CN105236401B - A kind of diamond dust and preparation method thereof - Google Patents
A kind of diamond dust and preparation method thereof Download PDFInfo
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- CN105236401B CN105236401B CN201510597823.1A CN201510597823A CN105236401B CN 105236401 B CN105236401 B CN 105236401B CN 201510597823 A CN201510597823 A CN 201510597823A CN 105236401 B CN105236401 B CN 105236401B
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Abstract
The invention discloses a kind of preparation methods of diamond dust, which is characterized in that includes the following steps：It is dry after bortz powder, cetyl trimethylammonium bromide solution, strong base solution and solvent are mixed, obtain diamond dust.Diamond dust provided by the present invention for composite polycrystal-diamond and preparation method thereof, bortz powder and the strong base solution of certain concentration are subjected to alkali process, then by the above-mentioned bortz powder through alkali process in the alcoholic solution of cetyl trimethylammonium bromide, it is reacted, finally obtain diamond dust, i.e. modified bortz powder.The preparation method of the present invention improves the uniformity during mixing of varigrained bortz powder, and even particle size distribution reduces the agglomeration in bortz powder mixed process, and then improves composite polycrystal-diamond quality stability and comprehensive performance.
Description
Technical field
The invention belongs to ultra-hard material poly-crystal diamond compact production technical field more particularly to a kind of diamond dusts
And preparation method thereof.
Background technology
Superhard material is primarily referred to as diamond, it is the substance most hard in the world being currently known, and hardness is all far above
The hardness of the materials such as such as corundum, silicon carbide and cutter material hard alloy, high-speed steel hard tool.Therefore, superhard material
Suitable for being used for manufacturing the tool of processing other materials, especially in terms of hard material is processed, there is unrivaled superiority,
Occupy irreplaceable critical role.Thus superhard material is industrially applied widely.But diamonds it is rare,
It is expensive, the needs of economic development far can not be met, therefore, researcher has synthesized glomerocryst gold using high-pressure synthesis technology
Hard rock (PCD) makes the application range of diamond expand to the multiple fields such as exploration, Aeronautics and Astronautics, automobile, electronics, stone material.With
The further expansion of applications of diamond, relative composite material causes the broad interest of researcher, polycrystalline diamond
Composite sheet is exactly one of them.
Composite polycrystal-diamond is at high temperature under high pressure by many fine-particle diamonds and cement carbide substrate in superelevation
The super-hard compound material being combined under super pressure-high temperature sintering condition, since the structure of polycrystalline diamond is the fine grain that orientation differs
Diamond sinter, though hardness and wearability, less than single-crystal diamond, sintered body shows as isotropism, therefore will not picture
Natural diamond is like that along single cleavage facial cleft, through being mainly used for oil, metallurgy, geological drill bit, expansion frequently as machining tool
Hole device etc. has the characteristics that thermal conductivity is good, impact flexibility is high, wearability is good, hardness is high and self-sharpening is good, particularly has height
Toughness, rate of penetration and timeliness are the manyfold of natural diamond, and can also be effectively in drilling process
Holding aperture.It can also be used to cut nonferrous metal and its alloy, hard alloy and nonmetallic materials, cutting speed simultaneously
For the hundreds of times of hard alloy cutter, durability is thousands of times of hard alloy.Thus it is widely used in oil drilling, geology
The field of machining such as the accurate and half accurate continuously or intermittently machining of exploration and composite material.In addition, with science
The development of technology also becomes the important material of the high-tech areas such as space flight, communication.
With extensive use of the composite polycrystal-diamond in every field, every profession and trade to the stability of its quality and
Performance also proposed higher requirement.Then in the prior art, the synthesis of composite polycrystal-diamond generally uses different-grain diameter
The diadust of size and a small amount of binding agent, form with hard alloy combined sintering, but the polycrystalline diamond synthesized is compound
Tablet quality is inconsistent, and comprehensive performance is unstable, and composite sheet service efficiency is not high.
Thus, how to find a kind of better preparation method so that composite polycrystal-diamond has what is relatively stablized
Quality and higher comprehensive performance are always one of manufacturer's urgent problem to be solved in field.
Invention content
In view of this, the technical problem to be solved in the present invention is to provide a kind of diamond dust and preparation method thereof, this
The diamond dust provided is provided, improves the mixture homogeneity of diamond dust, even particle size distribution reduces bortz powder
Agglomeration in last mixed process, and then improve composite polycrystal-diamond quality stability and comprehensive performance.
The invention discloses a kind of diamond dusts for composite polycrystal-diamond, which is characterized in that by following original
Material is prepared：
Preferably, the size distribution of the diamond dust is 2~22 μm.
Preferably, the highly basic includes sodium hydroxide and/or potassium hydroxide.
Preferably, the solvent is one or more in ethyl alcohol, methanol, ethylene glycol and acetone.
The present invention provides a kind of preparation methods of diamond dust, which is characterized in that includes the following steps：
A it is dry after) mixing bortz powder, cetyl trimethylammonium bromide solution, strong base solution and solvent, obtain gold
Hard rock powder.
Preferably, the step A) be specially：
A1 after) being mixed bortz powder and strong base solution, the bortz powder of alkali process is obtained；
A2) bortz powder for the alkali process for obtaining above-mentioned steps, cetyl trimethylammonium bromide solution and solvent be again
It is dry after secondary mixing, obtain diamond dust.
Preferably, the temperature of the mixing is 60~90 DEG C；The time of the mixing is 2~5 hours；
The temperature mixed again is 50~80 DEG C；The time mixed again is 4~7 hours.
Preferably, the step A1) after, it further includes and carries out the bortz powder of alkali process to be washed to neutrality, and dry；
The pH value of the neutrality is 6~8.
Preferably, the step A2) after, it further includes after diamond dust is washed with alcohols solvent, filters and dry.
The invention also discloses one kind to be used for composite polycrystal-diamond, which is characterized in that by above-mentioned any one technology
Diamond dust, hard alloy and the binding agent prepared by diamond dust or above-mentioned any one technical solution described in scheme
It is sintered.
The invention discloses a kind of diamond dusts for composite polycrystal-diamond, are prepared by following raw material：
The bortz powder of 10~20 parts by weight, the cetyl trimethylammonium bromide of 0.5~4 parts by weight, the highly basic of 20~40 parts by weight,
The water of the solvent of 150~300 parts by weight and 200~400 parts by weight.Compared with prior art, provided by the present invention for glomerocryst
Diamond dust of diamond compact and preparation method thereof, it is uniform when improving the mixing of varigrained bortz powder
Degree, even particle size distribution reduce the agglomeration in bortz powder mixed process, and then improve composite polycrystal-diamond
Quality stability and comprehensive performance.It overcomes in composite polycrystal-diamond preparation process in the prior art, due to different grain size
Bortz powder mixing it is uneven, the composite sheet quality conformance that in turn results in is poor, comprehensive performance is unstable and service efficiency not
The problem of high.Diamond dust good dispersion prepared by the present invention, even particle size distribution, as synthesis composite polycrystal-diamond
Micro mist can uniformly be mixed with binding agent disperse well in mixing process, avoid due to bortz powder grain size
Small, surface can be big, the phenomenon that easily reunion together in batch mixing.So as to improve composite polycrystal-diamond to a certain extent
Impact resistance, wearability, the comprehensive performance for making the composite polycrystal-diamond of synthesis are relatively stable.The experimental results showed that this hair
The size distribution section of the diamond dust for composite polycrystal-diamond of bright preparation is increased to 2 by original 2~35 μm
~22 μm.
Description of the drawings
Fig. 1 is the particle size distribution figure of the untreated diamond dust of the present invention；
Fig. 2 is the particle size distribution figure of diamond dust prepared by the embodiment of the present invention 1；
Fig. 3 is the particle size distribution figure of diamond dust prepared by the embodiment of the present invention 2；
Fig. 4 is the particle size distribution figure of diamond dust prepared by the embodiment of the present invention 3.
Specific embodiment
In order to further appreciate that the present invention, the preferred embodiments of the invention are described with reference to embodiment, but
It is it should be appreciated that these descriptions are only for the feature and advantage that further illustrate the present invention rather than to patent requirements of the present invention
Limitation.
All raw materials of the present invention, are not particularly limited its source, buying on the market or according to people in the art
Known to member prepared by conventional method.
All raw materials of the present invention, are not particularly limited its purity, pure present invention preferably employs analyzing.
Diamond dust of the present invention, i.e., a kind of modification diamond dust for composite polycrystal-diamond.
The invention discloses a kind of diamond dusts for composite polycrystal-diamond, which is characterized in that by following original
Material is prepared：
In the raw material of diamond dust of the present invention for composite polycrystal-diamond, the addition of the bortz powder
Amount preferably 10~20 parts by weight, most preferably more preferably 11~19 parts by weight, 13~17 parts by weight；The bortz powder is excellent
When being selected as composite polycrystal-diamond, the admixed finepowder of a variety of varigrained diadusts, the present invention is to the gold
The particle size range of emery is not particularly limited, according to the difference of the composite polycrystal-diamond of preparation, the granularity of bortz powder
Range is also different therewith；Typically 1~40 μm of the size distribution of bortz powder of the present invention, or 1.5~38 μ
M, or 1.8~35 μm, or 2~35 μm or 2~30 μm；The size distribution of the diamond dust can accomplish
It 1~25 μm, can more accomplish 1.5~24 μm, can more accomplish 1.8~23 μm or 2~22 μm；The present invention to bortz powder other
Condition is not particularly limited, with the bortz powder well known to those skilled in the art for being used to prepare composite polycrystal-diamond i.e.
It can.
The addition of cetyl trimethylammonium bromide of the present invention is preferably 1~2 parts by weight, more preferably 1.1~
1.9 parts by weight, more preferably 1.3~1.7 parts by weight, most preferably 1.4~1.6 parts by weight；The addition of the highly basic is preferred
For 20~40 parts by weight, more preferably 22~38 parts by weight, more preferably 25~35 parts by weight, most preferably 27~32 weight
Part；The highly basic is preferably sodium hydroxide and/or potassium hydroxide, more preferably sodium hydroxide or potassium hydroxide, most preferably hydrogen
Sodium oxide molybdena；The addition of the solvent is preferably 150~300 parts by weight, more preferably 170~280 parts by weight, more preferably
190~260 parts by weight, most preferably 200~250 parts by weight；The solvent is preferably alcohols solvent, more preferably ethyl alcohol, first
It is one or more in alcohol, ethylene glycol and acetone, more preferably ethyl alcohol, methanol, ethylene glycol or butanol, most preferably ethyl alcohol；Institute
The addition for stating water is preferably 200~400 parts by weight, more preferably 220~380 parts by weight, more preferably 250~350 weight
Part, most preferably 280~320 parts by weight；The water is preferably deionized water.The present invention especially limits above-mentioned raw materials without other
System, with requirement of the above-mentioned raw materials well known to those skilled in the art during commonly used.
The diamond dust for composite polycrystal-diamond, i.e., a kind of modification have been prepared by following raw material by the present invention
Diadust effectively solves varigrained bortz powder in mixing process, since the particle size of micro mist is small, table
Face can be big, and the interparticle active force of homogeneity is mainly attraction, causes to easily cause in mixing process and reunite one between particle
The phenomenon that rising.So as to cause the composite polycrystal-diamond quality of synthesis inconsistent, comprehensive performance is unstable, and composite sheet uses effect
The problems such as rate is not high.
The present invention provides a kind of preparation methods of diamond dust, which is characterized in that includes the following steps：
A it is dry after) mixing bortz powder, cetyl trimethylammonium bromide solution, strong base solution and solvent, obtain gold
Hard rock powder.The solvent is preferably alcohols solvent.
In the above-mentioned preparation method of the present invention, raw materials used optimum principle and addition with it is aforementioned prepare it is preferred in raw material
Principle is consistent with addition, and this is no longer going to repeat them.The present invention is dense to the cetyl trimethylammonium bromide solution
Degree is not particularly limited, for improve diamond dust dispersion performance, size distribution evenly, the present invention preferably cetyl three
The mass concentration of methyl bromide ammonium salt solution for 0.01~0.1g/mL, more preferably 0.02~0.08g/mL, most preferably 0.03~
0.06g/mL；The concentration of the strong base solution is not particularly limited in the present invention, to improve the dispersion performance of diamond dust, grain
Degree is more evenly distributed, the mass concentration of the present invention preferably strong base solution for 0.001~0.01mol/mL, more preferably 0.002~
0.008mol/mL, most preferably 0.02~0.006mol/ml.
For the present invention preferably to overcome the interparticle active force of homogeneity, reduction agglomeration increases particle size distribution,
By the step A) specifically carry out according to the following steps, A1) bortz powder and strong base solution are mixed after, obtain alkali process
Bortz powder；A2) bortz powder for the alkali process for obtaining above-mentioned steps, cetyl trimethylammonium bromide solution and solvent be again
It is dry after secondary mixing, obtain diamond dust.
After the present invention is first mixed bortz powder and prepared strong base solution, the diamond of alkali process is obtained
Powder；The temperature of the mixing is preferably 60~90 DEG C, more preferably 65~85 DEG C, most preferably 70~80 DEG C；The mixing
Time is preferably 2~5 hours, more preferably 2.5~4.5 hours, most preferably 3~4 hours；The present invention is to the side of the preparation
Formula and condition are not particularly limited, with manner of formulation well known to those skilled in the art and condition；The present invention is to described mixed
The mode of conjunction is not particularly limited, and with hybrid mode well known to those skilled in the art, the present invention is preferably stirred.
The present invention is first to varigrained bortz powder progress alkali process, the bortz powder surface hydroxylation made, and then
So that follow-up cetyl trimethylammonium bromide solution is preferably modified bortz powder in alcohol based environment, so as to more preferable
The composite polycrystal-diamond diamond dust that is evenly distributed of prepared sizes.
The present invention is improves subsequent modified effect so that bortz powder is preferably modified in alcohol based environment, excellent
It chooses to state and carries out the bortz powder of alkali process to be washed to neutrality, and dry.The present invention is not particularly limited the washing,
With water-washing method well known to those skilled in the art, the present invention is preferably washed with deionized water.The present invention is to institute
Neutrality is stated to be not particularly limited, with the definition of neutrality well known to those skilled in the art, the pH value of neutrality of the present invention
Preferably 6~8, more preferably 6.5~7.5, most preferably 7.The present invention does not limit the mode and condition of the drying especially
System, with drying mode well known to those skilled in the art and condition, the present invention preferably filters drying.
Bortz powder, ethyl alcohol and the prepared cetyl trimethyl bromine for the alkali process that the present invention obtains above-mentioned steps
Change drying after ammonium salt solution mixes again, obtain diamond dust.The temperature mixed again is preferably 50~80 DEG C, more preferably
It is 55~75 DEG C, most preferably 60~70 DEG C；The time mixed again is preferably 4~7 hours, more preferably 4.5~6.5
Hour, most preferably 5~6 hours.The mode mixed again is not particularly limited in the present invention, with those skilled in the art
Well known hybrid mode, the present invention are preferably stirred.
The present invention does not have the process for preparation of the prepared cetyl trimethylammonium bromide solution (CTAB dilutions)
There is special limitation, with the process for preparation of CTAB dilutions well known to those skilled in the art, the present invention is preferably by CTAB
With deionized water in instrument is cleaned by ultrasonic 30~40min of ultrasonic disperse, then under room temperature (20~30 DEG C) hydrolyze 1.5~2.5h,
CTAB dilutions are made.
The present invention is further promotes modified effect, after preferably diamond dust is washed with alcohols solvent, by filtering
After being dried again, diamond dust is obtained.The alcohols solvent is not particularly limited in the present invention, with those skilled in the art
The well known alcohols solvent for washing, the present invention are preferably one kind or more in ethyl alcohol, methanol, ethylene glycol and butanol
Kind, more preferably ethyl alcohol, methanol, ethylene glycol or butanol, most preferably ethyl alcohol.The present invention does not have the mode and condition of the suction filtration
There is special limitation, be preferably filtered by vacuum with condition, the present invention in a manner of suction filtration well known to those skilled in the art；This hair
Bright mode and condition to the drying is not particularly limited, and is with drying mode well known to those skilled in the art and condition
Can, the present invention is preferably drying box drying, and drying temperature is preferably 80~100 DEG C, more preferably 85~95 DEG C, most preferably 87
~92 DEG C；The drying time is preferably 5~10 hours, more preferably 6~9 hours, most preferably 7~8 hours.
The present invention uses alcohols solvent as solvent, and an alcohol based environment is constructed when being modified diamond for CTAB dilutions.
So that the bortz powder of surface hydroxylation, is preferably modified in anhydrous alcohol based environment, dispersibility is made preferably
Diadust.It is modified by the above method, diamond dust is made to form the particle with electric double layer structure, due to double
Electric layer electrostatic force perseverance is repulsion, prevents interparticle reunion；And modified micro mist surface can form layer protecting film
Steric hindrance is generated, can largely weaken interparticle attraction, so that when powder particle is close to each other, effectively
The interparticle reunion of inhibition.The experimental results showed that the diamond dust for composite polycrystal-diamond prepared by the present invention
Size distribution be increased to 2~22 μm by original 2~35 μm.
The invention also discloses one kind for composite polycrystal-diamond, as the gold described in above-mentioned any one technical solution
Diamond dust, hard alloy and binding agent prepared by hard rock powder or above-mentioned any one technical solution are sintered.
The hard alloy is not particularly limited in the present invention, and polycrystalline diamond is used for well known to those skilled in the art
The hard alloy of composite sheet；The binding agent is not particularly limited in the present invention, with use well known to those skilled in the art
In the binding agent of composite polycrystal-diamond；The technical process of the sintering is not particularly limited in the present invention, with ability
For the technical process of composite polycrystal-diamond sintering known to field technique personnel.
The diamond dust that the present invention is obtained by above-mentioned steps in the mixing process of synthesis composite polycrystal-diamond,
It preferably can uniformly mix, be avoided since varigrained diadust is in mixing process with binding agent disperse
In, micro powder granule size is small, and surface can be big, and the interparticle active force of homogeneity is mainly attraction, is caused in mixing process
Easily cause the problem of reuniting together between particle.Thus, modification diamond dust prepared by the present invention is as synthesis glomerocryst Buddha's warrior attendant
During the raw material of stone composite sheet, the composite sheet quality conformance of synthesis is good, and comprehensive performance is stablized, and the service efficiency of product is higher.
The experimental results showed that the composite polycrystal-diamond being sintered using diamond dust prepared by the present invention, the impact energy born
For 600~1500J, area wear resistance ratio is 3,100,000~3,650,000；And the glomerocryst gold that non-modified diamond dust is used to be sintered
Hard rock composite sheet, the impact energy born are 450~1000, and area wear resistance ratio is 2,600,000~3,000,000, is improved compared to maximum
50% and 21%.
For a further understanding of the present invention, with reference to embodiment to diamond dust provided by the invention and its preparation side
Method illustrates, and protection scope of the present invention is not limited by the following examples.
Embodiment 1
The NaOH solid powders of 20g are taken first in beaker, and 100ml deionized water dissolvings are added in, and use glass bar to it
It continuously stirs, until solution is clarified.The volumetric flask that will dissolve clear NaOH solution and be carefully injected into 250ml specifications with glass bar
In, the NaOH solution that substance withdrawl syndrome is 0.002mol/ml is made.
Varigrained diadust is added in the beaker for the NaOH solution for filling above-mentioned preparation, wherein diamond
Micro mist is 1 with NaOH mass ratioes:2, beaker is placed on magnetic stirring apparatus the constant temperature at 80 DEG C and is stirred to react 3h, after reaction
It is washed repeatedly with deionized water to neutrality, filters drying, obtain the bortz powder after alkali process, it is spare to be packed into reagent bottle.
By CTAB in beaker, 100ml deionized waters are added in, ultrasonic disperse 30min, quiet at room temperature in instrument is cleaned by ultrasonic
Hydrolysis 2h is put, the CTAB dilutions that mass concentration is 0.03g/ml are made.
Bortz powder after above-mentioned alkali process is put into beaker, above-mentioned CTAB dilutions is added in it, CTAB is made to account for gold
The 1wt% of emery, while 200ml absolute ethyl alcohols are added in into beaker, beaker is placed on magnetic stirring apparatus, it is permanent at 70 DEG C
Temperature stirring 5h.After reaction, then with absolute ethyl alcohol washes clean, after vacuum filtration, in drying box at 80 DEG C dry 8h,
The diamond dust being modified through CTAB is made.
Size distribution detection is carried out to diamond dust prepared by above-described embodiment 1, for size distribution referring to Fig. 1, Fig. 1 is this
The particle size distribution figure of diamond dust prepared by inventive embodiments 1；Referring to Fig. 2, Fig. 2 is the grain of non-modified diamond dust
Spend distribution map.By Fig. 1 and Fig. 2 comparisons it is found that the size distribution of unmodified diadust is 2.41~30.75 μm, granularity
D10=2.41 μm, D50=12.78 μm, D90=30.75 μm of distribution；The granularity of diamond dust prepared by the embodiment of the present invention 1
Distributed area is 1.85~20.14 μm, D10=1.85 μm, D50=10.12 μm, D90=20.14 μm of size distribution；Thus may be used
Know that the size distribution of modification diadust prepared by the present invention is more uniform, and be in normal distribution substantially, and unmodified gold
Hard rock micro mist distributed area is apparent wide in range in multi-modal, and with the presence of bulky grain.
The glomerocryst Buddha's warrior attendant synthesized jointly to modification diadust, hard alloy and binding agent prepared by above-described embodiment 1
Stone composite sheet carries out performance detection, and the impact energy born is 1400J, and area wear resistance ratio is 3,600,000.
Embodiment 2
The NaOH solid powders of 25g are taken first in beaker, and 150ml deionized water dissolvings are added in, and use glass bar to it
It continuously stirs, until solution is clarified.The volumetric flask that will dissolve clear NaOH solution and be carefully injected into 250ml specifications with glass bar
In, the NaOH solution that substance withdrawl syndrome is 0.0025mol/ml is made.
Varigrained diadust is added in the beaker for the NaOH solution for filling above-mentioned preparation, wherein diamond
Micro mist is 1 with NaOH mass ratioes:2, beaker is placed on magnetic stirring apparatus the constant temperature at 80 DEG C and is stirred to react 3h, after reaction
It is washed repeatedly with deionized water to neutrality, filters drying, obtain the bortz powder after alkali process, it is spare to be packed into reagent bottle.
By CTAB in beaker, 100ml deionized waters are added in, ultrasonic disperse 30min, quiet at room temperature in instrument is cleaned by ultrasonic
Hydrolysis 2h is put, the CTAB dilutions that mass concentration is 0.03g/ml are made.
Bortz powder after above-mentioned alkali process is put into beaker, above-mentioned CTAB dilutions is added in it, CTAB is made to account for gold
The 2wt% of emery, while 250ml absolute ethyl alcohols are added in into beaker, beaker is placed on magnetic stirring apparatus, it is permanent at 65 DEG C
Temperature stirring 5h.After reaction, then with absolute ethyl alcohol washes clean, after vacuum filtration, in drying box at 80 DEG C dry 8h,
The diamond dust being modified through CTAB is made.
Size distribution detection is carried out to diamond dust prepared by above-described embodiment 2, for size distribution referring to Fig. 3, Fig. 3 is this
The particle size distribution figure of diamond dust prepared by inventive embodiments 2.From the figure 3, it may be seen that bortz powder prepared by the embodiment of the present invention 2
The size distribution at end is 2.23~21.45 μm, D10=2.23 μm, D50=10.52 μm, D90=21.45 μm of size distribution；By
This understands that the size distribution of modification diadust prepared by the present invention is more uniform, and is in normal distribution substantially.
The glomerocryst Buddha's warrior attendant synthesized jointly to modification diadust, hard alloy and binding agent prepared by above-described embodiment 2
Stone composite sheet carries out performance detection, and the impact energy born is 1200J, and area wear resistance ratio is 3,450,000.
Embodiment 3
The NaOH solid powders of 30g are taken first in beaker, and 200ml deionized water dissolvings are added in, and use glass bar to it
It continuously stirs, until solution is clarified.The volumetric flask that will dissolve clear NaOH solution and be carefully injected into 250ml specifications with glass bar
In, the NaOH solution that substance withdrawl syndrome is 0.003mol/ml is made.
Varigrained diadust is added in the beaker for the NaOH solution for filling above-mentioned preparation, wherein diamond
Micro mist is 1 with NaOH mass ratioes:2, beaker is placed on magnetic stirring apparatus the constant temperature at 80 DEG C and is stirred to react 3h, after reaction
It is washed repeatedly with deionized water to neutrality, filters drying, obtain the bortz powder after alkali process, it is spare to be packed into reagent bottle.
By CTAB in beaker, 100ml deionized waters are added in, ultrasonic disperse 30min, quiet at room temperature in instrument is cleaned by ultrasonic
Hydrolysis 2h is put, the CTAB dilutions that mass concentration is 0.03g/ml are made.
Bortz powder after above-mentioned alkali process is put into beaker, above-mentioned CTAB dilutions is added in it, CTAB is made to account for gold
The 1wt% of emery, while 300ml absolute ethyl alcohols are added in into beaker, beaker is placed on magnetic stirring apparatus, it is permanent at 70 DEG C
Temperature stirring 6h.After reaction, then with absolute ethyl alcohol washes clean, after vacuum filtration, in drying box at 80 DEG C dry 8h,
The diamond dust being modified through CTAB is made.
Size distribution detection is carried out to diamond dust prepared by above-described embodiment 3, for size distribution referring to Fig. 4, Fig. 4 is this
The particle size distribution figure of diamond dust prepared by inventive embodiments 3.As shown in Figure 4, the bortz powder that prepared by the embodiment of the present invention 3
The size distribution at end is 2.36~21.67 μm, D10=2.36 μm, D50=10.80 μm, D90=21.67 μm of size distribution；By
This understands that the size distribution of modification diadust prepared by the present invention is more uniform, and is in normal distribution substantially.
The glomerocryst Buddha's warrior attendant synthesized jointly to modification diadust, hard alloy and binding agent prepared by above-described embodiment 3
Stone composite sheet carries out performance detection, and the impact energy born is 1000J, and area wear resistance ratio is 3,250,000.
A kind of diamond dust provided by the present invention and preparation method thereof is described in detail above.Herein should
The principle of the present invention and embodiment are expounded with a specific example, the explanation of above example is only intended to help
Understand the method and its core concept of the present invention.It should be pointed out that it for those skilled in the art, is not taking off
Under the premise of from the principle of the invention, can also to the present invention, some improvement and modification can also be carried out, these improvement and modification also fall into this
In invention scope of the claims.
Claims (8)
1. a kind of composite polycrystal-diamond, which is characterized in that be sintered by diamond dust, hard alloy and binding agent；
The diamond dust is prepared by following steps：
A it is) that the varigrained bortz powder of 10~20 parts by weight, the cetyl trimethylammonium bromide of 0.5~4 parts by weight is molten
Liquid, 20~40 parts by weight highly basic, the alcohols solvent of 150~300 parts by weight and 200~400 parts by weight water mixing after it is dry, obtain
To diamond dust.
2. composite polycrystal-diamond according to claim 1, which is characterized in that the size distribution of the diamond dust
It is 2~22 μm.
3. composite polycrystal-diamond according to claim 1, which is characterized in that the highly basic include sodium hydroxide and/
Or potassium hydroxide.
4. composite polycrystal-diamond according to claim 1, which is characterized in that the solvent is ethyl alcohol, methanol, second two
It is one or more in alcohol and butanol.
5. composite polycrystal-diamond according to claim 1, which is characterized in that the step A) be specially：
A1 after) being mixed bortz powder and strong base solution, the bortz powder of alkali process is obtained；
A2) bortz powder for the alkali process for obtaining above-mentioned steps, cetyl trimethylammonium bromide solution and solvent mix again
It is dry after conjunction, obtain diamond dust.
6. composite polycrystal-diamond according to claim 5, which is characterized in that the temperature of the mixing is 60~90
℃；The time of the mixing is 2~5 hours；
The temperature mixed again is 50~80 DEG C；The time mixed again is 4~7 hours.
7. composite polycrystal-diamond according to claim 5, which is characterized in that the step A1) after, further include by
The bortz powder of alkali process carries out being washed to neutrality, and dry；
The pH value of the neutrality is 6~8.
8. composite polycrystal-diamond according to claim 5, which is characterized in that the step A2) after, further include by
After diamond dust is washed with alcohols solvent, filter and dry.
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| CN102250582A (en) * | 2011-05-19 | 2011-11-23 | 北京保利世达科技有限公司 | Method for preparing submicron polycrystalline diamond abrasive with narrow particle size distribution |
| CN104085888A (en) * | 2014-07-17 | 2014-10-08 | 长沙矿冶研究院有限责任公司 | Method for preparing detonation nanometer diamond dispersion |
| CN104746054A (en) * | 2015-04-20 | 2015-07-01 | 南京航空航天大学 | Magnetic control based method for wet-process preparation of diamond magnetic abrasive |
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| CN102250582A (en) * | 2011-05-19 | 2011-11-23 | 北京保利世达科技有限公司 | Method for preparing submicron polycrystalline diamond abrasive with narrow particle size distribution |
| CN104085888A (en) * | 2014-07-17 | 2014-10-08 | 长沙矿冶研究院有限责任公司 | Method for preparing detonation nanometer diamond dispersion |
| CN104746054A (en) * | 2015-04-20 | 2015-07-01 | 南京航空航天大学 | Magnetic control based method for wet-process preparation of diamond magnetic abrasive |
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