintered body structure may be called a binder phase.
- the coating material of the present embodiment is made of an element having a particularly strong action of promoting the growth of neck growth. Therefore, in the cBN sintered body of the present embodiment, the bonding strength between cBN particles is extremely high.
- the cutting tool made of the cBN sintered body of the present embodiment can exhibit excellent wear resistance and can significantly reduce the incidence of defects in intermittent cutting.
- That the element distribution in the sintered structure is in the above-mentioned state means that, for example, energy dispersive X-ray spectroscopy (EDS) is performed in the cross-sectional observation field of STEM to perform element mapping. It can be confirmed by At this time, for observation by STEM, it is preferable to use STEM High-Angle Annular Dark-field Scanning Transmission Electron Microscopy (HAADF-STEM).
- HAADF-STEM STEM High-Angle Annular Dark-field Scanning Transmission Electron Microscopy
- the cBN particles are contained in the cBN sintered body at a content of 80% by volume to 99% by volume.
- the cBN particles are materials that exhibit excellent hardness and thermal conductivity, and when the content is in the above range, they exhibit sufficient tool life even under conditions where thermal shock is applied to the cutting edge as in intermittent cutting.
- the cBN particle content is less than 80% by volume, the cBN particles may not be in sufficient contact with each other, and the thermal conductivity tends to decrease.
- the content of cBN particles is preferably 85% by volume or more and 93% by volume or less.
- volume% refers to the volume% of the powder consisting of cBN particles (hereinafter also referred to as cBN powder) used when producing the cBN sintered body within the above range (that is, 80 volume% or more and 99 volume%)
- cBN powder cBN particles
- the following can be realized by mixing with other raw materials. Moreover, it can also measure by cut
- the cBN particles preferably have a small average particle diameter, and preferably have an average particle diameter of 5 ⁇ m or less. Further, from the viewpoint of enhancing the toughness of the sintered body structure, the average particle diameter of the cBN particles is preferably 0.5 ⁇ m or more. Furthermore, from the viewpoint of the balance between the strength and toughness of the sintered body structure, the average particle diameter of the cBN particles is more preferably 1 ⁇ m or more and 3 ⁇ m or less.
- the binder according to the present embodiment is present in the sintered body tissue so as to fill the voids between the cBN particles, and has the function of holding and bonding the entire tissue.
- a binder contains at least one element selected from the group consisting of tungsten (W), cobalt (Co) and aluminum (Al).
- the binder preferably further contains at least one element selected from the group consisting of carbon (C), nitrogen (N), boron (B) and oxygen (O).
- the binder may be composed of a single element of W, Co or Al, or may be composed of a mutual solid solution of these two or more elements.
- it may be composed of a compound of one or more elements selected from W, Co and Al, and one or more elements selected from C, N, B and O. And the compound of this may be a solid solution.
- WC As a compound or solid solution of one or more elements selected from W, Co and Al, and one or more elements selected from C, N, B and O, for example, WC, W 2 C, W 3 Co 3 C, CoWB, CoC, TiAlN, TiAlCrN, TiAlSiN, TiAlSiCrN, AlCrN, AlCrCN, AlCrVN, TiAlBN, TiAlBCN, AlN, AlCN, AlB 2 , Al 2 O 3 and the like can be mentioned.
- Such a binder has high bond strength with cBN particles and is chemically stable, so that the wear resistance of the sintered body tool can be improved.
- the binder content is preferably 2% by mass or more and 20% by mass or less.
- the coating material of the present embodiment is composed of an element having a particularly strong action of promoting the growth of neck growth at the grain boundaries of cBN particles, and it should be called a bonding promoter.
- the coating material preferably contains at least one element selected from the group consisting of chromium (Cr), nickel (Ni) and molybdenum (Mo). Conventionally, such an element group has been considered as a part of a bonding material, but this embodiment is characterized by using these as a coating material.
- the covering material can contain other components as long as it contains the above elements. That is, it may be a compound containing the above-described elements, a solid solution thereof, or the like. Such compounds can include, for example, CrCo, Mo 2 C, NiC, NiAl, CrAl, CoCrAl the like.
- the content of the covering material needs to be 0.1% by mass or more and 1.5% by mass or less with respect to the entire cBN sintered body. If the content of the covering material is less than 0.1% by mass, the neck growth may not sufficiently grow and the bonding strength may be insufficient. If it exceeds 1.5% by mass, the strength of the covering material itself is low. On the contrary, the toughness may be reduced.
- the content of the coating material is more preferably 0.1% by mass or more and 1.0% by mass or less.
- the coating material in the sintered body structure preferably has a mass content smaller than that of the binder, and the ratio of the coating to the whole binder is 0.1 mass% or more. It is preferable that it is mass% or less.
- the covering material may constitute a covering layer on the surface of the cBN particles.
- the covering layer may be a single layer or multiple layers.
- the covering layer may be composed of a plurality of elements.
- the cBN particles be substantially entirely covered by a covering material.
- substantially coated on the entire surface indicates that the “coverage” measured as follows is 70% or more, and all the particle surface is necessarily coated. Does not indicate.
- the coverage is calculated as follows. First, the cBN sintered body is cut, and the cross section is observed with a STEM at a magnification of 1000 to 10000. In the observation view image, a square circumscribing the cBN particles is drawn, and the square is divided into partial regions of at least 4 rows and 4 columns. Then, a partial region including the outer peripheral portion (outline) of the cBN particle is determined as a measurement point. At this time, an interface where cBN particles are in contact with each other and joined is also a contour line. In addition, it is preferable to adjust the magnification and the field of view so that the total number of measurement points is at least 10 or more.
- EDS analysis is performed in the same field of view, and among the measurement points determined as described above, measurement points at which the concentration of the coating material element is detected at 0.1 mass% or more are counted. The percentage of the value obtained by dividing the counted measurement points by the total measurement points is taken as the "coverage".
- cBN particles having a coverage of 70% or more are considered to be substantially covered by the covering material. Further, when it is possible to consider that 100 cBN particles arbitrarily selected in the sintered body are substantially covered on the entire surface, the cBN particles are substantially the entire surface over the entire sintered structure. Shall be considered as covered.
- the coverage is preferably 80% or more, more preferably 90% or more.
- a sample for cross-sectional observation can be produced using, for example, a focused ion beam system (FIB), a cross section polisher (CP), or the like.
- FIB focused ion beam system
- CP cross section polisher
- coated particles substantially coated on the entire surface can be obtained, for example, by coating the particles using a publicly known physical vapor deposition (PVD) apparatus.
- PVD physical vapor deposition
- Physical vapor deposition is preferable as a method for coating particles from the viewpoint of forming a thin and uniform coating layer.
- the cubic boron nitride sintered body of the present embodiment described above is manufactured by the following manufacturing method. That is, a cubic boron nitride sintered body manufactured by the following manufacturing method includes the above-described sintered body structure and exhibits excellent wear resistance and fracture resistance.
- FIG. 3 is a flowchart showing the process of producing the cBN sintered body according to the present embodiment. As shown in FIG. 3, the manufacturing method of the present embodiment is characterized by including the first to fourth steps. Each step will be described below.
- cBN particles are prepared. That is, cBN powder is prepared.
- the average particle size of the cBN powder can be, for example, 0.5 ⁇ m or more and 5 ⁇ m or less.
- the particle size distribution of the cBN powder may be adjusted by appropriately performing classification or the like.
- the coated particles are obtained by coating the cBN particles with a coating material (bond promoting material).
- a coating material bond promoting material
- a method of coating the cBN particles although a conventionally known method can be adopted, it is preferable to adopt a physical vapor deposition method. By using physical vapor deposition, the surface of the particles can be coated thinner and more uniformly.
- a physical vapor deposition method a radio frequency (RF) sputtering method, a plating method, a beam vapor deposition method etc. can be mentioned, for example.
- RF radio frequency
- the coated particles obtained in the previous step and the binder are mixed to obtain a mixture.
- the compounding ratio of the coated particles and the binder may be appropriately adjusted so that the cBN particles are contained at a predetermined content in the sintered body.
- the mixing of the coated particles and the binder can be carried out by a conventionally known method, for example, by a grinder such as a ball mill or a mixer.
- the mixture of the coated particles and the binder thus obtained is preferably degassed by heat treatment in a vacuum furnace.
- the mixture obtained in the previous step is sintered to obtain a sintered body.
- the cBN sintered body can be obtained by introducing the mixture into an ultrahigh pressure apparatus and holding a predetermined pressure and temperature for a predetermined time.
- the pressure during ultra-high pressure sintering is preferably 5.0 GPa or more and 10.0 GPa or less.
- the temperature at the time of ultra-high pressure sintering is preferably 1500 ° C. or more and 2000 ° C. or less, and the time required for the process of the ultra-high pressure sintering is preferably 5 minutes or more and 30 minutes or less.
- the cBN sintered body according to the present embodiment can be obtained.
- Example 1 ⁇ Production of cBN sintered body> The cBN sintered body was produced as follows. First, cBN powder having an average particle diameter of about 1.2 ⁇ m was prepared (first step). Next, a powder composed of coated particles was obtained by coating the surface of the cBN particles with a coating material Cr using an RF sputtering PVD apparatus (second step). At this time, the sputtering conditions were adjusted so that the ratio of the covering material (Cr) to the whole of the cBN sintered body was 0.6 mass%.
- a mixture obtained by pulverizing and mixing WC powder, Co powder and Al powder was heat-treated at 1200 ° C. for 30 minutes in vacuum to obtain a compound.
- the compound was pulverized by a planetary ball mill to obtain a powder of a binder.
- the powder composed of the coated particles and the powder of the binder are blended so that the cBN particles content is 93% by volume in the cBN sintered body, and the pot made of Teflon (registered trademark) on the inner wall and Si 3 N
- a mixed powder was obtained by uniformly mixing according to a ball mill mixing method using 4 ball media (third step).
- degassing was performed by holding this mixed powder in a vacuum furnace at 900 ° C. for 20 minutes. After filling the mixed powder after degassing in a capsule made of Mo, cBN sintered body was obtained by holding it at a pressure of 6.5 GPa and a temperature of 1600 ° C. for 20 minutes using an ultrahigh pressure apparatus (fourth step) .
- Comparative Example 1 A cBN sintered body according to Comparative Example 1 was obtained in the same manner as in Example 1 except that the second step was not performed in the above-mentioned "Production of cBN sintered body". That is, the cBN sintered body according to Comparative Example 1 does not contain a covering material.
- Examples 2 to 5 and Comparative Examples 2 and 3 Comparative Examples 2 to 5 and Comparative Examples 2 and 5 are the same as in “Production of cBN sintered body” in Example 1 except that the ratio of the covering material (Cr) to the entire cBN sintered body is changed to the numerical values shown in Table 1. CBN sintered bodies according to Examples 2 and 3 were obtained.
- Comparative Example 4 In the above-mentioned "Production of cBN sintered body", the second step is not carried out, and in the third step, mixed powder is obtained by mixing the powder composed of cBN particles, the binder and the Cr powder. In the same manner as in Example 2, a cBN sintered body according to Comparative Example 4 was obtained. That is, although the cBN sintered body according to Comparative Example 4 contains an element that can be a covering material, the cBN particles are not covered with the element.
- Examples 6 and 7 The cBN sintered bodies according to Examples 6 and 7 are obtained in the same manner as in Example 2 except that Ni and Mo are used instead of Cr in the second step in the above-mentioned "Production of cBN sintered body".
- Examples 8 to 10 and Comparative Examples 5 to 9 The same as in Example 1 and Comparative Example 1 except that in the above-mentioned "Production of cBN Sintered Body", the cBN particle content in the sintered body is adjusted to the values shown in Table 1 in the third step. Thus, cBN sintered bodies according to Examples 8 to 10 and Comparative Examples 5 to 9 were obtained.
- a cutting tool was produced using the cBN sintered bodies of the examples and comparative examples obtained as described above, and the cutting performance (wear resistance and fracture resistance) was evaluated. Specifically, the cBN sintered body manufactured above was brazed to a base material made of cemented carbide, and was formed into a predetermined shape to prepare a cutting tool.
- the content (volume%) of cBN particles and the proportion (mass%) of the covering material were confirmed by the following method.
- a smooth observation surface is created by surface processing, and the grain size of 10 nm can be identified by a scanning electron microscope (hereinafter referred to as SEM) of the structure of cubic boron nitride. The observation was performed with a field of view of 10,000 times. From the obtained SEM image, the proportion of cBN particles in the entire sintered body was determined by image processing. The proportion of the obtained area was considered to be distributed at the same proportion in the depth direction, and is shown in Table 1 as volume%.
- the numerical value shown in the column of the cutting performance of Table 1 is a relative evaluation value on the basis of the drop-off amount of the cutting tool which concerns on the comparative example 1.
- FIG. The relative evaluation value is a value calculated by multiplying 100 by the value obtained by dividing the dropout amount of the cutting tool according to Comparative Example 1 by the dropout amount of each cutting tool. That is, the larger the value, the smaller the dropout amount, and the better the wear resistance and the chipping resistance.
- the composition contains cubic boron nitride particles, a binder, and a coating material, and the content of the cubic boron nitride particles is 80% by volume or more and 99% by volume or less, and the binder is tungsten And at least one element selected from the group consisting of cobalt and aluminum, and the content of the coating material is 0.1% by mass or more and 1.5% by mass or less, and the cubic boron nitride particles are the coating
- the cutting tool using the cBN sintered body according to the embodiment coated with the material is superior in wear resistance and superior to the cutting tool using the cBN sintered body according to the comparative example not satisfying the conditions. It showed chipping resistance.
Abstract
Description
<立方晶窒化ホウ素焼結体>
本実施の形態の立方晶窒化ホウ素焼結体(以下、cBN焼結体とも記す)は、立方晶窒化ホウ素粒子(以下、cBN粒子とも記す)を80体積%以上という高い含有率で含み、残部として結合材、被覆材を含むものである。かかるcBN焼結体は、焼結合金や鋳鉄などの切削加工に好適な切削工具を構成することができる。本実施の形態のcBN焼結体は、上記のような成分を含む限り他に任意の成分を含むことができ、たとえば、不純物などが含まれていたとしても何ら差し支えない。
<立方晶窒化ホウ素粒子>
本実施の形態において、cBN粒子は80体積%以上99体積%以下の含有率でcBN焼結体に含まれている。cBN粒子は、優れた硬度と熱伝導率を示す材料であり、含有率が上記の範囲を占めることにより、断続切削のように刃先に熱衝撃が加わる条件下でも、十分な工具寿命を示す。ここで、cBN粒子の含有率が80体積%未満であると、cBN粒子同士が十分に接触できない場合があり、熱伝導率が低下する傾向にある。他方、99体積%を超えると、焼結体組織において、後述する結合材の存在量が過度に少なくなるため、靭性が低下する傾向にある。なお、cBN粒子の含有率は好ましくは85体積%以上93体積%以下である。
さらに、焼結体組織の強度と靭性のバランスの観点からは、cBN粒子の平均粒径は1μm以上3μm以下であることがより好ましい。
本実施の形態の結合材は、焼結体組織中において、cBN粒子間の空隙を充填するように存在し、組織全体を保持、結合する作用を有するものである。かかる結合材は、タングステン(W)、コバルト(Co)およびアルミニウム(Al)からなる群より選ばれた少なくとも1種の元素を含むものである。そして、結合材は、炭素(C)、窒素(N)、ホウ素(B)および酸素(O)からなる群より選ばれた少なくとも1種の元素をさらに含むことが好ましい。
本実施の形態の被覆材は、cBN粒子同士の粒界においてネックグロースの成長を促進させる作用が特に強い元素から構成されるものであり、いわば結合促進材ともいうべきものである。
図3は本実施の形態のcBN焼結体の製造過程を示すフローチャートである。図3に示すように、本実施の形態の製造方法は、第1の工程~第4の工程を含むことを特徴とする。以下、各工程について説明する。
第1の工程(S101)では、cBN粒子を準備する。すなわち、cBN粉末を準備する。cBN粉末の平均粒径は、たとえば、0.5μm以上5μm以下とすることができる。また、適宜分級などを行なうことにより、cBN粉末の粒度分布を調整してもよい。
第2の工程(S102)では、被覆材(結合促進材)でcBN粒子を被覆することにより被覆粒子を得る。ここで、cBN粒子を被覆する方法としては、従来公知の方法を採用することができるが、物理蒸着法を採用することが好ましい。物理蒸着法を用いることにより、粒子の表面をより薄くかつ均一に被覆することができる。ここで、物理蒸着法としては、たとえば、高周波(RF)スパッタリング法、めっき法、ビーム蒸着法などを挙げることができる。
第3の工程(S103)では、先の工程で得られた被覆粒子と結合材とを混合して混合物を得る。ここで、結合材として複数の金属や化合物を用いる場合には、あらかじめ、それらを、たとえばボールミルなどを用いて、粉砕、混合しておくことが好ましい。被覆粒子と結合材との配合比率は、焼結体においてcBN粒子が所定の含有率で含まれるように適宜調整すればよい。被覆粒子と結合材との混合は、従来公知の方法で行うことができ、たとえば、ボールミルなどの粉砕機、混合機によって行なうことができる。
第4の工程(S104)では、先の工程で得られた混合物を焼結して焼結体を得る。具体的には、該混合物を超高圧装置に導入し、所定の圧力、温度を所定時間保持することによりcBN焼結体を得ることができる。
また、超高圧焼結時の温度は、1500℃以上2000℃以下である好ましく、超高圧焼結の処理に要する時間は、5分以上30分以下であることが好ましい。
<cBN焼結体の製造>
以下のようにして、cBN焼結体を作製した。まず、平均粒径1.2μm程度のcBN粉末を準備した(第1の工程)。次いで、RFスパッタリングPVD装置を用いて、被覆材であるCrでcBN粒子の表面を被覆することにより被覆粒子からなる粉末を得た(第2の工程)。このとき、cBN焼結体全体に対する被覆材(Cr)の占める割合が0.6質量%となるようにスパッタリング条件を調節した。
上述の「cBN焼結体の製造」において、第2の工程を実行しない以外は実施例1と同様にして、比較例1に係るcBN焼結体を得た。すなわち、比較例1に係るcBN焼結体は、被覆材を含有していない。
cBN焼結体全体に対する被覆材(Cr)の占める割合を、表1に示す数値とした以外は、実施例1の「cBN焼結体の製造」と同様にして、実施例2~5、比較例2および3に係るcBN焼結体を得た。
上述の「cBN焼結体の製造」において、第2の工程を実行せず、第3の工程において、cBN粒子からなる粉末と結合材とCr粉末とを混合することにより混合粉末を得る以外は、実施例2と同様にして、比較例4に係るcBN焼結体を得た。すなわち、比較例4に係るcBN焼結体は、被覆材となり得る元素を含んでいるが、cBN粒子は該元素によって被覆されていない。
上述の「cBN焼結体の製造」において、第2の工程でCrの代わりにNi、Moを使用した以外は、実施例2と同様にして実施例6および7に係るcBN焼結体を得た。
上述の「cBN焼結体の製造」において、第3の工程で焼結体におけるcBN粒子の含有率が表1に示す値となるように配合した以外は、実施例1および比較例1と同様にして、実施例8~10および比較例5~9に係るcBN焼結体を得た。
上記のようにして得られた被覆材を含有する各cBN焼結体に対して、STEM観察およびEDS分析を行ない、被覆材元素でマッピングを行なった。その結果、実施例1~10に係るcBN焼結体では、cBN粒子の輪郭が明瞭に確認できる程度にcBN粒子が被覆材によって被覆されていることが確認された。すなわち、cBN粒子同士の粒界にも被覆材が存在していることが確認された。また、上述の方法によって求めた被覆率は、いずれも70%以上であった。したがって、これらの焼結体において、cBN粒子は実質的に全面を被覆材によって被覆されていたとみなすことができる。
次に、上記のようにして得られた実施例および比較例のcBN焼結体を用いて切削工具を作製し、切削性能(耐摩耗性および耐欠損性)を評価した。具体的には、上記で製造されたcBN焼結体を超硬合金製の基材にロウ付けし、所定の形状に成型することにより切削工具を作製した。
被削材 :0.8C-2.0Cu-残Fe(JPMA記号:SMF4040)
切削速度 :Vc=200m/min.
送り量 :f=0.1mm/rev.
切り込み量:ap=0.2mm
湿式切削(切削液あり)。
Claims (11)
- 立方晶窒化ホウ素粒子の含有率が80体積%以上99体積%以下である立方晶窒化ホウ素焼結体の製造方法であって、
立方晶窒化ホウ素粒子を準備する第1の工程と、
被覆材で前記立方晶窒化ホウ素粒子を被覆することにより被覆粒子を得る第2の工程と、
前記被覆粒子と結合材とを混合することにより混合物を得る第3の工程と、
前記混合物を焼結する第4の工程と、を含む立方晶窒化ホウ素焼結体の製造方法。 - 前記被覆粒子は、前記被覆材で実質的に全面が被覆された粒子である、請求項1に記載の立方晶窒化ホウ素焼結体の製造方法。
- 前記結合材は、タングステン、コバルトおよびアルミニウムからなる群より選ばれた少なくとも1種の元素を含む、請求項1または2に記載の立方晶窒化ホウ素焼結体の製造方法。
- 前記結合材は、炭素、窒素、ホウ素および酸素からなる群より選ばれた少なくとも1種の元素をさらに含む、請求項3に記載の立方晶窒化ホウ素焼結体の製造方法。
- 前記被覆材は、クロム、ニッケルおよびモリブデンからなる群より選ばれた少なくとも1種の元素を含む、請求項1~4のいずれか1項に記載の立方晶窒化ホウ素焼結体の製造方法。
- 前記第2の工程は、物理蒸着法により前記被覆材で前記立方晶窒化ホウ素粒子を被覆する工程である、請求項1~5のいずれか1項に記載の立方晶窒化ホウ素焼結体の製造方法。
- 立方晶窒化ホウ素粒子と結合材と被覆材とを含み、
前記立方晶窒化ホウ素粒子の含有率が80体積%以上99体積%以下であり、
前記結合材は、タングステン、コバルトおよびアルミニウムからなる群より選ばれた少なくとも1種の元素を含み、
前記被覆材の含有率が0.1質量%以上1.5質量%以下であり、
前記立方晶窒化ホウ素粒子が前記被覆材により被覆されてなる、立方晶窒化ホウ素焼結体。 - 前記立方晶窒化ホウ素粒子が前記被覆材により実質的に全面を被覆されてなる、請求項7に記載の立方晶窒化ホウ素焼結体。
- 前記結合材は、炭素、窒素、ホウ素および酸素からなる群より選ばれた少なくとも1種の元素をさらに含む、請求項7または8に記載の立方晶窒化ホウ素焼結体。
- 前記被覆材は、クロム、ニッケルおよびモリブデンからなる群より選ばれた少なくとも1種の元素を含む、請求項7~9のいずれか1項に記載の立方晶窒化ホウ素焼結体。
- 前記立方晶窒化ホウ素粒子の含有率が85体積%以上93体積%以下である、請求項7~10のいずれか1項に記載の立方晶窒化ホウ素焼結体。
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CN201480018924.2A CN105189408A (zh) | 2013-03-29 | 2014-03-12 | 立方氮化硼烧结体的制造方法和立方氮化硼烧结体 |
US14/779,400 US9522850B2 (en) | 2013-03-29 | 2014-03-12 | Method for manufacturing cubic boron nitride sintered body, and cubic boron nitride sintered body |
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JP2014198637A (ja) | 2014-10-23 |
KR101811510B1 (ko) | 2017-12-21 |
KR20150119374A (ko) | 2015-10-23 |
MX2015011068A (es) | 2015-10-22 |
EP2980046B1 (en) | 2020-04-29 |
US9522850B2 (en) | 2016-12-20 |
JP6095162B2 (ja) | 2017-03-15 |
CN105189408A (zh) | 2015-12-23 |
EP2980046A1 (en) | 2016-02-03 |
US20160052827A1 (en) | 2016-02-25 |
EP2980046A4 (en) | 2017-02-22 |
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