CN105236401A - Diamond powder and preparation method thereof - Google Patents
Diamond powder and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a preparation method of diamond powder. The method comprises the following steps: mixing diamond dust, a hexadecyl trimethyl ammonium bromide solution, a strong alkaline solution and a solvent, and drying to obtain the diamond powder The preparation method of the diamond powder for polycrystalline diamond composite sheets concretely comprises the following steps: carrying out alkali treatment on the diamond dust and a specific concentration of the strong alkaline solution, and reacting the alkali treated diamond dust in an alcohol solution of hexadecyl trimethyl ammonium bromide to obtain the diamond powder which is modified diamond dust. The preparation method improves the uniformity of a mixture of diamond dusts with different granularities, realizes uniform granularity distribution and reduces the agglomeration phenomenon in the diamond dust mixing process, so the quality stability and the comprehensive performances of the polycrystalline diamond composite sheets are improved.
Description
Technical field
The invention belongs to ultra-hard material poly-crystal diamond compact production technical field, particularly relate to a kind of diamond powder and preparation method thereof.
Background technology
Superhard material mainly refers to diamond, and it is material the hardest in the world known at present, and its hardness is all far above the hardness of such as materials such as hard tool such as corundum, silicon carbide and cutter material Wimet, rapid steel.Therefore, superhard material is suitable for the instrument for manufacturing other material of processing, especially in processing rigid material, has unrivaled superiority, occupies irreplaceable critical role.Thus superhard material is industrially applied widely.But diamonds is rare, expensive, the needs of Economic development can not be met far away, therefore, researchist utilizes high-pressure synthesis technology to synthesize polycrystalline diamond (PCD), makes adamantine range of application expand to multiple fields such as exploration, Aeronautics and Astronautics, automobile, electronics, stone material.Along with the further expansion of applications of diamond, relative matrix material causes the broad interest of investigator, and polycrystalline diamond compacts (PDCs) is exactly one of them.
Polycrystalline diamond compacts (PDCs) is the super-hard compound material be composited under high pressure high temperature sintering condition by many fine-particle diamonds and cement carbide substrate at high temperature under high pressure, structure due to polycrystalline diamond is the fine-particle diamond sintered compact that orientation differs, though its hardness and wear resistance are lower than single-crystal diamond, but sintered compact shows as isotropy, therefore can not split along single cleavage surface as natural diamond, often be mainly used in oil as machining tool, metallurgical, geological drill bit, hole enlarger etc., there is thermal conductivity good, impelling strength is high, wear resistance is good, hardness is high, and the feature that self-sharpening is good, particularly there is high toughness, its drill speed and timeliness are the manyfold of natural diamond, and effectively can also keep aperture in drilling process.Can also be used to cut non-ferrous metal and alloy, Wimet and non-metallic material, cutting speed is the hundreds of times of inserted tool, and durability is thousands of times of Wimet simultaneously.Thus petroleum drilling is widely used in, the field of machining such as the precision of geological prospecting and matrix material and the continuous or interrupted cut processing of half precision.In addition, along with the development of science and technology, it also becomes the important material of the high-tech area such as space flight, communication.
Along with the widespread use of polycrystalline diamond compacts (PDCs) in every field, every profession and trade it is also proposed higher requirement to the stability of its quality and performance.Then in prior art, the synthesis of polycrystalline diamond compacts (PDCs) generally adopts the diadust of different-grain diameter size and a small amount of binding agent, forms with Wimet combined sintering, but the polycrystalline diamond compacts (PDCs) quality of synthesis is inconsistent, over-all properties is unstable, and composite sheet service efficiency is not high.
Thus, how can find a kind of better preparation method, make polycrystalline diamond compacts (PDCs) have over-all properties compared with stable quality and Geng Gao, be one of manufacturer's problem demanding prompt solution in field always.
Summary of the invention
In view of this, the technical problem to be solved in the present invention is to provide a kind of diamond powder and preparation method thereof, diamond powder provided by the invention, improve the mixture homogeneity of diamond powder, even particle size distribution, reduce the agglomeration in diamond powder mixing process, and then improve polycrystalline diamond compacts (PDCs) quality stability and over-all properties.
The invention discloses a kind of diamond powder for polycrystalline diamond compacts (PDCs), it is characterized in that, prepared by following raw material:
Preferably, the size-grade distribution of described diamond powder is 2 ~ 22 μm.
Preferably, described highly basic comprises sodium hydroxide and/or potassium hydroxide.
Preferably, described solvent is one or more in ethanol, methyl alcohol, ethylene glycol and acetone.
The invention provides a kind of preparation method of diamond powder, it is characterized in that, comprise the following steps:
A) by dry after bortz powder, cetyl trimethylammonium bromide solution, strong base solution and solvent, diamond powder is obtained.
Preferably, described steps A) be specially:
A1), after bortz powder and strong base solution being mixed, the bortz powder of alkaline purification is obtained;
The bortz powder of the alkaline purification A2) above-mentioned steps obtained, cetyl trimethylammonium bromide solution and solvent mix rear drying again, obtain diamond powder.
Preferably, the temperature of described mixing is 60 ~ 90 DEG C; The time of described mixing is 2 ~ 5 hours;
The described temperature again mixed is 50 ~ 80 DEG C; The described time again mixed is 4 ~ 7 hours.
Preferably, described steps A 1) after, also comprise and the bortz powder of alkaline purification is carried out being washed to neutrality, and dry;
The pH value of described neutrality is 6 ~ 8.
Preferably, described steps A 2) after, also comprise after being washed by diamond powder alcoholic solvent, suction filtration is also dry.
The invention also discloses one for polycrystalline diamond compacts (PDCs), it is characterized in that, sintered by the diamond powder described in above-mentioned any one technical scheme or diamond powder, Wimet and the binding agent prepared by above-mentioned any one technical scheme and form.
The invention discloses a kind of diamond powder for polycrystalline diamond compacts (PDCs), prepared by following raw material: the bortz powder of 10 ~ 20 weight parts, the cetyl trimethylammonium bromide of 0.5 ~ 4 weight part, the highly basic of 20 ~ 40 weight parts, the solvent of 150 ~ 300 weight parts and the water of 200 ~ 400 weight parts.Compared with prior art, diamond powder for polycrystalline diamond compacts (PDCs) provided by the invention and preparation method thereof, improve the uniformity coefficient during mixing of varigrained bortz powder, even particle size distribution, reduce the agglomeration in bortz powder mixing process, and then improve polycrystalline diamond compacts (PDCs) quality stability and over-all properties.Overcome in prior art in polycrystalline diamond compacts (PDCs) preparation process, because varigrained bortz powder mixing is uneven, and then the problem that composite sheet quality conformance is poor, over-all properties is unstable and service efficiency is not high caused.Diamond powder good dispersity prepared by the present invention, even particle size distribution, as the micro mist of synthesis polycrystalline diamond compacts (PDCs) in batch mixing process can well and binding agent disperse mix uniformly, avoid because bortz powder particle diameter is little, surface energy large, the phenomenon of easily reuniting together when batch mixing.Thus improve polycrystalline diamond compacts (PDCs) shock resistance, wear resistance to a certain extent, make the over-all properties of the polycrystalline diamond compacts (PDCs) of synthesis comparatively stable.Experimental result shows, the size-grade distribution interval of the diamond powder for polycrystalline diamond compacts (PDCs) prepared by the present invention brings up to 2 ~ 22 μm by original 2 ~ 35 μm.
Accompanying drawing explanation
Fig. 1 is the particle size distribution figure of the undressed diamond powder of the present invention;
Fig. 2 is the particle size distribution figure of diamond powder prepared by the embodiment of the present invention 1;
Fig. 3 is the particle size distribution figure of diamond powder prepared by the embodiment of the present invention 2;
Fig. 4 is the particle size distribution figure of diamond powder prepared by the embodiment of the present invention 3.
Embodiment
In order to understand the present invention further, below in conjunction with embodiment, the preferred embodiments of the invention are described, but should be appreciated that these describe just as further illustrating the features and advantages of the present invention instead of the restriction to patent requirements of the present invention.
The all raw materials of the present invention, be not particularly limited its source, commercially buy or prepare according to ordinary method well known to those skilled in the art.
The all raw materials of the present invention, be not particularly limited its purity, the present invention preferably adopts analytical pure.
Diamond powder of the present invention, i.e. a kind of modification diamond powder for polycrystalline diamond compacts (PDCs).
The invention discloses a kind of diamond powder for polycrystalline diamond compacts (PDCs), it is characterized in that, prepared by following raw material:
In the raw material of the diamond powder for polycrystalline diamond compacts (PDCs) of the present invention, the add-on of described bortz powder is preferably 10 ~ 20 weight parts, is more preferably 11 ~ 19 weight parts, most preferably is 13 ~ 17 weight parts; When described bortz powder is preferably for polycrystalline diamond compacts (PDCs), the admixed finepowder of multiple varigrained diadust, the size range of the present invention to described bortz powder is not particularly limited, according to the difference of the polycrystalline diamond compacts (PDCs) of preparation, the size range of bortz powder is also thereupon different; The size-grade distribution of bortz powder of the present invention can be 1 ~ 40 μm usually, also can be 1.5 ~ 38 μm, also can be 1.8 ~ 35 μm, also can be 2 ~ 35 μm or 2 ~ 30 μm; The size-grade distribution of described diamond powder can accomplish 1 ~ 25 μm, more can accomplish 1.5 ~ 24 μm, more can accomplish 1.8 ~ 23 μm or 2 ~ 22 μm; The present invention's other conditions to bortz powder are not particularly limited, with the bortz powder for the preparation of polycrystalline diamond compacts (PDCs) well known to those skilled in the art.
The add-on of cetyl trimethylammonium bromide of the present invention is preferably 1 ~ 2 weight part, is more preferably 1.1 ~ 1.9 weight parts, is more preferably 1.3 ~ 1.7 weight parts, most preferably is 1.4 ~ 1.6 weight parts; The add-on of described highly basic is preferably 20 ~ 40 weight parts, is more preferably 22 ~ 38 weight parts, is more preferably 25 ~ 35 weight parts, most preferably is 27 ~ 32 weight parts; Described highly basic is preferably sodium hydroxide and/or potassium hydroxide, is more preferably sodium hydroxide or potassium hydroxide, most preferably is sodium hydroxide; The add-on of described solvent is preferably 150 ~ 300 weight parts, is more preferably 170 ~ 280 weight parts, is more preferably 190 ~ 260 weight parts, most preferably is 200 ~ 250 weight parts; Described solvent is preferably alcoholic solvent, is more preferably one or more in ethanol, methyl alcohol, ethylene glycol and acetone, is more preferably ethanol, methyl alcohol, ethylene glycol or butanols, most preferably is ethanol; The add-on of described water is preferably 200 ~ 400 weight parts, is more preferably 220 ~ 380 weight parts, is more preferably 250 ~ 350 weight parts, most preferably is 280 ~ 320 weight parts; Described water is preferably deionized water.The present invention does not have other to limit especially to above-mentioned raw materials, with the requirement of above-mentioned raw materials well known to those skilled in the art in usual application process.
The present invention has prepared the diamond powder for polycrystalline diamond compacts (PDCs) by following raw material, i.e. a kind of modification diadust, effectively solve varigrained bortz powder in batch mixing process, because the particle size of micro mist is little, surface energy is large, and the interparticle reactive force of homogeneity is mainly magnetism, cause in batch mixing process, easily cause the phenomenon of reuniting together between particle.Thus causing the polycrystalline diamond compacts (PDCs) quality of synthesis inconsistent, over-all properties is unstable, the problems such as composite sheet service efficiency is not high.
The invention provides a kind of preparation method of diamond powder, it is characterized in that, comprise the following steps:
A) by dry after bortz powder, cetyl trimethylammonium bromide solution, strong base solution and solvent, diamond powder is obtained.Described solvent is preferably alcoholic solvent.
In the above-mentioned preparation method of the present invention, raw materials used optimum principle and add-on and the optimum principle in aforementioned raw materials and add-on all consistent, this is no longer going to repeat them.The concentration of the present invention to described cetyl trimethylammonium bromide solution is not particularly limited, for improving the dispersing property of diamond powder, size-grade distribution evenly, the mass concentration of the preferred cetyl trimethylammonium bromide solution of the present invention is 0.01 ~ 0.1g/mL, be more preferably 0.02 ~ 0.08g/mL, most preferably be 0.03 ~ 0.06g/mL; The concentration of the present invention to described strong base solution is not particularly limited, for improving the dispersing property of diamond powder, size-grade distribution evenly, the mass concentration of the preferred strong base solution of the present invention is 0.001 ~ 0.01mol/mL, be more preferably 0.002 ~ 0.008mol/mL, most preferably be 0.02 ~ 0.006mol/ml.
The present invention is for better to overcome the interparticle reactive force of homogeneity, reduce agglomeration, increase particle size distribution, by described steps A) specifically carry out according to the following steps, A1), after bortz powder and strong base solution being mixed, the bortz powder of alkaline purification is obtained; The bortz powder of the alkaline purification A2) above-mentioned steps obtained, cetyl trimethylammonium bromide solution and solvent mix rear drying again, obtain diamond powder.
The present invention obtains the bortz powder of alkaline purification after first bortz powder and the strong base solution prepared being mixed; The temperature of described mixing is preferably 60 ~ 90 DEG C, is more preferably 65 ~ 85 DEG C, most preferably is 70 ~ 80 DEG C; The time of described mixing is preferably 2 ~ 5 hours, is more preferably 2.5 ~ 4.5 hours, most preferably is 3 ~ 4 hours; The present invention is not particularly limited the mode of described preparation and condition, with manner of formulation well known to those skilled in the art and condition; The mode of the present invention to described mixing is not particularly limited, and with hybrid mode well known to those skilled in the art, the present invention is preferably uniformly mixed.
First the present invention carries out alkaline purification to varigrained bortz powder, the bortz powder surface hydroxylation made, and then make follow-up cetyl trimethylammonium bromide solution better carry out modification to bortz powder at alcohol system environment, thus the polycrystalline diamond compacts (PDCs) diamond powder that better prepared sizes are evenly distributed.
The present invention improves follow-up modified effect, makes bortz powder better carry out modification at alcohol system environment, preferably is above-mentionedly carried out being washed to neutrality by the bortz powder of alkaline purification, and dry.The present invention is not particularly limited described washing, and with water-washing method well known to those skilled in the art, the present invention preferably washes with deionized water.The present invention is not particularly limited described neutrality, and with the definition of neutrality well known to those skilled in the art, the pH value of neutrality of the present invention is preferably 6 ~ 8, is more preferably 6.5 ~ 7.5, most preferably is 7.The present invention is not particularly limited the mode of described drying and condition, and with drying mode well known to those skilled in the art and condition, the present invention is preferably suction filtration drying.
The bortz powder of the alkaline purification that above-mentioned steps obtains by the present invention, ethanol and the cetyl trimethylammonium bromide solution prepared mix rear drying again, obtain diamond powder.The described temperature again mixed is preferably 50 ~ 80 DEG C, is more preferably 55 ~ 75 DEG C, most preferably is 60 ~ 70 DEG C; The described time again mixed is preferably 4 ~ 7 hours, is more preferably 4.5 ~ 6.5 hours, most preferably is 5 ~ 6 hours.The present invention is not particularly limited the described mode again mixed, and with hybrid mode well known to those skilled in the art, the present invention is preferably uniformly mixed.
The process for preparation of the present invention to the described cetyl trimethylammonium bromide solution (CTAB diluent) prepared is not particularly limited, with the process for preparation of CTAB diluent well known to those skilled in the art, the present invention is preferably CTAB and deionized water ultrasonic disperse 30 ~ 40min in ultrasonic cleaning instrument, 1.5 ~ 2.5h is hydrolyzed again, obtained CTAB diluent under room temperature (20 ~ 30 DEG C).
The present invention, for promote modified effect further, after preferably being washed with alcoholic solvent by diamond powder, after suction filtration carries out drying again, obtains diamond powder.The present invention is not particularly limited described alcoholic solvent, with the alcoholic solvent for washing well known to those skilled in the art, the present invention be preferably in ethanol, methyl alcohol, ethylene glycol and butanols one or more, be more preferably ethanol, methyl alcohol, ethylene glycol or butanols, most preferably be ethanol.The present invention is not particularly limited the mode of described suction filtration and condition, and with suction filtration mode well known to those skilled in the art and condition, the present invention is preferably vacuum filtration; The present invention is not particularly limited the mode of described drying and condition, with drying mode well known to those skilled in the art and condition, the present invention is preferably loft drier drying, and drying temperature is preferably 80 ~ 100 DEG C, be more preferably 85 ~ 95 DEG C, most preferably be 87 ~ 92 DEG C; Described time of drying is preferably 5 ~ 10 hours, is more preferably 6 ~ 9 hours, most preferably is 7 ~ 8 hours.
The present invention adopts alcoholic solvent to be solvent, for constructing an alcohol system environment during CTAB diluent modification diamond.Make the bortz powder of surface hydroxylation, in anhydrous alcohol system environment, better carry out modification, obtained dispersed better diadust.Carry out modification by aforesaid method, make diamond powder form the particle with electric double layer structure, because electrostatic double layer electrostatic force perseverance is repulsion, prevent interparticle reunion; And modified micro mist surface can form layer protecting film and produces sterically hindered, interparticle magnetism can be weakened to a great extent, thus make when powder particle is close to each other, the interparticle reunion of effective suppression.Experimental result shows, the size-grade distribution of the diamond powder for polycrystalline diamond compacts (PDCs) prepared by the present invention brings up to 2 ~ 22 μm by original 2 ~ 35 μm.
The invention also discloses a kind of for polycrystalline diamond compacts (PDCs), sintered by the diamond powder described in above-mentioned any one technical scheme or diamond powder, Wimet and the binding agent prepared by above-mentioned any one technical scheme and form.
The present invention is not particularly limited described Wimet, with the Wimet for polycrystalline diamond compacts (PDCs) well known to those skilled in the art; The present invention is not particularly limited described binding agent, with the binding agent for polycrystalline diamond compacts (PDCs) well known to those skilled in the art; The technological process of the present invention to described sintering is not particularly limited, with the technological process for polycrystalline diamond compacts (PDCs) sintering well known to those skilled in the art.
The diamond powder that the present invention obtains through above-mentioned steps is in the batch mixing process of synthesis polycrystalline diamond compacts (PDCs), can preferably and binding agent disperse mix uniformly, avoid because varigrained diadust is in batch mixing process, micro powder granule size is little, surface energy is large, and the interparticle reactive force of homogeneity is mainly magnetism, cause in batch mixing process, easily cause the problem of reuniting together between particle.Thus, modification diamond powder prepared by the present invention as synthesis polycrystalline diamond compacts (PDCs) raw material time, the composite sheet quality conformance of synthesis is good, and over-all properties is stablized, and the service efficiency of product is higher.Experimental result shows, the polycrystalline diamond compacts (PDCs) of the diamond powder sintering adopting the present invention to prepare, and the impact energy of bearing is 600 ~ 1500J, and area wear resistance ratio is 3,100,000 ~ 3,650,000; And adopting the polycrystalline diamond compacts (PDCs) that the diamond powder of non-modified sinters, its impact energy of bearing is 450 ~ 1000, and area wear resistance ratio is 2,600,000 ~ 3,000,000, compares maximumly to improve 50% and 21%.
In order to understand the present invention further, be described diamond powder provided by the invention and preparation method thereof below in conjunction with embodiment, protection scope of the present invention is not limited by the following examples.
Embodiment 1
First the NaOH pressed powder getting 20g, in beaker, adds 100ml deionized water dissolving to it, and uses glass stick continuously stirring, until solution clarification.Carefully be injected in the volumetric flask of 250ml specification with glass stick by the NaOH solution of dissolving clarification, obtained substance withdrawl syndrome is the NaOH solution of 0.002mol/ml.
Varigrained diadust is joined in the beaker of the NaOH solution filling above-mentioned preparation, wherein diadust and NaOH mass ratio are 1:2, beaker to be placed on magnetic stirring apparatus constant temperature stirring reaction 3h at 80 DEG C, reaction terminates rear deionized water repetitive scrubbing to neutral, suction filtration is dry, obtain the bortz powder after alkaline purification, load reagent bottle for subsequent use.
By CTAB in beaker, add 100ml deionized water, ultrasonic disperse 30min in ultrasonic cleaning instrument, left at room temperature hydrolysis 2h, obtained mass concentration is the CTAB diluent of 0.03g/ml.
Bortz powder after above-mentioned alkaline purification is put into beaker, adds above-mentioned CTAB diluent to it, make CTAB account for the 1wt% of bortz powder, add 200ml dehydrated alcohol simultaneously, be placed in by beaker on magnetic stirring apparatus in beaker, at 70 DEG C, constant temperature stirs 5h.After reaction terminates, cleaner with absolute ethanol washing, after vacuum filtration, in loft drier at 80 DEG C dry 8h, the obtained diamond powder through CTAB modification.
Carry out size-grade distribution detection to diamond powder prepared by above-described embodiment 1, size-grade distribution is the particle size distribution figure of diamond powder prepared by the embodiment of the present invention 1 see Fig. 1, Fig. 1; It is the particle size distribution figure of the diamond powder of non-modified see Fig. 2, Fig. 2.Contrasted from Fig. 1 and Fig. 2, the size-grade distribution of unmodified diadust is 2.41 ~ 30.75 μm, size-grade distribution D10=2.41 μm, D50=12.78 μm, D90=30.75 μm; The size-grade distribution interval of diamond powder prepared by the embodiment of the present invention 1 is 1.85 ~ 20.14 μm, size-grade distribution D10=1.85 μm, D50=10.12 μm, D90=20.14 μm; It can thus be appreciated that the size-grade distribution of modification diadust prepared by the present invention is comparatively even, and substantially in normal distribution, and the obviously wide in range distribution in multimodal of unmodified diadust distributed area, and have macrobead to exist.
The polycrystalline diamond compacts (PDCs) that the modification diadust prepared above-described embodiment 1, Wimet and binding agent synthesize jointly carries out Performance Detection, and its impact energy of bearing is 1400J, and area wear resistance ratio is 3,600,000.
Embodiment 2
First the NaOH pressed powder getting 25g, in beaker, adds 150ml deionized water dissolving to it, and uses glass stick continuously stirring, until solution clarification.Carefully be injected in the volumetric flask of 250ml specification with glass stick by the NaOH solution of dissolving clarification, obtained substance withdrawl syndrome is the NaOH solution of 0.0025mol/ml.
Varigrained diadust is joined in the beaker of the NaOH solution filling above-mentioned preparation, wherein diadust and NaOH mass ratio are 1:2, beaker to be placed on magnetic stirring apparatus constant temperature stirring reaction 3h at 80 DEG C, reaction terminates rear deionized water repetitive scrubbing to neutral, suction filtration is dry, obtain the bortz powder after alkaline purification, load reagent bottle for subsequent use.
By CTAB in beaker, add 100ml deionized water, ultrasonic disperse 30min in ultrasonic cleaning instrument, left at room temperature hydrolysis 2h, obtained mass concentration is the CTAB diluent of 0.03g/ml.
Bortz powder after above-mentioned alkaline purification is put into beaker, adds above-mentioned CTAB diluent to it, make CTAB account for the 2wt% of bortz powder, add 250ml dehydrated alcohol simultaneously, be placed in by beaker on magnetic stirring apparatus in beaker, at 65 DEG C, constant temperature stirs 5h.After reaction terminates, cleaner with absolute ethanol washing, after vacuum filtration, in loft drier at 80 DEG C dry 8h, the obtained diamond powder through CTAB modification.
Carry out size-grade distribution detection to diamond powder prepared by above-described embodiment 2, size-grade distribution is the particle size distribution figure of diamond powder prepared by the embodiment of the present invention 2 see Fig. 3, Fig. 3.As shown in Figure 3, the size-grade distribution of diamond powder prepared by the embodiment of the present invention 2 is 2.23 ~ 21.45 μm, size-grade distribution D10=2.23 μm, D50=10.52 μm, D90=21.45 μm; It can thus be appreciated that the size-grade distribution of modification diadust prepared by the present invention is comparatively even, and substantially in normal distribution.
The polycrystalline diamond compacts (PDCs) that the modification diadust prepared above-described embodiment 2, Wimet and binding agent synthesize jointly carries out Performance Detection, and its impact energy of bearing is 1200J, and area wear resistance ratio is 3,450,000.
Embodiment 3
First the NaOH pressed powder getting 30g, in beaker, adds 200ml deionized water dissolving to it, and uses glass stick continuously stirring, until solution clarification.Carefully be injected in the volumetric flask of 250ml specification with glass stick by the NaOH solution of dissolving clarification, obtained substance withdrawl syndrome is the NaOH solution of 0.003mol/ml.
Varigrained diadust is joined in the beaker of the NaOH solution filling above-mentioned preparation, wherein diadust and NaOH mass ratio are 1:2, beaker to be placed on magnetic stirring apparatus constant temperature stirring reaction 3h at 80 DEG C, reaction terminates rear deionized water repetitive scrubbing to neutral, suction filtration is dry, obtain the bortz powder after alkaline purification, load reagent bottle for subsequent use.
By CTAB in beaker, add 100ml deionized water, ultrasonic disperse 30min in ultrasonic cleaning instrument, left at room temperature hydrolysis 2h, obtained mass concentration is the CTAB diluent of 0.03g/ml.
Bortz powder after above-mentioned alkaline purification is put into beaker, adds above-mentioned CTAB diluent to it, make CTAB account for the 1wt% of bortz powder, add 300ml dehydrated alcohol simultaneously, be placed in by beaker on magnetic stirring apparatus in beaker, at 70 DEG C, constant temperature stirs 6h.After reaction terminates, cleaner with absolute ethanol washing, after vacuum filtration, in loft drier at 80 DEG C dry 8h, the obtained diamond powder through CTAB modification.
Carry out size-grade distribution detection to diamond powder prepared by above-described embodiment 3, size-grade distribution is the particle size distribution figure of diamond powder prepared by the embodiment of the present invention 3 see Fig. 4, Fig. 4.As shown in Figure 4, the size-grade distribution of diamond powder prepared by the embodiment of the present invention 3 is 2.36 ~ 21.67 μm, size-grade distribution D10=2.36 μm, D50=10.80 μm, D90=21.67 μm; It can thus be appreciated that the size-grade distribution of modification diadust prepared by the present invention is comparatively even, and substantially in normal distribution.
The polycrystalline diamond compacts (PDCs) that the modification diadust prepared above-described embodiment 3, Wimet and binding agent synthesize jointly carries out Performance Detection, and its impact energy of bearing is 1000J, and area wear resistance ratio is 3,250,000.
Above a kind of diamond powder provided by the present invention and preparation method thereof is described in detail.Apply a concrete example herein to set forth principle of the present invention and embodiment, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping.It should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, can also carry out some improvement and modification to the present invention, these improve and modify and also fall in the protection domain of the claims in the present invention.
Claims (10)
1. for a diamond powder for polycrystalline diamond compacts (PDCs), it is characterized in that, prepared by following raw material:
2. diamond powder according to claim 1, is characterized in that, the size-grade distribution of described diamond powder is 2 ~ 22 μm.
3. diamond powder according to claim 1, is characterized in that, described highly basic comprises sodium hydroxide and/or potassium hydroxide.
4. diamond powder according to claim 1, is characterized in that, described solvent is one or more in ethanol, methyl alcohol, ethylene glycol and butanols.
5. a preparation method for diamond powder, is characterized in that, comprises the following steps:
A) by dry after bortz powder, cetyl trimethylammonium bromide solution, strong base solution and solvent, diamond powder is obtained.
6. preparation method according to claim 5, is characterized in that, described steps A) be specially:
A1), after bortz powder and strong base solution being mixed, the bortz powder of alkaline purification is obtained;
The bortz powder of the alkaline purification A2) above-mentioned steps obtained, cetyl trimethylammonium bromide solution and solvent mix rear drying again, obtain diamond powder.
7. preparation method according to claim 6, is characterized in that, the temperature of described mixing is 60 ~ 90 DEG C; The time of described mixing is 2 ~ 5 hours;
The described temperature again mixed is 50 ~ 80 DEG C; The described time again mixed is 4 ~ 7 hours.
8. preparation method according to claim 6, is characterized in that, described steps A 1) after, also comprise and the bortz powder of alkaline purification is carried out being washed to neutrality, and dry;
The pH value of described neutrality is 6 ~ 8.
9. preparation method according to claim 6, is characterized in that, described steps A 2) after, also comprise after being washed by diamond powder alcoholic solvent, suction filtration is also dry.
10. for a polycrystalline diamond compacts (PDCs), it is characterized in that, sintered by the diamond powder described in Claims 1 to 4 any one or diamond powder, Wimet and the binding agent prepared by claim 5 ~ 9 any one and form.
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| CN113462294A (en) * | 2021-06-29 | 2021-10-01 | 南京青锐风新材料科技有限公司 | Oily polycrystalline diamond grinding and polishing solution and production and preparation process thereof |
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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 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113462294A (en) * | 2021-06-29 | 2021-10-01 | 南京青锐风新材料科技有限公司 | Oily polycrystalline diamond grinding and polishing solution and production and preparation process thereof |
| CN113462294B (en) * | 2021-06-29 | 2023-06-27 | 南京青锐风新材料科技有限公司 | Oily polycrystalline diamond grinding and polishing liquid and production and preparation process thereof |
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