Alloy matrix repairing device of polycrystalline diamond compact

Abstract

The utility model discloses an alloy matrix repairing device for a polycrystalline diamond compact, which is characterized in that the damaged polycrystalline diamond compact is arranged in a graphite pipe with an upper opening and a lower opening, and required metal powder is filled in a gap between the damaged polycrystalline diamond compact and the graphite pipe; graphite pressing columns are arranged at the upper opening and the lower opening of the graphite pipe; the upper graphite pressing column and the lower graphite pressing column are matched with the graphite pipe to press the damaged polycrystalline diamond compact and the filled metal powder; the graphite pipe is arranged in a pyrophyllite sleeve with an upper opening and a lower opening, a graphite sheet, an iron sheet and a pyrophyllite plug are sequentially arranged at the upper opening and the lower opening of the pyrophyllite sleeve from inside to outside, and the graphite sheet is tightly attached to the graphite pressing column. According to the repairing device, the damaged alloy matrix of the polycrystalline diamond compact can be repaired, the polycrystalline diamond compact can be reused, the replacement rate is reduced, and the cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of polycrystalline diamond composite sheets, in particular to an alloy matrix repairing device for a polycrystalline diamond composite sheet. Background Art

[0002] In geological drilling, coal drilling and oil and gas drilling, polycrystalline diamond composite (PDC) drill bits have become one of the most commonly used rock breaking tools due to their excellent rock cutting speed and long service life. At present, the common situation in the market is that after use, the PDC composite bit itself has continued use value, but it cannot be used due to the damage of its alloy matrix, that is, the diamond layer 1 on the damaged alloy matrix 2 is intact, such as Figure 1 As shown in the figure, this leads to low reuse rate of composite sheets, high consumption of resource materials and high overall cost. Utility Model Content

[0003] In view of the deficiencies existing in the prior art, the utility model provides an alloy matrix repairing device for a polycrystalline diamond composite sheet.

[0004] The utility model discloses an alloy matrix repair device for a polycrystalline diamond composite sheet, comprising:

[0005] The broken polycrystalline diamond composite sheet is placed in a graphite tube with upper and lower openings, and the gap between the broken polycrystalline diamond composite sheet and the graphite tube is filled with the required metal powder;

[0006] Graphite pressure columns are provided at the upper and lower openings of the graphite tube, and the upper and lower graphite pressure columns cooperate with the graphite tube to press the damaged polycrystalline diamond composite sheet and the filled metal powder;

[0007] The graphite tube is placed in a pyrophyllite sleeve with upper and lower openings. The upper and lower openings of the pyrophyllite sleeve are provided with graphite sheets, iron sheets and pyrophyllite plugs in sequence from inside to outside. The graphite sheets are closely attached to the graphite pressure column.

[0008] As a further improvement of the utility model, the diamond layer of the damaged polycrystalline diamond composite sheet is bonded to the graphite pressure column on the corresponding side.

[0009] As a further improvement of the utility model, the metal powder covers the outer surface of the alloy substrate of the polycrystalline diamond composite sheet.

[0010] As a further improvement of the utility model, the upper surface of the upper graphite pressure column is not lower than the upper surface of the graphite tube, and the lower surface of the lower graphite pressure column is not higher than the lower surface of the graphite tube.

[0011] As a further improvement of the utility model, four ejector heads of the six-sided top press act on four side surfaces of the square pyrophyllite sleeve, and the other two ejector heads of the six-sided top press act on the pyrophyllite plug.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] The repairing device of the utility model can repair the damaged alloy matrix of the polycrystalline diamond composite sheet, so that the polycrystalline diamond composite sheet can be reused, thereby reducing the replacement rate and the cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic diagram of the structure of a damaged polycrystalline diamond composite sheet;

[0015] Figure 2 It is a structural schematic diagram of the alloy matrix repair device of the polycrystalline diamond composite sheet disclosed in the utility model;

[0016] Figure 3 This is a schematic diagram of the rough structure of the repaired polycrystalline diamond composite sheet of the utility model;

[0017] Figure 4 This is a finished product picture of the polycrystalline diamond composite sheet after repair by the utility model.

[0018] In the figure:

[0019] 1. Diamond layer; 2. Damaged alloy matrix; 3. Metal powder; 4. Graphite tube; 5. Graphite pressure column; 6. Graphite sheet; 7. Iron sheet; 8. Pyrophyllite sleeve; 9. Pyrophyllite plug. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] The utility model is further described in detail below in conjunction with the accompanying drawings:

[0022] like Figure 2 As shown, the utility model provides an alloy matrix repair device for a polycrystalline diamond composite sheet, comprising: metal powder 3, a graphite tube 4, a graphite pressure column 5, a graphite sheet 6, an iron sheet 7, a pyrophyllite sleeve 8 and a pyrophyllite plug 9; wherein,

[0023] The damaged polycrystalline diamond composite sheet is placed in a graphite tube 4 with upper and lower openings, and the required metal powder 3 is filled in the gap between the damaged polycrystalline diamond composite sheet and the graphite tube 4, and the metal powder 3 covers the outer surface of the damaged alloy matrix 2 of the polycrystalline diamond composite sheet; the metal powder 3 is reasonably selected according to the alloy matrix of the polycrystalline diamond composite sheet to be repaired. An embodiment is: the formula of the metal powder 3 is: 0-70wt% tungsten carbide; 0-5wt% phosphorus; 3-20wt% iron; 3-20wt% Cobalt; 3-40wt% nickel; 10-60wt% copper; graphite pressure columns 5 are provided at the upper and lower openings of the graphite tube 4, the diamond layer 1 of the damaged polycrystalline diamond composite sheet is bonded to the graphite pressure column 5 on the corresponding side, such as the diamond layer 1 is bonded to the graphite pressure column 5 on the lower side; the upper and lower graphite pressure columns 5 cooperate with the graphite tube 4 to press the damaged polycrystalline diamond composite sheet and the filled metal powder 3, the upper surface of the upper graphite pressure column is not lower than the upper surface of the graphite tube, and the lower surface of the lower graphite pressure column is not higher than the lower surface of the graphite tube. The graphite tube 4 is placed in a pyrophyllite sleeve 8 with upper and lower openings. The upper and lower openings of the pyrophyllite sleeve 8 are provided with a graphite sheet 6, an iron sheet 7 and a pyrophyllite plug 9 from the inside to the outside. The middle of the pyrophyllite plug 9 is provided with a steel bowl connected to the iron sheet, and the steel bowl directly fits the hammer face of the six-sided hammer hydraulic press; the graphite sheet 6 is close to the graphite pressure column 5; the four ejector heads of the six-sided top press act on the four sides of the square pyrophyllite sleeve, and the other two ejector heads of the six-sided top press act on the steel bowl of the pyrophyllite plug 8.

[0024] Based on the above alloy matrix repair device, the utility model provides an alloy matrix repair method for a polycrystalline diamond composite sheet, comprising:

[0025] S1. Use a centerless grinder to remove the brazing material on the surface of the polycrystalline diamond composite sheet to be repaired, and then use ultrasonic cleaning for a cleaning time of more than 10 minutes. After cleaning, dry the surface moisture;

[0026] S2, bonding the diamond layer 1 of the polycrystalline diamond composite sheet to the surface of a graphite pressure column 5; wherein the diamond layer of the polycrystalline diamond composite sheet is bonded to the surface of a graphite pressure column by glue, and the glue may meet the following conditions: it can be evaporated and removed before 500°C;

[0027] S3, inserting the graphite pressure column 5 bonded with the polycrystalline diamond composite sheet into one end of the graphite tube 4;

[0028] S4, loading metal powder 3 from the other end of the graphite tube, so that the metal powder fills the gap between the polycrystalline diamond composite sheet and the graphite tube and covers the outer surface of the alloy matrix 2 of the polycrystalline diamond composite sheet;

[0029] S5. After the metal powder 3 is loaded, another graphite pressure column 5 is loaded at the other end of the graphite tube to form an assembly block;

[0030] S6, placing the first assembly block into the pyrophyllite sleeve 8, and sequentially placing the graphite sheet 6, the iron sheet 7 and the pyrophyllite plug 9 at both ends of the first assembly block to obtain a final assembly;

[0031] S7. Place the six faces of the assembly into a six-sided press corresponding to each other for high-temperature and high-pressure synthesis repair; wherein the process parameters of high-temperature and high-pressure synthesis are: pressure range of 2-10 GPa, applied voltage range of (12000 / 3000) V to (21000 / 3000) V, synthesis temperature of 800-2000°C, and synthesis time of 10-500s; further preferably: pressure range of 7 GPa, applied voltage range of (15350 / 3000) V, synthesis temperature of 1200°C, and synthesis time of 59s.

[0032] S8. After the high temperature and high pressure synthesis repair is completed, a polycrystalline diamond composite blank is obtained, such as Figure 3 As shown;

[0033] S9, use a centerless grinder to remove excess metal from the outer layer of the PCD composite blank to obtain the repaired finished product, such as Figure 4 shown.

[0034] The advantages of the utility model are:

[0035] The repair device of the utility model can repair the damaged alloy matrix of the polycrystalline diamond composite sheet, so that the polycrystalline diamond composite sheet can be reused, the replacement rate is reduced, and the cost is reduced;

[0036] The utility model uses graphite with high temperature resistance, electrical and thermal conductivity, and chemical stability as the graphite mold for molding, which improves the quality of repair. Among them: graphite has no melting point at room temperature, and the temperature at which it starts to sublimate is 3620K; graphite has high thermal conductivity and anisotropy; the thermal expansion coefficient of graphite single crystal has obvious anisotropy. The more complete the crystal structure, the more obvious the anisotropy;

[0037] The utility model can be repaired and adjusted according to different hardness and material requirements of the polycrystalline diamond composite sheet.

[0038] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A polycrystalline diamond composite sheet alloy matrix repair device, characterized in that: The broken polycrystalline diamond composite sheet is placed in a graphite tube with upper and lower openings, and the gap between the broken polycrystalline diamond composite sheet and the graphite tube is filled with the required metal powder; Graphite pressure columns are provided at the upper and lower openings of the graphite tube, and the upper and lower graphite pressure columns cooperate with the graphite tube to press the damaged polycrystalline diamond composite sheet and the filled metal powder; The graphite tube is placed in a pyrophyllite sleeve with upper and lower openings. The upper and lower openings of the pyrophyllite sleeve are provided with graphite sheets, iron sheets and pyrophyllite plugs in sequence from inside to outside. The graphite sheets are closely attached to the graphite pressure column.

2. The alloy matrix repair device according to claim 1, characterized in that: The diamond layer of the damaged polycrystalline diamond composite sheet is bonded to the graphite pressure column on the corresponding side.

3. The alloy matrix repairing device according to claim 2, characterized in that: The metal powder covers the outer surface of the alloy substrate of the polycrystalline diamond compact.

4. The alloy matrix repairing device according to claim 1, characterized in that: The upper surface of the upper graphite pressure column is not lower than the upper surface of the graphite tube, and the lower surface of the lower graphite pressure column is not higher than the lower surface of the graphite tube.

5. The alloy matrix repairing device according to claim 1, characterized in that: The four ejector heads of the six-sided top press act on the four sides of the square pyrophyllite sleeve, and the other two ejector heads of the six-sided top press act on the pyrophyllite plug.

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