CN109208443A - A kind of polycrystalline diamond composite cutter bit Synthetic block and its method for synthesizing polycrystalline diamond composite cutter bit - Google Patents
A kind of polycrystalline diamond composite cutter bit Synthetic block and its method for synthesizing polycrystalline diamond composite cutter bit Download PDFInfo
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- CN109208443A CN109208443A CN201811004619.4A CN201811004619A CN109208443A CN 109208443 A CN109208443 A CN 109208443A CN 201811004619 A CN201811004619 A CN 201811004619A CN 109208443 A CN109208443 A CN 109208443A
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- cutter bit
- polycrystalline diamond
- heat
- composite cutter
- ring
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C23/00—Auxiliary devices or arrangements for constructing, repairing, reconditioning, or taking-up road or like surfaces
- E01C23/06—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road
- E01C23/08—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road for roughening or patterning; for removing the surface down to a predetermined depth high spots or material bonded to the surface, e.g. markings; for maintaining earth roads, clay courts or like surfaces by means of surface working tools, e.g. scarifiers, levelling blades
- E01C23/085—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road for roughening or patterning; for removing the surface down to a predetermined depth high spots or material bonded to the surface, e.g. markings; for maintaining earth roads, clay courts or like surfaces by means of surface working tools, e.g. scarifiers, levelling blades using power-driven tools, e.g. vibratory tools
- E01C23/088—Rotary tools, e.g. milling drums
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
- B22F2005/001—Cutting tools, earth boring or grinding tool other than table ware
Abstract
The invention discloses a kind of polycrystalline diamond composite cutter bit Synthetic block and its methods for synthesizing polycrystalline diamond composite cutter bit, polycrystalline diamond composite cutter bit Synthetic block in the present invention, including the synthesis chamber for high temperature and pressure polycrystalline diamond composite cutter bit blank, the side wall of the synthesis chamber is successively arranged with separation layer, heating layer, insulating layer and cylindrical case from the inside to the outside, the top of the synthesis chamber is successively arranged conductive layer and conductive pressure transfer I except interior, and the bottom of the synthesis chamber is equipped with conductive pressure transfer II；The synthesis is intracavitary to be equipped with composite polycrystal-diamond blank and isolating cap, the heating layer is made of heat-generating pipe I, connection washer and heat-generating pipe II, the outer diameter of the heat-generating pipe II is greater than heat-generating pipe I, and the outer diameter of the heat-generating pipe II is identical as connection washer, and the cylindrical case is pyrophyllite block.
Description
Technical field
The invention belongs to superhard material manufacturing technology fields, and in particular to a kind of polycrystalline diamond composite cutter bit Synthetic block and
It synthesizes the method for polycrystalline diamond composite cutter bit.
Background technique
Polycrystalline diamond composite cutter bit is to be combined to diamond using high-temperature and high-pressure technique on diamond synthesis press
On sintered carbide ball tooth surface, it is formed on the good thin layer of diamond of wearability, while utilizing the good punching of hard alloy
Toughness is hit, good impact flexibility is made it have.Its cutting tooth as highway milling machine (development machine) participates in bituminous concrete
Road surface cutting plays a crucial role among Asphalt Concrete Pavement of Freeway milling and municipal maintenance work.
Currently, conventional synthesis block package assembly, since its major diameter is bigger, makes when synthesizing polycrystalline diamond composite cutter bit
Easily there is the not high problem of quality shakiness and performance in the polycrystalline diamond composite cutter bit of synthesis.Therefore, conventional synthesis block assembling knot
Structure is not able to satisfy the biggish polycrystalline diamond composite cutter bit synthesis needs of draw ratio.
Summary of the invention
The purpose of the present invention is to provide a kind of polycrystalline diamond composite cutter bit Synthetic block and its synthesis polycrystalline diamond are multiple
The method for closing pick.
Based on above-mentioned purpose, the present invention is adopted the following technical scheme that: a kind of polycrystalline diamond composite cutter bit Synthetic block, including
For the synthesis chamber of high temperature and pressure polycrystalline diamond composite cutter bit blank, the side wall of the synthesis chamber successively covers from the inside to the outside
Equipped with separation layer, heating layer, insulating layer and cylindrical case, the top of the synthesis chamber is successively arranged conductive layer except interior and leads
Fax pressurized layer I, the bottom of the synthesis chamber are equipped with conductive pressure transfer II；The synthesis is intracavitary to be equipped with polycrystalline diamond composite cutter bit
Blank and isolating cap, the isolation cap are located at the top of polycrystalline diamond composite cutter bit blank, and the heating layer is by heat-generating pipe
I, washer and heat-generating pipe II composition are connected, the outer diameter of the heat-generating pipe II is greater than heat-generating pipe I, the outer diameter of the heat-generating pipe II and company
Connection pad circle it is identical, the cylindrical case be pyrophyllite block.
Further, the conductive layer is by trapezoidal conductive column, insulating ring and conductive sheet set at, the thickness of insulating ring and trapezoidal
The height of conductive column is identical and insulating ring and trapezoidal conductive column are adapted, and insulating ring is sleeved on outside trapezoidal conductive column, is sleeved on one
Be respectively equipped with conductive sheet and lower conductive sheet at the top and bottom of the insulating ring and trapezoidal conductive column risen, the trapezoidal conductive column by
Graphite or molybdenum are made, and the insulating ring is made of dolomite, and the conductive sheet is made of graphite plate or molybdenum plate.
Further, the conduction pressure transfer I is made of pyrophillite ring I, conducting steel ring I and dolomite core I；The conduction
Steel ring I is set in outside dolomite core I, and the pyrophillite ring I is set in outside conducting steel ring I, and the outer diameter of the conducting steel ring I is equal to
The outer diameter of insulating ring, the outer diameter of the pyrophillite ring I is equal to the outer diameter of insulating layer, and (i.e. pyrophillite ring I lid is located at the top of insulating layer
Portion).
Further, the conduction pressure transfer II is made of pyrophillite ring II, conducting steel ring II and dolomite core II；It is described
Conducting steel ring II is set in outside dolomite core II, and the pyrophillite ring II is set in outside conducting steel ring II, the dolomite core II
Outer diameter be equal to the outer diameter (i.e. dolomite core II pad in the bottom of separation layer) of separation layer, the outer diameter of the conducting steel ring II is equal to
The outer diameter of heat-generating pipe II, the outer diameter of the pyrophillite ring II is equal to the outer diameter of insulating layer, and (pyrophillite ring II pad is at the bottom of insulating layer
Portion).
Further, the heat-generating pipe I and heat-generating pipe II are made of graphite, Aludirome, titanium or molybdenum, the connection gasket
Circle is made of titanium, molybdenum, zirconium or tantalum, and the separation layer and isolating cap are made of analysis pure sodium chloride, and the insulating layer is by dolomite
It is made.
Further, the separation layer is in two layers of ladder-type structure, and two layers of ladder-type structure is respectively upper ladder-type structure
With downstairs shape structure, heat-generating pipe I is located at the lateral surface of upper ladder-type structure, and connection washer is located at the shoulder of two layers of ladder-type structure
Portion, heat-generating pipe II are located at the lateral surface of downstairs shape structure.Conducting steel ring uses wall thickness for 1mm, stainless steel or low in the present invention
The thin-walled plug of carbon steel.
The method for synthesizing poly- diamond composite cutter bit using above-mentioned polycrystalline diamond composite cutter bit Synthetic block, including following step
It is rapid:
1) pyrophyllite block and pyrophillite ring are placed in vacuum sintering furnace, are evacuated in furnace air pressure up to 3 × 10-2Pa with
Under, it is heated to 350~400 DEG C and in 350~400 DEG C of heat preservation 20~25 h, it is spare；
2) polycrystalline diamond composite cutter bit blank is placed in vacuum sintering furnace, is evacuated in furnace air pressure up to 6 × 10-2Pa
Hereinafter, being heated to 150~200 DEG C and in 150~200 DEG C of 0.5~1h of heat preservation, then proceed to vacuumize while being heated to 850~
950 DEG C, until furnace internal pressure is stablized 3 × 10-3Pa is hereinafter, stop vacuumizing, under the conditions of 850~950 DEG C into vacuum furnace
Be filled in mixed gas to furnace air pressure be 100~150Mbar to 4~6h of composite sheet blank reduction treatment after, then be evacuated to furnace
Interior air pressure 3 × 10-3Pa or less；Wherein:
The mixed gas is carbon dioxide and hydrogen；
The percent by volume of the carbon dioxide and hydrogen is respectively 40~45% and 55~60%；
3) by step 1), 2) gained pyrophyllite sky block, pyrophillite ring and polycrystalline diamond composite cutter bit blank and poly- diamond are multiple
The other component for closing pick Synthetic block fits together, to form Synthetic block；
4) Synthetic block obtained by step 3) is placed in cubic hinge press, for pyrophyllite block and conductive pressure transfer pressure, works as pressure
When rising to 4~5GPa, conducting steel ring I is passed through 900~1600A electric current, electric current successively via upper conductive sheet, trapezoidal conductive column,
Lower conductive sheet, heat-generating pipe I, connection washer and heat-generating pipe II, then flowed out by underlying conducting steel ring II, it is logical to form electric current
Road, thus the heat-generating pipe polycrystalline diamond composite cutter bit blank intracavitary to the synthesis is sintered, and finally obtains plycrystalline diamond Buddha's warrior attendant
Stone composite cutter bit product.
Further, in the step 4), 6 ~ 7GPa is boosted to after being passed through electric current, heating temperature rises to 1400~1500 DEG C
When keep 5~15min cavity temperature is down to 950~1000 DEG C with the rate of temperature fall of 120~160 DEG C/min, then later
Turn-off current stops heating, while chamber pressure is slowly dropped to normal pressure with the rate of 1.0~1.1GPa/min by pressure, completes poly-
The sintering of diamond composite cutter bit.
The polycrystalline diamond composite cutter bit that above-mentioned synthetic method obtains.
The beneficial effect comprise that:
1. the present invention is bad as separation layer and isolation cap material package closing composite polycrystal-diamond using analysis pure sodium chloride
Expect synthesis unit, since sodium chloride can be in molten state under synthesis temperature, plays the pressure transmission effect for waiting static pressure, while chlorination sodium fusion
Melting rear volume can expand, and can offset volume compression caused by the pyrophillite high-temperature phase-change of part, tend to synthetic cavity Pressure Field
Stable state.
2. for conventional synthesis block package assembly when synthesizing polycrystalline diamond composite cutter bit, since its major diameter is bigger,
It is limited by synthetic cavity structure, occurring the polycrystalline diamond composite cutter bit of synthesis easily, quality shakiness and performance be not high to ask
Topic is heated using Synthetic block using the heating tube of two different diameter specifications, and the different of pipe diameter of generating heat are synthesizing in turn
Intracavitary upper and lower cavity formation temperature is poor, and the polycrystalline diamond layer temperature for synthesizing intracavitary blank is made to be higher than the temperature of carbide matrix body end
Degree preferably solves quality occur not when the biggish polycrystalline diamond composite cutter bit of existing Synthetic block package assembly synthesis draw ratio
Steady and not high performance problem.
3. pyrophillite as high pressure transmission medium by top hammer surface high pressure be transmitted to synthesis it is intracavitary, while also rise heat preservation insulation
Effect, pyrophyllite in lumps of the present invention, pyrophyllite ring meet by vacuum baking and the reasonable selection of technique and synthesize high grade plycrystalline diamond gold
The requirement of hard rock composite cutter bit.
4. in the synthesis of polycrystalline diamond composite cutter bit high pressure high temperature, the purity and diamond raw material of metallic bond
Particle surface state will directly affect compound piece performance, the present invention is using polycrystalline diamond composite cutter bit blank sample through dioxy
Change carbon and hydrogen mixing reducing gas carries out vacuum sintering technology method, obtains metallic bond, diamond surface adsorbing contaminant
To removing, with high-purity, increase its respond combined outward.
5. conducting steel ring uses wall thickness for the thin of 1mm, stainless steel or mild steel in the present invention in conductive pressure transfer design
Wall plug, centre filling dolomite and the cured stone ring of peripheral mantle lobe, to guarantee that reactant uniform-compression does not deform in synthesis chamber,
And reduce the heat transmitting in both ends knocker direction using its thin-wall construction, it is hammered into shape to realize that both ends keep the temperature and avoid burning.
6. trapezoidal conductive column is equipped in insulating ring trapezoidal hole in conductive layer design in the present invention, the trapezoidal conductive column
Main function is conduction, and trapezoidal conductive column is distributed due to being easy with good thermal conductivity intracavitary heat is synthesized, and is
It effectively prevents synthesizing intracavitary heat loss, there are the graphite of certain resistance or molybdenum material system using itself for trapezoidal conductive column
At, make its conduction while can also generate heat, with rise thermal insulation function insulating ring together with hinder synthesis chamber heat dissipate
It loses.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of Synthetic block in the present invention.
In figure, 1. pyrophyllite blocks, 2. pyrophillite ring I, 3. conducting steel ring I, 4. dolomite core I, conductive sheet on 51.
52. lower conductive sheet, 6. trapezoidal conductive columns, 7. insulating rings, 8. heat-generating pipe I, 9. connection washers, 10. heat-generating pipe II, 11.
Separation layer, 12. dolomite core II, 13. conducting steel ring II, 14. pyrophillite ring II, 15. insulating layers, 16. polycrystalline diamonds
Composite cutter bit blank, 17. isolating caps.
Specific embodiment
In order to keep technical purpose of the invention, technical scheme and beneficial effects clearer, with reference to the accompanying drawing and specifically
Embodiment is further illustrated technical solution of the present invention.
Embodiment 1
As shown in Figure 1, a kind of plycrystalline diamond hard rock composite cutter bit Synthetic block, including it is used for compound section of high temperature and pressure polycrystalline diamond
The side wall of the synthesis chamber of gear blank material 16, the synthesis chamber is successively arranged with separation layer 11, heating layer, 15 and of insulating layer from the inside to the outside
Cylindrical case, the top of the synthesis chamber are successively arranged conductive layer and conductive pressure transfer I, the bottom of the synthesis chamber except interior
Equipped with conductive pressure transfer II；The synthesis is intracavitary to be equipped with polycrystalline diamond composite cutter bit blank 16 and isolating cap 17, the isolation
Cap is located at the top of polycrystalline diamond composite cutter bit blank, and the heating layer is by heat-generating pipe I 8, connection washer 9 and heat-generating pipe
II 10 is formed, and the outer diameter of the heat-generating pipe II 10 is greater than heat-generating pipe I 8, the outer diameter of the heat-generating pipe II 10 with connect washer 9
It is identical, the cylindrical case be pyrophyllite block 1.
Further, the conductive layer by trapezoidal conductive column 6, insulating ring 7 and conductive sheet set at, the thickness of insulating ring 7 and
The height of trapezoidal conductive column 6 is identical and insulating ring 7 and trapezoidal conductive column 6 are adapted, and insulating ring 7 is sleeved on outside trapezoidal conductive column 6,
The top and bottom of the insulating ring 7 and trapezoidal conductive column 6 that are set in together are respectively equipped with conductive sheet 51 and lower conductive sheet 52, institute
It states trapezoidal conductive column 6 to be made of graphite or molybdenum, the insulating ring 7 is made of dolomite, the upper conductive sheet 51 and lower conductive sheet
52 are made of graphite plate or molybdenum plate.
Further, the conduction pressure transfer I is made of pyrophillite ring I 2, conducting steel ring I 3 and dolomite core I 4；Institute
It states conducting steel ring I 3 to be set in outside dolomite core I 4, the pyrophillite ring I 2 is set in outside conducting steel ring I3, the conductive steel
The outer diameter for enclosing I3 is equal to the outer diameter of insulating ring 7, and the outer diameter of the pyrophillite ring I 2 is equal to outer diameter (the i.e. pyrophillite of insulating layer 15
Ring I 2 covers the top for being located at insulating layer 15).
Further, the conduction pressure transfer II is by pyrophillite ring II 14, conducting steel ring II13 and dolomite core II12 group
At；The conducting steel ring II13 is set in outside dolomite core II12, and the pyrophillite ring II14 is set in outside conducting steel ring II13,
The outer diameter of the dolomite core II12 is equal to the outer diameter (i.e. dolomite core II12 is padded in the bottom of separation layer 11) of separation layer 11, institute
The outer diameter for stating conducting steel ring II13 is equal to the outer diameter of heat-generating pipe II10, and the outer diameter of the pyrophillite ring II14 is equal to insulating layer 15
Outer diameter (pyrophillite ring II 14 is padded in the bottom of insulating layer 15).
Further, the heat-generating pipe I8 and heat-generating pipe II10 are made of graphite, Aludirome, titanium or molybdenum, the company
Connection pad circle 9 is made of titanium, molybdenum, zirconium or tantalum, and the separation layer 11 and isolating cap 17 are made of sodium chloride, and the insulating layer 15 is by white
Marble is made.
Further, the separation layer 11 is in two layers of ladder-type structure, and two layers of ladder-type structure is respectively upper stairstepping knot
Structure and downstairs shape structure, heat-generating pipe I 8 are located at the lateral surface of upper ladder-type structure, and connection washer 9 is located at two layers of stairstepping knot
The shoulder of structure, heat-generating pipe II 10 are located at the lateral surface of downstairs shape structure.
Embodiment 2
A method of polycrystalline diamond composite cutter bit is synthesized using Synthetic block described in embodiment 1, comprising the following steps:
1) pyrophyllite block 1, pyrophillite ring I2 and pyrophillite ring II14 are placed in vacuum sintering furnace, are evacuated to gas in furnace
It presses up to 3 × 10-3Pa is spare hereinafter, be heated to 380 DEG C of heat preservation 20h；
2) the polycrystalline diamond composite cutter bit blank 16 is placed in vacuum sintering furnace, be slightly evacuated in furnace air pressure up to 6 ×
10-2Pa then proceedes to vacuumize while being heated to 900 DEG C hereinafter, be heated to 180 DEG C of heat preservation 1h, until furnace internal pressure stablize 3 ×
10-3Then Pa is hereinafter, stop vacuumizing that be filled in furnace air pressure into vacuum furnace under the conditions of 900 DEG C be that 150Mbar is mixed
Gas is to composite sheet blank reduction treatment 5h, then is evacuated to air pressure 3 × 10 in furnace-3Pa or less；Wherein:
The mixed gas is carbon dioxide and hydrogen；
The percent by volume of the carbon dioxide and hydrogen is respectively 45% and 55%；
3) by step 1), 2) gained pyrophyllite in lumps 1, pyrophillite ring I2, pyrophillite ring II14, heat-generating pipe I8, heat-generating pipe II10, poly-
The other component of diamond composite cutter bit blank 16 and polycrystalline diamond composite cutter bit fits together, to form synthesis
Block；
4) Synthetic block obtained by step 3) is placed in cubic hinge press, for pyrophyllite block 1 and conductive pressure transfer pressure, works as pressure
1200A electric current is passed through to the conducting steel ring I being located above when power rises to 4.5GPa, electric current is successively via upper conductive sheet 51, trapezoidal
Conductive column 6, lower conductive sheet 52, heat-generating pipe I8, connection washer 9 and heat-generating pipe II10, then by underlying conducting steel ring II13
Outflow forms current path, and thus the heat-generating pipe polycrystalline diamond composite cutter bit blank 16 intracavitary to the synthesis is sintered,
6.5GPa is boosted to, 1500 DEG C of holding 10min is warming up to and is later down to cavity temperature with the rate of temperature fall of 140 DEG C/min
It 1000 DEG C, is then turned off electric current and stops heating, while chamber pressure is slowly dropped to normal pressure with the rate of 1.0GPa/min by pressure,
The polycrystalline diamond composite cutter bit is set to complete to be sintered at high temperature under high pressure.
Embodiment 3
A method of polycrystalline diamond composite cutter bit is synthesized using Synthetic block described in embodiment 1, comprising the following steps:
1) pyrophyllite block 1, pyrophillite ring I2 and pyrophillite ring II14 are placed in vacuum sintering furnace, are evacuated to gas in furnace
It presses up to 3 × 10-3Pa is spare hereinafter, be heated to 350 DEG C of heat preservation 25 h；
2) the polycrystalline diamond composite cutter bit blank 16 is placed in vacuum sintering furnace, be slightly evacuated in furnace air pressure up to 6 ×
10-2Pa then proceedes to vacuumize while being heated to 950 DEG C hereinafter, be heated to 150 DEG C of heat preservation 1h, until furnace internal pressure stablize 3 ×
10-3Then Pa is hereinafter, stop vacuumizing that be filled in furnace air pressure into vacuum furnace under the conditions of 950 DEG C be that 100Mbar is mixed
Gas is to composite sheet blank reduction treatment 6h, then is evacuated to air pressure 3 × 10 in furnace-3Pa or less；Wherein:
The mixed gas is carbon dioxide and hydrogen；
The percent by volume of the carbon dioxide and hydrogen is respectively 42% and 58%；
3) by step 1), 2) gained pyrophyllite in lumps 1, pyrophillite ring I2, pyrophillite ring II14, heat-generating pipe I8, heat-generating pipe II10, poly-
The other component of diamond composite cutter bit blank 16 and polycrystalline diamond composite cutter bit fits together, to form synthesis
Block.
4) Synthetic block obtained by step 3) is placed in cubic hinge press, is pressed for pyrophyllite block 1 and conductive pressure transfer,
1600A electric current is passed through to the conducting steel ring I being located above when pressure rises to 4GPa, electric current is successively via lower conductive sheet 51, ladder
Shape conductive column 6, lower conductive sheet 52, heat-generating pipe I8, connection washer 9 and heat-generating pipe II10, then by underlying conducting steel ring
II13 outflow, forms current path, and thus the heat-generating pipe polycrystalline diamond composite cutter bit blank 16 intracavitary to the synthesis carries out
Heating, is boosted to 6GPa, is warming up to 1400 DEG C of holding 15min and is later dropped cavity temperature with the rate of temperature fall of 160 DEG C/min
To 950 DEG C, it is then turned off electric current and stops heating, while chamber pressure is slowly dropped to often by pressure with the rate of 1.0GPa/min
Pressure, makes the polycrystalline diamond composite cutter bit complete to be sintered at high temperature under high pressure.
Embodiment 4
A method of polycrystalline diamond composite cutter bit is synthesized using Synthetic block described in embodiment 1, comprising the following steps:
1) pyrophyllite block 1, pyrophillite ring I2 and pyrophillite ring II14 are placed in vacuum sintering furnace, are evacuated to gas in furnace
It presses up to 3 × 10-3Pa is spare hereinafter, be heated to 400 DEG C of heat preservation 25 h.
2) the polycrystalline diamond composite cutter bit blank 16 is placed in vacuum sintering furnace, is slightly evacuated to air pressure in furnace and reaches
6×10-2Pa then proceedes to vacuumize while being heated to 850 DEG C hereinafter, be heated to 200 DEG C of heat preservation 0.5h, exists until furnace internal pressure is stablized
3×10-3Then Pa is hereinafter, stop vacuumizing that be filled in furnace air pressure into vacuum furnace under the conditions of 850 DEG C mixed for 120Mbar
Gas is closed to composite sheet blank reduction treatment 4h, then is evacuated to air pressure 3 × 10 in furnace-3Pa or less；Wherein:
The mixed gas is carbon dioxide and hydrogen；
The percent by volume of the carbon dioxide and hydrogen is respectively 40% and 60%；
3) by step 1), 2) gained pyrophyllite in lumps 1, pyrophillite ring I2, pyrophillite ring II14, heat-generating pipe I8, heat-generating pipe II10, poly-
The other component of diamond composite cutter bit blank 16 and polycrystalline diamond composite cutter bit fits together, to form synthesis
Block.
4) Synthetic block obtained by step 3) is placed in cubic hinge press, is pressed for pyrophyllite block 1 and conductive pressure transfer,
900A electric current is passed through to the conducting steel ring I being located above when pressure rises to 5GPa, electric current is successively via lower conductive sheet 51, trapezoidal
Conductive column 6, lower conductive sheet 52, heat-generating pipe I8, connection washer 9 and heat-generating pipe II10, then by underlying conducting steel ring II13
Outflow forms current path, and thus the heat-generating pipe polycrystalline diamond composite cutter bit blank 16 intracavitary to the synthesis heats,
7GPa is boosted to, 1400 DEG C of holding 5min is warming up to and cavity temperature is down to 980 with the rate of temperature fall of 120 DEG C/min later
DEG C, it is then turned off electric current and stops heating, while chamber pressure is slowly dropped to normal pressure with the rate of 1.1GPa/min by pressure, makes institute
The polycrystalline diamond composite cutter bit stated is completed to be sintered at high temperature under high pressure.
Comparative test
Comparative example 1
Comparative example 1 uses preparation method same as Example 2, and difference place is to synthesize block structure difference, and difference is only
Are as follows: the Synthetic block of comparative example 1 removes lower conductive sheet 52, trapezoidal conductive column 6 and insulating ring 7 in embodiment 1, and accordingly changes phase
The axial length of component is closed, so that Synthetic block keeps the tight structure of layer stackup dress.
Comparative example 2
Comparative example 2 uses preparation method same as Example 2, and difference place is to synthesize block structure difference, and difference is only
Are as follows: in the Synthetic block of comparative example 2, heat-generating pipe I8, connection washer 9 are identical with heat-generating pipe II10 diameter specifications, and accordingly change phase
The radial dimension of component separation layer 11 and conducting steel ring II13 is closed, so that Synthetic block keeps the tight structure of radial closed assembly.
Comparative example 3
Comparative example 3 uses preparation method same as Example 2, and difference place is to synthesize block structure difference, and difference is only
Are as follows: in the Synthetic block of comparative example 3, separation layer 11 and isolating cap 17 are all made of dolomite.
Comparative example 4
Comparative example 4 uses synthesis block structure same as Example 2, and difference place is preparation method difference, and difference is only
Are as follows: in comparative example 4, pyrophyllite block 1, pyrophillite ring I2 and pyrophillite ring II14 are changed under non-vacuum roasting (i.e. room temperature are normal
Pressure roasting).
Comparative example 5
Comparative example 5 uses synthesis block structure same as Example 2, and difference place is preparation method difference, and difference is only
Are as follows: in comparative example 5, apply the pressure of 6.5GPa, pressurizeing while being passed through electric current, is kept when temperature is to 1500 DEG C
20min, later, turn-off current stop heating, while chamber pressure is slowly dropped to often by pressure with the rate of 1.2GPa/min
Pressure completes sintering.
By embodiment 2 and the preparation-obtained polycrystalline diamond composite cutter bit of comparative example 1 to 5 under same test condition into
Row wearability, impact resistance, heat stability testing, wearability, impact resistance, the measuring method of heat stability testing are all made of this
Field routine test means carry out wearability using JB/T3235-2013 " diamond sintered body Measurement of abrasion ratio method "
Test, carrying out toughness test using the method for drop impact, (that is: the block stamp of 4kg is freely fallen in 100cm height, benefit
Tested with the energy impact sample, when there is microfissure with specimen surface, obtain impact resistance value), statistical result is such as
Following table:
By upper table statistical result it can be seen that compared with comparative example 1 to 5, the preparation-obtained polycrystalline diamond of embodiment 2 to 4
The wear resistance ratio of composite cutter bit improves 29% ~ 67%, and impact resistance improves 30 ~ 100%, after roasting 2 hours under the conditions of 750 DEG C
Its wear resistance ratio and toughness numerical value change are minimum, illustrate there is preferable abrasion resistance, heat resistance and impact resistance.
It should be noted last that: technical solution of the present invention that the above embodiments are only illustrative and not limiting is any right
The equivalent replacement and do not depart from the modification of spirit and scope of the invention or locally replace that the present invention carries out, should all cover in this hair
Within bright protective scope of the claims.
Claims (9)
1. a kind of polycrystalline diamond composite cutter bit Synthetic block, including it is used for high temperature and pressure polycrystalline diamond composite cutter bit blank
Synthesis chamber, it is described synthesis chamber side wall be successively arranged with separation layer, heating layer, insulating layer and cylindrical case, institute from the inside to the outside
The top for stating synthesis chamber is successively arranged conductive layer and conductive pressure transfer I except interior, and the bottom of the synthesis chamber is equipped with conductive pass
Pressurized layer II；The synthesis is intracavitary to be equipped with polycrystalline diamond composite cutter bit blank and isolating cap, and the isolation cap is located at plycrystalline diamond gold
The top of hard rock composite cutter bit blank, it is characterised in that: the heating layer is made of heat-generating pipe I, connection washer and heat-generating pipe II,
The outer diameter of the heat-generating pipe II is greater than heat-generating pipe I, the outer diameter of the heat-generating pipe II and identical, the cylindrical case for connecting washer
For pyrophyllite block.
2. polycrystalline diamond composite cutter bit Synthetic block according to claim 1, it is characterised in that: the conductive layer is led by trapezoidal
Electric column, insulating ring and conductive sheet set be identical with the height of trapezoidal conductive column at, the thickness of insulating ring and insulating ring and trapezoidal conduction
Column is adapted, and insulating ring is sleeved on outside trapezoidal conductive column, the top and bottom of the insulating ring and trapezoidal conductive column that are set in together
It is respectively equipped with conductive sheet and lower conductive sheet, the trapezoidal conductive column is made of graphite or molybdenum, and the insulating ring is made of stones by white clouds
At the conductive sheet is made of graphite plate or molybdenum plate.
3. polycrystalline diamond composite cutter bit Synthetic block according to claim 2, it is characterised in that: the conduction pressure transfer I by
Pyrophillite ring I, conducting steel ring I and dolomite core I composition；The conducting steel ring I is set in outside dolomite core I, the pyrophillite
Ring I is set in outside conducting steel ring I, and the outer diameter of the conducting steel ring I is equal to the outer diameter of insulating ring, the outer diameter of the pyrophillite ring I
Equal to the outer diameter of insulating layer.
4. polycrystalline diamond composite cutter bit Synthetic block according to claim 1, it is characterised in that: the conduction pressure transfer II by
Pyrophillite ring II, conducting steel ring II and dolomite core II composition；The conducting steel ring II is set in outside dolomite core II, the leaf
Cured stone ring II is set in outside conducting steel ring II, and the outer diameter of the dolomite core II is equal to the outer diameter of separation layer, the conducting steel ring
The outer diameter of II is equal to the outer diameter of heat-generating pipe II, and the outer diameter of the pyrophillite ring II is equal to the outer diameter of insulating layer.
5. polycrystalline diamond composite cutter bit Synthetic block according to claim 1, it is characterised in that: the heat-generating pipe I and fever
Pipe II is made of graphite, Aludirome, titanium or molybdenum, and the connection washer is made of titanium, molybdenum, zirconium or tantalum, the separation layer and
Isolating cap is made of sodium chloride, and the insulating layer is made of dolomite.
6. polycrystalline diamond composite cutter bit Synthetic block according to claim 1, it is characterised in that: the separation layer is in two layers of rank
Trapezium structure, two layers of ladder-type structure are respectively that upper ladder-type structure and downstairs shape structure, heat-generating pipe I are located at upper stairstepping knot
The lateral surface of structure, connection washer are located at the shoulder of two layers of ladder-type structure, and heat-generating pipe II is located at the lateral surface of downstairs shape structure.
7. synthesizing compound section of polycrystalline diamond using any polycrystalline diamond composite cutter bit Synthetic block of claim 1 to 6
The method of tooth, which comprises the following steps:
1) pyrophyllite block and pyrophillite ring are placed in vacuum sintering furnace, are evacuated in furnace air pressure up to 3 × 10-2Pa with
Under, it is heated to 350~400 DEG C and in 350~400 DEG C of heat preservation 20~25 h, it is spare；
2) polycrystalline diamond composite cutter bit blank is placed in vacuum sintering furnace, is evacuated in furnace air pressure up to 6 × 10-2Pa with
Under, it is heated to 150~200 DEG C and in 150~200 DEG C of 0.5~1h of heat preservation, then proceedes to vacuumize while being heated to 850~950
DEG C, until furnace internal pressure is stablized 3 × 10-3Pa hereinafter, stop vacuumize, be filled under the conditions of 850~950 DEG C into vacuum furnace
In mixed gas to furnace air pressure be 100~150Mbar to 4~6h of composite sheet blank reduction treatment after, then be evacuated to gas in furnace
Pressure 3 × 10-3Pa or less；Wherein:
The mixed gas is carbon dioxide and hydrogen；
The percent by volume of the carbon dioxide and hydrogen is respectively 40~45% and 55~60%；
3) by step 1), 2) gained pyrophyllite sky block, pyrophillite ring and polycrystalline diamond composite cutter bit blank and poly- diamond are multiple
The other component for closing pick Synthetic block fits together, to form Synthetic block；
4) Synthetic block obtained by step 3) is placed in cubic hinge press, for pyrophyllite block and conductive pressure transfer pressure, works as pressure
When rising to 4~5GPa, conducting steel ring I is passed through 900~1600A electric current, electric current successively via upper conductive sheet, trapezoidal conductive column,
Lower conductive sheet, heat-generating pipe I, connection washer and heat-generating pipe II, then flowed out by underlying conducting steel ring II, it is logical to form electric current
Road, thus the heat-generating pipe polycrystalline diamond composite cutter bit blank intracavitary to the synthesis is sintered, and finally obtains plycrystalline diamond Buddha's warrior attendant
Stone composite cutter bit product.
8. synthesizing the method for polycrystalline diamond composite cutter bit according to claim 7, which is characterized in that in the step 4),
6 ~ 7GPa is boosted to after being passed through electric current, heating temperature keeps 5~15min when rising to 1400~1500 DEG C, later, with 120~160
DEG C/cavity temperature is down to 950~1000 DEG C by the rate of temperature fall of min, it is then turned off electric current and stops heating, while pressure is with 1.0
Chamber pressure is slowly dropped to normal pressure by the rate of~1.1GPa/min, completes the sintering of polycrystalline diamond composite cutter bit.
9. the polycrystalline diamond composite cutter bit that synthetic method as claimed in claim 7 obtains.
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