WO2010119962A1 - 立方晶窒化硼素焼結体および被覆立方晶窒化硼素焼結体 - Google Patents
立方晶窒化硼素焼結体および被覆立方晶窒化硼素焼結体 Download PDFInfo
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Definitions
- the present invention relates to a cubic boron nitride sintered body and a coated cubic boron nitride sintered body. Specifically, the present invention relates to a cubic boron nitride-containing sintered body and a coated cubic boron nitride sintered body that are optimal as cutting tools and wear-resistant tools.
- Cubic boron nitride has characteristics that it has hardness next to diamond, excellent thermal conductivity, and low affinity with iron.
- Cubic boron nitride sintered bodies made of cubic boron nitride and a binder phase of metal or ceramic have been applied to cutting tools, wear-resistant tools, and the like.
- cubic boron nitride sintered bodies cubic boron nitride, aluminum oxide, aluminum nitride and / or aluminum boride, titanium carbide, titanium nitride and / or titanium carbonitride, titanium boride,
- a cubic boron nitride sintered body made of for example, see Patent Document 1.
- the cubic boron nitride sintered body described in Patent Document 1 has not been able to adequately meet these requirements.
- the present invention solves such a problem, and improves the fracture resistance and toughness without reducing the wear resistance, and increases the tool life of the cutting tool and the wear-resistant tool.
- An object is to provide a coated cubic boron nitride sintered body.
- the inventors have conducted research on a cubic boron nitride sintered body, and in order to increase the toughness of the cubic boron nitride sintered body, it is important to suppress propagation of the generated cracks,
- the present invention is completed by obtaining the knowledge that the binder phase of the cubic boron nitride sintered body has many grain boundaries and that the binder phase particles are firmly bonded. It came.
- the present invention relates to a titanium carbonitride (200) in an X-ray diffraction measurement using a Cu—K ⁇ ray, comprising a binder phase containing titanium nitride and titanium carbonitride, cubic boron nitride, and inevitable impurities.
- the distance between the Bragg angle 2 ⁇ of the surface diffraction line and the Bragg angle 2 ⁇ of the (200) plane diffraction line of titanium nitride is 0.30 ° or more and 0.60 ° or less, and the (200) plane diffraction line of titanium carbonitride A cubic boron nitride sintered body having a half width of 0.30 ° or more and 0.50 ° or less.
- the Bragg angle 2 ⁇ of each diffraction line means the Bragg angle 2 ⁇ that indicates the maximum value (peak intensity) of the X-ray diffraction intensity of each diffraction line, and the Bragg angle of the (200) plane diffraction line of titanium carbonitride.
- the interval between the angle 2 ⁇ and the Bragg angle 2 ⁇ of the (200) plane diffraction line of titanium nitride means the absolute value between the Bragg angles 2 ⁇ at which the respective X-ray diffraction intensities show the maximum value (peak intensity).
- the half width of each diffraction line means the peak width at the position where the maximum value (peak intensity) of the X-ray diffraction intensity is halved for each diffraction line.
- the half width of the (200) plane diffraction line of titanium nitride is preferably 0.25 ° or more and 0.45 ° or less, and Cu—K ⁇ ray is used.
- the peak intensity ratio (I TiN / I TiCN ) of the peak intensity I TiN of the (200) plane diffraction line of titanium nitride to the peak intensity I TiCN of the (200) plane diffraction line of titanium carbonitride is 0
- the cubic boron nitride sintered body is 1 to 0.5
- the cubic boron nitride sintered body is aluminum oxide: 3 to 30% by volume with respect to the entire cubic boron nitride sintered body
- Total of titanium nitride and titanium carbonitride 10 to 60% by volume with respect to the entire cubic boron nitride sintered body
- titanium boride 1 to 30% by volume with respect to the entire cubic boron nitride sintered body
- nitrided One or two types of aluminum and aluminum boride: standing A total of 20 to 80% by volume of the binder phase consisting of 10% by volume or less with respect to the entire
- it is preferably composed of 20 to 80% by volume of cubic boron nitride and unavoidable impurities, and is a coated cubic boron nitride sintered body in which a film is coated on the surface of these cubic boron nitride sintered bodies. And preferred.
- the cubic boron nitride sintered body and the coated cubic boron nitride sintered body of the present invention are excellent in wear resistance, fracture resistance and toughness. Therefore, when the cubic boron nitride sintered body and the coated cubic boron nitride sintered body of the present invention are used as a cutting tool or a wear-resistant tool, an effect that the tool life can be extended is obtained.
- the cubic boron nitride sintered body of the present invention comprises a binder phase, cubic boron nitride and unavoidable impurities.
- the binder phase exceeds 80% by volume with respect to the entire cubic boron nitride sintered body, the fracture resistance is lowered, and the binder phase is reduced throughout the cubic boron nitride sintered body.
- the amount is less than 20% by volume, the wear resistance is lowered. Therefore, 20 to 80% by volume of the binder phase relative to the entire cubic boron nitride sintered body and 20% to the entire cubic boron nitride sintered body.
- a cubic boron nitride sintered body composed of up to 80% by volume of cubic boron nitride and inevitable impurities is preferable. More preferably, the binder phase is 30 to 70% by volume with respect to the entire cubic boron nitride sintered body, and 70 to 30% by volume of cubic boron nitride and unavoidable impurities with respect to the entire cubic boron nitride sintered body. Most preferred is a cubic boron nitride sintered body composed of a binder phase of 40 to 60% by volume, cubic boron nitride of 60 to 40% by volume and inevitable impurities.
- the binder phase of the present invention contains titanium nitride and titanium carbonitride.
- the binder phase of the present invention may be composed of titanium nitride and titanium carbonitride, but in addition to titanium nitride and titanium carbonitride, periodic table 4 (Ti, Zr, Hf, etc.), 5 (V, Nb, Ta) Etc.), 6 (Cr, Mo, W etc.) group elements, aluminum carbides, nitrides, borides, silicides and their mutual solid solutions, Fe, Co, Ni, Cr, Mo, W and alloys thereof It is also preferable to contain at least one of the above.
- Specific examples of the binder phase other than titanium nitride and titanium carbonitride include titanium boride, aluminum oxide, aluminum nitride, and aluminum boride.
- Titanium nitride and titanium carbonitride can be added simultaneously as raw material powder to obtain the binder phase of the present invention. Sintering a mixture of titanium compounds having different carbon and nitrogen contents facilitates the formation of a mutual solid solution and strengthens the bond between the binder phase particles.
- the cubic boron nitride sintered body of the present invention is subjected to X-ray diffraction measurement using Cu—K ⁇ rays, the Bragg angle 2 ⁇ of the (200) plane diffraction line of titanium carbonitride and the (200) plane diffraction of titanium nitride are measured. The distance between the line and the Bragg angle 2 ⁇ is 0.30 ° or more and 0.60 ° or less.
- this interval When this interval is less than 0.30 °, the bonds between the binder phase particles are hardly strengthened, and when this interval exceeds 0.60 °, the resistance to iron at high temperatures decreases,
- the interval was set to 0.30 ° or more and 0.60 ° or less. This interval is preferably 0.30 ° or more and 0.50 ° or less, and more preferably 0.30 ° or more and 0.45 ° or less.
- This interval can be adjusted by adjusting the position of the Bragg angle 2 ⁇ of the (200) plane diffraction line of titanium nitride and the position of the Bragg angle 2 ⁇ of the (200) plane diffraction line of titanium carbonitride.
- the Bragg angle 2 ⁇ of the (200) plane diffraction line of titanium nitride can be adjusted by the ratio of the metal element and the nonmetal element contained in the titanium nitride powder of the raw material powder.
- x 1 nonmetallic element to the metal element (Ti) contained in the titanium nitride powder of the raw material powder (N) is less than 1, (200) plane of the titanium nitride sintered body
- the Bragg angle 2 ⁇ of the diffraction line is shifted to the high angle side.
- the Bragg angle 2 ⁇ of the (200) plane diffraction line of titanium carbonitride can be adjusted by the ratio of the metal element to the nonmetallic element and the ratio of carbon to nitrogen contained in the titanium carbonitride powder of the raw material powder. Specifically, according to the atomic ratio x 2 of the non-metallic element to the metal element (Ti) contained in the titanium carbonitride powder of the raw material powder (CN) is smaller than 1, the titanium carbonitride of the sintered body (200 ) The Bragg angle 2 ⁇ of the surface diffraction line is shifted to the high angle side.
- the Bragg angle 2 ⁇ of the (200) plane diffraction line of the sintered titanium carbonitride shifts to the lower angle side.
- non-metallic element to the metal element (Ti) contained in the titanium carbonitride powder of the raw material powder atomic ratio x 2 of the (CN) and 1, the carbon to the sum of carbon and nitrogen contained in the titanium carbonitride powder of the raw material powder when the atomic ratio x 3 0.4, Bragg angle 2 [Theta] of (200) plane diffraction line titanium carbonitride of the sintered body will 2 ⁇ 42.16 ⁇ 42.26 °.
- non-metallic element to the metal element (Ti) contained in the titanium carbonitride powder of the raw material powder atomic ratio x 2 of the (CN) and 1, the carbon to the sum of carbon and nitrogen contained in the titanium carbonitride powder of the raw material powder when the atomic ratio x 3 to 0.7, Bragg angle 2 [Theta] of (200) plane diffraction line titanium carbonitride of the sintered body will 2 ⁇ 41.91 ⁇ 42.01 °.
- the titanium nitride powder is an atomic ratio x 1 nonmetallic element to the metal element contained in the titanium nitride powder (Ti) (N) is 1, carbonitride an atomic ratio x 2 of the non-metal element to a metal element contained in the titanium powder (Ti) (CN) is 1, the atomic ratio x 3 of carbon to the sum of carbon and nitrogen contained in the titanium carbonitride powder is 0.4 It is preferable to use a titanium carbonitride powder of ⁇ 0.7.
- the peak intensity ratio of I TiN for I TiCN is 0.1 to 0.5, and most preferably from 0.1 to 0.3.
- the half-value width of the (200) plane diffraction line of titanium carbonitride contained in the cubic boron nitride sintered body of the present invention is 0.30 ° or more, the average particle size of titanium carbonitride becomes finer and cubic nitriding. The mechanical strength of the boron sintered body is improved.
- the half-value width of the (200) plane diffraction line of titanium carbonitride exceeds 0.50 °, the average particle size of titanium carbonitride becomes too fine, and crack propagation is mainly due to intergranular fracture, and toughness Decreases. Therefore, the half width of the (200) plane diffraction line of titanium carbonitride was set to 0.30 ° or more and 0.50 ° or less.
- the half width is preferably 0.30 ° or more and 0.45 ° or less, and more preferably 0.30 ° or more and 0.40 ° or less.
- This half width can be adjusted by the average particle diameter of the raw material titanium carbonitride and the ball mill mixing time. Specifically, by setting the average particle size of the titanium carbonitride powder to 0.8 to 1.5 ⁇ m and the ball mill mixing time to 1 to 120 hours, the half width of the (200) plane diffraction line of titanium carbonitride Can be made 0.30 ° or more and 0.50 ° or less.
- the half width of the (200) plane diffraction line of titanium nitride contained in the cubic boron nitride sintered body of the present invention is 0.25 ° or more, the average grain size of titanium nitride becomes finer and cubic boron nitride sintered. The mechanical strength of the bonded body is further improved.
- the half width of the (200) plane diffraction line of titanium nitride increases beyond 0.45 °, the average grain size of titanium nitride becomes finer, and crack propagation tends to be due to intergranular fracture, leading to a decrease in toughness. Show.
- the half width of the (200) plane diffraction line of titanium nitride is preferably 0.25 ° or more and 0.45 ° or less.
- the half width is preferably 0.25 ° to 0.40 °, more preferably 0.25 ° to 0.35 °.
- This half width can be adjusted by the average particle diameter of the titanium nitride of the raw material powder and the ball mill mixing time. Specifically, by setting the average particle size of the titanium nitride powder to 0.8 to 1.5 ⁇ m and the ball mill mixing time to 1 to 120 hours, the half width of the (200) plane diffraction line of titanium nitride is reduced to 0. It can be set to 25 ° or more and 0.45 ° or less.
- the Bragg angle 2 ⁇ , the half width, and the peak intensity of the (200) plane diffraction line of titanium carbonitride and the (200) plane diffraction line of titanium nitride can be measured using a commercially available X-ray diffractometer.
- Phases other than cubic boron nitride (cBN) and cBN for example, TiN, Ti (C 0.5 N 0.5 ), Ti (C 0.8 N 0.2 ), Ti () included in the cubic boron nitride sintered body of the present invention.
- C 0.2 N 0.8 ), TiB 2 , AlN, Al 2 O 3, etc. (volume%) can be determined from SEM observation, EDS analysis, and X-ray diffraction measurement.
- the cubic boron nitride sintered body is subjected to X-ray diffraction measurement to identify each phase of the cubic boron nitride sintered body, and the peak intensity of each phase is measured. Further, the ratio of the peak intensity of each phase to the peak intensity of cBN in the cubic boron nitride sintered body is calculated.
- a powder having the same component as each phase included in the cubic boron nitride sintered body is prepared.
- the content (volume%) of cBN obtained by SEM observation of the cubic boron nitride sintered body is the same as the blending quantity (volume%) of cBN powder, and some blending ratios of powders other than cBN are changed. These powders are blended. At this time, the total amount (volume%) of powders other than cBN is made the same as the binder phase content (volume%) obtained by SEM observation of the cubic boron nitride sintered body. The powder blended at such a ratio is mixed well.
- X-ray diffraction measurement is performed on the obtained mixed powder, the peak intensity of each phase is measured, and the peak intensity ratio of each phase to the peak intensity of cBN in the mixed powder is calculated.
- a calibration curve showing the relationship between the peak intensity ratio of each phase to the peak intensity of cBN in the mixed powder and the blending amount (volume%) of each phase is obtained.
- the content (volume%) of each phase other than cBN in the cubic boron nitride sintered body can be obtained from the peak intensity ratio of each phase other than cBN in the cubic boron nitride sintered body. it can.
- the cubic boron nitride sintered body of the present invention is aluminum oxide: 3 to 30% by volume with respect to the entire cubic boron nitride sintered body, and the total of titanium nitride and titanium carbonitride: the entire cubic boron nitride sintered body 10 to 60% by volume with respect to the titanium borate: 1 to 30% by volume with respect to the entire cubic boron nitride sintered body, and one or two types of aluminum nitride and aluminum boride: cubic boron nitride firing A total of 20 to 80% by volume of the binder phase consisting of 10% by volume or less of the entire sintered body and 80% to 80% of the entire cubic boron nitride sintered body.
- the balance of wear resistance and toughness of the cubic boron nitride sintered body is good, and the effect of further extending the life is obtained when used as a tool. This is preferable. This is due to the following reason.
- the aluminum powder in the raw material powder in the manufacturing process combines with oxygen adsorbed on the raw material powder or oxygen in the air to form aluminum oxide, but the aluminum oxide is 3 volumes with respect to the entire cubic boron nitride sintered body. If it is less than%, the toughness decreases, and conversely, if the amount of aluminum oxide exceeds 30% by volume with respect to the entire cubic boron nitride sintered body, the wear resistance decreases.
- the wear resistance decreases, and conversely, the total of titanium nitride and titanium carbonitride exceeds 60% by volume.
- the other binder phase components are relatively decreased, so that toughness and heat resistance are lowered.
- titanium boride is less than 1% by volume with respect to the entire cubic boron nitride sintered body, the toughness decreases, and conversely, titanium boride is more than 30% by volume with respect to the entire cubic boron nitride sintered body. As a result, the wear resistance decreases.
- aluminum nitride and aluminum boride exceeds 10% by volume with respect to the entire cubic boron nitride sintered body, the mechanical strength and toughness are lowered. More preferably, with respect to the entire cubic boron nitride sintered body, aluminum oxide: 3 to 20% by volume, total of titanium nitride and titanium carbonitride: 20 to 55% by volume, titanium boride: 1 to 20% by volume, nitriding One or two of aluminum and aluminum boride: a binder phase consisting of 9% by volume or less, more preferably aluminum oxide: 3 to 15% by volume, and the total of titanium nitride and titanium carbonitride: 30 to 55% by volume Titanium boride: 1 to 10% by volume, one or two types of aluminum nitride and aluminum boride: 8% by volume or less.
- Examples of impurities inevitably contained in the cubic boron nitride sintered body of the present invention include Cu mixed from the raw material powder of the cubic boron nitride sintered body.
- the total amount of inevitable impurities is generally 0.5% by weight or less with respect to the entire cubic boron nitride sintered body, and usually 0.2% by weight with respect to the entire cubic boron nitride sintered body. Since it can be suppressed to the following, the characteristic value of the present invention is not affected.
- the binder phase in addition to the cubic boron nitride, the binder phase, and the inevitable impurities, other than the inevitable impurities, as long as the characteristics of the cubic boron nitride sintered body of the present invention are not impaired.
- the coating of the present invention comprises at least one of periodic table 4, 5, 6 element, Al, Si metal, oxide, carbide, nitride, boride, and mutual solid solution thereof.
- Specific examples include TiN, TiC, TiCN, TiAlN, TiSiN, and CrAlN.
- the coating is preferably either a single layer or a laminate of two or more layers, and is also preferably an alternating laminated film in which thin films having different layer thicknesses of 5 to 200 nm are alternately laminated.
- the average film thickness is preferably from 0.5 to 15 ⁇ m. Among them, 1 to 10 ⁇ m is more preferable, and 1.5 to 5 ⁇ m is more preferable among them.
- the cubic boron nitride sintered body of the present invention is a carbon having an average particle size of 0.5 to 1.0 ⁇ m, in which the atomic ratio of carbon to the total of carbon and nitrogen contained in titanium carbonitride is 0.3 to 0.7.
- a titanium nitride powder, a titanium nitride powder having an average particle diameter of 0.5 to 1.2 ⁇ m, an aluminum powder, a cubic boron nitride powder, and paraffin are mixed, and the resulting mixture is molded, and the pressure is 1 ⁇ 10 ⁇ 3.
- Vacuum heat treatment is performed at a temperature of 700 to 1000 ° C. in a vacuum of Torr or lower to remove organic substances such as paraffin, and then put into an ultrahigh pressure and high temperature generator, under conditions of pressure 4 to 6 GPa and temperature 1400 to 1600 ° C. Obtained by sintering.
- cubic boron nitride sintered body and the coated cubic boron nitride sintered body of the present invention are excellent in wear resistance, fracture resistance and toughness, they are preferably applied to cutting tools and wear resistant tools. More preferably, it is applied to a tool.
- Example 1 Cubic boron nitride (cBN) powder having an average particle diameter of 2 ⁇ m, Ti (C 0.5 N 0.5 ) powder, Ti (C 0.8 N 0.2 ) powder, Ti (C 0.2 N 0.8 ) powder and TiN having an average particle diameter shown in Table 1
- the powders both Ti compounds having a stoichiometric composition in which the ratio of metal elements to nonmetal elements is 1: 1) and Al powder having an average particle diameter of 2 ⁇ m were blended in the blending composition shown in Table 1.
- the blended raw material powder was put into a ball mill cylinder together with a cemented carbide ball, hexane solvent and paraffin, and ball mill mixing was performed for 48 hours.
- the mixed powder obtained by mixing and pulverizing with a ball mill was compacted and then deparaffinized under the conditions of 1 ⁇ 10 ⁇ 5 Torr and 850 ° C.
- the compacted body after deparaffinization treatment is enclosed in a metal capsule, the metal capsule is placed in an ultra-high pressure and high temperature generator, and sintered under a pressure of 5.5 GPa, a temperature of 1500 ° C., and a holding time of 30 minutes. Cubic boron nitride sintered bodies were obtained.
- the cross-sectional structure of the cubic boron nitride sintered body thus obtained was observed with an SEM and analyzed by EDS to determine the cBN content (% by volume) and the binder phase content (% by volume).
- the cubic boron nitride sintered body was measured by X-ray diffraction, and each phase (cBN, Ti (C 0.5 N 0.5 ), Ti (C 0.8 N 0.2 ), Ti (C 0.2 ) of the cubic boron nitride sintered body was measured.
- N 0.8 were identified TiN, a TiB 2, Al 2 O 3, AlN , etc.).
- the powder blended at such a ratio was mixed well.
- the obtained mixed powder was subjected to X-ray diffraction measurement, the peak intensity of each phase was measured, and the peak intensity ratio of each phase to the peak intensity of cBN was calculated.
- a calibration curve showing the relationship between the peak intensity ratio of each phase with respect to the peak intensity of cBN and the composition (volume%) of each phase was obtained.
- the content (volume%) of each phase other than cBN contained in the cubic boron nitride sintered body is determined from the peak intensity ratio of each phase other than cBN in the cubic boron nitride sintered body. It was. Further, the fracture toughness value K 1C of the cubic boron nitride sintered body was measured.
- X-ray-diffraction apparatus RINT TTRIII output: 50 kV, 250 mA, incident side solar slit: 5 degrees, divergence longitudinal slit: 1/2 degree, divergence Vertical limit slit: 10 mm, scattering slit 2/3 °, light receiving side solar slit: 5 °, light receiving slit: 0.15 mm, BENT monochromator, light receiving monochrome slit: 0.8 mm, sampling width: 0.02 °, scan speed : 0.1 ° / min, 2 ⁇ measurement range: X-ray diffraction measurement of a 2 ⁇ / ⁇ concentrated optical system using Cu-K ⁇ rays was performed under the conditions of 40 to 46 °.
- the obtained X-ray diffraction pattern was peak-separated, and the (200) plane of titanium carbonitride (Ti (C 0.2 N 0.8 ), Ti (C 0.5 N 0.5 ) or Ti (C 0.8 N 0.2 )) after peak separation With respect to the diffraction line and the (200) plane diffraction line of titanium nitride (TiN), the Bragg angle 2 ⁇ , the peak intensity, and the half width were measured.
- the interval between the Bragg angle 2 ⁇ of the (200) plane diffraction line of titanium carbonitride and the Bragg angle 2 ⁇ of the (200) plane diffraction line of titanium nitride, titanium carbonitride (Ti (C 0.2 N 0.8 ), Ti (C 0.5 N 0.5) or Ti (C 0.8 N 0.2)) of the (200) plane of titanium nitride to the peak intensity I TiCN diffraction line (TiN) of the (200) plane peak intensity ratio of the peak intensity I TiN diffraction line (I TiN / I TiCN ) were calculated and are shown in Table 4.
- the sintered body was cut into a predetermined shape with a wire electric discharge machine, brazed to a cemented carbide base material, ground and finished to obtain a cutting tool having an ISO standard CNGA120408 cutting insert shape. Obtained.
- the following cutting tests (1) and (2) were performed using these cutting inserts. The results are shown in Table 5.
- the sintered body of the present invention has a higher fracture toughness value K 1C than the conventional cubic boron nitride sintered body. As a result, the fracture resistance at the time of cutting is increased, and the conventional product is improved in continuous cutting and weak interrupted cutting. It is less likely to cause defects.
- the ratio of the peak strength of titanium nitride to the peak strength of titanium carbonitride (I TiN / I TiCN ) is 0.1 to 0.5, particularly excellent cutting performance is exhibited and the tool life is long.
- Example 2 The surface of Invention 3 of Example 1 was coated using a PVD apparatus. Invention 6 was coated with TiN having an average film thickness of 3 ⁇ m, and Invention 7 was coated with TiAlN having an average film thickness of 3 ⁇ m. The inventive products 6 and 7 were subjected to the same cutting tests (1) and (2) as in Example 1. The results are shown in Table 6.
- Inventive products 6 and 7 coated with a coating film could have a longer tool life than the inventive product 3 coated with a coating film.
- the cubic boron nitride sintered body and the coated cubic boron nitride sintered body of the present invention are excellent in wear resistance, fracture resistance, and toughness, and can extend the tool life particularly when used as a cutting tool or wear resistant tool. So the industrial applicability is high.
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Abstract
Description
平均粒径2μmの立方晶窒化硼素(cBN)粉末、表1に示す平均粒径のTi(C0.5N0.5)粉末、Ti(C0.8N0.2)粉末、Ti(C0.2N0.8)粉末およびTiN粉末(いずれも金属元素と非金属元素の比率が原子比で1:1の化学量論組成であるTi化合物)、平均粒径2μmのAl粉末を用いて表1に示す配合組成に配合した。配合した原料粉末を超硬合金製ボールとヘキサン溶媒とパラフィンとともにボールミル用のシリンダーに入れてボールミル混合を48時間行った。ボールミルで混合粉砕して得られた混合粉末を圧粉成型した後、1X10-5Torr、850℃の条件で脱パラフィン処理をした。脱パラフィン処理をした圧粉成型体を金属カプセルに封入し、金属カプセルを超高圧高温発生装置に入れて、圧力5.5GPa、温度1500℃、保持時間30分の条件で焼結して、発明品および比較品の立方晶窒化硼素焼結体を得た。
外周連続乾式切削(旋削)、
被削材:SCM415H(HRC60.9~61.7)、
被削材形状:円柱φ63mm×L200mm、
切削速度:250m/min、
切込み:0.25mm、
送り:0.1mm/rev、
切削インサート形状:ISO規格CNGA120408、
評価:VBc=0.15mmに達するまでの切削時間あるいは欠損までの切削時間。
外周弱断続乾式切削(旋削)、
被削材:SCM435H(HRC60.9~61.7)、
被削材形状:90°V溝2本入り円柱φ48mm×L200mm、
切削速度:200m/min、
切込み:0.25mm、
送り:0.1mm/rev、
切削インサート形状:ISO規格CNGA120408、
評価:VBc=0.15mmに達するまでの切削時間あるいは欠損までの切削時間。
実施例1の発明品3の表面にPVD装置を用いて被覆処理を行った。平均膜厚3μmのTiNを被覆したものを発明品6、平均膜厚3μmのTiAlNを被覆したものを発明品7とした。発明品6、7について実施例1と同じ切削試験(1)(2)を行った。その結果を表6に示す。
2 ピーク分離した後の炭窒化チタンの(200)面回折線
3 ピーク分離した後の窒化チタンの(200)面回折線
4 ピーク分離した後の立方晶窒化硼素の(111)面回折線
Claims (5)
- 窒化チタンおよび炭窒化チタンを含有する結合相と立方晶窒化硼素と不可避的不純物とからなり、Cu-Kα線を用いたX線回折測定における、炭窒化チタンの(200)面回折線のブラッグ角2θと窒化チタンの(200)面回折線のブラッグ角2θとの間隔が0.30°以上0.60°以下であり、炭窒化チタンの(200)面回折線の半価幅が0.30°以上0.50°以下であることを特徴とする立方晶窒化硼素焼結体。
- 窒化チタンの(200)面回折線の半価幅が0.25°以上0.45°以下である請求項1に記載の立方晶窒化硼素焼結体。
- Cu-Kα線を用いたX線回折測定における、窒化チタンの(200)面回折線のピーク強度ITiCNに対する窒化チタンの(200)面回折線のピーク強度ITiNのピーク強度比(ITiN/ITiCN)が0.1~0.5である請求項1または2に記載の立方晶窒化硼素焼結体。
- 立方晶窒化硼素焼結体が、
酸化アルミニウム:立方晶窒化硼素焼結体全体に対して3~30体積%と、
窒化チタンと炭窒化チタンの合計:立方晶窒化硼素焼結体全体に対して10~60体積%と、
硼化チタン:立方晶窒化硼素焼結体全体に対して1~30体積%と、
窒化アルミニウムおよび硼化アルミニウムの1種または2種:立方晶窒化硼素焼結体全体に対して10体積%以下とからなる
合計して立方晶窒化硼素焼結体全体に対して20~80体積%の結合相と、
立方晶窒化硼素焼結体全体に対して80~20体積%の立方晶窒化硼素および不可避的不純物とから構成される請求項1~3のいずれか1項に記載の立方晶窒化硼素焼結体。 - 請求項1~4のいずれか1項に記載の立方晶窒化硼素焼結体の表面に被膜を被覆した被覆立方晶窒化硼素焼結体。
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US13/259,982 US20120035045A1 (en) | 2009-04-17 | 2010-04-16 | Cubic Boron Nitride Sintered Body and Coated Cubic Boron Nitride Sintered Body |
EP10764544.2A EP2420483B1 (en) | 2009-04-17 | 2010-04-16 | Cubic boron nitride sintered compact and coated cubic boron nitride sintered compact |
JP2011509370A JP5660034B2 (ja) | 2009-04-17 | 2010-04-16 | 立方晶窒化硼素焼結体および被覆立方晶窒化硼素焼結体 |
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CN104525935B (zh) * | 2014-12-12 | 2016-09-28 | 郑州博特硬质材料有限公司 | 一种高韧性立方氮化硼烧结材料及其制备方法 |
JP2019521941A (ja) * | 2016-06-02 | 2019-08-08 | エレメント シックス (ユーケイ) リミテッド | 焼結多結晶立方晶窒化ホウ素材料 |
JP2020203834A (ja) * | 2016-06-02 | 2020-12-24 | エレメント シックス (ユーケイ) リミテッド | 焼結多結晶立方晶窒化ホウ素材料 |
KR20210008147A (ko) * | 2016-06-02 | 2021-01-20 | 엘리먼트 씩스 (유케이) 리미티드 | 소결된 다결정성 입방정 질화 붕소 물질 |
KR102358312B1 (ko) | 2016-06-02 | 2022-02-08 | 엘리먼트 씩스 (유케이) 리미티드 | 소결된 다결정성 입방정 질화 붕소 물질 |
JP2023002580A (ja) * | 2016-06-02 | 2023-01-10 | エレメント シックス (ユーケイ) リミテッド | 焼結多結晶立方晶窒化ホウ素材料 |
WO2021182463A1 (ja) * | 2020-03-13 | 2021-09-16 | 三菱マテリアル株式会社 | 硬質複合材料 |
WO2022210771A1 (ja) * | 2021-03-31 | 2022-10-06 | 三菱マテリアル株式会社 | 掘削チップおよび掘削工具 |
WO2022210760A1 (ja) * | 2021-03-31 | 2022-10-06 | 三菱マテリアル株式会社 | 掘削チップおよび掘削工具 |
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EP2420483A4 (en) | 2012-10-24 |
EP2420483B1 (en) | 2016-09-28 |
EP2420483A1 (en) | 2012-02-22 |
JP5660034B2 (ja) | 2015-01-28 |
US20120035045A1 (en) | 2012-02-09 |
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