CN103722174A - Self-sharpening polycrystalline diamond compact and preparation method thereof - Google Patents
Self-sharpening polycrystalline diamond compact and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a self-sharpening polycrystalline diamond compact and a preparation method thereof. The self-sharpening polycrystalline diamond compact comprises a hard alloy base body and a polycrystalline diamond polycrystalline layer, wherein the polycrystalline diamond polycrystalline layer comprises 60-95% of diamond micro-powder and 5%-40% of binding agents, the binding agents are composite binding agents of metal and ceramics, the metal accounts for 1%-11% of the polycrystalline diamond polycrystalline layer, and the ceramics accounts for 1%-40% of the polycrystalline diamond polycrystalline layer, and the diamond micro-powder and the binding agents form the diamond compact respectively through chemical acid-base processing, physical vacuum processing, ball mill mixing, compression moulding and final high-temperature and high-pressure sintering. The diamond compact is good in self-sharpening, even in abrasive ratio and suitable for high-speed cutting machining and precise machining of non-black metal and geological prospecting.
Description
Technical field
The present invention relates to cutting and Milling Process and use the preparing technical field of super-hard compound material cutter, be specifically related to a kind of self-sharpening composite polycrystal-diamond and preparation method thereof.
Background technology
It is apt to work wish row, must first sharpen his tools.In metal cutting technology, the material of improvement of cutter has more potentiality for raising stock-removing efficiency, reduction cutting cost than the change of other any processes, 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 of carrying out energetically cutter new material.Under the promotion of this understanding, external new cutter material, efficient cutter new product and cutter are manufactured new technology and are continued to bring out.The kind of superhard cutter constantly increases at present, not only has lathe tool, boring cutter, reamer, milling cutter, molding cutter, also has the cutter for the manufacture of some gears, and meanwhile output is also in continuous increase.Polycrystalline diamond (Polycrystalline Diamond the is called for short PCD) high-speed milling cutter (six swords, diameter ￠ 100mm) that for example adopts aluminum substrate cutterhead, more than maximum speed can reach 20000r/min, 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 blades is more and more, and its tool life can improve tens times compared with hard alloy cutter.Can manufacture at present high-end polycrystalline diamond (containing assorted polycrystalline diamond) cutter material is all imported product, the following aspects of having traced it to its cause: 1. diamond raw material.The Carbonado(card Beneteau existing at occurring in nature) 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 advantages of without cleavage surface, good impact resistance.Be abroad the PCD developing on the basis of the natural polycrystalline diamond of research, diamond raw material is had to harsh requirement.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 150,000-250,000, and inner and edge differs less than 80,000; The wear resistance ratio of domestic polycrystalline diamond is generally between 300,000-1,000,000, and inner and edge differs very big.Also thick several particle size fraction of adamantine granularity home products used.4. processing characteristics.On service life and in processing roughness, there is very large gap with external product.The self-sharpening of external product is good, and diamond and bonding agent reach substantially synchronizes the effect of wearing and tearing, long service life, and self-sharpening determined that external instrument, to add man-hour stressed less, is conducive to cutting and creeps into, and generates heat little, the finished surface of not burning part; Due to fine size, the fineness of finished surface has reached 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 stop process, the blade more renewing, causes production cost obviously to increase.
In order to overcome above-mentioned deficiency, people start to improve the toughness of polycrystal diamond cutter material.Chinese patent 201110148812 discloses a kind of preparation method of CNT enhancing 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 make 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 wedge shape and is embedded on hard alloy substrate layer, diamond layer edge is that other positions of Thickness Ratio of effective operating position are thick like this, thereby 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 can better improve impact strength.More than, just from the toughness of material, part has solved the combined strength bination problem of oarse-grained diamond drop-off problem and diamond and carbide alloy, from cutting abrasion mechanism, does not improve, 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 take polycrystalline diamond as glomerocryst layer, the composite sheet forming through the common sintering of HTHP take carbide alloy as matrix.Due to carbide alloy good toughness, conventionally adopt carbide alloy as matrix, prepare composite sheet with polycrystalline diamond.Common diamond compact, hard alloy substrate and glomerocryst layer chemical component difference are large, thermal coefficient of expansion difference, composite sheet easily ftractures, delamination, during use, is greatly limited.
Summary of the invention
Technical problem to be solved by this invention be easily ftracture while 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 60%～95% diadust and 5%～40% bonding agent, 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 μ m.
The particle diameter of described diadust is 3.5 μ m, 10 μ m or 25 μ m.
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 through in chemical acid alkali processing, deionized water and post-drying, hard alloy substrate adopts sandblast to remove after surface passivation thing, pollutant and oxide and cleans, dries with acetone;
(2) diadust after treatment, bonding agent in step (1) are carried out to ball milling mixing;
(3) in ball milling mixed process, add binding agent and wetting agent, after mixing under the condition of 700-900 ℃ vacuum drying 10 ~ 15h, be pressed into glomerocryst layer disk;
(4) glomerocryst layer disk compressing step (3) and hard alloy substrate are put in the molybdenum cup of salt tube shield layer isolation, put the salt pipe installing into graphite jig again, finally pack pyrophillite cavity into, use conductive plug end socket, be assembled into synthetic piece, synthetic piece is put into dry 0.5 ~ 2h in the baking oven of 120 ℃, then formed polycrystalline diamond-hard alloy matrix composite sheet by high pressure high temperature sintering;
(5) the polycrystalline diamond-hard alloy matrix composite sheet sintering into, warp cutting or Laser cutting become difform composite sheet, composite sheet through grinding, put the first edge on a knife or a pair of scissors, check and make finished product blade.
Binding agent in described step (3) is 502 glue, and wetting agent is acetone or alcohol.
In described step (3), add the amount of binding agent to account for 2 ‰～7 ‰ of polycrystalline diamond glomerocryst stratum total, add 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 is to adopt cubic pressure machine equipment to synthesize, pressure is 4.5～6.5GPa, 1300～1500 ℃ of temperature, generated time 2～20min.
Beneficial effect of the present invention: the present invention introduces self-sharpening diamond micro mist the manufacture of composite polycrystal-diamond on formula, this diamond crystal contour structures of preparing diadust is irregular, rough surface, it is a kind of crystal of mosaic texture, there is the substructure of more complicated, the mode that can peel off gradually with micro-fragment that makes to lose efficacy in grinding and working angles is carried out, and with activation, remains sharp cutting edge; On bonding agent, select metal and pottery, bonding agent and adamantine combination are take physical absorption as main, chemical metallurgy is combined into auxiliary combination, the toughness of material is mainly provided by matrix material, each diadust has a lot of cutting edges simultaneously, in working angles, can adjust cutting parameter in good time, carry out roughing and hyperfine processing, and in process, can automatically peel off in good time and manifest the micro cutting cutting edge making new advances, this " self-sharpening " guaranteed high accuracy, the high efficiency of processing and can not damage finished surface; Adding of vitrified bond, further strengthened " 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 difficulty, thereby greatly improved the uniformity of composite sheet wear resistance ratio.Again because pottery is preferably material of self-sharpening, adding of vitrified bond, also can improve the self-sharpening of diamond compact material simultaneously.
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 more than speed 4000 m/min; When machined surface roughness requires at Ra0.03～0.10 μ m, selecting granularity is the cutter material of 3.5 μ m; When machined surface roughness requires at Ra0.10～0.40 μ m, selecting granularity is the cutter material of 10 μ m or 25 μ m.Wherein point of a knife fillet angle, cutting parameter will do as requested and adjust.The diamond compact of preparation is also adapted to geological prospecting, and its drilling efficiency improves more than 10%.
The specific embodiment
Embodiment 1
The self-sharpening composite polycrystal-diamond of the present embodiment: comprise tungsten-cobalt hard alloy cylinder and polycrystalline diamond glomerocryst layer, described polycrystalline diamond glomerocryst layer comprises that 60% particle diameter is the diadust of 0.5 μ m and 40% bonding agent, 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 is passed through in chemical acid alkali processing, deionized water and post-drying; After tungsten-cobalt hard alloy cylinder employing sandblast removal surface passivation thing, pollutant and oxide, with acetone, clean, dry;
(2) diadust after treatment in step (1) and required bonding agent are carried out to ball milling mixing;
(3) in ball milling mixed process, add 502 glue and the acetone that account for polycrystalline diamond glomerocryst stratum total 2 ‰, acetone is with moistening powder diamond and bonding agent, after mixing under the condition of 850 ℃ 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 step (3) and carbide alloy cylinder are put in the molybdenum cup of salt tube shield layer isolation, put the salt pipe installing into graphite jig again, finally pack pyrophillite cavity into, use conductive plug end socket, be assembled into synthetic piece, synthetic piece is put into dry 0.5h in the baking oven of 120 ℃, by pressure, be 4.5GPa again, temperature is that the cubic pressure machine equipment high pressure high temperature sintering 10min of 1500 ℃ forms polycrystalline diamond-hard alloy cylinder composite sheet;
(5) the polycrystalline diamond-hard alloy cylinder composite sheet sintering into, warp cutting 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 and make finished product blade.
Embodiment 2
The self-sharpening composite polycrystal-diamond of the present embodiment: comprise tungsten-cobalt hard alloy triangle body and polycrystalline diamond glomerocryst layer, described polycrystalline diamond glomerocryst layer comprises that 95% particle diameter is the diadust of 30 μ m and 5% bonding agent, 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 is passed through in chemical acid alkali processing, deionized water and post-drying; After tungsten-cobalt hard alloy triangle body employing sandblast removal surface passivation thing, pollutant and oxide, with acetone, clean, dry;
(2) diadust after treatment in step (1) and required bonding agent are carried out to ball milling mixing;
(3) in ball milling mixed process, add 502 glue and the ethanol that account for polycrystalline diamond glomerocryst stratum total 7 ‰, ethanol is with moistening diamond powder and bonding agent, after mixing under the condition of 700 ℃ 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 step (3) and hard being closed to triangle body puts in the molybdenum cup of salt tube shield layer isolation, put the salt pipe installing into graphite jig again, finally pack pyrophillite cavity into, use conductive plug end socket, be assembled into synthetic piece, synthetic piece is put into dry 2h in the baking oven of 120 ℃, then be 6.5GPa by pressure, temperature is that the cubic pressure machine equipment high pressure high temperature sintering 2min of 1500 ℃ forms polycrystalline diamond-hard alloy triangle body composite sheet;
(5) the polycrystalline diamond-hard alloy triangle body composite sheet sintering into, warp cutting or Laser cutting triangularity composite sheet, composite sheet through grinding, put the first edge on a knife or a pair of scissors, check and make finished product blade.
Embodiment 3
The self-sharpening composite polycrystal-diamond of the present embodiment: comprise tungsten-cobalt hard alloy triangle body and polycrystalline diamond glomerocryst layer, described polycrystalline diamond glomerocryst layer comprises that 70% particle diameter is the diadust of 10 μ m and 30% bonding agent, 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 is passed through in chemical acid alkali processing, deionized water and post-drying; After tungsten-cobalt hard alloy hexahedron employing sandblast removal surface passivation thing, pollutant and oxide, with acetone, clean, dry;
(2) diadust after treatment in step (1) and required bonding agent are carried out to ball milling mixing;
(3) in ball milling mixed process, add 502 glue and the ethanol that account for polycrystalline diamond glomerocryst stratum total 3 ‰, ethanol is with moistening diamond powder and bonding agent, after mixing under the condition of 800 ℃ 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 step (3) and hard being closed to hexahedron puts in the molybdenum cup of salt tube shield layer isolation, put the salt pipe installing into graphite jig again, finally pack pyrophillite cavity into, use conductive plug end socket, be assembled into synthetic piece, synthetic piece is put into dry 1h in the baking oven of 120 ℃, then be 5GPa by pressure, temperature is that the cubic pressure machine equipment high pressure high temperature sintering 10min of 1400 ℃ forms polycrystalline diamond-hard alloy hexahedron composite sheet;
(5) the polycrystalline diamond-hard alloy hexahedron composite sheet sintering into, warp cutting or Laser cutting become hexagon composite sheet, composite sheet through grinding, put the first edge on a knife or a pair of scissors, check and make finished product blade.
Embodiment 4
The self-sharpening composite polycrystal-diamond of the present embodiment: comprise tungsten-cobalt hard alloy rhombogen and polycrystalline diamond glomerocryst layer, described polycrystalline diamond glomerocryst layer comprises that 90% particle diameter is the diadust of 25 μ m and 10% bonding agent, 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 is passed through in chemical acid alkali processing, deionized water and post-drying; After tungsten-cobalt hard alloy rhombogen employing sandblast removal surface passivation thing, pollutant and oxide, with acetone, clean, dry;
(2) diadust after treatment in step (1) and required bonding agent are carried out to ball milling mixing;
(3) in ball milling mixed process, add 502 glue and the ethanol that account for polycrystalline diamond glomerocryst stratum total 4 ‰, ethanol is with moistening diamond powder and bonding agent, after mixing under the condition of 750 ℃ 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 step (3) and hard being closed to rhombogen puts in the molybdenum cup of salt tube shield layer isolation, put the salt pipe installing into graphite jig again, finally pack pyrophillite cavity into, use conductive plug end socket, be assembled into synthetic piece, synthetic piece is put into dry 1h in the baking oven of 120 ℃, then be 5.5GPa by pressure, temperature is that the cubic pressure machine equipment high pressure high temperature sintering 15min of 1300 ℃ forms polycrystalline diamond-hard alloy rhombogen composite sheet;
(5) the polycrystalline diamond-hard alloy rhombogen composite sheet sintering into, warp cutting or Laser cutting diamondwise composite sheet, composite sheet through grinding, put the first edge on a knife or a pair of scissors, check and make finished product blade.
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, described polycrystalline diamond glomerocryst layer comprises that 60% particle diameter is the diadust of 0.5 μ m and 40% bonding agent, 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 is passed through in chemical acid alkali processing, deionized water and post-drying; After tungsten-cobalt hard alloy rhombogen employing sandblast removal surface passivation thing, pollutant and oxide, with acetone, clean, dry;
(2) diadust after treatment in step (1) and required bonding agent are carried out to ball milling mixing;
(3) in ball milling mixed process, add 502 glue and the acetone that account for polycrystalline diamond glomerocryst stratum total 5 ‰, acetone is with moistening diamond powder and bonding agent, after mixing under the condition of 850 ℃ 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 step (3) and hard being closed to positive tetragonal body puts in the molybdenum cup of salt tube shield layer isolation, put the salt pipe installing into graphite jig again, finally pack pyrophillite cavity into, use conductive plug end socket, be assembled into synthetic piece, synthetic piece is put into dry 1.5h in the baking oven of 120 ℃, by pressure, be 6GPa again, temperature is that the cubic pressure machine equipment high pressure high temperature sintering 5min of 1300 ℃ forms the positive tetragonal body composite sheet of polycrystalline diamond-hard alloy;
(5) the positive tetragonal body composite sheet of polycrystalline diamond-hard alloy sintering into, warp cutting or Laser cutting become positive tetragonal body composite sheet, composite sheet through grinding, put the first edge on a knife or a pair of scissors, check and make finished product blade.
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 μ m.
The preparation method of the self-sharpening composite polycrystal-diamond of the present embodiment: self-sharpening diamond micro mist is passed through in chemical acid alkali processing, deionized water and post-drying; After carbide alloy cylindrical matrix employing sandblast removal surface passivation thing, pollutant and oxide, with acetone, clean, dry; Diadust after treatment and bonding agent are set and mixed by formula, and in mixed process, adding mass percent is 3 ‰ 502 glue and acetone, and acetone is with moistening powder diamond and bonding agent; After 850 ℃ of vacuum drying treatment of compound, be pressed into required disk, with the matrix material hard alloy substrate sheet of handling well, according to certain package assembly assembling, wherein the diamond disk of compacting and matrix are put in the molybdenum cup of salt tube shield layer isolation, then put the salt pipe installing into graphite jig, finally pack pyrophillite cavity into, end socket, be assembled into synthetic piece, 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 is to adopt cubic pressure machine equipment to synthesize, and pressure is 5.6 GPa, 1420 ℃ of temperature, 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 μ m.
The preparation method of the self-sharpening composite polycrystal-diamond of the present embodiment: self-sharpening diamond micro mist is passed through in chemical acid alkali processing, deionized water and post-drying, after carbide alloy cylindrical matrix employing sandblast removal surface passivation thing, pollutant and oxide, with acetone, clean, dry, diadust after treatment is set and mixed by formula with bonding agent, in mixed process, adding mass percent is 5 ‰ 502 glue and appropriate acetone, compound is dry, vacuum, be pressed into required disk, with matrix material hard alloy substrate sheet, according to certain package assembly assembling, wherein the diamond disk of compacting and matrix are put in the molybdenum cup of salt tube shield layer isolation, put the salt pipe installing into graphite jig again, finally pack pyrophillite cavity into, end socket, be assembled into synthetic piece, dry in baking oven, by high pressure high temperature, be sintered together formation polycrystalline diamond-hard alloy complex sheet again.The actual conditions of sintering is to adopt cubic pressure machine equipment to synthesize, and pressure is 5.6 GPa, 1420 ℃ of temperature, 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 μ m.
The preparation method of the self-sharpening composite polycrystal-diamond of the present embodiment: above-mentioned raw materials micro mist and matrix pass through respectively chemical acid alkali processing, physical vacuum processing method, the impurity of removal raw material, surface passivation thing, pollutant and oxide.
Above-mentioned raw materials micro mist is mixed by preset proportion, in mixed process, adding mass percent is 5 ‰ 502 glue and appropriate acetone, compound is dry, vacuum, be pressed into required disk, with matrix material hard alloy substrate sheet, according to certain package assembly assembling, wherein the diamond disk of compacting and matrix are put in the molybdenum cup of salt tube shield layer isolation, put the salt pipe installing into graphite jig again, finally pack pyrophillite cavity into, end socket, be assembled into synthetic piece, dry in baking oven, by high pressure high temperature, be sintered together formation polycrystalline diamond-hard alloy complex sheet again.The actual conditions of sintering is to adopt cubic pressure machine equipment to synthesize, and pressure is 5.6 GPa, 1420 ℃ of temperature, 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 (9)
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 60%～95% diadust and 5%～40% bonding agent, 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.
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 μ m.
3. self-sharpening composite polycrystal-diamond according to claim 2, is characterized in that: the particle diameter of described diadust is 3.5 μ m, 10 μ m or 25 μ m.
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. according to the preparation method of the self-sharpening composite polycrystal-diamond described in any one in claim 1-5, it is characterized in that: comprise the following steps:
(1) diadust through in chemical acid alkali processing, deionized water and post-drying, hard alloy substrate adopts sandblast to remove after surface passivation thing, pollutant and oxide and cleans, dries with acetone;
(2) diadust after treatment, bonding agent in step (1) are carried out to ball milling mixing;
(3) in ball milling mixed process, add binding agent and wetting agent, after mixing under the condition of 700-900 ℃ vacuum drying 10 ~ 15h, be pressed into glomerocryst layer disk;
(4) glomerocryst layer disk compressing step (3) and hard alloy substrate are put in the molybdenum cup of salt tube shield layer isolation, put the salt pipe installing into graphite jig again, finally pack pyrophillite cavity into, use conductive plug end socket, be assembled into synthetic piece, synthetic piece is put into dry 0.5 ~ 2h in the baking oven of 120 ℃, then formed polycrystalline diamond-hard alloy matrix composite sheet by high pressure high temperature sintering;
(5) the polycrystalline diamond-hard alloy matrix composite sheet sintering into, warp cutting or Laser cutting become difform composite sheet, composite sheet through grinding, put the first edge on a knife or a pair of scissors, check and make finished product blade.
7. the preparation method of self-sharpening composite polycrystal-diamond according to claim 6, is characterized in that: the binding agent in described step (3) is 502 glue, and wetting agent is acetone or alcohol.
8. the preparation method of self-sharpening composite polycrystal-diamond according to claim 6, it is characterized in that: in described step (3), add the amount of binding agent to account for 2 ‰～7 ‰ of polycrystalline diamond glomerocryst stratum total, add the amount of wetting agent with moistening diamond powder and bonding agent.
9. the preparation method of self-sharpening composite polycrystal-diamond according to claim 7, 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 is to adopt cubic pressure machine equipment to synthesize, pressure is 4.5～6.5GPa, 1300～1500 ℃ of temperature, generated time 2～20min.
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Cited By (31)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104014282A (en) * | 2014-06-18 | 2014-09-03 | 吉林大学 | Preparation method of polycrystalline diamond |
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| CN104014282B (en) * | 2014-06-18 | 2015-09-30 | 吉林大学 | A kind of dimond synneusis preparation method |
| CN104014282A (en) * | 2014-06-18 | 2014-09-03 | 吉林大学 | Preparation method of polycrystalline diamond |
| CN104289719A (en) * | 2014-10-23 | 2015-01-21 | 金华中烨超硬材料有限公司 | Polycrystalline diamond compact with embedded structure and manufacturing method thereof |
| CN104959616B (en) * | 2015-06-23 | 2017-09-29 | 中南钻石有限公司 | Sandwich type dimond synneusis composite sheet and preparation method thereof and bonding agent used |
| CN104959616A (en) * | 2015-06-23 | 2015-10-07 | 中南钻石有限公司 | Sandwich-type polycrystalline diamond compact and preparation method thereof and used binding agent |
| CN106141191A (en) * | 2015-07-24 | 2016-11-23 | 洛阳新巨能高热技术有限公司 | A kind of thin diamond glomerocryst cutter production technology |
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| US10883317B2 (en) | 2016-03-04 | 2021-01-05 | Baker Hughes Incorporated | Polycrystalline diamond compacts and earth-boring tools including such compacts |
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| CN106498253A (en) * | 2016-09-21 | 2017-03-15 | 芜湖扬展新材料科技服务有限公司 | A kind of polycrystalline diamond composite material with high stable wearability and preparation method thereof |
| CN106984906A (en) * | 2017-05-04 | 2017-07-28 | 河南四方达超硬材料股份有限公司 | The laser processing of oil bit curved surface composite polycrystal-diamond |
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| US11292750B2 (en) | 2017-05-12 | 2022-04-05 | Baker Hughes Holdings Llc | Cutting elements and structures |
| US11396688B2 (en) | 2017-05-12 | 2022-07-26 | Baker Hughes Holdings Llc | Cutting elements, and related structures and earth-boring tools |
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