CN116237519B - A high performance polycrystalline diamond composite sheet and preparation method thereof - Google Patents
A high performance polycrystalline diamond composite sheet and preparation method thereof Download PDFInfo
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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
- B22F3/10—Sintering only
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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
- B22F7/02—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 layers
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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
- B22F2302/00—Metal Compound, non-Metallic compound or non-metal composition of the powder or its coating
- B22F2302/40—Carbon, graphite
- B22F2302/406—Diamond
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Abstract
本发明涉及超硬材料技术领域，尤其涉及一种高性能聚晶金刚石复合片及其制备方法，高性能聚晶金刚石复合片包括聚晶金刚石层以及位于所述聚晶金刚石层一侧的硬质合金基体；所述聚晶金刚石层中含有5‑25wt％的D50粒径为25‑45微米的粗粒度金刚石颗粒。本发明通过另外添加的粗粒度金刚石颗粒，能够使PDC复合片在保持高耐磨性能的基础上，有效提升PDC复合片聚晶层的抗冲击性能。本发明另外在金刚石原料中添加5‑25wt％的D50粒径为25‑45微米的粗粒度金刚石颗粒，能够阻挡裂纹的继续生长，从而提高聚晶金刚石层的抗冲击性能，使得聚晶金刚石复合片同时兼具耐磨性能和抗冲击性能。
The present invention relates to the technical field of superhard materials, and in particular to a high-performance polycrystalline diamond composite sheet and a preparation method thereof, wherein the high-performance polycrystalline diamond composite sheet comprises a polycrystalline diamond layer and a cemented carbide substrate located on one side of the polycrystalline diamond layer; the polycrystalline diamond layer contains 5‑25wt% of coarse-grained diamond particles with a D50 particle size of 25‑45 microns. The present invention can effectively improve the impact resistance of the polycrystalline layer of the PDC composite sheet while maintaining high wear resistance through the additionally added coarse-grained diamond particles. The present invention also adds 5‑25wt% of coarse-grained diamond particles with a D50 particle size of 25‑45 microns to the diamond raw material, which can prevent the continued growth of cracks, thereby improving the impact resistance of the polycrystalline diamond layer, so that the polycrystalline diamond composite sheet has both wear resistance and impact resistance.
Description
Technical Field
The invention relates to the technical field of superhard materials, in particular to a high-performance polycrystalline diamond compact and a preparation method thereof.
Background
The diamond compact is a superhard composite material which is prepared by taking diamond micro powder and a hard alloy matrix as raw materials and firing the raw materials under the conditions of high temperature and high pressure. The diamond compact has the wear resistance of diamond and the impact resistance of hard alloy, so that the diamond compact is widely applied to the fields of oil drilling, geological drilling, coal field exploitation and the like.
At present, a plurality of methods for improving the overall impact resistance of the diamond compact are provided, but few mention is made of how to improve the impact resistance of a diamond layer. Compared with a hard alloy matrix, the diamond layer has high hardness and good wear resistance, but the impact toughness is far different, so that the diamond layer is easy to break under the action of high impact in the use process of the composite sheet, and the whole composite sheet is invalid. When the composite sheet is impacted in the practical use process, cracks can be generated from gaps among diamond particles with lower strength, and along with the continuous progress of the impact process, the cracks continuously grow along the gaps among diamond grains of the diamond until the whole diamond layer is broken.
In the prior art, the impact resistance and wear resistance of the diamond compact can be generally adjusted by adjusting the particle size of the diamond particles, wherein the diamond particles with larger particle size can provide better impact resistance, and the diamond particles with smaller particle size can provide higher wear resistance. However, in practical application, the diamond compact is generally required to have better impact resistance and good wear resistance, which is obviously difficult to be realized by simply adjusting the particle size.
Accordingly, the prior art is still in need of improvement and development.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, the present invention aims to provide a high-performance polycrystalline diamond compact and a preparation method thereof, which aims to solve the problem that the wear resistance and impact resistance of the diamond layer of the existing diamond compact cannot be simultaneously achieved.
The technical scheme of the invention is as follows:
a high-performance polycrystalline diamond compact comprises a polycrystalline diamond layer and a hard alloy matrix positioned on one side of the polycrystalline diamond layer, wherein the polycrystalline diamond layer contains 5-25wt% of coarse-grained diamond particles with the D50 particle size of 25-45 micrometers.
A preparation method of a high-performance polycrystalline diamond compact comprises the following steps:
mixing diamond micro powder with different particle diameters below 15 microns to obtain a diamond raw material;
adding coarse-grained diamond particles into the diamond micro powder, and mixing to obtain premix, wherein the D50 grain diameter of the coarse-grained diamond particles is 25-45 microns;
filling the premix into a die, and then putting the die into a hard alloy matrix to obtain an assembly;
And placing the assembly into a top press for sintering treatment to obtain the high-performance polycrystalline diamond compact.
The preparation method of the high-performance polycrystalline diamond compact comprises the step of mixing two or more diamond raw materials, wherein the two or more diamond raw materials are selected from diamond micropowder with the particle size below 15 microns.
The preparation method of the high-performance polycrystalline diamond compact comprises the step of preparing a polycrystalline diamond compact, wherein the mass of coarse-grained diamond particles accounts for 5% -25% of the total mass of the diamond raw materials.
The preparation method of the high-performance polycrystalline diamond compact comprises the step of preparing the polycrystalline diamond compact, wherein the mass of coarse-grained diamond particles accounts for 10% -15% of the total mass of the diamond raw materials.
The preparation method of the high-performance polycrystalline diamond compact comprises the step of preparing a high-performance polycrystalline diamond compact, wherein the D50 particle size of coarse-grained diamond particles is 1.5-5 times of the D50 particle size of main-grained diamond in the diamond raw material.
The preparation method of the high-performance polycrystalline diamond compact comprises the step of forming a die into a metal cup.
The preparation method of the high-performance polycrystalline diamond compact comprises the step of preparing a metal cup by a metal method, wherein the metal cup is made of one of zirconium, niobium, molybdenum and tantalum.
The preparation method of the high-performance polycrystalline diamond compact comprises the step of preparing a high-performance polycrystalline diamond compact by using a cubic press.
The preparation method of the high-performance polycrystalline diamond compact comprises the steps of sintering at a temperature of 1300-1800 ℃ for 200-600s, wherein the pressure of the sintering process is 5.5-10.0 GPa.
The high-performance polycrystalline diamond compact comprises a polycrystalline diamond layer and a hard alloy matrix positioned on one side of the polycrystalline diamond layer, wherein 5-25wt% of coarse-grained diamond particles with the D50 particle size of 25-45 microns are contained in the polycrystalline diamond layer. According to the invention, through additionally adding the coarse-grained diamond particles, the impact resistance of the PDC composite sheet polycrystalline layer can be effectively improved on the basis of maintaining high wear resistance of the PDC composite sheet. When the traditional diamond compact is subjected to continuous impact, fine cracks can be generated in gaps among diamond particles with weak strength of a polycrystalline layer, and along with the continuous progress of the impact, the micro cracks continuously grow along the diamond gaps until the whole polycrystalline diamond layer is broken to cause the compact to fail.
Drawings
FIG. 1 is a schematic illustration of a high performance polycrystalline diamond compact of the present invention;
Fig. 2 is a schematic structural view of coarse diamond particles in a diamond layer of a high performance polycrystalline diamond compact of the present invention blocking crack growth.
Detailed Description
The invention provides a high-performance polycrystalline diamond compact and a preparation method thereof, and the invention is further described in detail below for the purpose, the technical scheme and the effect of the invention to be clearer and clearer. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
It will be understood by those skilled in the art that all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs unless defined otherwise. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
As shown in fig. 1, the invention provides a high-performance polycrystalline diamond compact, which comprises a polycrystalline diamond layer 1 and a hard alloy matrix 2 positioned on one side of the polycrystalline diamond layer, wherein the polycrystalline diamond layer 1 contains 5-25wt% of coarse-grained diamond particles 3 with the D50 particle size of 25-45 micrometers.
When the composite sheet is subjected to continuous impact in the actual use process, microcracks are easy to generate in gaps among diamond particles with weaker strength, and along with the continuous progress of the impact, the microcracks continuously grow along the gaps among the diamond particles until the whole polycrystalline diamond layer is broken. In the invention, 5-25wt% of coarse-grained diamond particles with the D50 particle size of 25-45 microns are additionally added into the polycrystalline diamond layer of the composite sheet, so that the effect of blocking crack growth can be achieved, and as shown in figure 2, when the microcracks 4 encounter coarse-grained diamond particles with higher strength in the process of growing along gaps between the diamond particles, the growth process of the microcracks 4 is blocked.
In the present embodiment, the coarse-grain diamond particles having a D50 particle diameter of 25 to 45 μm means that, in the coarse-grain diamond particles, the particle diameter corresponding to a cumulative particle size distribution percentage of 50% is 25 to 45 μm.
In addition, the invention provides a preparation method of the high-performance polycrystalline diamond compact, which comprises the following steps:
Step S10, mixing diamond micro powder with different particle diameters below 15 microns to obtain a diamond raw material;
Step S20, adding coarse-grain diamond particles into the diamond micro powder, and mixing to obtain premix, wherein the D50 grain diameter of the coarse-grain diamond particles is 25-45 microns;
s30, filling the premix into a die, and then putting a hard alloy matrix into the die to obtain an assembly;
And step S40, placing the assembly into a top press for sintering treatment to obtain the high-performance polycrystalline diamond compact.
The method comprises the steps of adding coarse-grained diamond particles with the D50 particle size of 25-45 microns into a polycrystalline diamond layer of a composite sheet, playing a role in blocking crack growth, putting the premix into a die in combination with the preparation method, putting a hard alloy matrix into the die to obtain an assembly, putting the assembly into a top press for sintering treatment, and effectively improving the wear resistance and impact resistance of the polycrystalline diamond composite sheet, wherein when cracks meet coarse-grained diamond particles with higher strength in the process of growing along gaps of the diamond particles, the crack growth process is blocked.
In some embodiments, the diamond feedstock is selected from two or more of diamond micropowder having a particle size of 15 microns or less.
As examples, the particle size of the diamond fine powder is not limited to 1 micron, 2 microns, 3 microns, 4 microns, 4.5 microns, 5 microns, 6 microns, 8 microns, 9.5 microns, but is certainly not limited to an integer, and may be a natural number of 0 to 15, and in the present embodiment, two or more diamond fine powders with particle sizes are mixed as diamond raw materials. The polycrystalline diamond compact prepared by mixing two or more diamond micro powders with different particle sizes as diamond raw materials has higher wear resistance.
In some embodiments, the mass of the coarse-size diamond particles is 5% -25% of the total mass of the diamond feedstock. When the addition amount of coarse-grained diamond particles in the polycrystalline diamond layer of the composite sheet is lower than 5wt%, the impact resistance improving effect on the diamond layer is not obvious, and when the addition amount of coarse-grained diamond particles in the polycrystalline diamond layer of the composite sheet is higher than 25wt%, the original wear resistance of the composite sheet is reduced. Therefore, in order to ensure that the impact resistance of the polycrystalline diamond layer is improved on the premise of not reducing the original wear resistance of the composite sheet, the mass of the coarse-grain diamond particles needs to be 5% -25% of the total mass of the diamond raw material, and the composite sheet has high wear resistance and high impact resistance.
In a preferred embodiment, the mass of the coarse-grain diamond particles accounts for 10% -15% of the total mass of the diamond raw materials, and the mass of the coarse-grain diamond particles can achieve optimal wear-resisting effect and impact-resisting effect under the ratio, so that the service life of the polycrystalline diamond compact is prolonged.
In some embodiments, the coarse-size diamond particles have a D50 particle size that is 1.5 to 5 times the primary-size diamond D50 particle size of the diamond feedstock. The method comprises the steps of obtaining a coarse-grained diamond particle with a D50 particle size smaller than 1.5 times of the D50 particle size of a diamond raw material, wherein the effect of improving the impact resistance of the diamond layer is not obvious when the D50 particle size of the coarse-grained diamond particle is smaller than 1.5 times of the D50 particle size of the diamond raw material, reducing the wear resistance of an original composite sheet, and determining the D50 of 5-25wt% of the coarse-grained diamond particle to be 25-45 micrometers on the premise of not reducing the wear resistance of the original composite sheet, wherein the D50 particle size of the coarse-grained diamond particle is 1.5-5 times of the D50 particle size of main-grained diamond in the diamond raw material.
In some embodiments, the mold is a metal cup.
In some embodiments, the metal cup is made of one of zirconium, niobium, molybdenum and tantalum, and is not easy to crack and damage under high temperature and high pressure.
In some embodiments, the top press is a hexahedral top press.
In some embodiments, the sintering process is performed at a pressure of 5.5-10.0GPa, at a temperature of 1300-1800 ℃, and for a time of 200-600s. The sintering treatment pressure, temperature and time can further strengthen the wear resistance and impact resistance of the polycrystalline diamond compact and prolong the service life of the polycrystalline diamond compact.
The following examples are further illustrative of the invention. It is also to be understood that the following examples are given solely for the purpose of illustration and are not to be construed as limitations upon the scope of the invention, since numerous insubstantial modifications and variations will now occur to those skilled in the art in light of the foregoing disclosure.
Comparative example 1
A preparation method of a high-performance polycrystalline diamond compact comprises the following steps:
and uniformly mixing two or more than two diamond micro-powder with the particle size of less than 15 microns according to a certain mass ratio to obtain a diamond raw material, wherein the mass ratio of diamond particles with the particle size of 12-15 microns is 40%, the mass ratio of diamond particles with the particle size of 8-10 microns is 30%, and the mass ratio of diamond particles with the particle size of 5-8 microns is 30%.
Filling the uniformly mixed diamond micro powder into a metal cup, and then putting the metal cup into a hard alloy matrix to obtain an assembly, wherein the metal cup is made of metal niobium;
And (3) placing the assembled assembly into a hexahedral top press for high-temperature and high-pressure sintering to obtain the diamond composite sheet, wherein the high-temperature and high-pressure sintering condition is that the pressure is 6.0Gpa, the temperature is 1400 ℃, and the sintering time is 600S.
The diamond composite sheet prepared by the process has the abrasion ratio of 2083 multiplied by 10 4 and the average impact energy of 240J, and is shown in the table 1.
Example 1
A preparation method of a high-performance polycrystalline diamond compact comprises the following steps:
Uniformly mixing two or more than two diamond micro-powders below 15 microns according to a certain mass ratio to obtain a diamond raw material, wherein the mass ratio of diamond particles with the particle size of 12-15 microns is 40%, the mass ratio of diamond particles with the particle size of 8-10 microns is 30%, and the mass ratio of diamond particles with the particle size of 5-8 microns is 30%.
And (2) adding coarse-grain diamond particles with the D50 of 25-45 microns accounting for 5% -25% of the total mass of the diamond raw materials into the uniformly mixed diamond raw materials, and then uniformly mixing again, wherein the D50 of the coarse-grain diamond particles is 30 microns, and the proportion of the coarse-grain diamond particles is 10% of the total mass of the diamond raw materials.
Filling the diamond micro powder which is mixed uniformly again into a metal cup, and then putting the metal cup into a hard alloy matrix to obtain an assembly, wherein the metal cup is made of metal niobium;
And (3) placing the assembled assembly into a hexahedral top press for high-temperature and high-pressure sintering to obtain the diamond composite sheet, wherein the high-temperature and high-pressure sintering condition is that the pressure is 6.0Gpa, the temperature is 1400 ℃, and the sintering time is 600S.
The abrasion ratio of the diamond composite sheet prepared by the process is 2142 multiplied by 10 4, the average impact energy is 320J, and the impact resistance of the diamond composite sheet is improved by about 33 percent compared with that of the original diamond composite sheet, and the specific abrasion ratio is shown in the table 1.
Comparative example 2
A preparation method of a high-performance polycrystalline diamond compact comprises the following steps:
Mixing two or more than two diamond micro-powder below 15 micrometers uniformly according to a certain mass ratio to obtain the diamond raw material, wherein the mass ratio of diamond particles with the granularity of 10-12 micrometers is 70%, and the mass ratio of diamond particles with the granularity of 5-8 micrometers is 30%.
Filling the uniformly mixed diamond raw materials into a metal cup, and then putting the metal cup into a hard alloy matrix to obtain an assembly, wherein the metal cup is made of zirconium;
and (3) placing the assembled assembly into a hexahedral top press for high-temperature and high-pressure sintering to obtain the diamond composite sheet, wherein the high-temperature and high-pressure sintering condition is that the pressure is 7.0Gpa, the temperature is 1500 ℃, and the sintering time is 400S.
The diamond composite sheet prepared by the process has the abrasion ratio of 3984 multiplied by 10 4 and the average impact energy of 260J, and is shown in the table 1.
Example 2
A preparation method of a high-performance polycrystalline diamond compact comprises the following steps:
Mixing two or more than two diamond micro-powder below 15 micrometers uniformly according to a certain mass ratio to obtain the diamond raw material, wherein the mass ratio of diamond particles with the granularity of 10-12 micrometers is 70%, and the mass ratio of diamond particles with the granularity of 5-8 micrometers is 30%.
And (3) adding coarse-grain diamond particles with the D50 of 25-45 microns accounting for 5% -25% of the total mass of the diamond raw materials into the uniformly mixed diamond raw materials, and then uniformly mixing again, wherein the D50 of the coarse-grain diamond particles is 25 microns and accounts for 15% of the total mass of the diamond raw materials.
Filling the diamond micro powder which is mixed uniformly again into a metal cup, and then putting the metal cup into a hard alloy matrix to obtain an assembly, wherein the metal cup is made of zirconium metal;
and (3) placing the assembled assembly into a hexahedral top press for high-temperature and high-pressure sintering to obtain the diamond composite sheet, wherein the high-temperature and high-pressure sintering condition is that the pressure is 7.0Gpa, the temperature is 1500 ℃, and the sintering time is 400S.
The diamond composite sheet prepared by the process has the abrasion ratio of 4032 multiplied by 10 4, the average impact energy of 350J, and the impact resistance improved by about 35 percent compared with the original diamond composite sheet, particularly as follows
Table 1 shows the results.
In summary, the high-performance polycrystalline diamond compact and the preparation method thereof provided by the invention comprise a polycrystalline diamond layer and a hard alloy matrix positioned on one side of the polycrystalline diamond layer, wherein the polycrystalline diamond layer contains 5-25wt% of coarse-grained diamond particles with the D50 particle size of 25-45 micrometers. According to the invention, through additionally adding the coarse-grained diamond particles, the impact resistance of the PDC composite sheet polycrystalline layer can be effectively improved on the basis of maintaining high wear resistance of the PDC composite sheet. When the traditional diamond compact is subjected to continuous impact, fine cracks can be generated in gaps among diamond particles with weak strength of a polycrystalline layer, and along with the continuous progress of the impact, the micro cracks continuously grow along the diamond gaps until the whole polycrystalline diamond layer is broken to cause the compact to fail; therefore, the polycrystalline diamond compact prepared by the invention solves the problem that the existing diamond compact is difficult to have both wear resistance and impact resistance.
It is to be understood that the invention is not limited in its application to the examples described above, but is capable of modification and variation in light of the above teachings by those skilled in the art, and that all such modifications and variations are intended to be included within the scope of the appended claims.
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| CN103072332B (en) * | 2012-12-27 | 2016-03-02 | 深圳市海明润超硬材料股份有限公司 | A kind of composite polycrystal-diamond and preparation method thereof |
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