JPH01131097A - Synthesis of diamond through vapor-phase method - Google Patents

Abstract

PURPOSE:To obtain diamond composite which can be directly applied to production of whetstones through high operability by forming diamond on the flake particles of Y or copper or copper-zinc alloy by the vapor-phase method. CONSTITUTION:Diamond is allowed to grow by the vapor-phase method on the surfaces of flake particles of yttrium, copper or copper-zinc alloy. The resultant diamond composite can be directly used in the production of whetstones without any operation such as separation. The flake particles of Y, Cu or its alloy acts as a binder for diamond in the production of whetstone. Further, if the composite product is treated with an acid to remove the flakes of metal, diamond particles can be utilized.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a method for synthesizing diamond by a vapor phase method, and is particularly suitable as a raw material for manufacturing metal bond diamond cutting saws, cutting, polishing, grinding wheels, etc. This paper relates to a method for synthesizing diamond by a vapor phase method, which can be used as diamond grains by separating diamond from diamond.

<Prior art> Conventionally, metal-bonded products such as tire cutting saws, cutting, polishing, and grinding wheels are made by combining, for example, crushed natural diamonds, synthetic diamond particles produced by an ultra-high pressure method, or their crushed products with metal powder as a binder. It is manufactured by mixing and pressure molding using a hot press.

<Problem to be solved by the invention> To put the conventional method more specifically, metal bond diamond cutting saws, cutting, polishing, grinding wheels, etc. grind diamond grains as necessary and then grind them to a predetermined particle size. After classification, it is mixed with a metal binder and molded to produce it.

In addition, in recent years, research has been conducted on the synthesis of diamond by the vapor phase method, but in this case, as a general rule, a substrate is used to grow diamond crystals on the substrate, so it is difficult to peel it off from the substrate, adjust the binder, etc. To classify diamond grains, it is necessary to mix them with a metal binder and mold them in the same way as in the method described above. All of these methods require various steps such as adjusting diamond grains and mixing with metal binder.

The present inventors utilize vapor phase diamond manufacturing to not only produce diamond grains but also to complete the above-mentioned complicated process.
- The present invention was completed as a result of intensive research aimed at obtaining a tire cent that is suitable as a raw material for forming grindstones and the like.

<Means for Solving the Problems> To achieve the above object, the present invention provides a tire cent, which is characterized in that tire cent is produced on the surface of flaky granules of yttrium, copper, or copper-zinc alloy by a vapor phase method. Concerning a method of synthesizing.

Flake-like particles such as copper and yttrium that produce diamonds on the surface play a role as a binder for tire cents during the forming of grindstones and the like. Further, after forming diamonds on the surface of the granules, for example, the granules are dissolved and separated with acid etc. to obtain tire cent particles,
You can also use this.

Further, the grains are in the form of flakes obtained by mechanical means, such as processed powder obtained by processing raw materials with gilt copper or a file. Flake-like particles include flat particles with a minimum or maximum three-dimensional dimension of 173 or less, such as those shaped like shavings produced when sharpening a pencil with a knife, and which may be warped or have a large number of There may be micro-cracks in the
It also contains mackerel-like substances. Processed powder is 0.1 ILm~1
0000 p, m can be widely used, preferably in the range of 10 pm to 500 gm. These processed powders have active sites on their surfaces, and large-diameter processed powders tend to have a high nucleation density of tire cent crystal growth at their edges.

The method of the present invention can be applied as a conventional gas phase method. For example, particles for growing tire cents may be dispersed on a substrate in a state where they can float as in the usual gas phase method, or they may be made to flow, float, or fall in a space excited to a state where they can produce tire cents. You can.

Most of the tire cent generated on the surface of flaky particles is fine tire cent, and most of them are 0.1 lm to 30A.
It is Lm. Tiemon 1 has the characteristics that the particle size can be controlled by the reaction conditions, especially the reaction surface, and the particle size distribution is sharp.

In the vapor phase Tirescent synthesis of the present invention, the resulting crystal grain size distribution is very sharp, and the particle shape is similar to that of a hexahedral to octahedral single crystal in the conventional ultra-high pressure method, or A shape having a large number of protrusions can also be easily deposited. Also, the generated tire cent can be controlled arbitrarily, whether it is pure or mixed with i-carbon.

The tire cent obtained by the method of the invention is a composite with grains containing copper or copper-zinc alloy or yttrium, which acts as a binder.

As a result, it is possible to manufacture metal cutting saws, cutting, polishing, and grinding wheels. For example, the desired object can be manufactured by putting the required amount into a mold, heating and pressurizing it. If the amount of binder is insufficient, it is easy to add it.

<Effects of the Invention> The tire cent composite produced by the method of the present invention can be manufactured directly using a metal real tire cent cutting saw, cutting, polishing, or a grinding wheel, and can be produced without pulverizing the raw material as in the conventional method. This eliminates the need for classification, eliminates the need for adjusting the amount of binder, or eliminates the need for measures such as adjusting the amount of binder, or is extremely simple, thereby shortening the manufacturing process.

In addition, the gap between the metal and tire cent can be used as diamond particles.

<Example> Next, the present invention will be explained with reference to examples.

Example 1 A hot filament vapor phase tire cent synthesis apparatus having a reaction space of about 2 liters was used.

A flaky powder obtained by sanding a copper plate and a yttrium plate (average particle size: 320, ] 26 μm to 52 g, m
) was mixed and suspended by ultrasonic dispersion in methanol, and this suspension was dispersed on a 20 mm x 20 mm silicon wafer.

A silicon wafer in which this suspension was dispersed was mounted on a substrate holder in a synthesis apparatus.

Filament humidity 2200°C, substrate temperature 700°
Hydrogen gas containing 1.5% by volume of t-phthanol was introduced into the apparatus at a rate of 100 NCC/min for 1 hour.

As a result of examining the substrate using an optical microscope, it was confirmed that a large number of Tiremont euhedral grains with a diameter of 5 to 6 m had precipitated and grown on the flaky powder.

The same operation was repeated 20 times, and the product on the silicon wafer was scraped off, to obtain a composite in which 97.4111 g of copper and yttrium had Tire mondo euhedral growth on each. 20 mg of powdered sintering copper powder was further added to this composite, mixed and placed in a 10 mm x 5 mm mold.
50°C, heated and pressurized to 15Kg/cm22
It was held for 0 minutes.

The resulting molded body had an average thickness of 0.26+nm. The surface of the molded product was observed under a microscope, and it was confirmed that Tiremont crystal particles were present on the surface.

When this molded body was attached to a metal block and pressed and polished on the cast iron surface, many striations caused by tire cent particles were obtained on the cast iron surface. It was also confirmed using a microscope that there were almost no tire particles falling off the surface of the molded product.

Example 2 Using the same vapor phase Tiemon synthesis apparatus as in Example 1, 5
A methanol suspension was made in the same manner as in Example 1 using a processed powder prepared by filing a mmφ brass rod,
It was dispersed on a 20+n+nX 20 mm silicon wafer and attached to a substrate holder.

Filament temperature: 2250°C1 Substrate temperature: 600°C
150% of hydrogen gas containing 0.8% by volume of acetone.
cc for 7 minutes and introduced into the device for 2 hours.

As a result of examining the substrate using an optical microscope, it was confirmed that many grains with an average grain size of 7.3 JLm, in which self-shaped tires appeared, were precipitated on the powder. In addition, a tire mont peak was confirmed by X-ray diffraction.

Claims (1)

[Claims] A method for synthesizing diamond, characterized in that diamond is produced on the surface of flaky granules of yttrium, copper, or copper-zinc alloy by a vapor phase method.