CN111872375B - Preparation method of cobalt powder coated diamond pellet, cobalt powder coated diamond and application thereof - Google Patents
Preparation method of cobalt powder coated diamond pellet, cobalt powder coated diamond and application thereof Download PDFInfo
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- CN111872375B CN111872375B CN202010691629.0A CN202010691629A CN111872375B CN 111872375 B CN111872375 B CN 111872375B CN 202010691629 A CN202010691629 A CN 202010691629A CN 111872375 B CN111872375 B CN 111872375B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/17—Metallic particles coated with metal
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/12—Both compacting and sintering
- B22F3/14—Both compacting and sintering simultaneously
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
- B22F7/06—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools
- B22F7/08—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools with one or more parts not made from powder
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C26/00—Alloys containing diamond or cubic or wurtzitic boron nitride, fullerenes or carbon nanotubes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
- B22F2005/001—Cutting tools, earth boring or grinding tool other than table ware
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C26/00—Alloys containing diamond or cubic or wurtzitic boron nitride, fullerenes or carbon nanotubes
- C22C2026/006—Alloys containing diamond or cubic or wurtzitic boron nitride, fullerenes or carbon nanotubes with additional metal compounds being carbides
Abstract
The invention discloses a preparation method of a cobalt powder coated diamond pellet, a cobalt powder coated diamond and application thereof, wherein the preparation method comprises the following steps: a dispersant preparation step: adding acrylic resin, isopropanol and cobalt powder into a reactor, and fully and uniformly dispersing the acrylic resin, the isopropanol and the cobalt powder to obtain a cobalt powder dispersing agent; a wrapping step: and putting the diamond particles and the cobalt powder dispersing agent into a diamond wrapping machine, spraying the cobalt powder dispersing agent on the surfaces of the diamond particles by the diamond wrapping machine to form cobalt powder-coated diamond balls, and drying the cobalt powder-coated diamond balls. The invention has the following beneficial effects: the diamond particles are wrapped by the cobalt powder dispersing agent, then the cobalt powder coated diamond, the cobalt powder and the tungsten carbide powder are fully mixed, and the mixture is used as a raw material to manufacture the diamond impregnated cutting element, so that the cobalt powder coated diamond is uniformly distributed, and each area has a certain diamond volume ratio, and the wear performance of the whole diamond impregnated cutting element is uniformly distributed.
Description
Technical Field
The invention relates to the field of drilling and machining, in particular to a preparation method of a cobalt powder coated diamond ball, a cobalt powder coated diamond and application thereof.
Background
Hard and ultra-hard materials are commonly used in abrasive environments, many of which have important industrial applications, particularly in the fields of rock drilling, mining, oil and gas exploration and mining, and metal working and cutting applications. However, such applications require not only high stiffness, but often also a range of other important properties, such as: acceptable fracture toughness, corrosion resistance and high thermal conductivity. Composite structures offer some of the best and most widely used material solutions to these requirements. Over the past 60 to 70 years, it has been common to combine ultra-hard, wear resistant materials with a tough matrix, the most successful of these being cemented carbides in which the harder, more brittle phase is tungsten carbide and the tough matrix is cobalt.
With the ever expanding range of applications for diamond containing composite materials and diamond coating materials, particularly in high wear environments, diamond-tungsten metal (DTM) based drill bits have also become a subject of research for such materials, which may be applied in rock drilling for oil, gas and mineral extraction, etc. These DTM materials are composed of silicon carbide, tungsten carbide, cobalt and other metallic or ceramic components.
With the increasing world demand for fossil fuels, one major trend in oil drilling is toward deeper wellbores, as more recent surface reservoirs have been depleted. However, we will face two main problems: high downhole temperature and high formation compressive strength. The deeper the wellbore, the higher the well pressure, the higher the temperature and the higher the load the drill bit is subjected to. To some extent, hard formations are more often encountered. PDC serrations are too brittle for drilling hard rock. Thus, impregnated diamond bits (impreg bits) are in the field of view of the drilling industry.
The diamond impregnated cutting element is mainly formed by embedding diamond particles into the diamond impregnated cutting surface, is prepared by mixing tungsten carbide, cobalt powder and artificial diamond, and the diamond uniformly distributed in a metal matrix is beneficial to improving the retention and abrasion life of the diamond. If the diamond particles are unevenly distributed, diamond clusters and areas without diamond grit may appear in the matrix. The lack of base member can appear in the abundant region of diamond granule content, lead to the reduction of diamond granule retention rate, and the regional wearability performance that diamond granule content is few or does not contain diamond granule is relatively poor, lead to diamond impregnated bit performance distribution inequality, can lead to the PDC sawtooth finally in the use when compound piece in one side receives the harm, the opposite side is because the performance receives the influence, lead to the drill bit to become invalid, thereby influence drill bit life, also can promote cost of manufacture or use simultaneously.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a preparation method of a cobalt powder coated diamond pellet, a cobalt powder coated diamond and application thereof.
The purpose of the invention is realized by the following technical scheme:
a preparation method of a cobalt powder coated diamond pellet comprises the following steps:
s1, preparing a dispersing agent: sequentially adding acrylic resin and isopropanol into a reactor, heating the reactor to 100 ℃, and magnetically stirring until the reactor is transparent to prepare an isopropanol solution; adding cobalt powder with the particle size of 1-10 um into the reactor, adjusting the temperature of the reactor to 60 ℃, and stirring for 10-30 min to fully disperse the cobalt powder in an isopropanol solution to prepare a cobalt powder dispersing agent;
s2, wrapping: and putting the diamond particles and the cobalt powder dispersing agent into a diamond wrapping machine, spraying the cobalt powder dispersing agent on the surfaces of the diamond particles by the diamond wrapping machine to form cobalt powder-coated diamond balls, and drying the cobalt powder-coated diamond balls.
Preferably, the step S2 specifically includes the following steps:
s21, putting 40-50 mesh diamond particles into a glass container of the diamond wrapping machine, and setting the air pressure of the diamond wrapping machine to be 1.6-2.0 Mpa;
s22, conveying the cobalt powder dispersing agent into a spray gun in a diamond wrapping machine through a peristaltic pump, wherein the rotating speed of the peristaltic pump is 40-60 r/min, and the flow speed of the spray gun is adjusted to be 150cm3/min ~250cm3Min; spraying diamond particles in a glass container by using the spray gun for 10-15 min until a layer of cobalt powder is coated on the surfaces of the diamond particles to form cobalt powder coated diamond balls with the particle size of 35-45 meshes; in the spraying process, the glass container is kept at constant temperature and humidity, the temperature is kept at 25 ℃, and the humidity is kept at 30-40%;
s23, placing the diamond balls coated with the cobalt powder into a coating cylinder, and heating for 5-10 minutes at the temperature of 30-60 ℃;
s24, taking out the diamond balls coated by the cobalt powder and the residual waste powder, screening the waste powder and other small particles by using a molecular sieve of 30-40 meshes, and packaging the diamond balls coated by the residual cobalt powder for later use.
Preferably, the acrylic resin: isopropyl alcohol: cobalt powder: the weight ratio of the diamond particles is 8: 25-30: 10: 10.
a cobalt powder coated diamond is prepared by the preparation method.
The application of the cobalt powder coated diamond comprises the following steps:
a. mixing materials: putting the cobalt powder-coated diamond pellets, the cobalt powder and the tungsten carbide powder into a stainless steel mixing tank, and mixing for 10-60 min at the frequency of 80 oct/min to prepare a primary mixture;
b. drying: putting the preliminary mixture into a powder vacuum drying oven, and drying for 1-3 h at the temperature of 50-70 ℃ to prepare a dry mixture;
c. assembling: putting the dry mixture into a niobium cup, flattening, putting the hard alloy cleaned by absolute ethyl alcohol on the dry mixture, covering the upper end of the hard alloy with the niobium cup, compacting, and combining into a composite piece; placing the composite piece into a synthetic assembly block, placing the composite piece into a cubic press, heating to 300-500 ℃, keeping the temperature for 2min, and keeping the pressure at 3-5.5 GPa;
d. and sintering, continuously heating the cubic press, and synthesizing for 5-20 min under the conditions of the temperature of 700-1000 ℃ and the pressure of 3.5-5.5 GPa to form the diamond impregnated cutting element.
Preferably, the cobalt powder coated diamond: cobalt powder: the weight ratio of the tungsten carbide powder is 11-13:11-14: 36-44.
The invention has the following beneficial effects: in the mixing process, the cobalt powder dispersing agent wraps the diamond particles, so that the generation of diamond clusters or diamond accumulation caused by direct contact of the diamond particles and the diamond particles can be avoided; cobalt powder cladding diamond and cobalt powder and tungsten carbide powder intensive mixing, regard it as raw materials preparation diamond impregnated cutting element again, make cobalt powder cladding diamond distribute more evenly, no diamond cluster or the accumulational emergence of diamond, every region has certain diamond volume to account for the ratio, thereby cause whole diamond impregnated cutting element's wearability to distribute evenly, avoided because diamond impregnated drill bit performance distributes unevenly and leads to in the use in the composite piece in case one side drill bit that causes loses efficacy when receiving the harm, and influence drill bit life, the cost of manufacture or use cost has also been practiced thrift to the while.
Drawings
The technical scheme of the invention is further explained by combining the accompanying drawings as follows:
FIG. 1: a schematic of the structure of the uncoated diamond particles;
FIG. 2: a schematic structural diagram of a cobalt powder coated diamond pellet;
FIG. 3: the structure schematic diagram of a synthetic diamond impregnated cutting element formed by directly mixing three powder materials of diamond particles, tungsten carbide powder and cobalt powder in the prior art;
FIG. 4: the invention discloses a structural schematic diagram of a synthetic diamond impregnated cutting element formed by directly mixing three powder materials of cobalt powder coated diamond pellets, cobalt powder and tungsten carbide powder.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments shown in the drawings. These embodiments are not intended to limit the present invention, and structural, methodical, or functional changes that may be made by one of ordinary skill in the art in light of these embodiments are intended to be within the scope of the present invention.
The present invention will be described in detail with reference to examples.
As shown in fig. 1 to 2, the invention discloses a method for preparing cobalt powder coated diamond pellets, which comprises the following steps:
s1, preparing a dispersing agent: sequentially adding acrylic resin and isopropanol into a reactor, heating the reactor to 100 ℃, and magnetically stirring the reactor to be transparent to prepare an isopropanol solution; adding cobalt powder with the particle size of 1-10 um into the reactor, adjusting the temperature of the reactor to 60 ℃, and stirring for 10-30 min to fully disperse the cobalt powder in an isopropanol solution to prepare a cobalt powder dispersing agent;
s2, wrapping: and putting the diamond particles and the cobalt powder dispersing agent into a diamond wrapping machine, spraying the cobalt powder dispersing agent on the surfaces of the diamond particles by the diamond wrapping machine to form cobalt powder-coated diamond balls, and drying the cobalt powder-coated diamond balls.
The diamond particles are wrapped by the cobalt powder dispersing agent, so that the generation of diamond clusters or diamond accumulation caused by direct contact of the diamond particles and the diamond particles can be avoided, the overall performance of the cobalt powder coated diamond is improved, and the service life is prolonged.
In the above, specifically:
the step S1 specifically includes the following steps:
s11, sequentially adding acrylic resin and isopropanol into a reactor, heating the reactor to 100 ℃, and magnetically stirring until the mixture is transparent to obtain an isopropanol solution;
s12, adding cobalt powder with the particle size of 1-10 um into the reactor, adjusting the temperature of the reactor to 60 ℃, and stirring for 10-30 min to fully disperse the cobalt powder in an isopropanol solution to obtain the cobalt powder dispersing agent.
The step S2 specifically includes the following steps:
s21, putting 40-50 mesh diamond particles into a glass container of the diamond wrapping machine, opening an orifice plate of the diamond wrapping machine, setting air pressure to supply 1.6-2.0 Mpa, and then opening an exhaust port, a speed controller and an exhaust valve;
s22, conveying the cobalt powder dispersing agent into a spray gun in a diamond wrapping machine through a peristaltic pump, wherein the rotating speed of the peristaltic pump is 40-60 r/min, and the flow speed of the spray gun is adjusted to be 150cm 3/min-250 cm 3/min; and spraying the diamond particles in the glass container by the spray gun for 10-15 min until the surfaces of the diamond particles are coated with a layer of cobalt powder to form cobalt powder coated diamond balls with the particle size of 35-45 meshes. In the whole process, the environment of the glass container is constant temperature and humidity (namely outdoor temperature), the temperature is kept at 25 ℃, the humidity is kept at 30-40%, and the constant temperature and humidity are kept to ensure the wrapping quality so as to prevent the wrapping quality from being influenced by the external environment and protect a machine from being damaged. In addition, if the cobalt powder dispersing agent is adhered to the wall of the glass container in the spraying process, the temperature of the spray gun is increased or the flow rate of the spray gun is increased for adjustment, and the adjustment can be directly adjusted according to the requirement through a control button on a control panel.
S23, turning on a heater in the diamond wrapping machine, and putting the diamond balls wrapped with cobalt into a wrapping cylinder to be dried for 5-10 minutes at the temperature of 30-60 ℃;
s24, closing the peristaltic pump, closing the exhaust port, the speed controller and the exhaust valve, closing the diamond wrapping machine, taking out the diamond balls wrapped with the cobalt and the residual waste powder in the glass container, removing the waste powder and the rest small particles by using a molecular sieve of 30-40 meshes, and wrapping diamond with the residual cobalt powder for packaging for later use.
Further, the acrylic resin: isopropyl alcohol: cobalt powder: the weight ratio of the diamond particles is 8: 25-30: 10: 10. the proportion of isopropanol in the acrylic resin (BR 118) is determined by the solubility at a particular temperature. In the proportion, the acrylic resin is used as the binder, and for the cobalt powder dispersing agent, poor flowability caused by too high viscosity of the cobalt powder dispersing liquid or poor affinity of the dispersing liquid for diamond when coating diamond particles caused by insufficient binder or poor coating quality caused by too much binder or too little binder, and the cobalt coating layer is easy to fall off after drying. The weight ratio used in the present invention was tested several times to confirm it as the optimum solution.
The invention discloses a cobalt powder coated diamond, which is prepared by the preparation method of the cobalt powder coated diamond pellet.
As shown in FIG. 4, the present invention also discloses a method for preparing a diamond impregnated cutting element, comprising the steps of:
a. mixing materials: placing the cobalt powder-coated diamond pellets, the cobalt powder and the tungsten carbide powder of any one of claims 1 to 4 into a stainless steel mixing tank, and mixing the materials for 10min to 60min at a frequency of 80 oct/min to prepare a primary mixture;
b. drying: putting the preliminary mixture into a powder vacuum drying oven, and drying for 1-3 h at the temperature of 50-70 ℃ to prepare a dry mixture;
c. assembling: putting the dry mixture into a niobium cup, flattening, putting the hard alloy cleaned by absolute ethyl alcohol on the dry mixture, covering the upper end of the hard alloy with the niobium cup, compacting, and combining into a composite piece; placing the composite piece into a synthetic assembly block, placing the composite piece into a cubic press, heating to 300-500 ℃, keeping the temperature for 2min, and keeping the pressure at 3-5.5 GPa;
d. sintering, continuously heating by using a cubic press, and synthesizing for 5-20 min under the conditions of the temperature of 700-1000 ℃ and the pressure of 3.5-5.5 GPa to form the diamond impregnated cutting element.
Cobalt powder cladding diamond and cobalt powder and tungsten carbide powder intensive mixing, regard it as raw materials preparation diamond impregnated cutting element again, make cobalt powder cladding diamond distribute more evenly, no diamond cluster or the accumulational emergence of diamond, every region has certain diamond volume to account for the ratio, thereby cause whole diamond impregnated cutting element's wearability to distribute evenly, avoided because diamond impregnated drill bit performance distributes unevenly and leads to in the use in the composite piece in case one side drill bit that causes loses efficacy when receiving the harm, and influence drill bit life, the cost of manufacture or use cost has also been practiced thrift to the while.
It should be understood that although the present description refers to embodiments, not every embodiment contains only a single technical solution, and such description is for clarity only, and those skilled in the art should make the description as a whole, and the technical solutions in the embodiments can also be combined appropriately to form other embodiments understood by those skilled in the art.
The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.
Claims (5)
1. The preparation method of the diamond pellet coated with the cobalt powder is characterized by comprising the following steps of:
s1, preparing a dispersing agent: sequentially adding acrylic resin and isopropanol into a reactor, heating the reactor to 100 ℃, and magnetically stirring until the reactor is transparent to prepare an isopropanol solution; adding cobalt powder with the particle size of 1-10 um into the reactor, adjusting the temperature of the reactor to 60 ℃, and stirring for 10-30 min to fully disperse the cobalt powder in an isopropanol solution to prepare a cobalt powder dispersing agent;
s2, wrapping: putting diamond particles and the cobalt powder dispersing agent into a diamond wrapping machine, spraying the cobalt powder dispersing agent on the surfaces of the diamond particles by the diamond wrapping machine to form cobalt powder-coated diamond balls, and drying the cobalt powder-coated diamond balls; the acrylic resin: isopropyl alcohol: cobalt powder: the weight ratio of the diamond particles is 8: 25-30: 10: 10.
2. the method for preparing a cobalt powder coated diamond pellet as claimed in claim 1, wherein: the step S2 specifically includes the following steps:
s21, putting 40-50 mesh diamond particles into a glass container of the diamond wrapping machine, and setting the air pressure of the diamond wrapping machine to be 1.6-2.0 Mpa;
s22, conveying the cobalt powder dispersing agent into a spray gun in a diamond wrapping machine through a peristaltic pump, wherein the rotating speed of the peristaltic pump is 40-60 r/min, and the flow speed of the spray gun is adjusted to be 150cm3/min ~250cm3Min; spraying diamond particles in a glass container by using the spray gun for 10-15 min until a layer of cobalt powder is coated on the surfaces of the diamond particles to form cobalt powder coated diamond balls with the particle size of 35-45 meshes; in the spraying process, the glass container is kept at constant temperature and humidity, the temperature is kept at 25 ℃, and the humidity is kept at 30-40%;
s23, placing the diamond balls coated with the cobalt powder into a coating cylinder, and heating for 5-10 minutes at the temperature of 30-60 ℃;
and S24, taking out the diamond balls coated by the cobalt powder and the residual waste powder, screening the waste powder and other small particles by using a molecular sieve of 30-40 meshes, and packaging the residual diamond balls coated by the cobalt powder for later use.
3. Cobalt powder cladding diamond, its characterized in that: prepared by the preparation method of claim 1 or 2.
4. The application of the cobalt powder coated diamond is characterized by comprising the following steps:
a. mixing materials: putting the cobalt powder-coated diamond pellets, the cobalt powder and the tungsten carbide powder of any one of claims 1 to 3 into a stainless steel mixing tank, and mixing the materials for 10-60 min at a frequency of 80 oct/min to prepare a primary mixture;
b. drying: putting the preliminary mixture into a powder vacuum drying oven, and drying for 1-3 h at the temperature of 50-70 ℃ to prepare a dry mixture;
c. assembling: putting the dry mixture into a niobium cup, flattening, putting the hard alloy cleaned by absolute ethyl alcohol on the dry mixture, covering the upper end of the hard alloy with the niobium cup, compacting, and combining into a composite piece; placing the composite piece into a synthetic assembly block, placing the composite piece into a cubic press, heating to 300-500 ℃, keeping the temperature for 2min, and keeping the pressure at 3-5.5 GPa;
d. sintering, continuously heating by using a cubic press, and synthesizing for 5-20 min under the conditions of the temperature of 700-1000 ℃ and the pressure of 3.5-5.5 GPa to form the diamond impregnated cutting element.
5. Use of cobalt powder coated diamond according to claim 4, wherein: coating diamond with cobalt powder: cobalt powder: the weight ratio of the tungsten carbide powder is 11-13:11-14: 36-44.
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