High-performance diamond drill bit suitable for hard rock drilling and preparation method of high-performance diamond drill bit

Abstract

The invention discloses a high-performance diamond drill bit suitable for hard rock drilling and a preparation method of the high-performance diamond drill bit, and relates to the technical field of diamond drill bit manufacturing, and the preparation method comprises the steps that S1, WC powder, 663Cu powder, Co powder, Ni powder and Mn powder are evenly mixed through a mixer, and alloy powder is obtained; according to the high-performance diamond drill bit suitable for hard rock drilling, the silicon carbide particles are added into the diamond drill bit, and the high-performance diamond drill bit suitable for hard rock drilling is developed; in addition, by adding Co with a certain mass fraction, the wettability of a copper alloy to WC can be improved, the toughness and the strength of the copper alloy can be improved, the holding force of an adhesive to diamond can be greatly increased, and the service life of the diamond drill bit is prolonged. The Ni powder with a certain mass fraction is added, so that good ductility and oxidation resistance are achieved, the mechanical property of a tire body is enhanced, and loss of low-melting-point metal is inhibited.

Description

Technical Field

[0001] The invention relates to the technical field of diamond drill bit manufacturing, and in particular to a high-performance diamond drill bit suitable for hard rock drilling and a preparation method thereof. Background Art

[0002] In drilling construction, the drill bit is the most important tool for directly breaking the formation rock. The performance of the drill bit greatly affects the drilling speed and economic benefits. At present, diamond drill bits have been widely used. Diamond drill bits usually include a rigid body and a matrix. The matrix is ​​provided with a number of blocks. The contact surface between the blocks and the processed object is its lip surface. At present, most of the conventional diamond drill bits used in geological exploration in my country are used for drilling hard rocks. It is found in use that diamond drill bits have low drilling efficiency, short drill bit life and easy broken teeth when drilling hard rocks. That is, the drilling efficiency and drill bit life are not ideal.

[0003] When drilling hard rock, the existing diamond drill bit is prone to breakage or severe wear, and cannot drill hard rock for a long time, resulting in extended drilling cycle and reduced work efficiency. Summary of the invention

[0004] In order to solve the above technical problems, a high-performance diamond drill bit suitable for hard rock drilling and a preparation method thereof are provided. The technical solution solves the problem that the existing diamond drill bit proposed in the above background technology is prone to drill bit breakage or severe drill bit wear when drilling hard rock, and is unable to drill hard rock for a long time, resulting in extended drilling cycle and reduced work efficiency.

[0005] In order to achieve the above purpose, the technical solution adopted by the present invention is:

[0006] A high-performance diamond drill bit suitable for hard rock drilling comprises the following components: 30% WC (tungsten carbide) powder, 50% 663Cu powder, 7% Co powder, 8% Ni powder and 5% Mn powder.

[0007] Preferably, the 663Cu powder comprises the following components: 85% Cu, 6% Sn, 6% Zn and 3% Pb.

[0008] Furthermore, a method for preparing a high-performance diamond drill bit suitable for hard rock drilling is proposed, comprising the following steps:

[0009] S1. Evenly mix WC powder, 663Cu powder, Co powder, Ni powder and Mn powder by a mixer to obtain alloy powder;

[0010] S2, adhering a thermosensitive adhesive to the bottom mold of the split graphite mold, placing diamond particles on the bottom mold, and obtaining the position of the diamond particles;

[0011] S3, adhering silicon carbide particles according to the positions of diamond particles;

[0012] S4, filling alloy powder into the split graphite mold, assembling a graphite pressing block to extrude the alloy powder inside the split graphite mold;

[0013] S5. Place the split graphite mold containing graphite compacts, alloy powders, diamond particles and silicon carbide particles into the energy-saving thyristor medium-frequency furnace KGBS-B for hot pressing and sintering to obtain a high-performance diamond drill bit suitable for hard rock drilling.

[0014] Preferably, the number of diamond particles used in preparing the high-performance diamond drill bit is 25.

[0015] Preferably, the volume concentration of diamond is 55%.

[0016] Preferably, the diamond has a particle size of 30 / 35 mesh.

[0017] Preferably, the number of silicon carbide grains used to prepare the high-performance diamond drill bit is 25 grains.

[0018] Preferably, the particle size of the silicon carbide is 40 / 45 mesh.

[0019] Preferably, the mixer is an HL10 mixer for uniformly mixing the powders, and the mixing time is set to 6 hours.

[0020] Preferably, the hot pressing sintering temperature is set to 980° C., the sintering pressure is set to 15 MPa, and the hot pressing sintering time is set to 4 minutes.

[0021] Compared with the prior art, the present invention provides a high-performance diamond drill bit suitable for hard rock drilling and a preparation method thereof, which has the following beneficial effects:

[0022] In the present invention, silicon carbide particles are added to a diamond drill bit to develop a high-performance diamond drill bit suitable for hard rock drilling. Through hard rock drilling experiments on diamond drill bits with silicon carbide particles added at different positions, it is found that the diamond drill bit with less contact between silicon carbide particles and diamond particles has the best comprehensive performance. In addition, adding a certain mass fraction of Co can improve the wetting performance of copper alloy to WC, enhance the toughness and strength of copper alloy, and greatly increase the holding force of adhesive to diamond. Adding a certain mass fraction of Ni powder often has good ductility and oxidation resistance, strengthens the mechanical properties of the matrix and inhibits the loss of low-melting-point metal. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 Graph showing the shedding rate of diamonds per four unit areas in the diamond drill bit experiment of the present invention;

[0024] Figure 2 Graphs showing weight loss of diamond drill bits per unit area in four types of diamond drill bit experiments in the present invention;

[0025] Figure 3 Four graphs of weight loss of grinding wheels per unit area in the diamond drill bit experiment of the present invention;

[0026] Figure 4 This is the wear morphology of sample No. 1 in the present invention;

[0027] Figure 5 and Figure 6 This is a schematic diagram of the surface structure of the matrix when the hard and brittle abrasive grains of sample No. 1 and the diamond do not come into contact with each other in the present invention;

[0028] Figure 7 for Figure 4 Simulation diagram of

[0029] Figure 8 This is the wear morphology of sample No. 2 in the present invention;

[0030] Fig. 9 and Fig.10 It is a schematic diagram of the surface structure of the matrix when the silicon carbide abrasive grains of sample No. 2 of the present invention are in contact with the diamond and are located in front of the diamond;

[0031] Fig.11 for Figure 8 Simulation diagram of

[0032] Fig.12 This is the wear morphology of sample No. 3 in the present invention;

[0033] Fig.13 It is a schematic diagram of the surface structure of the matrix when the silicon carbide abrasive grains of sample No. 3 of the present invention are in contact with the diamond and are located behind the diamond;

[0034] Fig.14 and Fig.16 This is the wear morphology of sample No. 3 in the present invention;

[0035] Fig.15 for Fig.14 Simulation diagram of

[0036] Fig.17 for Fig.16 Simulation diagram of

[0037] Fig.18 The figure is a schematic flow chart of the method for making a diamond drill bit in the present invention;

[0038] Fig.19It is a structural schematic diagram of the weakening effect of the diamond drill bit in the drilling process of the present invention;

[0039] Fig. 20 It is a schematic diagram of the structure of the diamond drill bit in the present invention that has local wear effect during the drilling process;

[0040] Fig.21 It is a structural schematic diagram of the diamond drill bit in the present invention having a weakening effect of holding force during drilling. DETAILED DESCRIPTION

[0041] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art may think of other obvious variations.

[0042] Reference Fig.18 As shown, a high-performance diamond drill bit suitable for hard rock drilling comprises the following components: 30% WC (tungsten carbide) powder, 50% 663Cu powder, 7% Co powder, 8% Ni powder and 5% Mn powder;

[0043] Adding a certain mass fraction of Co can improve the wetting performance of copper alloy to WC, enhance the toughness and strength of copper alloy, and greatly increase the holding force of adhesive to diamond. Adding a certain mass fraction of Ni powder often has good ductility and oxidation resistance, strengthens the mechanical properties of the matrix and inhibits the loss of low-melting-point metals. Mn is generally controlled within 5% and used as a deoxidizer.

[0044] The 663Cu powder includes the following composition: 85% Cu, 6% Sn, 6% Zn and 3% Pb.

[0045] Reference Figure 1 As shown, a method for preparing a high-performance diamond drill bit suitable for hard rock drilling comprises the following steps:

[0046] S1. Evenly mix WC powder, 663Cu powder, Co powder, Ni powder and Mn powder by using an HL10 mixer, and set the mixing time to 6 hours to obtain alloy powder;

[0047] S2, adhering a thermosensitive adhesive to the bottom mold of the split graphite mold, placing diamond particles on the bottom mold, and obtaining the position of the diamond particles;

[0048] S3, adhering silicon carbide particles according to the positions of diamond particles;

[0049] S4, filling alloy powder into the split graphite mold, assembling a graphite pressing block to extrude the alloy powder inside the split graphite mold;

[0050] S5. Place the split graphite mold containing the graphite compact, alloy powder, diamond particles and silicon carbide particles into an energy-saving thyristor medium frequency furnace KGBS-B for hot pressing and sintering. The hot pressing and sintering temperature is set to 980° C., the sintering pressure is set to 15 MPa, and the hot pressing and sintering time is set to 4 minutes to obtain a high-performance diamond drill bit suitable for hard rock drilling.

[0051] In the above materials, the number of diamond particles is 25, the volume concentration of diamond is 55%, the particle size of diamond is 30 / 35 mesh, the number of silicon carbide particles is 25, and the particle size of silicon carbide is 40 / 45 mesh;

[0052] In order to promote the exposure of diamonds and improve drilling efficiency, an appropriate proportion of weakened matrix particles - silicon carbide are added to the matrix. Silicon carbide particles have good hardness, brittleness and strength, and weak adhesion to the matrix. They will slowly fall off when worn, and will not fall off directly, which will reduce the holding force of the matrix on the diamond and increase the roughness of the bottom lip of the matrix. In addition, the silicon carbide abrasives remaining at the bottom of the hole grind the matrix and diamonds together with the rock cuttings, which improves the grinding performance of the rock cuttings, accelerates the metabolism of diamonds, and improves the rock breaking efficiency of the drill bit. Its concentration is 15%, the average particle size is 425μm, and the hardness of the matrix is ​​HRC15. This relatively low hardness impregnated drill bit is conducive to the diamond blade during drilling, thereby accelerating the drilling efficiency;

[0053] In order to increase the drilling life of the drill bit and avoid the risk of premature failure of the drill bit due to excessive wear of the inner and outer diameters, a double-layer arrangement of diamond polycrystals is used as a diameter maintenance method for the drill bit.

[0054] Example

[0055] Hard rock drilling experiments were conducted on diamond drill bits with silicon carbide particles added at different locations;

[0056] The test parameters are as follows: pressure of 0.4kN; rotation speed of 650r / min; time of 1min; clean water is used as flushing liquid and cooling liquid, and the flushing liquid volume is 40L / min. An electronic balance with an analytical accuracy of 0.01g is used to measure the weight of the sample and the aluminum oxide grinding wheel before and after wear, and the weight loss of the sample and the grinding wheel is calculated by the difference before and after. At the same time, each group of samples is tested 3 times and the average value is taken as the test value. Each group of samples needs to be uniformly sharpened before testing;

[0057] The SIRION field emission scanning electron microscope and energy spectrum analysis were used to observe the microscopic wear morphology of the sample and analyze the surface chemical composition. The high-power integrated video microscope SQ500MF was used to count the shedding rate of 25 diamonds in the matrix of the sample drill bit and observe and analyze the morphology of the wear debris;

[0058] Figure 1-3 The four graphs are the shedding rate of diamond per unit area, the weight loss graph of diamond drill bit, and the weight loss graph of grinding wheel;

[0059] The hard and brittle silicon carbide abrasive grains in the matrix of sample No. 1 do not contact with the diamonds. The diamond shedding rate in the matrix after crushing is about 28%, and the weight loss of the sample and the grinding wheel due to wear is 0.55g and 8.35g respectively.

[0060] The hard and brittle silicon carbide abrasive grains in the matrix of samples 2-4 are in contact with the diamonds;

[0061] Among them, the hard and brittle silicon carbide abrasive grains of sample No. 2 are located in front of the diamond along the cutting direction. The shedding rate of the diamond in the matrix after crushing is 32%, and the weight loss of the sample and the grinding wheel are 0.64g and 9.24g respectively. It can be seen that the wear weight loss values ​​of the sample and the grinding wheel of sample No. 2 and the diamond shedding rate are equivalent to those of sample No. 1. However, compared with sample No. 1, the wear weight loss of the grinding wheel of sample No. 2 increases, indicating that the cutting performance of the diamond in the matrix has been improved to a certain extent.

[0062] In the No. 3 sample, the hard and brittle silicon carbide abrasive grains are located behind the diamond along the cutting direction, and the diamond shedding rate is the highest, which is 52%, indicating that this distribution form has the strongest ability to promote the metabolism of diamond. Since the diamond and silicon carbide abrasive grains in the matrix of this test are distributed in a single layer, no new diamond particles are exposed in the matrix after the diamond falls off. If the diamond shedding rate is too high, the diamond protection will be lost, and the ability of the blank matrix to resist the wear of the grinding wheel will drop sharply, resulting in a significant increase in the wear weight loss of the matrix. Therefore, the matrix wear weight loss of No. 3 sample is the highest in this test, and the weight loss of the sample and the grinding wheel wear reaches 1.25g and 10.43g respectively.

[0063] In the No. 4 sample, the hard and brittle silicon carbide abrasive grains are located on the side of the diamond along the cutting direction. The diamond shedding rate in the matrix after crushing is 20%. The weight loss of the sample and the grinding wheel are 0.38g and 9.45g respectively. In this test, the diamond shedding rate under this distribution form is the lowest. The reason is that the matrix is ​​well protected by the diamond and has a strong ability to resist the wear of the grinding wheel. Therefore, the weight loss of the sample is also the lowest.

[0064] It is worth noting that the grinding wheel wear loss of sample No. 4 is greater than that of No. 1 and No. 2, indicating that the cutting performance of the diamond in the matrix is ​​also improved.

[0065] Figure 4 is the wear morphology of sample No. 1. Figure 5 and Figure 6It can be found that when the hard and brittle silicon carbide particles and diamonds do not come into contact with each other, there are shallow furrows on the surface of the matrix, the silicon carbide abrasive particles are distributed in a flat shape, and the wear mode is mainly micro-crushing;

[0066] Reference Fig.19 As shown in the figure, when the hard and brittle silicon carbide particles and diamonds do not come into contact with each other, the diamond drill bit will have a micro-pit effect during the drilling process. When drilling, the micro-pits on the surface of the matrix are conducive to the retention of rock powder at the bottom of the hole, which can indirectly create favorable conditions for the normal cutting of the diamond. In addition, the micro-crushed and detached hard and brittle silicon carbide auxiliary materials increase the solid phase components of the flushing fluid to a certain extent, improving the erosion and wear performance of the flushing fluid. However, it is worth mentioning that the hard and brittle silicon carbide auxiliary materials do not produce large-volume crushing and the volume concentration in the matrix is ​​limited. Therefore, the micro-pit effect has a very limited way of promoting the cutting performance of diamonds;

[0067] The micro-pit effect refers to the phenomenon that the silicon carbide auxiliary material is prone to micro-crushing and falling off during the drilling process of the diamond drill bit because there is no chemical bond or metallurgical bond between the silicon carbide auxiliary material and the matrix metal, resulting in randomly distributed micro-pits on the matrix surface.

[0068] Reference Fig. 20 As shown in the figure, when the hard and brittle silicon carbide auxiliary material is in contact with the diamond, and if it is located in front of the single diamond along the cutting direction, the diamond drill bit will experience local wear effect during the drilling process. The micro-crushing and shedding characteristics of the hard and brittle silicon carbide auxiliary material directly increase the front edge height of the single diamond in contact with it to a certain extent. In addition, the hard and brittle silicon carbide auxiliary material is blocked by the single diamond in contact with it, and its debris is easily enriched in the local area in front of the diamond, thereby promoting the wear degree of the matrix in this local area. If the hard and brittle silicon carbide abrasive grains are located on the side of the single diamond along the cutting direction, when they are crushed and shedding, on the one hand, it will directly increase the side edge height of the diamond; on the other hand, the micro-pits formed by silicon carbide are relatively concentrated in the blank area between two adjacent diamonds in the matrix, thereby affecting the three-body wear degree of the matrix in this local area, and causing the originally independent micro-pits in the matrix to interpenetrate to form continuous furrows. Therefore, the influence of local wear effect on diamond cutting performance is greater than that of micro-pit effect. In addition, since the local wear effect has little effect on the holding strength of the diamond in the matrix, it can also take into account the utilization rate of single diamond particles;

[0069] Reference Fig.21As shown in the figure, when the hard and brittle silicon carbide auxiliary material is in contact with the diamond and is located behind the single diamond along the cutting direction, the diamond drill bit will have a weakening effect of holding force during drilling. The fracture or shedding of the hard and brittle silicon carbide auxiliary material increases the cutting area of ​​the back of the diamond on the one hand, and also has a dragging effect on the diamond on the other hand. The above two effects reduce the holding force between the single diamond and the matrix, increase the probability of premature failure and force the new diamond in the matrix to force cutting. The premature failure and shedding of diamond effectively increases the grinding ability of rock powder, further aggravating the wear of the matrix. Therefore, the influence of the weakening effect of holding force on the cutting performance of single diamond is significantly higher than that of local wear effect and micro-pit effect. It is worth noting that the conventional diamond cutting achieved by synchronous wear of the matrix is ​​a continuous process, and the overall cutting height of the diamond is relatively uniform during the whole process. The diamond cutting achieved by the weakening effect of holding force is an instantaneous process, which can easily cause the diamond cutting height to increase suddenly in a short time. Therefore, this effect is most obvious in improving the drilling performance of the drill bit in hard, weakly abrasive and other complex special formations. However, since this effect reduces the utilization rate of single-grain diamond to a certain extent, if the concentration design is unreasonable, there is a disadvantage of reduced service life. The drilling performance is improved most obviously. However, since this effect reduces the utilization rate of single-grain diamond to a certain extent, if the concentration design is unreasonable, there is a disadvantage of reduced service life;

[0070] In summary, affected by the disordered distribution of hard and brittle silicon carbide auxiliary materials, the three effects produced by hard and brittle silicon carbide auxiliary materials in the actual working process synergistically affect the cutting performance of diamond in the matrix. When the concentration of hard and brittle silicon carbide auxiliary materials in the matrix is ​​low, it is relatively easy for them to be evenly distributed in the matrix. Therefore, there are fewer cases of mutual contact between them and diamonds. At this time, the effect of hard and brittle silicon carbide auxiliary materials on the cutting performance of diamonds is mainly micro-pit effect, supplemented by local wear effect; with the increase of silicon carbide concentration, the probability of mutual contact between silicon carbide and diamond in the matrix increases, gradually increasing the influence proportion of local wear and weakening holding force effect, combined with micro-pit effect to synergistically improve the cutting performance of diamonds; when the concentration exceeds the critical value, the probability of mutual contact between hard and brittle silicon carbide auxiliary materials and diamonds in the matrix increases significantly. At this time, the effect of hard and brittle silicon carbide auxiliary materials on the cutting performance of diamonds is mainly the weakening holding force effect and local wear effect;

[0071] from Figure 7 It can be found that the bonding part between silicon carbide abrasive grains and matrix does not form metallurgical bonding and there are obvious cracks, which makes the matrix weak in holding the silicon carbide abrasive grains. In addition, a large amount of white debris adheres to the micro-broken silicon carbide surface. The energy spectrum analysis shows that these white debris are mainly composed of Al and O elements. Therefore, it is preliminarily judged that they are wear debris of alumina grinding wheel.

[0072] The above phenomena all indicate that the micro-crushed silicon carbide abrasive grains can increase the roughness of the local matrix, capture the rock powder to a certain extent, increase the rock powder at the bottom of the hole, and create favorable conditions for the diamond to cut. Although the diamond in the matrix is ​​relatively complete in wear, the edges and corners are blunted and rounded, which has an adverse effect on the cutting performance and utilization rate of the diamond.

[0073] Figure 8 This is the tire wear morphology of sample No. 2. Figure 9-11 It can be found that when the silicon carbide abrasive grains come into contact with the diamond and are located in front of the diamond, there are different degrees of granular debris enrichment and aggravated wear of the matrix in the front area of ​​the diamond along the cutting direction. This is because the silicon carbide abrasive grains that are broken during the working process are easily blocked by the single diamond grains in contact with them, so that the broken particles and grinding debris are easily retained in the front of the diamond, thereby promoting the wear of the matrix in the local area. Therefore, compared with sample No. 1, the roughness of the matrix surface and the height of the diamond blade are increased. However, it is worth noting that the diamond in the matrix still has blunt and rounded edges, and there is no continuous plowing morphology on the surface of the matrix.

[0074] Fig.12 This is the tire wear morphology of sample No. 3. Figure 12-13 It can be seen that when the silicon carbide abrasive grains come into contact with the diamond and are located behind the diamond, the shedding rate of the diamond in the matrix increases significantly and no tadpole-shaped support morphology appears on its back; the phenomenon of large-scale crushing or fracture of the diamond in the matrix increases significantly, and a large amount of debris adheres to the surface of the crushed or fractured diamond. This is because the silicon carbide abrasive grains in this position are prone to cause the back support strength of the single diamond grain in contact with it to decrease, thereby reducing the holding force of the matrix on the single diamond grain. The previously worn, fallen and broken diamonds further increase the grinding ability of the rock chips, thereby aggravating the wear of the blank matrix that has lost the protection of the diamond.

[0075] Fig.14 and Fig.16 This is the tire wear morphology of sample No. 4. Fig.15 and Fig.17It can be found that when the silicon carbide abrasive grains and diamonds come into contact with each other and are located on the side of the diamond, a typical tadpole-shaped support morphology appears at the tail of the diamond in the matrix. This kind of diamond blade-out method helps to improve the holding force of the matrix on the diamond and improve the utilization rate of the diamond. Secondly, a deeper furrow morphology appears on the surface of the matrix. In the furrow area close to the diamond side, a large number of granular debris with band distribution and wear-damaged fall-off pits are enriched. The granular debris is mainly composed of C, O, Al, and Si elements according to the energy spectrum analysis. Therefore, it is preliminarily judged that it is broken silicon carbide abrasive grains and aluminum oxide grinding wheel debris. The wear morphology of the diamond is mainly micro-crushing, and the blade area and blade height are larger on the side close to the enrichment of granular debris.

[0076] The above phenomena can all indicate that under this distribution position state, on the one hand, the silicon carbide abrasive can use its crushing characteristics to directly increase the side edge height of the single-grain diamond in contact with it to a certain extent; on the other hand, the micro-pits formed by the crushing of the silicon carbide abrasive are relatively concentrated in the blank area between two adjacent diamonds. The blank area is prone to form a micro-pit group, causing the debris to be enriched in this local area, thereby aggravating the three-body wear of the matrix in this area. Therefore, the originally independent micro-pits are more likely to penetrate each other and form a continuous furrow shape, which is beneficial to increase the lip surface pressure of the drill bit, increase the cutting depth of the single-grain diamond and improve the diamond cutting performance.

[0077] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection claimed by the present invention is defined by the attached claims and their equivalents.

Claims

1. A high performance diamond drill bit suitable for hard rock drilling, characterized in that: The invention comprises the following components: 30% WC (tungsten carbide) powder, 50% 663Cu powder, 7% Co powder, 8% Ni powder and 5% Mn powder.

2. A high performance diamond drill bit suitable for hard rock drilling according to claim 1, characterized in that: The 663Cu powder includes the following components: 85% Cu, 6% Sn, 6% Zn and 3% Pb.

3. A method for preparing a high-performance diamond drill bit suitable for hard rock drilling, characterized in that: The steps include: S1. Evenly mix WC powder, 663Cu powder, Co powder, Ni powder and Mn powder by a mixer to obtain alloy powder; S2, adhering a thermosensitive adhesive to the bottom mold of the split graphite mold, placing diamond particles on the bottom mold, and obtaining the position of the diamond particles; S3, adhering silicon carbide particles according to the positions of diamond particles; S4, filling alloy powder into the split graphite mold, assembling a graphite pressing block to extrude the alloy powder inside the split graphite mold; S5. Place the split graphite mold containing graphite compacts, alloy powders, diamond particles and silicon carbide particles into the energy-saving thyristor medium-frequency furnace KGBS-B for hot pressing and sintering to obtain a high-performance diamond drill bit suitable for hard rock drilling.

4. The method for preparing a high-performance diamond drill bit suitable for hard rock drilling according to claim 3, characterized in that: The number of diamond particles used in preparing the high-performance diamond drill bit is 25.

5. The method for preparing a high-performance diamond drill bit suitable for hard rock drilling according to claim 4, characterized in that: The volume concentration of diamond is 55%.

6. The method for preparing a high-performance diamond drill bit suitable for hard rock drilling according to claim 5, characterized in that: The diamond has a particle size of 30 / 35 mesh.

7. The method for preparing a high-performance diamond drill bit suitable for hard rock drilling according to claim 3, characterized in that: The number of silicon carbide grains used in preparing the high-performance diamond drill bit is 25 grains.

8. The method for preparing a high-performance diamond drill bit suitable for hard rock drilling according to claim 6, characterized in that: The particle size of the silicon carbide is 40 / 45 mesh.

9. The method for preparing a high-performance diamond drill bit suitable for hard rock drilling according to claim 3, characterized in that: The mixer adopts HL10 mixer to mix the powders evenly, and the mixing time is set to 6 hours.

10. The method for preparing a high-performance diamond drill bit suitable for hard rock drilling according to claim 4, characterized in that: The hot pressing sintering temperature is set to 980° C., the sintering pressure is set to 15 MPa, and the hot pressing sintering time is set to 4 minutes.

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