CN103722174B - A kind of self-sharpening composite polycrystal-diamond and preparation method thereof - Google Patents
A kind of self-sharpening composite polycrystal-diamond and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a kind of self-sharpening composite polycrystal-diamond and preparation method thereof, self-sharpening composite polycrystal-diamond comprises hard alloy substrate and polycrystalline diamond glomerocryst layer, described polycrystalline diamond glomerocryst layer comprises the diadust of 60% ~ 95% and the bonding agent of 5% ~ 40%, described bonding agent is metal and Ceramic Composite bonding agent, wherein metal accounts for 1% ~ 11% of polycrystalline diamond glomerocryst layer, pottery accounts for 1% ~ 40% of polycrystalline diamond glomerocryst layer, diadust and bonding agent respectively through chemical acid alkali process, physical vacuum process, ball milling mixes, compressing, self-sharpening is made good finally by HTHP sintering, the uniform diamond compact of wear resistance ratio, be suitable for the high-speed cutting processing of non-black metal and Precision Machining and geological prospecting.
Description
Technical field
The present invention relates to the preparing technical field of cutting and Milling Process use super-hard compound material cutter, be specifically related to a kind of self-sharpening composite polycrystal-diamond and preparation method thereof.
Background technology
For row, it is apt to work, must first sharpen his tools.In metal cutting technology, the material of improvement of cutter has more potentiality for the change improving stock-removing efficiency, cost process more any than other is cut in reduction, therefore in order to constantly upgrade the efficiency, reduce product cost, make its goods more competitive, each industrially developed country is all in the research and development carrying out cutter new material energetically.Under the promotion of this understanding, cutter material new abroad, efficient cutter new product and cutter manufacture new technology continue to bring out.The kind of current superhard cutter constantly increases, and not only has lathe tool, boring cutter, reamer, milling cutter, molding cutter, and also have the cutter for the manufacture of some gears, meanwhile output is also in continuous increase.Such as adopt polycrystalline diamond (Polycrystalline Diamond the is called for short PCD) high-speed milling cutter (six swords, diameter ￠ 100mm) of aluminum substrate cutterhead, maximum speed can reach more than 20000r/min, and cutting speed can reach 7000m/min.Be suitable for the forming face processing of auto parts and components.Day by day universal along with Digit Control Machine Tool, machining center and automatic assembly line, the use of various PCD blade gets more and more, and its tool life comparatively hard alloy cutter can improve tens times.Can manufacture high-end polycrystalline diamond (containing assorted polycrystalline diamond) cutter material is at present all imported product, the following aspects of having traced it to its cause: 1. diamond raw material.Carbonado(card Beneteau occurring in nature exists) and Ballas(Ba Kasi) two kinds of glomerocryst (polycrystalline) diamonds not only have high, the wear-resisting feature of natural diamond hardness, but also have the advantage without cleavage surface, good impact resistance.Be abroad the PCD developed on the basis of the natural polycrystalline diamond of research, have harsh requirement to diamond raw material.2. bonding agent.The bonding agent of current domestic manufacture polycrystalline diamond mainly contains two large classes: a class is Co based anchoring agent, and bond strength is high, and shock resistance is good; Another kind of is Si based anchoring agent, and bond strength is general, and anti-wear performance is high.3. material property.The wear resistance ratio of external polycrystalline diamond is generally between 150,000-25 ten thousand, and inside differs less than 80,000 with edge; The wear resistance ratio of domestic polycrystalline diamond is generally between 300,000-100 ten thousand, and inside differs very big with edge.Adamantine granularity home products used also thick several particle size fraction.4. processing characteristics.Very large gap is had on service life with in processing roughness with external product.The self-sharpening of external product is good, and diamond and bonding agent reach synchronous effect of wearing and tearing substantially, long service life, and self-sharpening determines external instrument to add man-hour stressed less, is conducive to cutting and creeping into, generates heat little, the finished surface of not burning part; Due to fine size, the fineness of finished surface reaches the degree of minute surface; Home products easily produces oarse-grained diamond drop-off, even tipping.Not only destroy workpiece to be machined, even occur the injury accident to equipment damage or operator, must process be stopped, the blade more renewed, cause production cost obviously to increase.
In order to overcome above-mentioned deficiency, people start the toughness improving polycrystal diamond cutter material.Chinese patent 201110148812 discloses the preparation method that a kind of CNT strengthens diamond compact material, significantly improves toughness and the stability of PDC material.Chinese patent 201010616949 also discloses a kind of preparation method of diamond compact, and adopting the method can solve prior art, to obtain product sintering structure compact and uniform structure poor, the problem that residual stress is large.Chinese patent 200920223402 discloses a kind of preparation method of wedge diamond hard alloy composite slice, diamond layer is that wedge shape is embedded on hard alloy substrate layer, other positions of Thickness Ratio of such diamond layer edge and effective operating position are thick, thus can increase wear resistance.In addition, the faying face of diamond layer and hard alloy substrate layer has plane and wedge shape boss to select, and wherein wedge shape boss better can improve impact strength.More than just from the toughness of material, part solves the combined strength bination problem of oarse-grained diamond drop-off problem and diamond and carbide alloy, does not improve from cutting abrasion mechanism, especially " self-sharpening " of material in working angles.Polycrystalline diamond is mainly used in making geological drilling, machinery knives material.Polycrystalline diamond blank mainly contains two kinds, and one is integral pure polycrystalline diamond sintered sheets; The second is glomerocryst layer with polycrystalline diamond, take carbide alloy as the composite sheet that matrix sinters jointly through HTHP.Due to carbide alloy good toughness, usually adopt carbide alloy as matrix, prepare composite sheet with polycrystalline diamond.Common diamond compact, greatly, thermal coefficient of expansion is different, and composite sheet easily ftractures, delamination, is greatly limited during use for hard alloy substrate and glomerocryst layer chemical component difference.
Summary of the invention
Technical problem to be solved by this invention easily ftractures when being and using for common diamond compact, the problem of delamination and provide a kind of self-sharpening good, uniform diamond compact of wear resistance ratio and preparation method thereof.
For solving the problems of the technologies described above, the present invention by the following technical solutions:
Self-sharpening composite polycrystal-diamond of the present invention, comprise hard alloy substrate and polycrystalline diamond glomerocryst layer, described polycrystalline diamond glomerocryst layer comprises the diadust of 60% ~ 95% and the bonding agent of 5% ~ 40%, described bonding agent is metal and Ceramic Composite bonding agent, wherein metal accounts for 1% ~ 11% of polycrystalline diamond glomerocryst layer, and pottery accounts for 1% ~ 40% of polycrystalline diamond glomerocryst layer.
The particle diameter of described diadust is the powder of 0.5 ~ 30 μm.
The particle diameter of described diadust is 3.5 μm, 10 μm or 25 μm.
Described hard alloy substrate is the matrix that W-Co kind carbide alloy is made, and comprises cylinder, triangle body, hexagon body, rhombogen or positive tetragonal body.
Described metal is metallic cobalt, metallic nickel or metal molybdenum; Described pottery is at least one in titanium nitride, aluminium nitride, titanium carbide, tungsten carbide, boron carbide or carborundum.
A preparation method for self-sharpening composite polycrystal-diamond, comprises the following steps:
(1) diadust in chemical acid alkali process, deionized water and post-drying, after hard alloy substrate adopts sandblasting to remove surface passivation thing, pollutant and oxide with acetone cleaning, dry;
(2) diadust after process in step (1), bonding agent are carried out ball milling mixing;
(3) in ball milling mixed process, add binding agent and wetting agent, after mixing under the condition of 700-900 DEG C vacuum drying 10 ~ 15h, be pressed into glomerocryst layer disk;
(4) glomerocryst layer disk compressing for step (3) and hard alloy substrate are put in the molybdenum cup that salt tube shield layer isolates, put the salt pipe installed into graphite jig again, finally load pyrophillite cavity, use conductive plug end socket, be assembled into Synthetic block, Synthetic block is put into dry 0.5 ~ 2h in the baking oven of 120 DEG C, then form polycrystalline diamond-hard alloy matrix composite sheet by high pressure high temperature sintering;
(5) the polycrystalline diamond-hard alloy matrix composite sheet sintered into, becomes difform composite sheet through Linear cut or Laser cutting, composite sheet through grinding, put the first edge on a knife or a pair of scissors, check obtained Finished blades.
Binding agent in described step (3) is 502 glue, and wetting agent is acetone or alcohol.
The amount adding binding agent in described step (3) accounts for 2 ‰ ~ 7 ‰ of polycrystalline diamond glomerocryst stratum total, adds the amount of wetting agent with moistening diamond powder and bonding agent.
Described step (4) high pressure high temperature sintering forms polycrystalline diamond-hard alloy matrix composite sheet, the actual conditions of sintering adopts cubic pressure machine equipment to synthesize, pressure is 4.5 ~ 6.5GPa, temperature 1300 ~ 1500 DEG C, generated time 2 ~ 20min.
Beneficial effect of the present invention: the manufacture of composite polycrystal-diamond introduced by self-sharpening diamond micro mist by the present invention on formula, this diamond crystal contour structures preparing diadust is irregular, rough surface, it is a kind of crystal of mosaic texture, there is the substructure of more complicated, the mode can peeled off gradually with micro-fragment that makes to lose efficacy in grinding and working angles is carried out, and remains sharp cutting edge with activation; Bonding agent is selected metal and pottery, bonding agent and adamantine combination are based on physical absorption, enhanced primary treatment is auxiliary combination, the toughness of material provides primarily of matrix material, each diadust has a lot of cutting edge simultaneously, cutting parameter can be adjusted in working angles in good time, carry out roughing and hyperfine processing, and can automatically peel off and manifest the micro cutting cutting edge made new advances in good time in process, this " self-sharpening " ensure that high accuracy, the high efficiency of processing and can not damage finished surface; Adding of vitrified bond, further enhancing " self-sharpening " and " smoothing " effect of material.The present invention is by controlling the ratio of pottery and metal, and the granularity of ceramic powders, under the effect of pore effect, makes the migration of metallic bond become and difficult for, thus significantly improve the uniformity of composite sheet wear resistance ratio.Simultaneously again because pottery is self-sharpening preferably material, adding of vitrified bond, the self-sharpening of diamond compact material also can be improved.
Self-sharpening composite polycrystal-diamond of the present invention is suitable for high-speed cutting processing and Precision Machining, as milling cutter cuts aluminum alloy speed 4000 more than m/min; When machined surface roughness requires in Ra0.03 ~ 0.10 μm, selection granularity is the cutter material of 3.5 μm; When machined surface roughness requires in Ra0.10 ~ 0.40 μm, selection granularity is the cutter material of 10 μm or 25 μm.Wherein point of a knife fillet angle, cutting parameter will do and adjust as requested.The diamond compact of preparation is also adapted to geological prospecting, and its drilling efficiency improves more than 10%.
Detailed description of the invention
Embodiment 1
The self-sharpening composite polycrystal-diamond of the present embodiment: comprise tungsten-cobalt hard alloy cylinder and polycrystalline diamond glomerocryst layer, the particle diameter that described polycrystalline diamond glomerocryst layer comprises 60% is the diadust of 0.5 μm and the bonding agent of 40%, bonding agent is metallic cobalt and titanium nitride combined binder, wherein metallic cobalt accounts for 11% of polycrystalline diamond glomerocryst layer, and titanium nitride accounts for 29% of polycrystalline diamond glomerocryst layer.
The preparation method of the self-sharpening composite polycrystal-diamond of the present embodiment:
(1) self-sharpening diamond micro mist in chemical acid alkali process, deionized water and post-drying; Clean with acetone, dry after tungsten-cobalt hard alloy cylinder adopts sandblasting to remove surface passivation thing, pollutant and oxide;
(2) diadust after process in step (1) and required bonding agent are carried out ball milling mixing;
(3) in ball milling mixed process, 502 glue accounting for polycrystalline diamond glomerocryst stratum total 2 ‰ and acetone is added, acetone is with moistening powder diamond and bonding agent, after mixing under the condition of 850 DEG C vacuum drying 12h, remove steam, acetone, oxygen and other low melting point volatile matters in powder, be then pressed into glomerocryst layer disk;
(4) glomerocryst layer disk compressing for step (3) and carbide alloy cylinder are put in the molybdenum cup that salt tube shield layer isolates, put the salt pipe installed into graphite jig again, finally load pyrophillite cavity, use conductive plug end socket, be assembled into Synthetic block, Synthetic block is put into dry 0.5h in the baking oven of 120 DEG C, be 4.5GPa by pressure again, temperature is that the cubic pressure machine equipment high pressure high temperature sintering 10min of 1500 DEG C forms polycrystalline diamond-hard alloy cylinder composite sheet;
(5) the polycrystalline diamond-hard alloy cylinder composite sheet sintered into, through Linear cut or the circular composite sheet of Laser cutting, composite sheet through grinding, put the first edge on a knife or a pair of scissors, check obtained Finished blades.
Embodiment 2
The self-sharpening composite polycrystal-diamond of the present embodiment: comprise tungsten-cobalt hard alloy triangle body and polycrystalline diamond glomerocryst layer, the particle diameter that described polycrystalline diamond glomerocryst layer comprises 95% is the diadust of 30 μm and the bonding agent of 5%, bonding agent is the combined binder of metallic nickel and aluminium nitride, wherein metallic nickel accounts for 7% of polycrystalline diamond glomerocryst layer, and aluminium nitride accounts for 3% of polycrystalline diamond glomerocryst layer.
The preparation method of the self-sharpening composite polycrystal-diamond of the present embodiment:
(1) self-sharpening diamond micro mist in chemical acid alkali process, deionized water and post-drying; Clean with acetone, dry after tungsten-cobalt hard alloy triangle body adopts sandblasting to remove surface passivation thing, pollutant and oxide;
(2) diadust after process in step (1) and required bonding agent are carried out ball milling mixing;
(3) in ball milling mixed process, 502 glue accounting for polycrystalline diamond glomerocryst stratum total 7 ‰ and ethanol is added, ethanol is with moistening diamond powder and bonding agent, after mixing under the condition of 700 DEG C vacuum drying 15h, remove steam, acetone, oxygen and other low melting point volatile matters in powder, be then pressed into glomerocryst layer disk;
(4) glomerocryst layer disk compressing for step (3) and hard being closed triangle body puts in the molybdenum cup that salt tube shield layer isolates, put the salt pipe installed into graphite jig again, finally load pyrophillite cavity, use conductive plug end socket, be assembled into Synthetic block, Synthetic block is put into dry 2h in the baking oven of 120 DEG C, then be 6.5GPa by pressure, temperature is that the cubic pressure machine equipment high pressure high temperature sintering 2min of 1500 DEG C forms polycrystalline diamond-hard alloy triangle body composite sheet;
(5) the polycrystalline diamond-hard alloy triangle body composite sheet sintered into, through Linear cut or Laser cutting triangularity composite sheet, composite sheet through grinding, put the first edge on a knife or a pair of scissors, check obtained Finished blades.
Embodiment 3
The self-sharpening composite polycrystal-diamond of the present embodiment: comprise tungsten-cobalt hard alloy triangle body and polycrystalline diamond glomerocryst layer, the particle diameter that described polycrystalline diamond glomerocryst layer comprises 70% is the diadust of 10 μm and the bonding agent of 30%, bonding agent is the combined binder of metal molybdenum and titanium carbide, wherein metal molybdenum accounts for 11% of polycrystalline diamond glomerocryst layer, and titanium carbide accounts for 19% of polycrystalline diamond glomerocryst layer.
The preparation method of the self-sharpening composite polycrystal-diamond of the present embodiment:
(1) self-sharpening diamond micro mist in chemical acid alkali process, deionized water and post-drying; Clean with acetone, dry after tungsten-cobalt hard alloy hexahedron adopts sandblasting to remove surface passivation thing, pollutant and oxide;
(2) diadust after process in step (1) and required bonding agent are carried out ball milling mixing;
(3) in ball milling mixed process, 502 glue accounting for polycrystalline diamond glomerocryst stratum total 3 ‰ and ethanol is added, ethanol is with moistening diamond powder and bonding agent, after mixing under the condition of 800 DEG C vacuum drying 12h, remove steam, acetone, oxygen and other low melting point volatile matters in powder, be then pressed into glomerocryst layer disk;
(4) glomerocryst layer disk compressing for step (3) and hard being closed hexahedron puts in the molybdenum cup that salt tube shield layer isolates, put the salt pipe installed into graphite jig again, finally load pyrophillite cavity, use conductive plug end socket, be assembled into Synthetic block, Synthetic block is put into dry 1h in the baking oven of 120 DEG C, then be 5GPa by pressure, temperature is that the cubic pressure machine equipment high pressure high temperature sintering 10min of 1400 DEG C forms polycrystalline diamond-hard alloy hexahedron composite sheet;
(5) the polycrystalline diamond-hard alloy hexahedron composite sheet sintered into, becomes hexagon composite sheet through Linear cut or Laser cutting, composite sheet through grinding, put the first edge on a knife or a pair of scissors, check obtained Finished blades.
Embodiment 4
The self-sharpening composite polycrystal-diamond of the present embodiment: comprise tungsten-cobalt hard alloy rhombogen and polycrystalline diamond glomerocryst layer, the particle diameter that described polycrystalline diamond glomerocryst layer comprises 90% is the diadust of 25 μm and the bonding agent of 10%, bonding agent is the combined binder of metallic cobalt and tungsten carbide, wherein metallic cobalt accounts for 9% of polycrystalline diamond glomerocryst layer, and tungsten carbide accounts for 1% of polycrystalline diamond glomerocryst layer.
The preparation method of the self-sharpening composite polycrystal-diamond of the present embodiment:
(1) self-sharpening diamond micro mist in chemical acid alkali process, deionized water and post-drying; Clean with acetone, dry after tungsten-cobalt hard alloy rhombogen adopts sandblasting to remove surface passivation thing, pollutant and oxide;
(2) diadust after process in step (1) and required bonding agent are carried out ball milling mixing;
(3) in ball milling mixed process, 502 glue accounting for polycrystalline diamond glomerocryst stratum total 4 ‰ and ethanol is added, ethanol is with moistening diamond powder and bonding agent, after mixing under the condition of 750 DEG C vacuum drying 13h, remove steam, acetone, oxygen and other low melting point volatile matters in powder, be then pressed into glomerocryst layer disk;
(4) glomerocryst layer disk compressing for step (3) and hard being closed rhombogen puts in the molybdenum cup that salt tube shield layer isolates, put the salt pipe installed into graphite jig again, finally load pyrophillite cavity, use conductive plug end socket, be assembled into Synthetic block, Synthetic block is put into dry 1h in the baking oven of 120 DEG C, then be 5.5GPa by pressure, temperature is that the cubic pressure machine equipment high pressure high temperature sintering 15min of 1300 DEG C forms polycrystalline diamond-hard alloy rhombogen composite sheet;
(5) the polycrystalline diamond-hard alloy rhombogen composite sheet sintered into, through Linear cut or Laser cutting diamondwise composite sheet, composite sheet through grinding, put the first edge on a knife or a pair of scissors, check obtained Finished blades.
Embodiment 5
The self-sharpening composite polycrystal-diamond of the present embodiment: comprise the positive tetragonal body of tungsten-cobalt hard alloy and polycrystalline diamond glomerocryst layer, the particle diameter that described polycrystalline diamond glomerocryst layer comprises 60% is the diadust of 0.5 μm and the bonding agent of 40%, bonding agent is the combined binder of metallic cobalt and tungsten carbide, titanium nitride, wherein metallic cobalt accounts for 1% of polycrystalline diamond glomerocryst layer, tungsten carbide accounts for 20% of polycrystalline diamond glomerocryst layer, and titanium nitride accounts for 20% of polycrystalline diamond glomerocryst layer.
The preparation method of the self-sharpening composite polycrystal-diamond of the present embodiment:
(1) self-sharpening diamond micro mist in chemical acid alkali process, deionized water and post-drying; Clean with acetone, dry after tungsten-cobalt hard alloy rhombogen adopts sandblasting to remove surface passivation thing, pollutant and oxide;
(2) diadust after process in step (1) and required bonding agent are carried out ball milling mixing;
(3) in ball milling mixed process, 502 glue accounting for polycrystalline diamond glomerocryst stratum total 5 ‰ and acetone is added, acetone is with moistening diamond powder and bonding agent, after mixing under the condition of 850 DEG C vacuum drying 15h, remove steam, acetone, oxygen and other low melting point volatile matters in powder, be then pressed into glomerocryst layer disk;
(4) glomerocryst layer disk compressing for step (3) and hard being closed positive tetragonal body puts in the molybdenum cup that salt tube shield layer isolates, put the salt pipe installed into graphite jig again, finally load pyrophillite cavity, use conductive plug end socket, be assembled into Synthetic block, Synthetic block is put into dry 1.5h in the baking oven of 120 DEG C, be 6GPa by pressure again, temperature is that the cubic pressure machine equipment high pressure high temperature sintering 5min of 1300 DEG C forms the positive tetragonal body composite sheet of polycrystalline diamond-hard alloy;
(5) the positive tetragonal body composite sheet of the polycrystalline diamond-hard alloy sintered into, becomes positive tetragonal body composite sheet through Linear cut or Laser cutting, composite sheet through grinding, put the first edge on a knife or a pair of scissors, check obtained Finished blades.
Embodiment 6
The self-sharpening composite polycrystal-diamond of the present embodiment: the matrix of preparation composite sheet is tungsten-cobalt hard alloy, metal Co powder 0.5%, Ni powder 1%, Mo powder 1%; Pottery WC powder 7%, TiC powder 3%; All the other for average grain diameter be the self-sharpening diamond micro mist of 3.5 μm.
The preparation method of the self-sharpening composite polycrystal-diamond of the present embodiment: self-sharpening diamond micro mist in chemical acid alkali process, deionized water and post-drying; Clean with acetone, dry after carbide alloy cylindrical matrix adopts sandblasting to remove surface passivation thing, pollutant and oxide; Diadust after process is mixed by setting of filling a prescription with bonding agent, and add 502 glue and acetone that mass percent is 3 ‰ in mixed process, acetone is with moistening powder diamond and bonding agent; Required disk is pressed into after compound 850 DEG C of vacuum drying treatment, with the matrix material carbide matrix body piece handled well, assemble according to certain package assembly, wherein the diamond disk of compacting and matrix are put in the molybdenum cup that salt tube shield layer isolates, then put the salt pipe installed into graphite jig, finally load pyrophillite cavity, end socket, be assembled into Synthetic block, put into baking oven dry, then be sintered together formation polycrystalline diamond-hard alloy complex sheet by high pressure high temperature.The actual conditions of sintering adopts cubic pressure machine equipment to synthesize, and pressure is 5.6 GPa, temperature 1420 DEG C, generated time 15 minutes.
The composite polycrystal-diamond microhardness that said method prepares is HV6800, three-point bending method test bending strength is 863 MPa, the wear resistance ratio of employing standard JB/T3235-1999 test compound sheet marginal portion is 185000, and the wear resistance ratio of core is 112000.
This material is mainly used in the manufacture of cutting tool.
Embodiment 7
The self-sharpening composite polycrystal-diamond of the present embodiment: the matrix of preparation composite sheet is tungsten-cobalt hard alloy, metal Co powder 2%, Ni powder 1%, Mo powder 0.5%; Pottery WC powder 10%, TiC powder 1%; All the other for average grain diameter be the self-sharpening diamond powder of 10 μm.
The preparation method of the self-sharpening composite polycrystal-diamond of the present embodiment: self-sharpening diamond micro mist in chemical acid alkali process, deionized water and post-drying, clean with acetone, dry after carbide alloy cylindrical matrix adopts sandblasting to remove surface passivation thing, pollutant and oxide, diadust after process is mixed by setting of filling a prescription with bonding agent, adding mass percent in mixed process is 502 glue of 5 ‰ and appropriate acetone, compound is dry, vacuum, be pressed into required disk, with matrix material carbide matrix body piece, assemble according to certain package assembly, wherein the diamond disk of compacting and matrix are put in the molybdenum cup that salt tube shield layer isolates, put the salt pipe installed into graphite jig again, finally load pyrophillite cavity, end socket, be assembled into Synthetic block, dry in baking oven, formation polycrystalline diamond-hard alloy complex sheet is sintered together again by high pressure high temperature.The actual conditions of sintering adopts cubic pressure machine equipment to synthesize, and pressure is 5.6 GPa, temperature 1420 DEG C, generated time 15 minutes.
The composite polycrystal-diamond microhardness that said method prepares is HV7500, three-point bending method test bending strength is 988 MPa, the wear resistance ratio of employing standard JB/T3235-1999 test compound sheet marginal portion is 265000, and the wear resistance ratio of core is 126000.
Embodiment 8
The self-sharpening composite polycrystal-diamond of the present embodiment: the matrix of preparation composite sheet is tungsten-cobalt hard alloy, metal Co powder 10%; Pottery WC powder 3%, TiC powder 0.5%; All the other for average grain diameter be the self-sharpening diamond powder of 25 μm.
The preparation method of the self-sharpening composite polycrystal-diamond of the present embodiment: above-mentioned raw materials micro mist and matrix, respectively through chemical acid alkali process, physical vacuum processing method, remove the impurity of raw material, surface passivation thing, pollutant and oxide.
Above-mentioned raw materials micro mist is mixed in setting ratio, adding mass percent in mixed process is 502 glue of 5 ‰ and appropriate acetone, compound is dry, vacuum, be pressed into required disk, with matrix material carbide matrix body piece, assemble according to certain package assembly, wherein the diamond disk of compacting and matrix are put in the molybdenum cup that salt tube shield layer isolates, put the salt pipe installed into graphite jig again, finally load pyrophillite cavity, end socket, be assembled into Synthetic block, dry in baking oven, formation polycrystalline diamond-hard alloy complex sheet is sintered together again by high pressure high temperature.The actual conditions of sintering adopts cubic pressure machine equipment to synthesize, and pressure is 5.6 GPa, temperature 1420 DEG C, generated time 15 minutes.
The composite polycrystal-diamond microhardness that said method prepares is HV7800, three-point bending method test bending strength is 1013 MPa, the wear resistance ratio of employing standard JB/T3235-1999 test compound sheet marginal portion is 303000, and the wear resistance ratio of core is 223000.
This material is mainly used in the manufacture of boring tool.
Claims (6)
1. a self-sharpening composite polycrystal-diamond, comprise hard alloy substrate and polycrystalline diamond glomerocryst layer, it is characterized in that: described polycrystalline diamond glomerocryst layer comprises the diadust of 60% ~ 95% and the bonding agent of 5% ~ 40%, described bonding agent is metal and Ceramic Composite bonding agent, wherein metal accounts for 1% ~ 11% of polycrystalline diamond glomerocryst layer, and pottery accounts for 1% ~ 40% of polycrystalline diamond glomerocryst layer; The preparation method of described self-sharpening composite polycrystal-diamond comprises the following steps:
(1) diadust in chemical acid alkali process, deionized water and post-drying, after hard alloy substrate adopts sandblasting to remove surface passivation thing, pollutant and oxide with acetone cleaning, dry;
(2) diadust after process in step (1), bonding agent are carried out ball milling mixing;
(3) in ball milling mixed process, add binding agent and wetting agent, after mixing under the condition of 700-900 DEG C vacuum drying 10 ~ 15h, be pressed into glomerocryst layer disk;
(4) glomerocryst layer disk compressing for step (3) and hard alloy substrate are put in the molybdenum cup that salt tube shield layer isolates, put the salt pipe installed into graphite jig again, finally load pyrophillite cavity, use conductive plug end socket, be assembled into Synthetic block, Synthetic block is put into dry 0.5 ~ 2h in the baking oven of 120 DEG C, then form polycrystalline diamond-hard alloy matrix composite sheet by high pressure high temperature sintering;
(5) the polycrystalline diamond-hard alloy matrix composite sheet sintered into, becomes difform composite sheet through Linear cut or Laser cutting, composite sheet through grinding, put the first edge on a knife or a pair of scissors, check obtained Finished blades;
Binding agent in described step (3) is 502 glue, and wetting agent is acetone or alcohol;
The amount adding binding agent in described step (3) accounts for 2 ‰ ~ 7 ‰ of polycrystalline diamond glomerocryst stratum total, adds the amount of wetting agent with moistening diamond powder and bonding agent.
2. self-sharpening composite polycrystal-diamond according to claim 1, is characterized in that: the particle diameter of described diadust is the powder of 0.5 ~ 30 μm.
3. self-sharpening composite polycrystal-diamond according to claim 2, is characterized in that: the particle diameter of described diadust is 3.5 μm, 10 μm or 25 μm.
4. self-sharpening composite polycrystal-diamond according to claim 1, is characterized in that: described hard alloy substrate is the matrix that W-Co kind carbide alloy is made.
5. self-sharpening composite polycrystal-diamond according to claim 1, is characterized in that: described metal is metallic cobalt, metallic nickel or metal molybdenum; Described pottery is at least one in titanium nitride, aluminium nitride, titanium carbide, tungsten carbide, boron carbide or carborundum.
6. the preparation method of self-sharpening composite polycrystal-diamond according to claim 1, it is characterized in that: described step (4) high pressure high temperature sintering forms polycrystalline diamond-hard alloy matrix composite sheet, the actual conditions of sintering adopts cubic pressure machine equipment to synthesize, pressure is 4.5 ~ 6.5GPa, temperature 1300 ~ 1500 DEG C, generated time 2 ~ 20min.
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| CN104014282B (en) * | 2014-06-18 | 2015-09-30 | 吉林大学 | A kind of dimond synneusis preparation method |
| CN104289719B (en) * | 2014-10-23 | 2017-05-10 | 金华中烨超硬材料有限公司 | Polycrystalline diamond compact with embedded structure and manufacturing method thereof |
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| WO2011011771A2 (en) * | 2009-07-24 | 2011-01-27 | Diamond Innovations, Inc. | Metal-free supported polycrystalline diamond (pcd) and method to form |
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| CN103158287A (en) * | 2011-12-09 | 2013-06-19 | 郑州博特硬质材料有限公司 | Glomerocryst cubic boron nitride composite sheet and preparation method for same |
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