CN111822715A - High-wear-resistance diamond-impregnated bit matrix material and method for manufacturing diamond bit by using same - Google Patents
High-wear-resistance diamond-impregnated bit matrix material and method for manufacturing diamond bit by using same Download PDFInfo
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- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
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- 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
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- 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
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- B22F3/14—Both compacting and sintering simultaneously
- B22F3/15—Hot isostatic pressing
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/008—Ferrous alloys, e.g. steel alloys containing tin
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Abstract
The invention provides a high-wear-resistance diamond-impregnated bit matrix material and diamond manufactured by using the sameThe method of the drill bit comprises the following components by weight percent: FAM-1020 (Fe)80Ni18Co2) 42-56% of FAM-3010 (Fe)81Ni7Mn12) 16-22% of FAM-2120 (Fe)85Ni6Cu6Sn3) 28-36% and inevitable impurities. The manufacturing method comprises the following steps: heating the matrix material; carrying out low-pressure sintering treatment on the matrix material; cooling the matrix material to room temperature; carrying out hot isostatic pressing treatment on the diamond-impregnated bit blank; and cooling to room temperature. According to the diamond-impregnated bit matrix, the diamond-impregnated bit matrix material components are reasonably designed, and a special low-pressure sintering and hot isostatic pressing manufacturing method matched with the components is adopted, so that the wear resistance and the comprehensive mechanical property of the diamond-impregnated bit matrix are effectively improved, and the drilling target with high efficiency and long service life can be realized.
Description
Technical Field
The invention belongs to the technical field of geological exploration and drilling engineering, and particularly relates to a high-wear-resistance diamond-impregnated bit matrix material and a method for manufacturing a diamond bit by using the same.
Background
With the rapid development of geological exploration, shale gas new energy exploration and geothermal exploration and the rapid development of deep drilling and deep geological research, the rock grade change of drilling is large, the lithology is complex, and a high-performance diamond drill bit is required to adapt to the rapid change; particularly, the deep rock stratum has high hardness, strong abrasiveness, fast abrasion of the drill bit, short service life of the drill bit and higher frequency of replacing the drill bit, and the drilling frequency is obviously increased under the condition of the drilling, so that the drilling construction cost is high. The performance and quality of diamond drill bits are closely related to the composition of the drill bit raw materials and the method and process parameters for manufacturing the drill bits.
At present, the methods for manufacturing the diamond-impregnated bit which are still applied mainly comprise a hot pressing method, an electroplating method, a pressureless dipping method, a brazing method and the like, but all have different defects.
The hot pressing method is the main method for manufacturing the diamond-impregnated bit at present, and mainly adopts a medium-frequency electric furnace and a resistance furnace for hot pressing sintering; the required pressure is generally 14-18 MPa; the required sintering temperature is generally within the range of 940-980 ℃; the heat preservation time is 3.0-6.0 min. Under the conditions of the hot pressing process and parameters, the matrix of the drill bit can only adopt a lower content of framework materials (WC and YG8) and a certain content of single metal materials such as Fe, Ni, Mn, Co, Cr and the like, and meanwhile, a higher content of bonding metal materials (Cu-Sn, Cu-Sn-Zn alloy and the like) must be prepared. However, the physical and mechanical properties of the traditional carcass material are greatly different, the hardest material with the highest melting point is the framework material (WC, YG8), and the softest material with the lowest melting point is the Cu-Sn or Cu-Sn-Zn alloy material; the metal materials with greatly different physical and mechanical properties form a tire body material system, the expected tire body performance is difficult to achieve under the condition of traditional hot pressing process parameters, and the hot pressing process parameters are difficult to reasonably design and optimize. When the temperature and the pressure are high, the sintering of framework materials WC, YG8 and metals such as Fe, Ni, Mn, Co and the like is facilitated, but the sintering of the Cu alloy is not facilitated, the melting point of the Cu alloy is low, the loss after melting is increased, and the components and the performance of a matrix of the drill bit can be changed; when the low-temperature and pressure sintering is adopted, although the Cu alloy hot-pressing sintering is beneficial, the requirements on the overall mechanical property of the matrix are difficult to achieve, and the hardness and the wear resistance of the drill bit are difficult to meet the requirements. Therefore, the difficulty of designing hot pressing process parameters for the matrix material of the traditional diamond-impregnated bit is high, the optimization design is more difficult, and the quality of the bit is difficult to stabilize and grasp. It is difficult to manufacture diamond-impregnated bits having universal properties and the range of use of the bits is limited.
The manufacturing of the diamond-impregnated bit by the electroplating method is original in China, but the production period is long, and generally 8-10 days are a period; a pinhole is inevitably formed in the matrix of the drill bit, so that the compactness and the wear resistance of the drill bit are greatly reduced; and simultaneously, the diameter protection effect of the electroplated diamond-impregnated bit is not ideal. Therefore, the method is not suitable for deep drilling and wire line core drilling, and the application range is limited. The diamond bit manufactured by the brazing method is sometimes used for manufacturing a surface-inlaid diamond bit, and the manufactured diamond-impregnated bit has the greatest defects that the diamond edge is difficult to emerge during drilling and the drilling efficiency is low; meanwhile, the manufactured diamond drill bit is not standard and has low precision; the defects are not effectively improved and broken through so far, and cannot be popularized and applied.
The analysis shows that the manufacturing methods of the common diamond-impregnated bit have the advantages but are obviously insufficient, and the process parameters and the current situation of the matrix material of the bit become the key for restricting the performance and the quality of the diamond-impregnated bit and become the bottleneck for restricting the efficient and long-life drilling of the diamond-impregnated bit. Therefore, the advantages of the various methods must be combined to find the breakthrough from the matrix material system and the manufacturing method and process technology matched with the matrix material system to achieve the ideal target.
Disclosure of Invention
The invention provides a high-wear-resistance diamond-impregnated bit matrix material and a method for manufacturing a diamond bit by using the same.
In order to achieve the aim, the high-wear-resistance diamond-impregnated bit matrix material comprises the following components in percentage by weight: FAM-1020 (Fe)80Ni18Co2) 42-56% of FAM-3010 (Fe)81Ni7Mn12) 16-22% of FAM-2120 (Fe)85Ni6Cu6Sn3) 28-36% and inevitable impurities.
Preferably, the high-wear-resistance diamond-impregnated bit matrix material comprises the following components in percentage by weight: 47-52% of FAM-1020, 18-20% of FAM-3010 and 31-33% of FAM-2120.
Preferably, the granularity of each component of the high-wear-resistance diamond-impregnated bit matrix material is 320-400 meshes.
The invention also provides a method for manufacturing the diamond-impregnated bit by using the high-wear-resistance diamond-impregnated bit matrix material, which comprises the following steps:
1) heating the matrix material to 650-700 ℃ at a speed of 90-115 ℃/min;
2) pressurizing and continuously heating to perform low-pressure sintering treatment on the matrix material, wherein the sintering temperature is 950-970 ℃, the pressure is 9-12 MPa, and the heat preservation and pressure maintaining are performed for 3.0-5.0 min;
3) cooling the matrix material to room temperature to form a diamond-impregnated bit blank;
4) carrying out hot isostatic pressing treatment on the diamond-impregnated bit blank, wherein the hot isostatic pressing treatment temperature is 1150-1320 ℃, the pressure is 75-110 MPa, and the heat preservation and pressure maintaining are carried out for 0.5-1.5 h;
5) cooling to room temperature and discharging to obtain the diamond-impregnated bit.
Preferably, in the step 1), during the temperature rise, the temperature rise speed is 90-95 ℃/min for the first 0-5 min, and the temperature rise speed is 100-115 ℃/min for the later.
Further preferably, in step 2), when the diamond-impregnated bit blank is subjected to low-pressure sintering treatment, the density of the blank is controlled to be greater than or equal to 94% of the theoretical density.
Preferably, in the step 3), when the carcass material is cooled, the carcass material is cooled to 450-550 ℃ along with the furnace, and then taken out of the furnace and cooled to room temperature.
Further preferably, in the step 4), during the hot isostatic pressing treatment, the diamond-impregnated bit blank formed by low-pressure sintering can directly enter a hot isostatic pressing furnace, the hot isostatic pressing furnace is firstly vacuumized and filled with inert gas, and then the pressure in the furnace is increased and the temperature is raised to a set value.
The high-wear-resistance diamond-impregnated bit of the invention selects prealloy powder FAM-1020 (Fe) from the selection of material components80Ni18Co2)、FAM-3010(Fe81Ni7Mn12) And FAM-2120 (Fe)85Ni6Cu6Sn3) As a hard binding material, the wear-resistant hard binding material can replace high-price metal cobalt, and has high wear resistance and low cost. The three kinds of superfine pre-alloy powder have good complementary action in the drill bit matrix, and the three kinds of pre-alloy powder have good affinity with diamond, so that the drill bit matrix has the function of improving the comprehensive mechanical strength, can effectively bond and wrap the diamond, ensures that the diamond can be exposed properly along with the abrasion of the matrix, and well considers the characteristics of high drilling timeliness and long service life. Under the hot isostatic pressing condition, the diamond can have strong interaction with the diamond, and effective fusion is realized. Meanwhile, the invention also discloses a tire of the diamond-impregnated drill bitNo WC and YG8 skeleton materials are added in the body, so that under the physical and chemical action of the hot isostatic pressing process conditions, the bit matrix can not only play a role in supporting the skeleton materials and bear the drilling pressure applied in the drilling process, and the hardness, the wear resistance and the comprehensive mechanical property of the diamond-impregnated bit matrix can be ensured.
Correspondingly, aiming at the raw material components specially selected and matched, the manufacturing method adopts a low-pressure sintering and hot isostatic pressing process, and the theoretical basis is as follows:
low pressure sintered charges are loose-packed without pressure, during which air is entrained in the metal powder. The low-pressure sintering process is that the temperature is increased firstly and then the pressure is increased, so that the air remained in the metal powder is pre-oxidized at the initial stage of low-pressure sintering, and the effect of activated sintering is substantially achieved; the activation sintering and the low pressure heating are beneficial to improving the compactness and the homogeneity of the matrix (namely the drill bit blank) of the diamond-impregnated drill bit.
The Hot Isostatic Pressing (HIP) method is mainly used in the application fields of hot isostatic pressing connection, integral forming of complex parts, densification treatment of castings and the like. Hot isostatic pressing, also known as "gas pressure bonding," takes castings of iron, aluminum, etc. as an example, and the castings can be densified by 100% after hot isostatic pressing. A large number of researches show that hot isostatic pressing can eliminate the internal pores of the castings and the sintered parts, improve the tissue structures of the castings and the sintered parts and improve the overall mechanical property. At present, no precedent for manufacturing the diamond-impregnated bit by adopting a hot isostatic pressing method exists. The present invention selects a hot isostatic pressing process for manufacturing diamond-impregnated bits for a particular selected raw material composition. Vacuum is filled in the hot isostatic pressing furnace, inert gas is filled, thermal corrosion to diamond is reduced to be close to zero at high temperature, chemical combination of the diamond and iron group elements in the matrix material is facilitated, the strength of the matrix embedded with the diamond is improved, and the service life of the drill bit is prolonged; meanwhile, the ultrahigh temperature and ultrahigh pressure effects on a drill bit blank can be greatly improved, the relative sliding, crushing and plastic deformation of powder particles are improved, the rearrangement and volume diffusion mechanism of the particles is accelerated, and the densification process of a matrix is accelerated, so that the interaction and effective fusion between metal powder and between the metal powder and diamond are greatly enhanced, the loss or segregation of bonding metal cannot occur, the matrix of the designed drill bit is favorable for realizing stable mechanical property and compact and uniform tissue structure, and the capability of diamond-impregnated drill bit for crushing rocks is improved.
The manufacturing method of the invention adopts a low-pressure sintering method to manufacture a diamond-impregnated bit blank (a non-regular bit), when the blank is cooled along with a furnace, the thermal stress of a bit matrix is mostly released, the fusion and embedding of matrix metal to diamond tend to be completed, and the organization structure of the matrix is basically formed; but the pores in the matrix are not eliminated, and the densification is still to be perfected; the hardness, the wear resistance and other mechanical properties of the matrix far do not meet the requirements of the high-wear-resistance diamond-impregnated bit, and effective drilling conditions are not met. And a hot isostatic pressing procedure is carried out on the basis, so that the plastic deformation of the metal powder particles of the matrix can be better enhanced, the diffusion mechanism of the powder particles can be effectively carried out, the pores are further rounded, the porosity is further reduced, the matrix structure of the drill bit is more compact, and the performance of the drill bit is greatly improved. In addition, the blank body of the diamond-impregnated bit with required performance, standard size and high precision can be prepared by low-pressure sintering; more significantly, the drill blank may be fed directly into the hot isostatic pressing furnace without the need for a special capsule designed and required for processing conventional hot isostatic presses. The inert gas in the hot isostatic pressing furnace is used as a pressure transmission medium for transmitting pressure, so that the hot isostatic pressing procedure is realized, the process for manufacturing the diamond-impregnated bit can be obviously simplified, and the manufacturing cost of the diamond-impregnated bit is reduced.
The matrix of the drill bit does not contain Cu-Sn alloy or Cu-Sn-Zn alloy which is necessary when the diamond-impregnated bit is manufactured by a common hot pressing method and a non-pressure impregnation method, so that the matrix metal material is favorable for realizing solid-phase sintering molding under the conditions of ultra-high temperature and ultra-high pressure of hot isostatic pressing, not only is the strength of the diamond coated on the matrix of the drill bit high, but also the wear resistance of the diamond-impregnated bit is high, and meanwhile, the diamond edge cutting effect is good, the frictional wear mechanism between the matrix and rock is qualitatively changed, the bit matrix can be slightly worn in advance by the diamond, the timely and effective edge cutting of the diamond is ensured, the drilling speed is high and stable, and meanwhile, the service life of the drill bit is; these properties are not achievable with diamond-impregnated bits made by conventional hot pressing methods and other methods such as pressureless impregnation.
After the technology of low-pressure sintering and hot isostatic pressing is adopted, the diamond in the matrix of the drill bit is preliminarily detected, and an MeC layer, namely a C-MeC-Me combined transition layer, appears on the surfaces of matrix metal and the diamond, so that the chemical combination of the diamond and matrix metal materials is realized, the combination strength can be greatly improved, the mechanical embedding combination is not always considered, and the cognition of the traditional concept is changed. This creates excellent conditions for improving the wear resistance of diamond-impregnated bits and improving the service life of diamond-impregnated bits. Practice proves that the diamond drill bit manufactured by the method has high wear resistance, the diamond in the drill bit has good edge, the universal performance has obvious advantages, and the drilling target with high efficiency and long service life can be realized; therefore, the drilling machine can improve the bench-moon efficiency by 16-18%, the drilling aging is improved by about 18-20%, the service life of the drill bit is improved by 30-35%, the unit footage cost of the drill bit is reduced by 10-15%, and the drilling economic and technical indexes are obviously improved.
Detailed Description
The high wear-resistant diamond-impregnated bit matrix material and the method for manufacturing a diamond bit using the same according to the present invention will be further described with reference to the following embodiments.
Example 1
The high-wear-resistance diamond-impregnated bit matrix material comprises the following components in percentage by weight: prealloying powder FAM-1020, FAM-3010 and FAM-2120, wherein the weight percentages are 48%, 24% and 28% respectively; the three components are 320-400 mesh ultrafine powder.
Designing and preparing diamond and the pre-alloyed powder required by manufacturing the drill bit, and carrying out ball milling and mixing on the matrix material to ensure that the diamond is uniformly distributed in the metal powder for later use; wherein the selected diamond parameters are: the granularity of 30/40 meshes accounts for 65%, and the granularity of 40/50 meshes accounts for 35%; the concentration (i.e. the dosage) of the diamond is 11.5 percent of the weight of the pre-alloyed powder of the drill bit matrix; the diamond grades are all MBD40 type.
The method for manufacturing the diamond-impregnated bit by adopting the low-pressure sintering and the hot isostatic pressing comprises the following steps of:
1) loading the uniformly mixed matrix material into a mold according to requirements, placing the mold in a hot-pressing sintering furnace, heating the material at a speed of 90 ℃/min for the first 5min, and then heating at a speed of 100 ℃/min; the temperature is raised to 650 ℃;
2) pressurizing the hot-pressing sintering furnace, continuously heating to perform low-pressure sintering treatment at 955 ℃ under 11MPa, and keeping the temperature and pressure for 4.5 min;
3) cutting off power, firstly cooling the material to 450 ℃ along with the furnace, discharging the material, then cooling the material outside the furnace to room temperature to form a diamond-impregnated bit blank, and testing that the density of the diamond-impregnated bit blank is not lower than 95% of the theoretical density;
4) sending the diamond-impregnated bit blank sintered at low pressure into a hot isostatic pressing furnace, stably and uniformly placing the blank, reserving a proper space in the furnace, carrying out hot isostatic pressing treatment on the diamond-impregnated bit blank, firstly vacuumizing the hot isostatic pressing furnace, filling inert gas nitrogen, then starting a high-pressure air pump for pressurization, and electrifying and heating when the pressure reaches 65% of a design pressure value; when the temperature and the pressure reach preset values, entering a hot isostatic pressing procedure; hot isostatic pressing process parameters: the preset temperature is 1200 ℃, and the preset pressure is 90 MPa; when the preset temperature and pressure are reached, preserving heat and maintaining pressure for 45 min;
5) and (3) cutting off power, cooling and depressurizing the drill bit along with the furnace, cooling to room temperature along with the furnace, discharging, and mechanically processing and decorating the formed diamond-impregnated drill bit to obtain the diamond-impregnated drill bit manufactured by the non-pressure and hot isostatic pressing method.
For the diamond-impregnated bit obtained in this example, the matrix density of the diamond-impregnated bit was detected to reach 99.8%. The tension ring is utilized to detect the strength of the diamond-impregnated bit matrix made by the method, and the strength is improved by about 38% compared with the strength of the diamond-impregnated bit matrix made of the same matrix material by adopting a common hot pressing method; testing the hardness of the drill bit matrix to HRC56 by using an HR-150A hardness tester; by usingThe wear resistance of the MPx-2000 friction wear testing machine is 13 mg; this is a performance index that cannot be achieved by ordinary hot press drills. The drill bit andsame mine areaCompared drilling tests are carried out on the commercially available diamond drill bit, the drilling efficiency of the drill bit manufactured in the trial mode is improved by 9%, and the service life of the drill bit is prolonged by about 30%.
Example 2
The high-wear-resistance diamond-impregnated bit matrix material comprises the following components in percentage by weight: prealloying powder FAM-1020, FAM-3010 and FAM-2120, wherein the weight percentages are 42%, 26% and 32% respectively; all three components are 320-400 mesh ultrafine powder;
designing and preparing diamond and the pre-alloyed powder required by manufacturing the drill bit, and carrying out ball milling and mixing on the matrix material to ensure that the diamond is uniformly distributed in the metal powder for later use; wherein the selected diamond parameters are: the granularity of 30/40 meshes accounts for 60%, and the granularity of 40/50 meshes accounts for 40%; the concentration (i.e. the dosage) of the diamond is 12 percent of the weight of the pre-alloyed powder of the drill bit matrix; the diamond grades are all MBD40 type;
the method for manufacturing the diamond-impregnated bit by adopting the low-pressure sintering and the hot isostatic pressing comprises the following steps of:
1) loading the uniformly mixed matrix material into a mold according to requirements, placing the mold in a hot-pressing sintering furnace, heating and pressurizing the material, wherein the heating speed is 95 ℃/min in the first 4min, and then heating to the set temperature at the speed of 105 ℃/min; the temperature is raised to 700 ℃;
2) pressurizing the hot-pressing sintering furnace and continuously heating for low-pressure sintering treatment, wherein the sintering temperature is 965 ℃, the pressure is 10MPa, and the heat preservation and pressure maintaining time is 4.0min
3) Cutting off power, cooling the material to 500 ℃ with the furnace, discharging, cooling to room temperature outside the furnace to form a diamond-impregnated bit blank, and demolding; testing that its density should not be less than 95% of theoretical density;
4) sending the diamond-impregnated bit blank sintered at low pressure into a hot isostatic pressing furnace, stably and uniformly placing the blank, reserving a proper space in the furnace, carrying out hot isostatic pressing treatment on the diamond-impregnated bit blank, firstly vacuumizing the hot isostatic pressing furnace, filling inert gas nitrogen, then starting a high-pressure air pump for pressurization, and electrifying and heating when the pressure reaches 70% of a design pressure value; when the temperature and the pressure reach preset values, entering a hot isostatic pressing procedure; hot isostatic pressing process parameters: the preset temperature is 1280 ℃, and the preset pressure is 98 MPa; when the preset temperature and pressure are reached, preserving heat and maintaining pressure for 1.0 h;
5) and (3) cutting off power, cooling and depressurizing the drill bit along with the furnace, cooling to room temperature along with the furnace, discharging, and mechanically processing and decorating the formed diamond-impregnated drill bit to obtain the diamond-impregnated drill bit manufactured by the non-pressure and hot isostatic pressing method.
For the diamond-impregnated bit obtained in this example, the matrix density of the diamond-impregnated bit was detected to reach 99.9%. The tension ring is utilized to detect the strength of the diamond-impregnated bit matrix made by the method, and the strength is improved by about 40% compared with the strength of the diamond-impregnated bit matrix made of the same matrix material by adopting a common hot pressing method; testing the hardness of the drill bit matrix to HRC57 by using an HR-150A hardness tester; testing the wear resistance of 12mg by using an MPx-2000 friction wear testing machine; this is a performance index that cannot be achieved by ordinary hot press drills. The drill bit andsame mine areaThe commercial diamond drill bit carries out contrast drilling test, and the drilling efficiency of the drill bit trial-manufactured is improved by 8%, and the service life of the drill bit is improved by about 31%.
Example 3
The high-wear-resistance diamond-impregnated bit matrix material comprises the following components in percentage by weight: prealloying powder FAM-1020, FAM-3010 and FAM-2120, wherein the weight percentages are 54%, 18% and 28% respectively; the three components are 320-400 mesh ultrafine powder.
Designing and preparing the diamond and the prealloyed powder required by manufacturing the drill bit; performing ball milling and mixing on the matrix material to ensure that the diamonds are uniformly distributed in the metal powder for later use; wherein the selected diamond parameters are: 55 percent of 30/40 meshes and 45 percent of 40/50 meshes; the concentration (i.e. the dosage) of the diamond is 12.5 percent of the weight of the pre-alloyed powder of the drill bit matrix; the diamond grades are all MBD40 type;
the method for manufacturing the diamond-impregnated bit by adopting the low-pressure sintering and the hot isostatic pressing comprises the following steps of:
1) loading the uniformly mixed matrix material into a mold according to requirements, placing the mold in a hot-pressing sintering furnace, heating and pressurizing the material, wherein the heating speed is 100 ℃/min in the first 4min, and then heating to the set temperature at the speed of 105 ℃/min; the temperature is raised to 680 ℃;
2) pressurizing the hot-pressing sintering furnace and continuously heating for low-pressure sintering treatment, wherein the sintering temperature is 960 ℃, the pressure is 12MPa, and the heat preservation and pressure maintaining time is 3.8min
3) Cutting off power, firstly cooling the material to 550 ℃ along with the furnace, discharging, then cooling to room temperature outside the furnace to form a diamond-impregnated bit blank, and demoulding; testing that its density should not be less than 95% of theoretical density;
4) sending the diamond-impregnated bit blank sintered at low pressure into a hot isostatic pressing furnace, stably and uniformly placing the blank, reserving a proper space in the furnace, carrying out hot isostatic pressing treatment on the diamond-impregnated bit blank, firstly vacuumizing the hot isostatic pressing furnace, filling inert gas nitrogen, then starting a high-pressure air pump for pressurization, and electrifying and heating when the pressure reaches 60% of a design pressure value; when the temperature and the pressure reach preset values, entering a hot isostatic pressing procedure; hot isostatic pressing process parameters: the preset temperature is 1280 ℃, and the preset pressure is 100 MPa; when the preset temperature and pressure are reached, preserving heat and maintaining pressure for 1.2 h;
5) and (3) cutting off power, cooling and depressurizing the drill bit along with the furnace, cooling to room temperature along with the furnace, discharging, and mechanically processing and decorating the formed diamond-impregnated drill bit to obtain the diamond-impregnated drill bit manufactured by the non-pressure and hot isostatic pressing method.
For the diamond-impregnated bit obtained in the embodiment, the density of the matrix of the diamond-impregnated bit is detected to reach 99.9%, and the strength of the diamond-impregnated bit matrix made by using the tension ring is detected to be about 42% higher than the strength of the diamond-impregnated bit matrix made of the same matrix material by adopting a common hot pressing method; testing the hardness of the drill bit matrix to HRC58 by using an HR-150A hardness tester; testing the wear resistance to 11mg by using an MPx-2000 friction wear testing machine; this is a performance index that cannot be achieved by ordinary hot press drills. The drill bit andsame mine areaThe commercial diamond drill bit carries out contrast drilling test, and the drilling efficiency of the drill bit trial-manufactured is improved by 8%, and the service life of the drill bit is improved by about 32%.
According to the embodiment, due to the optimized matching of the preferable matrix material and the manufacturing method and process parameters, the performance of the diamond-impregnated bit manufactured by the method can reach HRC 50-HRC 62, the corresponding wear resistance (referred to as abrasion loss) is reduced to 14-10 mg (tested by an MPx-2000 friction wear tester), the mechanical property of the diamond-impregnated bit manufactured by the methods of common hot pressing, non-pressure impregnation and the like is far exceeded, and a firm foundation is laid for prolonging the service life of the diamond-impregnated bit. Meanwhile, the density of the matrix of the diamond-impregnated bit can reach 99.8-99.9% by adopting the low-pressure sintering and hot isostatic pressing method, which is far higher than about 95% of a pressureless dipping method and is higher than about 97% of a common hot pressing method; the internal porosity of the matrix is almost eliminated, meanwhile, the internal organization structure of the matrix of the diamond-impregnated bit is improved, the overall mechanical property of the matrix of the bit is improved, and the characteristics of high hardness and high wear resistance are realized; the drill bit matrix is high in diamond wrapping strength, the drill bit matrix can achieve slightly advanced diamond abrasion, timely and appropriate effective edge cutting of the diamond is guaranteed, the drilling speed is high and stable, and the service life of the drill bit is long.
Claims (8)
1. The high-wear-resistance diamond-impregnated bit matrix material is characterized in that: the weight percentages of the components are as follows: 42-56% of FAM-1020, 16-22% of FAM-3010, 28-36% of FAM-2120 and inevitable impurities.
2. The high wear resistant diamond-impregnated bit matrix material of claim 1, wherein: the weight percentages of the components are as follows: 47-52% of FAM-1020, 18-20% of FAM-3010, 31-33% of FAM-2120 and inevitable impurities.
3. The high wear resistant diamond-impregnated bit matrix material of claim 1, wherein: the granularity of raw materials of each component is 320-400 meshes.
4. A method of making a diamond-impregnated bit using the highly wear resistant diamond-impregnated bit matrix material of claim 1, comprising the steps of:
1) heating the matrix material to 650-700 ℃ at a speed of 90-115 ℃/min;
2) pressurizing and continuously heating to perform low-pressure sintering treatment on the matrix material, wherein the sintering temperature is 950-970 ℃, the pressure is 9-12 MPa, and the heat preservation and pressure maintaining are performed for 3.0-5.0 min;
3) cooling the matrix material to room temperature to form a diamond-impregnated bit blank;
4) carrying out hot isostatic pressing treatment on the diamond-impregnated bit blank, wherein the hot isostatic pressing treatment temperature is 1150-1320 ℃, the pressure is 75-110 MPa, and the heat preservation and pressure maintaining are carried out for 0.5-1.5 h;
5) and cooling to room temperature to obtain the diamond-impregnated bit.
5. The method of manufacturing a diamond-impregnated drill bit according to claim 4, wherein: during the temperature rise in the step 1), the temperature rise speed is 90-95 ℃/min in the first 0-5 min, and the temperature rise speed is 100-115 ℃/min later.
6. The method of manufacturing a diamond-impregnated drill bit according to claim 4, wherein: in the step 2), when the green body is sintered at low pressure, the density of the green body is controlled to be greater than or equal to 94% of the theoretical density.
7. The method of manufacturing a diamond-impregnated drill bit according to claim 4, wherein: in the step 3), when the matrix material is cooled, the matrix material is cooled to 450-550 ℃ along with the furnace, and then the matrix material is taken out of the furnace and cooled to room temperature.
8. The method of manufacturing a diamond-impregnated drill bit according to claim 4, wherein: in the step 4), during the hot isostatic pressing treatment, the furnace of the hot isostatic pressing is vacuumized, inert protective gas is filled, and then the pressure in the furnace is increased and the temperature is raised to a set value.
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