JPH0734157A - High strength diamond-metal composite sintered compact and its production - Google Patents

Abstract

PURPOSE:To facilitate the mass production of a high strength diamond-metal composite sintered compact and to enable the production of a large sized product of the sintered compact by specifying the binder and the sintering conditions in the production of the sintered compact which contains a diamond and a metallic binder as the binder. CONSTITUTION:In the production of this composite sintered compact, 1 to 90vol.% of a diamond powder and the remainder of a raw material of the metallic binder, 99 to 10vol.% of e.g. Ni3Al powder are mixed, wherein the metallic binder is obtained by sintering its raw material at <=1850 deg.C, under <2000MPa pressure in the solid phase and therefore has high strength of >= 100MPa strength at room temp. The mixture, as it is or after forming it, is sintered in the solid phase for an appropriate time under such sintering conditions of temp. and pressure of <=1850 deg.C and <=2000MPa respectively that the diamond is not thermodynamically stable, however it is metastable under the conditions. Thus the high strength diamond-metal composite sintered body, which contains substantially no graphite phase ans has high toughness and strength, can be produced and the disadvantageous need of using a device for generating a superhigh pressure exceeding 2000MPa can be eliminated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-strength diamond-metal composite sintered body containing diamond and using a metal binder as a binder, and a method for producing the same.

[0002]

2. Description of the Related Art Dense, high-strength, high-strength diamond-metal composite sintered compacts containing diamond and making use of the high toughness of a metal binder in applications such as wear resistant members and mechanical members In order to prevent the phase transition to and to sinter the high-strength diamond-metal composite sintered body densely and strongly, diamond is thermodynamically stable and is manufactured under ultra-high pressure and temperature exceeding 2000 MPa. Was. For example, T.NOMA et al.'S report (J. Mater. Scie. 19
(1984) 2319-2322), the diamond is 6000MPa
(60 kb), sintered at 1300 ° C or higher. This sintering condition is extremely severe as an extreme condition, and could not occur unless an ultrahigh pressure device such as a girdle type or belt type was used.

[0003]

[Problems to be solved by the invention] Therefore, 2000MPa
Due to the restriction of using the girdle-type or belt-type ultra-high pressure device that generates an ultra-high pressure exceeding 1, the high-strength diamond / metal composite sintered body is difficult to mass-produce, and the manufacturing cost is high, and the size is large. It was not possible to manufacture a shaped product.

However, according to Hall's experiments under ultrahigh pressure, the time required for the phase transition is extremely long when diamond is thermodynamically metastable even if it is not thermodynamically stable. Therefore, it has been reported that it exists in a stable state, and a line is shown as an upper limit of the stable state (HTHall, Science, 169 (1970) 868-86).
9). Therefore, according to this, even at low pressure and high temperature conditions that are not stable with respect to the thermodynamic equilibrium line, at a temperature that does not exceed the line, for example, when the pressure is up to about 35 kb, about 1400 K (about
Up to 1100 ° C), diamond is practically stable.

[0005]

[Figure 1]

That is, at the time of sintering a high-strength diamond-metal composite sintered body using a high-strength metal binder and diamond, at least it is effective only to promote the densification of the high-strength metal binder. If pressure is applied, it is possible to manufacture a high-strength diamond-metal composite sintered body,
An ultrahigh pressure device capable of acting a relatively gentle ultrahigh pressure of less than 2000 MPa, for example, a piston-cylinder (PC) type ultrahigh pressure device, or an ultrahigh pressure HIP device capable of pressurizing up to 1000 MPa as known technology, or Is hot isostatic pressurization (HIP: Hot Isostatic except for the ultra high pressure HIP device).
Press device or hot press (HP: Hot)
It is possible to use a Press device.

Therefore, for example, the PC type ultra high pressure device,
Alternatively, if a high-strength metal binder that can be sintered densely using an ultra-high pressure HIP device, or a HIP device other than the ultra-high pressure HIP device, or an HP device is searched for,
The PC type ultra-high pressure device, the ultra-high pressure HIP device, or the HIP device other than the ultra-high pressure HIP device, or HP
Depending on the device, 2000 MPa, such as the girdle type or belt type
Unlike the case of an ultra-high pressure device that generates an ultra-high pressure exceeding 1, the mass production is easy and a large-sized sintered body can be manufactured, so the above-mentioned drawbacks are solved.

[0008]

DISCLOSURE OF THE INVENTION The present invention is a PC type ultra high pressure device capable of operating a relatively gentle ultra high pressure of less than 2000 MPa, or an ultra high pressure HIP device capable of pressurizing up to 1000 MPa,
Alternatively, by using a HIP device or an HP device other than the ultra-high pressure HIP device, the temperature at which diamond actually exists in a stable state in each sintering environment is experimentally investigated, and at the same time, the temperature As a result of diligent research on the binder and its strength applicable as a metal binder which is dense and can be sintered with high strength, the diamond powder is 1% to 90% by volume, and the balance is 2000 MPa. A mixture of 99% to 10% by volume of a high-strength metal binder having a room temperature strength of 100 MPa or more, which is obtained by sintering at a temperature not exceeding 1850 ° C at a temperature of less than or equal to the pressure of the mixture. Is less than 2000MPa, the temperature does not exceed 1850 ℃, the diamond is not thermodynamically stable, but is sintered for a suitable time in a solid phase under metastable sintering conditions of pressure and temperature.・ Metal compound sintered body manufacturing method Or characterized in that produced by the production method of the high strength diamond metal composite sintered body, which has invented a high strength diamond metal composite sintered body, and provides them.

Description of Means Diamond Raw Material Diamond as a raw material powder of the present invention may be a natural product or a synthetic product. The particle size of the diamond is not particularly limited and is a size suitable for use as a product after sintering within a range that can be manufactured as the raw material, but a particle size of 10 μm or less is suitable for a mechanical member. is there. A particle diameter of 5 μm or less is suitable for a member that requires high strength and high toughness. In the case of a natural product, an ultra-high purity product can be selected, which is preferable. When diamond is a synthetic product, it is preferable to remove as much as possible the substance used as the catalyst during the synthesis in order to suppress the phase transition to these graphite phases. The most preferable example of the synthetic product is, for example, a physical vapor deposition method (PVD method) or a chemical vapor deposition method.
It is possible to select ultrahigh-purity diamond that is synthesized through the vapor phase by (CVD method). When synthesized into a thin film, crush and use it while paying attention to contamination by impurities. When it is synthesized in a granular or powder form, it can be used as it is. As a high-purity example other than this, a single crystal can be selected. Alternatively, diamond powder obtained by actively removing impurities can be selected. In addition, the dipping method using molten salt in the particles of the diamond raw material powder as the raw material
(For example, a molten salt immersion method described in JP-A-2-252660)
According to the above, when more than one coating material derived from the dipping method is coated, the coating material derived from the dipping method is coated as a dense hard film on the surface of each particle of the diamond powder. Body particles can be completely isolated from the atmosphere. Therefore, it becomes possible to select, as the metal binder and / or the fibrous substance, a substance which is difficult to apply because it has a high reactivity with the diamond or has a strong catalytic action to the diamond, and the high strength diamond-metal composite of the present invention can be selected. The range of application of metal binders and fibrous substances that can be used in the sintered body is dramatically expanded and suitable.

Metal Bonding Material On the other hand, as the metal bonding material according to the high-strength diamond-metal composite sintered body and the manufacturing method thereof of the present invention, a pressure of 2000
By sintering in a solid phase at a temperature of less than 1 MPa and not exceeding 1850 ° C., the metal binder having a high room temperature strength of 100 MPa or more is selected. Preferably further
The metal binder is selected which does not promote the phase transition of diamond to the graphite type phase under the sintering conditions of solid phase sintering at a pressure of less than 2000 MPa and not exceeding 1850 ° C.
Alternatively, a metal having a high hardness at room temperature strength of 100 MPa or more including a reaction product formed by reacting with a part of boron nitride by being sintered in a solid phase at a pressure of less than 2000 MPa and not exceeding 1850 ° C. The metal binder, which is a binder, is selected. More preferably, the metal binder is 185 at pressures less than 2000 MPa.
By solid phase sintering at a temperature not exceeding 0 ° C,
The strength of the metal binder has a positive temperature dependency having a positive correlation with temperature, and / or the high temperature strength at a high temperature of one or more selected from 300 ° C. to 1000 ° C. is 50 MPa.
High strength, and / or Vickers hardness over 150, high hardness, and / or L1 ₂ type, L1 ₀ type, DO ₁₉ inch, DO
_The metal binder is selected to include at least one selected _22- type intermetallic compound. Specifically, a high-strength metal binder having a room temperature strength of 100 MPa is obtained by sintering in a solid phase at a pressure of less than 2000 MPa and not exceeding 1850 ° C., and the periodic table 1a, 1b, 2a, 2b. , 3a, 3b, 4a, 4b, 5a, 5b, 6a, 6b,
A metal containing at least one selected from Group 7a, Group 8 metals, rare earth group metals, alloys containing one or more of these, and intermetallic compounds is selected. More specifically, for example, a high-strength metal binder having a room temperature strength of 100 MPa is Ni ₃ Ge, Ni ₃ Si, Ni obtained by sintering in a solid phase at a pressure of less than 2000 MPa and not exceeding 1850 ° C. ₃ Ga, Ni ₃ Al, Pt ₃ Sn, Pt ₄ Sb, Co
₃ Ti, Pd ₄ Ti, Pt ₃ Ti, Pt ₃ Ga, Pt ₃ Al, Pd ₃ Pb, Fe ₃ Ga, Zr ₃
Al, Zr ₃ In, Pt ₃ Cr, Pt ₃ Mn, Pt ₃ V, Pd ₃ Mn, Cu ₃ Au, Cu ₃ P
A material containing at least one selected from t, Cu ₃ Pd, TiAl, Ti ₃ Al and TiAl ₃ can be selected. The metal binder is a substance that does not act as a catalyst under the conditions of solid-state sintering at a metastable pressure and temperature, although diamond at a temperature of less than 2000 MPa and not exceeding 1850 ° C. is not thermodynamically stable. Can be applied to the high-strength diamond / metal composite sintered body of the present invention.

Fibrous substance The metal binder according to the present invention contains a fibrous substance composed of one or more kinds of metals or compounds having a minor axis of 500 μm or less and a ratio of the major axis to the minor axis of 2 or more. Therefore, the high-strength diamond / metal composite sintered body of the present invention can be expected to have higher toughness, which is preferable. In the present invention, the minor axis is
A rod-shaped substance having a shape of 500 μm or less and a ratio of the major axis to the minor axis of 2 or more and / or continuous fibers made of continuous fibers by melt-spinning to form a fiber shape and / or self-shaped fibers in which the crystal itself has a fiber shape And / or a whisker formed by unidirectional crystal growth into a fiber shape. The whiskers (whisker crystals) are defined as intrinsic whiskers and / or
Alternatively, a whisker in a broad sense that indicates a single crystal that has become a long needle-like crystal by growing only one crystal face of a crystal formed by a phase change or a chemical change over the entire volume, and / or
Alternatively, the whiskers are single crystals having a cross-sectional area of 8 × 10 ⁻⁵ in ² or less and a length of 10 times or more the average diameter.

As the fibrous substance, the periodic table 1b, 2
a, 3a, 4a, 5a, 6a, 7a, 8 group metal, rare earth metal, B, S
A fibrous substance made of i, Al, or one or more kinds of compounds containing one or more kinds thereof, and having a shape with a minor axis of 500 μm or less and a ratio of the major axis to the minor axis of 2 or more is used. In the compound, more specifically, the periodic table 1b, 2a,
3a, 4a, 5a, 6a, 7a, 8 group metal, rare earth metal, B, Si,
Al oxides, nitrides, carbides, oxynitrides, oxycarbides, carbonitrides, oxycarbonitrides, borides, containing one or more kinds of suicides, with a minor axis of 500 μm or less for the minor axis A fibrous substance having a shape having a ratio to the major axis of 2 or more is used. Preferably, for example, Ta, Zr, Cr, Si, C, W, B, Mo, Nb, V
, Al ₂ O ₃ , Fe ₂ C, B ₄ C, SiC, TiC, Fe ₃ C, Ta ₂ C, Nb ₂
A fibrous substance composed of one or more of C, Si ₃ N ₄ , Cr ₂ N, AlN, Si ₂ ON ₂ , and TiN and having a minor axis of 500 μm or less and a ratio of the major axis to the minor axis of 2 or more. Is selected. The fibrous substance has a higher melting point than the metal binder and has a higher pressure.
The diamond having a temperature of less than 2000 MPa and not exceeding 1850 ° C. is not thermodynamically stable, but under solid-state sintering conditions of metastable pressure and temperature, the substance having no catalytic action is the high strength diamond-metal composite of the present invention. It can be applied to a sintered body.

Upper limit of temperature Particularly high-purity diamond, for example, high-quality natural diamond or synthetic product, is ultra-high-purity diamond synthesized through a vapor phase by PVD method or CVD method, or over a long period of time. If ultra-high-purity diamond that has been synthesized under ultra-high pressure is used, it is degassed and encapsulated in a capsule capable of transmitting pressure to perform ultra-high pressure HIP sintering or HIP sintering, or HP sintering in vacuum or an inert gas. By carrying out, even if it is not in a thermodynamically stable state, diamond actually exists stably up to 1850 ° C., which is much higher than 1100 ° C. reported by Hall. However, when it exceeds 1850 ° C, it undergoes a phase transition to a graphite phase in a short time. Generally, in the case of synthetic diamond, a catalyst for synthesis may remain as impurities.
However, if one made of high-purity diamond obtained by actively removing impurities is used, both natural products and synthetic products will have diamond up to 1700 ° C. by the same sintering method. Alternatively, if a known diamond that does not contain fine particles and preferably has a particle size of 3 μm or more is used, diamond is present up to 1600 ° C. in both natural and synthetic products by the same sintering method. Alternatively, in the case of known relatively high-purity diamond, the diamond is present up to 1500 ° C. by the same sintering method in both natural products and synthetic products. However, in the case of known general synthetic diamond, the temperature up to 1400 ° C. is suitable.

Therefore, the upper limit of the sintering temperature is 1850 ° C.
As described above, the temperature at which the diamond used is not in a thermodynamically stable state but is actually stable differs depending on the quality of the diamond used, so the sintering temperature is set according to the quality of the diamond raw material. There is a need. When it is necessary to set the sintering temperature close to the temperature corresponding to the quality of the diamond raw material, it is necessary to carefully control the sintering temperature.

Range of Pressure As described above, the present invention provides a PC type ultrahigh pressure device or an ultrahigh pressure H type device capable of operating a relatively gentle ultrahigh pressure of less than 2000 MPa.
High-strength diamond using IP equipment, or HIP equipment excluding the ultra-high pressure HIP equipment or HP equipment
Regarding the production of metal composite sintered bodies, the upper limit of the sintering temperature is 1850.
C, and that in the sintering temperature range, it is not necessary to clarify the application conditions of the binder and to apply a pressure to bring the diamond into a thermodynamically stable state. It is a clarification.

Therefore, when the PC type ultra high pressure device is used, the pressure may be less than 2000 MPa, but it is 1500 when considering the durability of the PC type ultra high pressure device.
It is preferable not to exceed MPa. As a known technique for generating pressure, HIP pressure of up to 1000 MPa can be applied in the case of an ultra-high pressure HIP apparatus, and up to 200 MPa can be applied in the case of the HIP apparatus and HP apparatus excluding the ultra-high pressure HIP apparatus. Ultra high pressure HIP sintering or HIP
When sintering is performed, deaeration and encapsulation in a capsule capable of transmitting pressure is preferable because the pressure of the ultra-high pressure HIP device or the HIP device can reliably act on the high-strength diamond-metal composite sintered body. Known capsules such as glass capsules and metal capsules can be selected as the capsules.

The high-toughness high-strength diamond-metal composite sintered body obtained by sintering the metal binder by the above method preferably has a Vickers hardness of 500 or more as a high-strength wear resistant member or mechanical member. For a high-strength wear-resistant member or mechanical member subjected to more severe use conditions, a high-strength high-strength diamond-metal composite sintered body having a Vickers hardness of 1000 or more can be produced as a more preferable example.

The high-strength diamond-metal composite sintered body of the present invention and the method for producing the same will be described below with reference to examples.

[0019]

【Example】

Example 1 A high-strength diamond-metal composite sintered body using natural diamond powder particles as diamond powder particles and Ni ₃ Al powder particles as a raw material of a metal binder and a method for producing the same will be described in more detail. explain.

40% by volume of diamond powder particles (particle size 4 to 8 μm) and 60% by volume of Ni ₃ Al powder particles were wet mixed in acetone for 2 hours. Then, the mixed powder was vacuum dried at 10 ⁻⁶ torr and 200 ° C.

[0021] Then, embossing molded into a disk shape having a diameter of 16 mm, a thickness of 5 mm, the molded body was placed in Pyrex glass capsules filled with hBN powder, 10 ^-6 torr, 400
After degassing at ℃ for 12 hours, it was sealed.

The capsule is placed in a HIP device using argon gas as a pressure medium, and the sintering temperature is 1100 ° C. and the sintering pressure is 15
It was held at 0 MPa for 3 hours for sintering. Thereafter, the furnace was cooled, the pressure was released, and the sintered body was taken out.

The sintered body is very dense with a density of 100% within the measurement error range, and a compressive strength at room temperature of about 450 MPa.
The compressive strength at 600 ° C was 500 MPa. The Vickers microhardness was Hv (0.5 / 10): about 1100, which was a very high hardness.

When the crystal phase of the sintered body of Example 1 was examined by X-ray diffraction, diffraction peaks other than those of diamond and Ni ₃ Al were not recognized.

Example 2 40% by volume of natural diamond powder particles (particle size 4 to 8 μm) were used as diamond powder particles, and 60% by volume of NiAl powder particles were used as the raw material powder for the metal binder in acetone. 2 for medium and wet
Mixed for hours. Then, the mixed powder was vacuum dried at 10 ⁻⁶ torr and 200 ° C.

Next, a disk-shaped mold having a diameter of 16 mm and a thickness of 5 mm was embossed, and the molded body was placed in a capsule made of stainless steel foil filled with hBN powder, at 10 ⁻⁶ torr, 200 ° C. for 12 hours. After deaeration, it was sealed.

The capsule is placed in a HIP device using argon gas as a pressure medium, and the sintering temperature is 1100 ° C. and the sintering pressure is 15
It was held at 0 MPa for 3 hours for sintering. Thereafter, the furnace was cooled, the pressure was released, and the sintered body was taken out.

The sintered body was very dense with a density of 100% within the measurement error range, and the compressive strength at room temperature was about 450 MPa.
The compressive strength at 600 ° C was 300 MPa. The Vickers microhardness was Hv (0.5 / 10): about 1000, which was a very high hardness.

When the crystal phase of the sintered body of Example 2 was examined by X-ray diffraction, diffraction peaks other than those of diamond and NiAl were not recognized.

Example 3 High-strength diamond-metal composite firing using natural diamond powder particles as diamond powder particles, Ni ₃ Al powder particles as a raw material of a metal binder, and silicon carbide whiskers as a fibrous substance. It will be described in more detail by taking a tie and a manufacturing method thereof as an example.

36% by volume of diamond powder particles (particle diameter 4 to 8 μm), 54% by volume of Ni ₃ Al powder particles, silicon carbide whiskers (SiC: minor axis 0.5 μm, average length 30 μm). 10% by volume was wet mixed in acetone for 2 hours. Then 10 ^-6 torr,
The mixed powder was vacuum dried at 200 ° C.

[0032] Then, embossing molded into a disk shape having a diameter of 16 mm, a thickness of 5 mm, the molded body was placed in Pyrex glass capsules filled with hBN powder, 10 ^-6 torr, 400
After degassing at ℃ for 12 hours, it was sealed.

The capsule is placed in a HIP device using argon gas as a pressure medium, and the sintering temperature is 1100 ° C. and the sintering pressure is 15
It was held at 0 MPa for 3 hours for sintering. Thereafter, the furnace was cooled, the pressure was released, and the sintered body was taken out.

The sintered body was very dense with a density of 100% within the measurement error range, and the compressive strength at room temperature was about 550 MPa.
The compressive strength at 600 ° C was 600 MPa. The Vickers microhardness was Hv (0.5 / 10): about 1150, which was a very high hardness.

When the crystal phase of the sintered body of Example 3 was examined by X-ray diffraction, diffraction peaks other than those of diamond, SiC and Ni ₃ Al were not recognized.

Example 4 Natural diamond powder particles were used as the diamond powder particles, and titanium carbide (TiC) was added to the surface of the diamond powder particles to the diamond by an external addition of about 10% by volume. Was coated by a dipping method using a molten salt. A high-strength diamond-metal composite sintered body using TiAl powder particles as a raw material of the metal binder and a method for producing the same will be described in more detail.

Diamond powder obtained by coating the surface of diamond powder particles (particle size 4 to 8 μm) with titanium carbide (TiC) by external addition so that about 10% by volume is coated by a dipping method using a molten salt. The particles were 44% by volume and TiAl powder particles were wet mixed in acetone for 2 hours. Then 10 ^-6 torr, 200
The mixed powder was vacuum dried at ℃.

Then, a disc-shaped mold having a diameter of 16 mm and a thickness of 5 mm was embossed, and the molded body was placed in a capsule made of Pyrex glass filled with hBN powder, and a pressure of 10 ^-6 torr, 400
After degassing at ℃ for 12 hours, it was sealed.

The capsule is placed in a HIP device using argon gas as a pressure medium, and the sintering temperature is 1100 ° C. and the sintering pressure is 15
It was held at 0 MPa for 3 hours for sintering. Thereafter, the furnace was cooled, the pressure was released, and the sintered body was taken out.

The sintered body was very dense with a density of 100% within the measurement error range, the compressive strength at room temperature was about 2500 MPa, and the compressive strength at 700 ° C. was 350 MPa. The Vickers microhardness was Hv (0.5 / 10): about 650, which was a very high hardness.

When the crystal phase of the sintered body of Example 4 was examined by X-ray diffraction, diffraction peaks other than those of diamond, TiC and TiAl were not recognized.

[0042]

The high-strength diamond-metal composite sintered body of the present invention and the method for producing the same have a diamond powder content of 1% by volume.
~ 90%, the balance is a high-strength metal binder having a room temperature strength of 100 MPa or more by sintering at a pressure of less than 2000 MPa and not exceeding 1850 ° C. % Or 10%, the pressure is less than 2000 MPa, the temperature does not exceed 1850 ° C, the diamond is not thermodynamically stable, but the pressure is metastable.
Characterized in that it is produced by a method for producing a high-strength diamond / metal composite sintered body that is sintered in a solid phase for a suitable time under a temperature sintering condition, or by a production method for the high-strength diamond / metal composite sintered body. It is intended to provide a high-strength diamond-metal composite sintered body, and it is possible to produce a high-strength diamond-metal composite sintered body that does not substantially contain a graphite type phase and has high toughness and high strength by a metal binder. , 20
The constraint drawback of using an ultra-high pressure generator to generate ultra-high pressure above 00 MPa is eliminated. In particular, when the ultra-high pressure HIP device or the HIP device other than the ultra-high pressure HIP device is used, it is possible to manufacture a sintered body having a more complicated shape, and the present invention has great advantages in industrial production.

[Brief description of drawings]

FIG. 1 is a pressure / temperature diagram showing a stable region of diamond.

[Explanation of symbols] Thermodynamic equilibrium line of diamond Line where diamond is actually stable according to Hall's report

Claims (15)

[Claims] 1. The volume of diamond powder is 1% to 90%,
The balance is a high-strength metal binder with a room temperature strength of 100 MPa or more by being sintered in a solid phase at a pressure of less than 2000 MPa and not exceeding 1850 ° C.
After mixing or molding a mixture of 99% to 10%, the pressure is less than 2000 MPa, the temperature does not exceed 1850 ° C, the diamond is not thermodynamically stable, but a metastable pressure
A method for producing a high-strength diamond / metal composite sintered body, which comprises sintering in a solid phase for an appropriate period of time under temperature sintering conditions. 2. Room temperature strength of 100M is obtained by sintering in a solid phase at a pressure of less than 2000MPa and not exceeding 1850 ° C.
The production of a high-strength diamond-metal composite sintered body according to claim 1, wherein the high-strength metal binder of Pa or more is a metal binder which does not promote the phase transition of the diamond into a graphite type phase. Law. 3. Room temperature strength of 100M is obtained by sintering in a solid phase at a pressure of less than 2000MPa and not exceeding 1850 ° C.
High-strength metal binder of Pa or more, high temperature strength of 50MP at high temperature of one or more selected from 500 ℃ to 1000 ℃
The method for producing a high-strength diamond-metal composite sintered body according to claim 1 or 2, wherein the metal binder is a or more. 4. Room temperature strength of 100 M is obtained by sintering in a solid phase at a pressure of less than 2000 MPa and not exceeding 1850 ° C.
High-strength metal binder with Pa or higher has Vickers hardness of 150
The method for producing a high-strength diamond / metal composite sintered body according to claim 1, 2, or 3, which is the above metal binder. 5. Room-temperature strength of 100 M is obtained by sintering in a solid phase at a pressure of less than 2000 MPa and not exceeding 1850 ° C.
The high-strength Pa metallic binder comprises one or more selected metallic binders whose strength has a positive temperature dependence. The method for producing the high-strength diamond / metal composite sintered body according to claim 3 or 4. 6. Room temperature strength of 100 M is obtained by sintering in a solid phase at a pressure of less than 2000 MPa and not exceeding 1850 ° C.
The high-strength metallic binder of Pa comprises at least one selected from L1 ₂ type and / or L1 ₀ type and / or D0 ₁₉ type and / or D0 ₂₂ type intermetallic compounds. The method for producing a high-strength diamond-metal composite sintered body according to claim 1, claim 2, claim 3, claim 4, or claim 5. 7. Room-temperature strength of 100 M is obtained by sintering in a solid phase at a pressure of less than 2000 MPa and not exceeding 1850 ° C.
The high-strength metal binder of Pa is the periodic table 1a, 1b, 2a, 2
b, 3a, 3b, 4a, 4b, 5a, 5b, 6a, 6b, 7a, 8 group metal, rare earth group metal or alloy containing one or more of these, selected one of intermetallic compounds The method for producing a high-strength diamond / metal composite sintered body according to claim 1, claim 2, claim 3, claim 4, claim 5, or claim 6, characterized by including the above. 8. A room temperature strength of 100 M is obtained by sintering in a solid phase at a pressure of less than 2000 MPa and not exceeding 1850 ° C.
High-strength metal binder of Pa is Ni ₃ Ge, Ni ₃ Si, Ni ₃ Ga, Ni ₃
Al, Pt ₃ Sn, Pt ₄ Sb, Co ₃ Ti, Pd ₄ Ti, Pt ₃ Ti, Pt ₃ Ga, Pt ₃ A
l, Pd ₃ Pb, Fe ₃ Ga, Zr ₃ Al, Zr ₃ In, Pt ₃ Cr, Pt ₃ Mn, Pt
₃ V, Pd ₃ Mn, Cu ₃ Au, Cu ₃ Pt, Cu ₃ Pd, Ti ₃ Al, TiAl, TiAl ₃
1. One or more selected from the above are included, claim 1, claim 2, claim 3, claim 4, claim 5,
A method for producing the high-strength diamond / metal composite sintered body according to claim 6 or 7. 9. Room-temperature strength of 100 M is obtained by sintering in a solid phase at a pressure of less than 2000 MPa and not exceeding 1850 ° C.
A high-strength metallic binder of Pa is characterized by comprising a fibrous substance composed of one or more kinds of metals or compounds having a minor axis of 500 μm or less and a ratio of the major axis to the minor axis of 2 or more The method for producing a high-strength diamond-metal composite sintered body according to claim 1, claim 2, claim 3, claim 4, claim 5, claim 6, claim 7, or claim 8. 10. The fibrous substance having a shape in which the minor axis is 500 μm or less and the ratio of the major axis to the minor axis is 2 or more is obtained by the periodic table 1b, 2a, 3a, 4a, 5a, 6a, 7a, A shape having a minor axis of 500 μm or less and a ratio of the major axis to the minor axis of 2 or more that is made of one or more kinds of Group 8 metal, rare earth metal, B, Si, Al, or a compound containing one or more kinds of these The method for producing a high-strength diamond-metal composite sintered body according to claim 9, wherein the method comprises the fibrous substance. 11. A fibrous substance having a shape in which the minor axis is 500 μm or less and the ratio of the major axis to the minor axis is 2 or more is a periodic table 1b, 2a, 3a, 4a, 5a, 6a, 7a, Contain one or more of Group 8 metal, rare earth metal, B, Si, Al oxides, nitrides, carbides, oxynitrides, oxycarbides, carbonitrides, oxycarbonitrides, borides, silicides The high-strength diamond-metal composite sintered body according to claim 9 or 10, which is made of a fibrous substance having a minor axis of 500 µm or less and a ratio of the major axis to the minor axis of 2 or more. Manufacturing method. 12. The fibrous substance having a shape in which the minor axis is 500 μm or less and the ratio of the major axis to the minor axis is 2 or more is Si.
_{C, TiC, B 4 C,} Si 3 N 4, AlN, TiN, Al 2 O 3, C, W
, B, Mo, Nb, Ta, V, and Zr have a minor axis of 500 μm or less and a ratio of the major axis to the minor axis of 2 or more. A method for producing the high-strength diamond-metal composite sintered body according to claim 9, 10, or 11. 13. The diamond powder particles are particles of diamond powder coated with one or more coating substances derived from the dipping method by a dipping method using a molten salt. The high strength diamond according to claim 2, claim 3, claim 4, claim 5, claim 6, claim 7, claim 8, claim 9, claim 10, claim 11, or claim 12. -Method for manufacturing a metal composite sintered body. 14. A dense high-strength diamond having a density of 95% or more by sintering the high-strength diamond-metal composite sintered body in a solid phase at a pressure of less than 2000 MPa and not exceeding 1850 ° C. -Claim 1, claim 2, claim 3, claim 4, claim 5, claim 6, claim 7, claim 8, claim 9, characterized in that it is a metal composite sintered body. The method for producing a high-strength diamond-metal composite sintered body according to claim 10, claim 11, claim 12, or claim 13. 15. A high-strength diamond / metal composite sintered body produced by the method for producing a high-strength diamond / metal composite sintered body according to claim 1. Description: