JPS62180737A - Device for compressing diamond or synthetic material of cubic boron nitride base at high temperature - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an apparatus for compressing diamond or cubic (11-nitride based synthetic materials) at high temperatures.
In particular, it relates to high-pressure treatment of the above-mentioned synthetic materials.

This invention makes it possible to put powder metallurgy into practical use for manufacturing drills, gelain tools, parts that wear out during use, and the like.

[Conventional technology and its problems]

Apparatus for compressing two-layer composites of diamond or cubic boron nitride into hard alloy materials at high temperatures is known (USSR, Inventor's Certificate, No. 86996).
No. 8, 822F 3/14゜1981).

A conventional device of this type includes a pair of dies that house a container, the container having a space for housing two layers of composite material with a gap between them. The current supply devices are mounted on both end faces of the material and within the inner diameter of the material. The gap is tightly packed with iron-based powder (or a mixture of iron-based metal powders), which is applied at a pressure of 45-100 Kbar and 1
It is compressed at a temperature of 450-1470°C.

Composite materials produced by hot compression in this type of equipment are coated with a layer of metal, often made of iron, which is difficult to separate and must be separated mechanically. It has become.

Further, as the synthetic material substrate is compressed, the quality of the material deteriorates as the molten metal soaks into the synthetic material, and the tightness of the synthetic material is loosened by a significant amount.

These are removed from the container and separated from the synthetic material, but the synthetic material produced in this way has extremely low durability.

On the other hand, devices are known for compressing synthetic materials based on diamond or cubic boron nitride at high temperatures, made of a matrix of transition metals that are difficult to dissolve (French Patent No. 2089414, 822F; 310o, 19
72).

This type of device has a pair of dies that house a container inside, and the container is surrounded from the outside by an additional member, which is installed in the area formed between the opposing surfaces of the pair of dies. has been done. A graphite sleeve containing a material made of synthetic material is mounted coaxially inside the container and is connected to the
Flow supply devices are attached to both end faces of the graphite sleeve.

However, the compressibility of the synthetic material is different from that of graphite, which is the material of the sleeve, and there is a problem in that excessive stress is applied to the shape during compression. High stresses can therefore cause the composite material to tear, and when the load is removed, the internal
There is a problem in that the durability of the synthetic material made with the known equipment is significantly reduced as a result of the formation of cracks.

[Purpose of the invention]

SUMMARY OF THE INVENTION Therefore, the object of the present invention is to solve the above-mentioned problems of conventional equipment, to prevent the tearing phenomenon of synthetic materials, and to prevent the occurrence of cracks. The object of the present invention is to provide an apparatus for compressing diamond or cubic nitrogen based synthetic materials at high temperatures.

[Failure to solve the problem]

To achieve the above object, the present invention includes a pair of dies, a container placed in a cavity of the pair of dies, and a sealing device for protecting the container from the outside in an area between both dies. , a graphite sleeve accommodated in the container, a material made of a synthetic material installed coaxially with the container inside the graphite sleeve, and a diamond having a current supply device and a square on both end faces of the material. Alternatively, in an apparatus for compressing a synthetic material based on cubic boron nitride at high temperatures, an annular space formed of a metal-based material is placed in an annular space formed by the outer circumferential wall of the graphite sleeve and the wall of the container. It is characterized by the fact that it is equipped with a sleeve.

While the two sleeves are compressed at high temperatures, they fuse together without separating, preventing the rapid relaxation of stress on the composite material that would cause the tearing phenomenon and cracking described above when the load is removed. ing.

To further improve the quality of the synthetic material, in the disclosed device the outer circumferential wall of the sleeve formed of a metal-based material is fitted tightly to the wall of the container, and the inner circumferential wall of said sleeve is fitted with a graphite sleeve. It is advisable to have a device that fits tightly against the outer wall.

Additionally, in the disclosed device, the sleeve formed of metal-based material may be formed of a mixture of 30-80% by volume metal or mixed metal and 20-70% by volume filler. It's a good idea. When the synthetic material is compressed at high temperatures, it becomes a solid body together with graphite, and easily forms a sleeve of a certain shape.

Therefore, the sleeve in question is made of 80% volume aluminum and 20% volume talc, or 30% volume iron and 7
Preferably, it is made of synthetic material with 0% volume sodium chloride.

Going further, the sleeve in question contains 20% nickel by volume, 20% manganese by volume and 60% graphite by volume.
Alternatively, it is preferably made of a composite material of 30% manganese by volume and 70% boron nitride by volume.
´ □ However, extremely hard materials such as diamond or cubic boron nitride are formed as a result of the additive process during which the selected composite metal-based materials are compressed at high temperatures. .

〔Example〕

A preferred embodiment of the present invention will be described in detail below.

In FIG. 1, the apparatus for compressing diamond or cubic boron nitride-based synthetic materials at high temperatures according to the present invention has a pair of dies 1, each of which is made of a metal outer cylinder. □ is firmly installed within 2. In the area between the pair of dies 1 , a container 3 surrounded from the rim by a sealing device 4 is mounted in a cavity formed in each die 3 . Inside the container 3 there is a graphite sleeve 5 in which a blank 6 made of the synthetic material is housed coaxially with the container.

The outer peripheral wall 7 of the sleeve 5 and the wall 8 of the container 3 form an annular space, and a sleeve 9 is installed in the annular space. The sleeve 9 is made of a metal-based material consisting of 30-80% by volume metal or mixed metal and 20-70% by volume filler.

Sleeve 9 made of a material containing less than 20% volume filler and 80% more metal or mixed metal
is difficult to compress.

On the other hand, materials containing more than 70% by volume of filler and less than 30% by volume of metal or mixed metals have a detrimental effect on the strength of the sleeve 9. The above metal components include iron,
Nickel, manganese and magnesium are preferred;
Suitable fillers include talc, graphite, sodium chloride, and boron nitride.

It is also preferred that the outer circumferential wall of the sleeve 9 fits tightly to the wall 8 of the container 3 and the inner circumferential wall of the sleeve 9 fits tightly to the outer circumferential wall 7 of the sleeve 5. This is because these materials are formed during compression at high temperatures and require a rigid structure.

In FIG. 2, devices for supplying current to the shape of a contact ring 10 having the same outer diameter as the outer diameter of the sleeve 9 are provided on both end faces of the graphite sleeve 5 coaxially therewith. The contact ring 10 is made of a mixed material of special graphite and slate-like limestone or sodium chloride.

Each of the contact rings 10 is fitted over an insulating disc 11;
A graphite disk 12,13 whose diameter is identical to the outer diameter of the contact ring 10 is provided on both sides 9 of the sleeve 5,
The graphite sleeve 5 is connected to a contact ring 10 which is supplied with electric current.
and the compressed material 6.

The disks 14 are formed of a metal-based material containing either graphite or boron nitride, and each disk 14 is sandwiched between disks 12.13. This will increase the amount of extremely hard material (diamond and cubes (boron nitride) obtained in the process).

By applying a supply pressure of 5 to 1 QQ kbar, the device for compressing synthetic materials at high temperatures is subjected to a compressive load on the shaft. The die 1 approaches the other die 1 and compresses the container 3 with the sealing device 4. The graphite sleeve 5 containing the blank 6 made of synthetic material and the sleeve 9 made of metal-based material are similarly compressed while placed in the container 3. The metal particles of the material of the sleeve 9 then penetrate the graphite forming the sleeve 5 due to the applied pressure.

At the same time, the material of the container sandwiched between the pair of dies 1 forms a closed annular body, and this annular body serves as a high-pressure seedling. The sealing device 4 formed in a thin shape easily holds down the shape of the annular body.

In the course of applying the required pressure, the blank 6 made of synthetic material is heated to 1000 by the electric current supplied through the contact ring 10, the disc 12.
It is heated from ℃ to 2700℃. Since the contact ring 10 is in contact with the die 1, a high stress is applied thereto.

The synergistic effect of high pressure and high temperature supported by the diamond or cubic III nitride based synthetic material binds the metal based material of sleeve 9 and the graphite of sleeve 75 within a certain time range to form a solid body. Make it. When the current is cut off, the heat in the parts of the device is dissipated and cooled, and the device cools down.

During the cold n1 cycle, the device is depressurized and pressurized. Stress is created in synthetic materials as they gradually release compression at high temperatures;
This weakens the solid bond formed by sleeves 5 and 9. In this case, no tearing phenomenon or slight racking occurs; 1. The wear resistance of synthetic materials increases. The synthetic material thus produced is easily removed from the device.

. The wear resistance and abrasion resistance of diamond-based materials (and 111M nitride or diamond, which wears away for a unit amount during grinding with a stone wheel) is 92% fine.
of tungsten carbide, 6% by mass of cobalt and 2% by mass of diamond, obtained by compressing in the disclosed apparatus 1.5-1.6 η/K
It was g. In that case, the material of the sleeve 9 is 80% aluminum by volume and 20% talc by volume.

Resistance of synthetic materials)? The abrasion resistance was determined by hot pressing in the disclosed equipment a composite material containing 93% by weight tungsten carbide, 6% by weight cobalt and 1% by weight cubic boron nitride, from 2.5 to 3. tyt /
It was kg. In that case, the material of the sleeve 9 is 30
% volume of magnesium and 70% volume of boron nitride. As part of its treatment, 8.2 carats of cubic boron nitride were produced in each cycle of high temperature compression.

Diamond-based material R (7) Wear resistance and purity are 92%
Tungsten carbide by mass, 6%! it's Kobal I~
and 1 g of synthetic material containing 2% virgin diamond by hot compression in the disclosed apparatus, and 1.4
~1.5η/'J.

In that case, the material of the sleeve 9 is 20% by volume of nickel,
20% manganese by volume and 60% graphite by volume.

Additionally, 9.5 carats of diamonds were created in each cycle of high temperature compression.

The wear resistance of the Daisemond-based material is 92% by mass 2% ungsten carbide, 6% by mass cobalt and 2% by mass.
It was obtained by BQ compression of diamond with 0% T4 content in the disclosed apparatus and was 1.4-1.5 η/Kg. In that case, the material of the sleeve 9 is 30% by volume iron and 7
0% volume sodium chloride.

The wear resistance of diamond-based materials is obtained by hot pressing 92% by mass tungsten carbide, 6% by mass and 2% by mass diamond in the apparatus disclosed in French Patent No. 2089415, which .2~2.5111! J / / (It was 9.

〔Effect of the invention〕 .

According to the device according to the invention, the wear resistance of synthetic materials is increased by a factor of 1.5 compared to the wear resistance of synthetic materials made with the device disclosed in French Patent No. 2089415. I can do it.

[Brief explanation of drawings]

1 is a schematic front sectional view of the device according to the invention, and FIG. 2 is an enlarged perspective view of the sleeve, the material made of synthetic material and the current supply device according to the invention. 1...Dice, 2...Outer tube, 3...Container, 4...
- Sealing device, 5... graphite sleeve, 6... material made of synthetic material, 7... outer peripheral wall of sleeve 5, 8.
... Wall of container 3, 9 ... Sleeve made of metal-based material, 10 ... Contact ring, 11 ... Insulating disk, 12° 13 ... Graphite disk, 14 ... Metal base A disc made of material.

Claims (1)

[Claims] 1. A pair of dies (1), a container (3) installed in a cavity of each die (1), and a container (3) installed from the outside within a gap between each die (1). a sealing device (4) for protecting the
a graphite sleeve (5) mounted on the container (3); a material (6) made of a synthetic material mounted coaxially with the container (3) inside the graphite sleeve (5); 6) in a device for compressing synthetic materials based on diamond or cubic boron nitride at high temperatures, with a current supply device mounted on both end faces of the outer circumferential wall (7) of said graphite sleeve (5) and said vessel; A synthetic material based on diamond or cubic boron nitride, characterized in that an annular sleeve (9) formed of a metal-based material is fitted in the annular space formed by the wall (8) of (3). A device for compressing at high temperature. 2. Sleeve (9) formed of the metal-based material
characterized in that the outer circumferential wall of the container (3) is tightly adapted to the wall (8) of the container (3) and the inner circumferential wall of the sleeve (9) is tightly adapted to the outer circumferential wall (7) of the graphite sleeve (5). Apparatus for compressing diamond or cubic boron nitride based synthetic materials at high temperatures as claimed in claim 1. 3. The sleeve (9) is made of a metal material containing 30-80% by volume of metal or mixed metal and 20-70% by volume of filler. Apparatus for compressing diamond or cubic boron nitride based synthetic materials at high temperatures as described in . 4. Diamond or cubic boron nitride according to claim 3, characterized in that the sleeve (9) is made of a material consisting of 80% aluminum and 20% talc by volume. Equipment for compressing base synthetic materials at high temperatures. 5. Diamond or cubic boron nitride according to claim 3, characterized in that the sleeve (9) is made of a material consisting of 30% by volume iron and 70% by volume lydium chloride. Equipment for compressing synthetic materials based on high temperatures. 6. The sleeve (9) has 20% volume of nickel and 2
Compacting at high temperatures a diamond or cubic boron nitride-based synthetic material according to claim 3, characterized in that it is formed of a material consisting of 0% manganese by volume and 60% graphite by volume. equipment for. 7. Diamond or cubic boron according to claim 3, characterized in that the sleeve (9) is made of a material consisting of 30% volume magnesium and 70% volume boron nitride. Equipment for compressing nitride-based synthetic materials at high temperatures.