CN111852344A - Polycrystalline diamond compact and preparation method thereof - Google Patents
Polycrystalline diamond compact and preparation method thereof Download PDFInfo
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- CN111852344A CN111852344A CN202010678393.7A CN202010678393A CN111852344A CN 111852344 A CN111852344 A CN 111852344A CN 202010678393 A CN202010678393 A CN 202010678393A CN 111852344 A CN111852344 A CN 111852344A
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- 229910003460 diamond Inorganic materials 0.000 title claims abstract description 156
- 239000010432 diamond Substances 0.000 title claims abstract description 156
- 238000002360 preparation method Methods 0.000 title claims abstract description 23
- 238000003825 pressing Methods 0.000 claims abstract description 50
- 239000000843 powder Substances 0.000 claims abstract description 38
- 229910052751 metal Inorganic materials 0.000 claims abstract description 24
- 239000002184 metal Substances 0.000 claims abstract description 24
- 238000004519 manufacturing process Methods 0.000 claims abstract description 13
- 230000007704 transition Effects 0.000 claims description 59
- 239000000956 alloy Substances 0.000 claims description 31
- 229910045601 alloy Inorganic materials 0.000 claims description 31
- 239000011159 matrix material Substances 0.000 claims description 19
- 238000005245 sintering Methods 0.000 claims description 18
- 239000000463 material Substances 0.000 claims description 13
- 239000000758 substrate Substances 0.000 claims description 13
- 229910052903 pyrophyllite Inorganic materials 0.000 claims description 4
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 4
- 230000006835 compression Effects 0.000 claims description 2
- 238000007906 compression Methods 0.000 claims description 2
- 238000000465 moulding Methods 0.000 claims 1
- 239000002131 composite material Substances 0.000 description 18
- 238000012360 testing method Methods 0.000 description 15
- 230000000694 effects Effects 0.000 description 5
- 238000000227 grinding Methods 0.000 description 5
- 239000010438 granite Substances 0.000 description 4
- 235000019580 granularity Nutrition 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000010998 test method Methods 0.000 description 4
- 229910017052 cobalt Inorganic materials 0.000 description 3
- 239000010941 cobalt Substances 0.000 description 3
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 238000005056 compaction Methods 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 239000003209 petroleum derivative Substances 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 239000003079 shale oil Substances 0.000 description 2
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000011179 visual inspection Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/46—Drill bits characterised by wear resisting parts, e.g. diamond inserts
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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
- B22F7/062—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 involving the connection or repairing of preformed parts
- B22F7/064—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 involving the connection or repairing of preformed parts using an intermediate powder layer
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- General Life Sciences & Earth Sciences (AREA)
- Fluid Mechanics (AREA)
- Environmental & Geological Engineering (AREA)
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- Geochemistry & Mineralogy (AREA)
- Chemical & Material Sciences (AREA)
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- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Powder Metallurgy (AREA)
- Polishing Bodies And Polishing Tools (AREA)
Abstract
The invention provides a polycrystalline diamond compact and a preparation method thereof, the preparation method of the polycrystalline diamond compact comprises a prepressing forming step, the prepressing forming step comprises the steps of placing diamond micro powder in a metal round cup, the diamond micro powder in the metal round cup is pre-pressed by the pressing block, the diamond micro powder forms a working layer pre-forming body, an outer chamfer is arranged on the pressing end of the pressing block along the circumferential direction of the pressing block, the pressure head with the outer chamfer is used for prepressing the diamond micro powder in the metal round cup, the formed working layer preformed body is provided with a bulge corresponding to the position of the outer chamfer, the quantity of the micro powder at the edge of the diamond compact is increased, the density at the edge is improved, meanwhile, the working area of the diamond compact is increased, and the thickness of each part of the preformed body of the working layer is uniform, so that the production stability and the overall performance of the diamond compact are improved.
Description
Technical Field
The invention relates to the field of superhard composite materials, in particular to a polycrystalline diamond compact and a preparation method thereof.
Background
The diamond compact bit (PDC bit) has wide application in the aspect of drilling of petroleum and natural gas, along with the gradual reduction of conventional petroleum and natural gas exploitation resources, the rapid development of shale oil and shale gas is a great trend in the future, and shale oil and other difficultly-exploited land has higher and higher requirements on the performance of the PDC bit.
The diamond composite sheet is formed by sintering diamond micro powder and a hard alloy substrate (a hard alloy layer) together at high temperature and high pressure, and the diamond micro powder is sintered into a polycrystalline diamond layer, so that the composite sheet has ultrahigh hardness and wear resistance of diamond, and the hard alloy substrate has weldability and is convenient to apply to various different working environments.
In the existing preparation method of the diamond compact, a cobalt diffusion catalytic sintering method is adopted, in the process of sintering diamond micro powder together at high temperature and high pressure, cobalt in a hard alloy matrix is melted at high temperature and diffuses from the hard alloy matrix to the whole diamond micro powder layer at high pressure, diamond grains can grow and be sintered together at the contact part to form a D-D bond (diamond-diamond bond), and meanwhile, part of diamond is dissolved by the cobalt and then separated out again to form the D-D bond.
In the existing preparation method of the diamond compact, usually, diamond micro powder is placed in a metal round cup, the diamond micro powder in the metal round cup is flattened, then a hard matrix is placed in the metal round cup, the metal round cup is placed in a pyrophyllite block, the pyrophyllite block is placed in high-temperature high-pressure equipment, and the diamond micro powder and the hard matrix are sintered at high temperature and high pressure for one time. According to the preparation method, the diamond micro powder and the hard matrix are simultaneously pressurized and sintered once to form the diamond composite sheet, and then the cutting edge on the special-shaped diamond composite sheet is processed.
However, the diamond compact obtained by the preparation method has poor wear resistance and impact resistance, and referring to fig. 1, the thickness of each part on the polycrystalline layer 1 on the diamond compact is uneven by the preparation method, so that the density of each part on the polycrystalline layer 1 is different. Referring to fig. 2, the boundary between the polycrystalline layer 1 and the transition layer 2 is a non-smooth curve, and the thickness of the transition layer varies.
The impact resistance test method comprises the following steps of carrying out impact resistance test on diamond composite sheets of the same type and carrying out ground area test on four different positions on the same composite sheet: and (3) putting different diamond compacts into an impact resistance device, and observing the damage degree of the diamond compacts after punching for different times under the same impact force (50J). Referring to fig. 3, some of the diamond compacts prepared by the above preparation method were damaged to different degrees by 2, 12, 21, 22, 25, 34, and 46 impacts, and only a small portion of the diamond compacts were worn out after 50 impacts, so that it was found that the diamond compacts prepared by the above preparation method had uneven quality and unstable use properties. In the grinding area test, four different positions are respectively 0 degrees, 90 degrees, 180 degrees and 270 degrees, and the grinding area test method is as follows: turning granite by using the diamond composite sheet, and turning the diamond composite sheet for 0 time, 10 times, 20 times, 30 times and 40 times respectively at different positions after turning granite with a certain volume. Referring to fig. 4 and 5, after turning for the same number of times, the sizes of the grinding areas at four positions are obviously inconsistent through visual inspection, so that the thicknesses of the polycrystalline layer 1 and the transition layer 2 of the diamond compact prepared by the preparation method are uneven, the performances of different parts of the same compact are greatly different, the wear resistance and the impact resistance of the polycrystalline layer on the diamond compact are weak, and the service life of the diamond compact is short.
Disclosure of Invention
A first object of the present invention is to provide a polycrystalline diamond compact that improves wear resistance and impact resistance of the polycrystalline diamond compact.
A second object of the present invention is to provide a method for manufacturing the diamond compact described above.
In order to achieve the first purpose, the preparation method of the polycrystalline diamond compact sequentially carries out a pre-pressing forming step and a high-temperature and high-pressure step, wherein the pre-pressing forming step comprises the steps of placing diamond micro powder in a metal round cup, pre-pressing the diamond micro powder in the metal round cup through a pressing block, forming a working layer pre-forming body by the diamond micro powder, and arranging an outer chamfer on the pressing end of the pressing block along the circumferential direction of the pressing block; the high-temperature high-pressure step comprises: and sintering the working layer pre-forming body and the hard alloy matrix in high-temperature and high-pressure equipment at high temperature and high pressure.
It is obvious by above-mentioned scheme, the pressure head through being provided with outer chamfer carries out the pre-compaction to the diamond miropowder in the metal circular cup, the working layer preforming body that forms corresponds the position of outer chamfer and is formed with the arch, the quantity of the compound piece edge miropowder of diamond has been increased, the density of edge has been improved, and the diamond miropowder forms the working layer preforming body after the pre-compaction, the even unanimity of thickness everywhere of working layer preforming body, the working area of the compound piece of diamond has been increased, thereby the wearability and the shock resistance of the compound piece of diamond have been improved, the.
Further, the outer chamfer is a straight chamfer, and the angle of the outer chamfer is 10-45 degrees.
Further, the angle of the outer chamfer is 15-25 degrees.
It can be seen that when the angle of the outer chamfer is within the above range, the impact resistance of the obtained diamond compact is optimal.
The further proposal is that the times of prepressing the diamond micro powder by the pressing block is more than or equal to 1 time, and the pressure of each prepressing is 0.1 MPa-1 MPa.
Therefore, the diamond micro powder is pre-pressed through the pressing block, the thickness of the working layer pre-forming body is uniform, the gap between the pre-pressed diamond micro powder is smaller, the diamond micro powder at each position of the working layer pre-forming body is more compact, and the wear resistance and the impact resistance of the diamond composite sheet are improved.
The further proposal is that the thickness of the working layer preforming body is 1.5 mm-3.0 mm.
The further scheme is that the high-temperature and high-pressure steps are as follows: placing a hard alloy matrix in the metal round cup, contacting the hard alloy matrix with the compression surface of the working layer preformed body, placing the metal round cup with the hard alloy matrix and the working layer preformed body in a pyrophyllite block, and then sintering at high temperature and high pressure in high-temperature and high-pressure equipment.
The further proposal is that in the high-temperature and high-pressure step, the sintering temperature of the sintered hard alloy matrix and the working layer pre-formed body is 1350 ℃ to 1650 ℃, and the sintering pressure is 6GPa to 8 GPa.
The preparation method further comprises a transition layer step, wherein the transition layer step is between the pre-pressing forming step and the high-temperature high-pressure step; the transition layer step comprises the steps of placing materials of the transition layer on a preformed body of the working layer, prepressing the materials of the transition layer for more than or equal to 1 time through a pressing block, forming the preformed body of the transition layer by the materials of the transition layer, enabling the preformed body of the transition layer to be located between the preformed body of the working layer and the hard alloy substrate, and enabling the materials of the transition layer to comprise diamond micro powder and tungsten powder.
Therefore, in the step of the transition layer, the transition layer material is pre-pressed through the pressing block, so that the thickness proportion of the transition layer and the working layer is kept uniform and consistent, the stability of the diamond compact in the sintering process is ensured, and the impact resistance and the wear resistance of the diamond compact are ensured.
The further scheme is that the ratio of the thickness of the working layer of the polycrystalline diamond compact to the thickness of the transition layer of the polycrystalline diamond compact is 1: 1-4: 1.
it can be seen that, when the thickness of transition layer is guaranteed in the control of ratio scope between the thickness of working layer preforming body and the thickness of transition layer preforming body, the working area of diamond compact piece working layer has been increased, the sintering quality of diamond compact piece is improved, the wearability of diamond compact piece has been guaranteed, when the ratio is too little, the working layer thickness reduces, and the working area reduces, and when the ratio is too big, the transition layer effect diminishes, influences the wearability of diamond compact piece.
In order to achieve the second object, the polycrystalline diamond compact provided by the invention is prepared by the preparation method of the polycrystalline diamond compact, and the polycrystalline diamond compact comprises a working layer and a hard alloy substrate, wherein an inner chamfer is arranged on one side of the working layer, which faces the hard alloy substrate.
Drawings
Fig. 1 is an enlarged view of a working layer of a prior art diamond compact.
Fig. 2 is an enlarged view of a working layer and a transition layer of a prior art diamond compact.
Fig. 3 is a graph showing the effect of the diamond compact after impact resistance test in the background art.
Fig. 4 is a graph of the effect of the diamond compact ground area test in the background art.
Fig. 5 is an area histogram of a diamond compact ground area test of the background art.
Fig. 6 is an enlarged view of a working layer and a transition layer in a polycrystalline diamond compact of the present invention.
Fig. 7 is a graph illustrating the effect of various embodiments of the polycrystalline diamond compact of the present disclosure under fluorescence after impact resistance testing.
Fig. 8 is a graph of the results of the wear area tests of the polycrystalline diamond compact experimental group 1 according to the present invention.
Fig. 9 is a graph of the results of the wear area tests of the polycrystalline diamond compact experimental group 2 according to the present invention.
Fig. 10 is an area histogram of a polycrystalline diamond compact of the present invention after a ground area test of examples 1 and 2.
Fig. 11 is an area histogram of a ground area test of polycrystalline diamond compacts of examples 3-5 of the present invention.
The invention is further explained with reference to the drawings and the embodiments.
Detailed Description
The preparation method of the polycrystalline diamond compact is applied to preparation work of the polycrystalline diamond compact, and comprises the steps of pre-pressing and forming, transition layer and high temperature and high pressure in sequence, wherein the step of pre-pressing and forming comprises the steps of placing diamond micro powder in a metal round cup, pre-pressing the diamond micro powder in the metal round cup through a pressing block, the pre-pressing frequency is more than or equal to 1, preferably 2, the pre-pressing pressure is 0.1-1 MPa, the numerical value of the pre-pressing pressure is in direct proportion to the area of a diamond layer to be pressed, and the larger the area is, the higher the pre-pressing pressure is. The diamond micropowder forms a working layer preformed body, the thickness of the working layer preformed body is related to the formula and the size of a finished product, the thickness of the working layer preformed body is 1.5 mm-3.0 mm, and preferably, the thickness of the working layer preformed body is 1.70 mm. An outer chamfer is arranged on the pressing end of the pressing block along the circumferential direction of the pressing block, the angle of the outer chamfer is 10-45 degrees, preferably, the angle of the outer chamfer is 15-25 degrees, and further preselection is carried out, and the angle of the outer chamfer is 15-20 degrees. In the pre-pressing forming step, the working layer pre-forming body comprises diamond micro powder with different granularities, the main granularity of the diamond micro powder is 15-25 mu m, and the proportion of the diamond micro powder with each granularity can be adjusted according to the actual using place of the product during production.
In the step of the transition layer, the material of the transition layer is placed on a preformed body of the working layer in the metal round cup, the preformed body of the working layer is positioned at the bottom of the metal round cup, and the material of the transition layer is positioned on the upper layer of the preformed body of the working layer. And (3) pre-pressing the transition layer material for more than or equal to 1 time through the pressing block, wherein the pre-pressing time is more than or equal to 1, the pre-pressing time is 2 times, and the pre-pressing pressure is 0.1-1.0 MPa. The transition layer material comprises diamond micro powder and tungsten powder, the granularity of the diamond micro powder is 15-50 mu m, and the proportion between the diamond micro powder and the tungsten powder can be adjusted according to the actual use place of the product during production.
Referring to fig. 6, there is a clear boundary line 3 between the working layer 1 and the transition layer 2, the side wall of the working layer 1 facing the transition layer 2 is convexly formed with an inner chamfer 31, the inner chamfer 31 is formed corresponding to the outer chamfer on the compact, and the shape of the side wall of the working layer 1 facing the transition layer 2 depends on the shape of the pressing end of the compact. The shape of the side wall of the working layer 1 facing the transition layer 2 is arranged along the central axis of the metal round cup in a central symmetry mode.
In the preparation method, the working layer preformed body corresponds to the working layer of the sintered polycrystalline diamond compact, and the transition layer preformed body corresponds to the transition layer of the sintered polycrystalline diamond compact. The ratio of the thickness of the working layer of the polycrystalline diamond compact to the thickness of the transition layer of the polycrystalline diamond compact is 1: 1-4: 1, preferably, the ratio between the thickness of the working layer preform and the thickness of the transition layer preform is 2: 1-3: 1.
The high-temperature high-pressure step comprises the steps of placing a hard alloy matrix in a metal round cup, enabling the hard alloy matrix to be in contact with the pressure surface of the transition layer preformed body, and placing the metal round cup with the hard alloy matrix and the transition layer preformed body in a known high-temperature high-pressure device for high-temperature high-pressure sintering. In the step, the sintering temperature of the hard alloy matrix and the working layer pre-forming body is 1350-1650 ℃, and the sintering pressure is 6.0-8.0 GPa. In the pre-pressing forming step and the transition layer step, the hard alloy layer can be used as a pressing block, the shape of the working layer preformed body and the shape of the transition layer preformed body are matched with the shape of the hard alloy substrate, and in the high-temperature and high-pressure step, the sintering quality is better when the working layer preformed body and the transition layer preformed body are sintered on the hard alloy substrate. Referring to fig. 6, an outer chamfer 4 is also arranged on the side wall of the working layer 1 of the sintered diamond compact away from the hard alloy substrate. The side wall of the hard alloy substrate facing the working layer can be provided with protrusions with different shapes, and the protrusions can be wave-shaped or in other shapes so as to increase the contact area between the hard alloy substrate and the transition layer or the working layer.
In order to make the technical solution and the technical effect of the present invention clearer and clearer, the following examples are given to further describe the specific embodiments of the present invention, but the present invention is not limited thereto.
Experimental group 1
The impact resistance and wear resistance of the diamond compact were tested by comparing the experimental group 1 with the same diamond layer thickness but with different outer chamfer angles of the compact.
Example 1
The diamond compact of example 1 was prepared by the above polycrystalline diamond compact, the sum of the thicknesses of the working layer and the transition layer was 2.2mm, and the angle of the outer chamfer of the compact used in the pre-press forming step and the transition layer step was 15 ° to 20 °.
Example 2
Example 2 differs from example 1 in that: the angle of the outer chamfer of the pressing block used in the pre-pressing forming step and the transition layer step is 20-30 degrees.
EXAMPLE 2 group
And (3) testing the impact resistance and the wear resistance of the diamond compact by comparing the experimental group 2 under the conditions that the thickness of the diamond layer is the same, the outer chamfer angle of the compact is the same, but the thickness of the working layer is different from that of the transition layer.
Example 3
The diamond compact in example 3 was prepared by the above polycrystalline diamond compact preparation method, wherein the angle of the outer chamfer of the compact was 15 ° to 20 °, the thickness of the working layer was 1.85mm, and the thickness of the transition layer was 0.35 mm.
Example 4
Example 4 differs from example 3 in that: the thickness of the working layer is 1.7mm, and the thickness of the transition layer is 0.5 mm.
Example 5
Example 4 differs from example 3 in that: the thickness of the working layer is 1.4mm, and the thickness of the transition layer is 0.8 mm.
The impact resistance test and the ground area side wall were performed separately for the above 5 examples.
The impact resistance test method is as follows: and (3) putting different diamond compacts into an impact resistance device, and observing the damage degree of the diamond compacts after punching for different times under the same impact force (50J).
The ground area test method comprises the following steps: turning granite by using the diamond composite sheet, and after turning a certain volume of granite, respectively measuring the ground areas of the diamond composite sheet at different positions for 0 time, 10 times, 20 times, 30 times, 40 times and 60 times.
Referring to fig. 7, example 1, example 2, example 3, example 4 and example 5 were arranged in order from top to bottom, and cracks in the impact site after the impact were observed under fluorescence. As can be seen, the diamond compacts of examples 1, 2, 3, 4 and 5 were less damaged after 50 impacts of 50J, respectively, wherein only one sample of example 1 showed fine cracks and 4 samples of example 2 showed no cracks, compared with example 1 and example 2 in experimental group 1. In contrast, in experimental group 2, three of the four samples in example 3 showed fine cracks, and the rate of cracks in examples 4 and 5 was less, thus showing that the diamond compacts in examples 1, 2, 3, 4 and 5 had good impact resistance.
In performing the ground area test, the diamond compacts of examples 1, 2 and 3 were subjected to the ground area test in units of mm at two positions of 0 ° and 180 ° of rotation of the diamond compacts themselves, respectively2。
Referring to fig. 8, 9, 10, and 11, after the diamond compact of examples 1 to 5 and the existing diamond compact are turned the same number of times, the ground area of the diamond compact of examples 1 to 5 is significantly smaller, which illustrates that when the polycrystalline diamond compact is prepared, the number of edges of the diamond compact can be effectively increased by pre-pressing the diamond micro powder through the pressing block provided with the outer chamfer, and the density of the edges is improved, thereby improving the wear resistance of the diamond compact. As can be seen from the figure, comparing the ground areas at two positions in example 1, the ground areas at two positions in example 2, and the ground areas at two positions in example 3, the differences between the ground areas at different positions of the same diamond compact are not great, which indicates that the thickness of the diamond compact is uniform at each position, and the performance of the diamond compact is stable. Compared with the examples 3, 4 and 5, the diamond compact of the example 5 has the grinding area larger than that of the examples 3 and 4, so that when the ratio of the thickness of the working layer to the thickness of the transition layer is 2: 1-4: 1, the grinding area of the diamond compact is smaller, and the wear resistance is better.
The diamond micro powder in the metal round cup is pre-pressed by the pressure head with the outer chamfer, and the formed working layer pre-forming body is provided with a bulge at the position corresponding to the outer chamfer, so that the quantity of the micro powder at the edge of the diamond composite sheet is increased, the density at the edge is improved, and the working area of the diamond composite sheet is increased, so that the wear resistance and impact resistance of the diamond composite sheet are improved, and the service life of the diamond composite sheet is prolonged; meanwhile, the working layer preformed body is formed by pre-pressing the diamond micro powder, the thickness of each part of the working layer preformed body is uniform, and the production quality of the diamond composite sheet and the overall performance of the diamond composite sheet are greatly improved.
Finally, it should be emphasized that the above-described preferred embodiments of the present invention are merely examples of implementations, rather than limitations, and that many variations and modifications of the invention are possible to those skilled in the art, without departing from the spirit and scope of the invention.
Claims (10)
1. The preparation method of the polycrystalline diamond compact is characterized by comprising the following steps: sequentially carrying out a prepressing molding step and a high-temperature high-pressure step;
The pre-pressing forming step comprises: placing diamond micro powder in a metal round cup, prepressing the diamond micro powder in the metal round cup through a pressing block, forming a working layer preformed body by the diamond micro powder, and arranging an outer chamfer on the pressing end of the pressing block along the circumferential direction of the pressing block;
the high temperature and high pressure step comprises: and sintering the working layer pre-forming body and the hard alloy matrix in high-temperature and high-pressure equipment at high temperature and high pressure.
2. The method of making a polycrystalline diamond compact of claim 1, wherein:
the outer chamfer is a straight chamfer, and the angle of the outer chamfer is 10-45 degrees.
3. The method of making a polycrystalline diamond compact of claim 2, wherein:
the angle of the outer chamfer is 15-25 degrees.
4. The method of making a polycrystalline diamond compact of claim 1, wherein:
the number of times of prepressing the diamond micro powder by the pressing block is more than or equal to 1, and the prepressing pressure is 0.1 MPa-1 MPa each time.
5. The method of making a polycrystalline diamond compact of claim 1, wherein:
the thickness of the working layer preforming body is 1.5 mm-3.0 mm.
6. The method of making a polycrystalline diamond compact of claim 1, wherein:
the high-temperature high-pressure step specifically comprises the following steps: placing a hard alloy matrix in the metal round cup, wherein the hard alloy matrix is in contact with the compression surface of the working layer preformed body, and after the metal round cup in which the hard alloy matrix and the working layer preformed body are placed is placed in a pyrophyllite block, performing high-temperature high-pressure sintering in a high-temperature high-pressure device.
7. The method of making a polycrystalline diamond compact of claim 6, wherein:
in the high-temperature high-pressure step, the sintering temperature for sintering the hard alloy matrix and the working layer pre-forming body is 1350-1650 ℃, and the sintering pressure is 6.0-8.0 GPa.
8. The method of making a polycrystalline diamond compact of claim 1, wherein:
the preparation method also comprises a transition layer step, wherein the transition layer step is arranged between the pre-pressing forming step and the high-temperature high-pressure step;
the transition layer step comprises the steps of placing a transition layer material on the working layer preformed body, pre-pressing the transition layer material for more than or equal to 1 time through the pressing block, forming a transition layer preformed body by the transition layer material, wherein the transition layer preformed body is positioned between the working layer preformed body and the hard alloy substrate, and the transition layer material comprises the diamond micro powder and the tungsten powder.
9. The method of making a polycrystalline diamond compact of claim 8, wherein:
the ratio of the thickness of the working layer of the polycrystalline diamond compact to the thickness of the transition layer of the polycrystalline diamond compact is 1: 1-4: 1.
10. polycrystalline diamond compact, its characterized in that: the polycrystalline diamond compact is prepared by the preparation method of any one of claims 1 to 9, and comprises a working layer and a hard alloy substrate, wherein an inner chamfer is arranged on one side of the working layer facing the hard alloy substrate.
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| CN102606082A (en) * | 2012-03-29 | 2012-07-25 | 成都比拓超硬材料有限公司 | Diamond compact and manufacturing process for same |
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