CN103949187A - Coarse particle polycrystalline diamond synthesizing technology - Google Patents

Abstract

The invention discloses a coarse particle polycrystalline diamond synthesizing technology. Coarse particle polycrystalline diamond is generated by controlling the variation of heating power and pressure intensity. The coarse particle polycrystalline diamond synthesizing technology provided by the invention has the beneficial effects that the synthesized polycrystalline diamond is irregular in shape, is rough in surface, has large particles and little impurities, is dark green, and has extremely good self-sharpening capability and good thermal stability.

Description

A kind of coarse granule polycrystalline diamond synthesis technique

Technical field

The present invention relates to diamond production field, relate in particular to a kind of coarse granule polycrystalline diamond synthesis technique.

Background technology

Diamond is the superhard material that hardness is very high, is mainly used in making various diamond tools, as grinding tool, wire drawing die, cutting tool and boring means etc.The diamond of producing in the world mainly be take monocrystalline as product, obtains a wide range of applications.Artificial in the majority with monocrystalline with natural diamond, crystal itself is exactly a complete large crystal grain.Monocrystalline is the individual particle with perfect crystal profile, and the lattice of granule interior is periodic arrangement, has anisotropy; Polycrystalline is that a particle the inside has a plurality of crystal grain, and the lattice of each crystal grain is periodic arrangement, has isotropism.Polycrystalline is the set of the monocrystalline of numerous orientation crystal grain, and crystal is comprised of various little crystal grain.

The application of single-crystal diamond has certain shortcoming: owing to there being cleavage surface, and easily passivation after a period of time rear edge surface wear in grinding process; Monocrystalline easily whole extracting from matrix loses ground effect, can not give full play to adamantine effectiveness, causes processing cost to raise.In order to overcome the deficiency of single-crystal diamond, people start mainly by electric plating method in diamond surface nickel plating, copper facing or titanizing etc.As Chinese patent CN85100286B, and publication application CN102286742.A, the method for diamond surface metallization is disclosed.Diamond surface, after metallization, can solve the difficulty that diamond can not bond and infiltrate with general low-melting alloy, and this is favourable to preparing the diamond tool of metallic matrix.Chinese patent 200410096957.7 also discloses a kind of composite structure of diamond surface coated with glass, diamond and titanium layers and method thereof, diamond through composite coated and metal-plated processing, volume increases, and the bond strength of diamond and matrix and hold are improved.But these method manufacturing process are complicated, production cost is high, the diamond surface of process surface metalation allows and so lacks active group, still can not form firmly chemical bonds with pottery and resin matrix, to improving life-span and the effect of diamond tool, is limited.

Synthesised polycrystalline diamond is a new technology, polycrystalline diamond abrasive particle is by the coalescent group of forming of a plurality of metastable state diamond crystallites granular solid matter, shape is not as diamond single crystal rule, be various convex-concave rough surfaces, during grinding under effect of stress, when outside micromeritics successively comes off, expose new sharp cutting edge, and grinding force is little, workpiece to be machined surface roughness is low, polycrystalline diamond abrasive particle can be brought into play abundant effectiveness, can solve the problem that single-crystal diamond integral body is extracted, come off too early from matrix.Chinese patent CN101884933B, and publication application CN102698758.A, disclose catalyst of the synthetic use of self-sharpening polycrystalline diamond and preparation method thereof.China publication application CN102941038.A discloses a kind of synthesis technique of high self-sharpening diamond.

, polycrystalline diamond product yield is low at present, quality is low, particle is little, intensity is too low, toughness is low, poor heat stability.

Summary of the invention

For the problems of the prior art, the object of the invention is to provide a kind of coarse granule polycrystalline diamond synthesis technique.

In order to achieve the above object, technical scheme of the present invention is: a kind of coarse granule polycrystalline diamond synthesis technique, comprises the following steps:

1), will synthesize the packaged press that enters;

2), in 0～60s, boost to 8MPa;

3), in 60s～120s, boost from 8MPa to 40MPa, improve heating power from 0 to 8kw simultaneously;

4), in 120s～180s, slowly boost from 40MPa to 65MPa, pressurize 60s afterwards, heating power continues to remain on 8kw, continues 240s;

5), in 240s～480s, slowly boost from 65MPa to 70MPa, pressurize 120s afterwards; Heating power slowly reduces from 8kw to 7.6kw in 360s～600s;

6), in 600s～660s, step-down is from 70MPa to 60MPa, simultaneously heating power is from 7.6kw bust to 1.5kw;

7), step-down and reduction heating power to 0, afterwards cooling 400s in 660s～720s;

8), take out synthetic piece.

Beneficial effect of the present invention is: the polycrystalline diamond out-of-shape, rough surface, the particle that are synthesized are large, and impurity is few, is bottle green, has fabulous from sharp ability and Heat stability is good.

Accompanying drawing explanation

Fig. 1 is process curve figure of the present invention.

The specific embodiment

Coarse granule polycrystalline diamond synthesis technique as shown in Figure 1, comprises the following steps:

1), will synthesize the packaged press that enters;

2), in 0～60s, boost to 8MPa;

3), in 60s～120s, boost from 8MPa to 40MPa, improve heating power from 0 to 8kw simultaneously;

4), in 120s～180s, slowly boost from 40MPa to 65MPa, pressurize 60s afterwards, heating power continues to remain on 8kw, continues 240s;

5), in 240s～480s, slowly boost from 65MPa to 70MPa, pressurize 120s afterwards; Heating power slowly reduces from 8kw to 7.6kw in 360s～600s;

6), in 600s～660s, step-down is from 70MPa to 60MPa, simultaneously heating power is from 7.6kw bust to 1.5kw;

7), step-down and reduction heating power to 0, afterwards cooling 400s in 660s～720s;

8), take out synthetic piece.

All simple distortion of making in the situation that not departing from core of the present invention or modification all fall into protection scope of the present invention.

Claims (1)

1. a coarse granule polycrystalline diamond synthesis technique, is characterized in that: comprise the following steps:

1), will synthesize the packaged press that enters;

2), in 0～60s, boost to 8MPa;

3), in 60s～120s, boost from 8MPa to 40MPa, improve heating power from 0 to 8kw simultaneously;

4), in 120s～180s, slowly boost from 40MPa to 65MPa, pressurize 60s afterwards, heating power continues to remain on 8kw, continues 240s;

5), in 240s～480s, slowly boost from 65MPa to 70MPa, pressurize 120s afterwards; Heating power slowly reduces from 8kw to 7.6kw in 360s～600s;

6), in 600s～660s, step-down is from 70MPa to 60MPa, simultaneously heating power is from 7.6kw bust to 1.5kw;

7), step-down and reduction heating power to 0, afterwards cooling 400s in 660s～720s;

8), take out synthetic piece.