An assembled synthetic block capable of temperature field adjustment

Abstract

The present application relates to the technical field of superhard material manufacturing, and particularly relates to an assembled synthesis block capable of realizing temperature field adjustment, comprising: a leaf block with a through hole, a conductive pipe, a composite salt pipe, a conductive sheet, a conductive steel ring, a salt sheet and an assembly kit; the conductive pipe is arranged at the inner circumferential part of the leaf block; the composite salt pipe is arranged at the inner circumferential part of the conductive pipe; the conductive sheet is arranged at both ends of the conductive pipe; the conductive sheet and the composite salt pipe enclose a containing space; the conductive steel ring is arranged at one end of the conductive sheet away from the conductive pipe and located in the through hole; and the salt sheet and the assembly kit are alternately stacked in the containing space. The composite salt pipe changes the internal temperature field distribution of the assembled synthesis block by changing the composition and combination structure; firstly, the resistance value is changed by doping different resistivity substances to the salt pipe, and then the heat generation is changed; secondly, the heat transfer effect is changed by doping different thermal conductivities, and then the temperature field is adjusted.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of superhard material manufacturing, and particularly relates to an assembled synthesis block capable of adjusting a temperature field. BACKGROUND

[0002] At present, the temperature conduction mode in the cavity of the assembled synthesis block of the polycrystalline diamond compact is mainly conduction from the electrically conductive graphite carbon tube to the central region. Since the synthesis time is short, there is a certain temperature difference between the middle part of the carbon tube and the edge region at both ends of the carbon tube, and it can be inferred that there is a certain temperature difference between the polycrystalline layer of the PDC and the hard alloy at both ends. Obviously, the internal stress of the PDC prepared by using the existing assembling method of the assembled synthesis block of the polycrystalline diamond compact changes greatly, which leads to the problems of easy cracking in the actual well drilling process, reduced wear resistance and impact resistance, and thus the polycrystalline diamond compact is invalid.

[0003] Therefore, the prior art still needs to be improved and developed. SUMMARY

[0004] In view of the above problems in the prior art, the present application aims to provide an assembled synthesis block capable of adjusting a temperature field, which aims to solve the problem of uneven temperature field change of the existing assembled synthesis block, leading to large internal stress change of the product.

[0005] The technical scheme of the present application is as follows:

[0006] An assembled synthesis block capable of adjusting a temperature field comprises:

[0007] A talc block with a through hole;

[0008] An electrically conductive tube is arranged at the inner periphery of the talc block;

[0009] A composite salt tube is arranged at the inner periphery of the electrically conductive tube;

[0010] An electrically conductive sheet is arranged at both ends of the electrically conductive tube; the electrically conductive sheet and the composite salt tube form a receiving space;

[0011] An electrically conductive steel ring is arranged at one end of the electrically conductive sheet away from the electrically conductive tube and located in the through hole;

[0012] A plurality of salt sheets and a plurality of assembly kits are alternately stacked in the receiving space.

[0013] The assembled synthesis block capable of adjusting a temperature field, wherein the electrically conductive tube is an electrically conductive carbon tube; and the electrically conductive sheet is a carbon sheet.

[0014] The assembly synthetic block capable of realizing temperature field adjustment, wherein the composite salt pipe comprises a plurality of pure salt pipes, a plurality of doped salt pipes and a plurality of impurity pipes.

[0015] The assembly synthetic block capable of realizing temperature field adjustment, wherein the composite salt pipe is a single-layer structure or a multi-layer structure, and the thickness of each layer of the single-layer structure or the multi-layer structure is 0.5-5 mm.

[0016] The assembly synthetic block capable of realizing temperature field adjustment, wherein the composite salt pipe is a single-layer structure, and the composite salt pipe is composed of two or three of the pure salt pipe, the doped salt pipe and the impurity pipe.

[0017] The assembly synthetic block capable of realizing temperature field adjustment, wherein the composite salt pipe comprises at least two layers, and each layer of the composite salt pipe is composed of one, two or three of the pure salt pipe, the doped salt pipe and the impurity pipe.

[0018] The assembly synthetic block capable of realizing temperature field adjustment, wherein the material of the salt in the pure salt pipe, the doped salt pipe and the salt sheet is independently selected from one or more of chloride and oxide.

[0019] The assembly synthetic block capable of realizing temperature field adjustment, wherein the resistivity of the dopant in the doped salt pipe is 10 -8 (Ω·m) to 10 5 (Ω·m) or the thermal conductivity is less than 10 W / (m·K).

[0020] The assembly synthetic block capable of realizing temperature field adjustment, wherein the mass of the dopant in the doped salt pipe accounts for 0.1-50% of the total mass of the doped salt pipe.

[0021] Beneficial effects: the application provides an assembled synthesis block capable of realizing temperature field adjustment, comprising: a beryl block with a through hole, a conductive pipe, a composite salt pipe, a conductive sheet, a conductive steel ring, salt sheets and an assembling kit; the conductive pipe is arranged at the inner circumferential part of the beryl block; the composite salt pipe is arranged at the inner circumferential part of the conductive pipe; the conductive sheet is arranged at both ends of the conductive pipe; the conductive sheet and the composite salt pipe enclose a containing space; the conductive steel ring is arranged at one end of the conductive sheet away from the conductive pipe and located in the through hole; a plurality of the salt sheets and a plurality of the assembling kits are alternately stacked in the containing space. The application transmits the electric current to the conductive pipe through the conductive steel ring, provides the temperature required for sintering in the interior of the assembling kit by using the conductive pipe to heat; at high temperature, the salt is melted into liquid state and provides a stable static pressure environment around the assembling kit, reduces the internal stress difference of the product in the interior of the assembling kit caused by uneven pressure under high pressure; the composite salt pipe changes the temperature field distribution in the interior of the assembled synthesis block by changing the composition and combination structure; one is to change the resistance value by doping different resistivity substances to the salt pipe, and then change the heat generation; the other is to change the heat transfer effect by doping different thermal conductivities. The temperature field in the interior of the assembled synthesis block under high temperature and high pressure synthesis can be adjusted by the two ways, and the product prepared has better synthesis quality and higher wear resistance. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a structure schematic diagram of the assembled synthesis block capable of realizing temperature field adjustment of the application;

[0023] Figure 2 It is a structure schematic diagram of the assembled synthesis block of comparative example 1 of the application;

[0024] Figure 3 It is a data table diagram of the assembled synthesis block of example 1 and comparative example 1 of the application;

[0025] Figure 4 It is a structure schematic diagram of the assembled synthesis block capable of realizing temperature field adjustment of example 2 of the application;

[0026] Figure 5 It is a structure schematic diagram of the assembled synthesis block capable of realizing temperature field adjustment of example 3 of the application;

[0027] Figure 6 It is a structure schematic diagram of the assembled synthesis block capable of realizing temperature field adjustment of example 4 of the application. DETAILED DESCRIPTION

[0028] The application provides an assembled synthesis block capable of realizing temperature field adjustment, in order to make the purpose, technical scheme and effect of the application more clear and definite, the application is further described in detail below. It should be understood that the specific embodiments described herein are only used to explain the application and not used to limit the application.

[0029] Those skilled in the art can understand that, unless otherwise defined, 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 application belongs. It should also be 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 relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0030] As shown in Figure 1 The present application provides an assembled synthesis block capable of adjusting temperature field, comprising:

[0031] A block of pyrophyllite 10 with a through hole;

[0032] A conductive tube 20 arranged at the inner periphery of the block of pyrophyllite 10;

[0033] A composite salt tube 30 arranged at the inner periphery of the conductive tube 20;

[0034] A conductive sheet 40 arranged at both ends of the conductive tube 20; the conductive sheet 40 and the composite salt tube 30 form a receiving space;

[0035] A conductive steel ring 50 arranged at one end of the conductive sheet 40 away from the conductive tube 20 and located in the through hole;

[0036] A plurality of salt sheets 60 and a plurality of assembly kits 70, the plurality of salt sheets 60 and the plurality of assembly kits 70 are alternately stacked in the receiving space.

[0037] In this embodiment, the composite salt tube is obtained by changing the composition and combination structure of the salt tube. The composite salt tube has different local heating capacity or different heat transfer effect, which can adjust the temperature field inside the assembled synthesis block under high temperature and high pressure synthesis, so that the product inside the assembled synthesis block has better synthesis quality and higher wear resistance.

[0038] Further, the composite salt tube is obtained by using different components, different proportions, different layer thicknesses, and different segment heights for combination, so that the assembled synthesis block can control the resistivity or thermal conductivity at different positions through the composite salt tube, thereby achieving the purpose of adjusting the temperature field of the cavity of the assembled synthesis block under high temperature and high pressure, and to some extent reducing the difference between the low temperature at both ends and the high temperature in the middle of the existing assembled synthesis block.

[0039] In some embodiments, the block of pyrophyllite is a cubic block of pyrophyllite with a cylindrical through hole.

[0040] In some embodiments, the conductive tube is, but not limited to, a conductive carbon tube; the conductive sheet is, but not limited to, a carbon sheet. The current is transmitted to the conductive carbon tube and the carbon sheet through the conductive steel ring, and the conductive carbon tube and the carbon sheet are used to generate heat to provide the temperature required for sintering inside the assembly kit.

[0041] In some embodiments, the composite salt tube includes a plurality of pure salt salt tubes, a plurality of doped salt tubes, and a plurality of impurity tubes. The composite salt tube obtained by combining the plurality of pure salt salt tubes, the plurality of doped salt tubes, and the plurality of impurity tubes can realize the adjustment of the heat generation and the thermal conductivity of the salt tube, so that the temperature in the assembly block is more uniform, that is, the product in the assembly kit is uniformly heated, and the generation of internal stress is reduced.

[0042] Further, the doped salt tube adds a substance with different resistivity than the main component or a substance with different thermal conductivity than the main component to the pure salt salt tube, so as to realize the adjustment of the heat generation and the thermal conductivity of the salt tube, and further realize the temperature field adjustment of the assembly block by the composite salt tube. The impurity tube is an impurity tube composed of pure carbon, pure metal, pure metal oxide, etc., and has the functions of reducing heat generation or heat preservation.

[0043] In some embodiments, the composite salt tube is a single-layer structure or a multi-layer structure; the thickness of each layer of the single-layer structure or the multi-layer structure of the composite salt tube is 0.5-5 mm. By controlling the thickness of the single-layer structure of the composite salt tube or the thickness of each layer of the multi-layer structure of the composite salt tube, the cavity temperature field of the assembly block can be changed, so as to achieve the purpose of adjusting the cavity temperature field of the assembly block under high temperature and high pressure.

[0044] In some embodiments, the composite salt tube is a single-layer structure, and the composite salt tube is composed of two or three of the plurality of pure salt salt tubes, the plurality of doped salt tubes, and the plurality of impurity tubes.

[0045] Further, when the composite salt tube is a single-layer structure, the composite salt tube includes at least two pure salt salt tubes and at least one doped salt tube; the pure salt salt tube is arranged close to the conductive sheet, and the doped salt tube is located between the pure salt salt tubes, forming a "pure salt salt tube-doped salt tube-pure salt salt tube" structure. The doped substance with different resistivity than the salt in the doped salt tube makes the heat generation of the region decrease, or the doped substance with different thermal conductivity than the salt in the doped salt tube makes the region have lower thermal conductivity and better heat preservation effect, thereby realizing the temperature field adjustment of the assembly block.

[0046] In some embodiments, the number of layers of the composite salt tube includes at least two layers, and each layer of the composite salt tube is composed of one, two, or three of the plurality of pure salt salt tubes, the plurality of doped salt tubes, and the plurality of impurity tubes.

[0047] Further, the composite salt tube is a double-layer structure, which comprises a pure salt tube arranged close to the assembly kit, at least one section of doped salt tube arranged close to the conductive tube, and pure salt tubes arranged close to both ends of the conductive sheet of the doped salt tube.

[0048] Specifically, when the composite salt tube is a double-layer structure, the doped salt tube arranged close to the conductive tube can be one section of doped salt tube and pure salt tubes arranged at both ends of the doped salt tube; or two sections of doped salt tube, four sections of doped salt tube, six sections of doped salt tube, eight sections of doped salt tube, ten sections of doped salt tube, and arranged in a central symmetry, and the last section of doped salt tube is provided with a pure salt tube in contact with the conductive sheet. Moreover, the doped salt tube is doped by different dopants, and the dopants of the symmetrically arranged doped salt tubes are the same, so as to ensure the uniform temperature of the cavity in the assembly synthesis block.

[0049] In some embodiments, the material of the salt in the pure salt tube, the doped salt tube and the salt sheet is independently selected from one or more of chloride and oxide; chloride and oxide have stability at high temperature.

[0050] In some preferred embodiments, the chloride includes but is not limited to sodium chloride, potassium chloride, magnesium chloride, calcium chloride; and the oxide includes but is not limited to magnesium oxide and zirconium oxide.

[0051] In some embodiments, the resistivity of the dopant in the doped salt tube is between 10 -8 (Ω·m) and 10 5 (Ω·m) or the thermal conductivity is less than 10 W / (m·K).

[0052] In some preferred embodiments, the dopant in the doped salt tube has a resistivity different from the main component at room temperature, and the resistivity is between 10 -8 (Ω·m) and 10 5 (Ω·m), including but not limited to silver, copper, iron, carbon and silicon.

[0053] Specifically, by doping conductive substances with different resistivities from the salt in the composite salt tube, the composite salt tube can generate heat; the doped salt tube composed of metal, carbon and semiconductor, or the impurity tube composed of pure carbon and pure metal, and the region resistance formed by combining one section of the conductive tube with the doped salt tube, the cross-sectional area of the conductive substance in the region increases, the combined resistance of the region decreases, and therefore the heat generation of the region decreases, so as to achieve the purpose of temperature field regulation.

[0054] In some preferred embodiments, the doping salt pipe has a doping material with a thermal conductivity different from that of the main component at room temperature, and the thermal conductivity of the doping material is less than 10 W / (m·K), including but not limited to magnesium oxide, zirconium oxide, silicon dioxide, and polycrystalline boron nitride. Moreover, the doping salt pipe has a doping material different from the main component.

[0055] Specifically, the heat preservation effect can also be achieved by doping a non-conductive material with a different thermal conductivity from the salt in the composite salt pipe; the doping salt pipe composed of oxides, chlorides, carbides, nitrides, and other doping materials, or the impurity pipe composed of pure metal oxides, has a better heat preservation effect due to the low thermal conductivity of some doping materials (magnesium oxide, zirconium oxide, silicon dioxide, and cBN). The temperature loss of the region is reduced after the salt is doped to form a composite salt pipe, thereby achieving the effect of temperature field adjustment.

[0056] Further, since the conductive pipe can be considered as a section of resistance composed of several small sections, the composite salt pipe obtained by combining the doping salt pipe with different components, different proportions, different layer thicknesses, different segment heights, or the impurity pipe, or the pure salt pipe, can achieve the purpose of adjusting the temperature field of the assembled synthesis block (synthesis cavity) under high temperature and high pressure, so that the synthesized polycrystalline diamond product has better synthesis quality and higher wear resistance.

[0057] In some embodiments, the mass of the doping material in the doping salt pipe accounts for 0.1-50% of the total mass of the doping salt pipe; the doping mass ratio in this range can make the temperature field adjustment more uniform and not prone to temperature differences.

[0058] In some embodiments, when the pure salt pipe, the doping salt pipe, and the impurity pipe are each composed of multiple sections, the height of each section of the pure salt pipe or the doping salt pipe or the impurity pipe is not less than 5% of the total height of the conductive pipe; if the height is less than 5%, the adjustment of the temperature field is not obvious and cannot achieve the adjustment effect.

[0059] In some embodiments, the assembled synthesis block capable of adjusting the temperature field can be used for sintering polycrystalline diamond (PCD) or polycrystalline diamond compact (PDC) and other related products under high temperature and high pressure conditions, which have high wear resistance, high impact toughness, and high heat resistance, and thus have a wide application in the fields of geological drilling and oil exploration.

[0060] The following examples are further used to illustrate the present application. It should also be understood that the following examples are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the above content of the present application, which all belong to the protection scope of the present application.

[0061] Example 1

[0062] This embodiment prepares an assembled synthetic block which can realize temperature field adjustment, and a structural schematic diagram thereof is shown in Figure 1 The preparation method comprises the following steps:

[0063] Pure salt (sodium chloride, NaCl) is pressed into a pure salt salt tube 31 with a height of 36 mm or 8 mm and a layer thickness of 2 mm; carbon and NaCl are uniformly mixed according to a mass percentage of 45:55 to obtain a mixed powder; the mixed powder is placed in a special mold to be shaped, and is pressed into a tubular structure under a press to obtain a carbon-doped salt tube 32, which has a height of 20 mm and a layer thickness of 2 mm.

[0064] The carbon sheet, the salt sheet, the assembly kit, the salt sheet, the assembly kit, the salt sheet and the carbon sheet are arranged in the above order and are placed in the composite salt tube and the conductive carbon tube; the total height of the composite salt tube (the height of the conductive carbon tube minus the height of the two carbon sheets) is 36 mm, and the composite salt tube is divided into two layers: one layer close to the conductive carbon tube is arranged in the order of a pure salt salt tube with a height of 8 mm, a carbon-doped salt tube with a height of 20 mm and a pure salt salt tube with a height of 8 mm, and the total height is 36 mm; the carbon-doped salt tube in the middle of the layer and the conductive carbon tube form a composite resistance with a length of 20 mm, and the resistance is reduced due to the increase of the cross-sectional area, so that the heat generation is reduced, thereby reducing the difference between the low temperature at both ends and the high temperature in the middle of the commonly used PDC assembled synthetic block to a certain extent, and the purpose of adjustable temperature field is achieved; the layer close to the assembly kit is a pure salt salt tube with a height of 36 mm, and the layer and the salt sheet melt into liquid salt at high temperature to wrap the assembly kit and form an isotropic environment around the assembly kit, thereby reducing the difference in internal stress caused by uneven pressure under high pressure.

[0065] In order to illustrate that the carbon-doped salt tube plays a role in reducing resistance and reducing heat generation in the interior of the assembled synthetic block, a comparative example 1 is made.

[0066] Comparative example 1

[0067] In the comparative example 1, the pure salt salt tube is used to replace the carbon-doped salt tube in the interior, as shown in Figure 2 .

[0068] The comparative example 1 and the embodiment 1 are subjected to high temperature and high pressure synthesis on the same HPHT press at different synthesis powers. The temperature and total resistance of the synthetic cavity formed by the above structure under high temperature and high pressure are tested, and the obtained data table and graph are shown in Figure 3 . Figure 3 It is obvious that under the same synthesis power, such as 6500 W, the resistance and the cavity center temperature of the embodiment 1 are lower than those of the comparative example 1. The resistance of the embodiment 1 under 6600 W is lower than that under 6500 W, which is due to the fact that the resistance of carbon decreases with the increase of temperature.

[0069] Example 2

[0070] The pure salt (magnesium chloride, MgCl2) is pressed into a pure salt salt tube 31 with a height of 36 mm or 6 mm and a layer thickness of 3 mm; the magnesium oxide (MgO) and MgCl2 are mixed uniformly at a mass percentage of 25:75 to obtain a mixed powder; the mixed powder is placed in a special mold to shape, and is pressed into a tubular structure under a press to obtain a MgO-doped salt tube 33, which has a height of 24 mm and a layer thickness of 3 mm.

[0071] As shown in Figure 4 , the present embodiment is arranged in the order of carbon sheet, salt sheet, assembly kit, salt sheet, carbon sheet, and is placed in the composite salt tube and the conductive carbon tube. The total height of the composite salt tube (the height of the conductive carbon tube minus the height of the two carbon sheets) is 36 mm, and the composite salt tube is one layer: composed of a pure salt salt tube (31), a MgO-doped salt tube (33), and a pure salt salt tube (31) arranged in one layer in the order of a pure salt salt tube (31), a MgO-doped salt tube (33), and a pure salt salt tube (31), with a total height of 36 mm, the MgO-doped salt tube (33) in the middle of the cavity doped with MgO with a lower thermal conductivity and better heat preservation performance reduces temperature loss in the middle region. The above combination solves the problem of insufficient synthesis temperature of some existing PDC assembly synthesis blocks to a certain extent, and achieves the purpose of adjustable temperature field;

[0072] At the same time, the MgO-doped salt tube and the pure salt salt tube are composed of salt, and the region and the salt sheet melt into liquid salt at high temperature, wrap the polycrystalline diamond layer region of the assembly kit, and form an isostatic environment around it, reducing the difference in internal stress caused by uneven pressure under high pressure.

[0073] Example 3

[0074] The pure salt (potassium chloride, KCl) is pressed into a pure salt salt tube 31 with a height of 36 mm and a layer thickness of 1 mm; the zirconium dioxide (ZrO2) and KCl are mixed uniformly at a mass percentage of 40:60 to obtain a mixed powder; the mixed powder is placed in a special mold to shape, and is pressed into a tubular structure under a press to obtain a ZrO2-doped salt tube 34, which has a height of 36 mm and a layer thickness of 1 mm; the carbon is pressed into a pure carbon tube 35, which has a height of 12 mm and a layer thickness of 1 mm; and the pure MgO is pressed into a pure MgO tube 36, which has a height of 12 mm and a layer thickness of 1 mm.

[0075] As shown in Figure 5As shown, the embodiment will be arranged in the order of carbon sheet, salt sheet, assembly kit, salt sheet, assembly kit, salt sheet, carbon sheet, placed in the composite salt tube and conductive carbon tube. The total height of the composite salt tube (the height of the conductive carbon tube minus the height of the carbon sheet) is 36 mm, which is divided into three layers: the layer close to the conductive carbon tube is composed of a layer arranged in the order of pure MgO tube 36, pure carbon tube 35, and pure MgO tube 36, with a total height of 36 mm. The middle pure carbon tube 35 in this layer and the conductive carbon tube form a composite resistance of 12 mm in length. Due to the increase in cross-sectional area, the resistance at this point is reduced, thus reducing the heat generation. At the same time, the pure MgO tube 36 close to the carbon sheet uses MgO with a lower thermal conductivity and better heat preservation performance, reducing temperature loss in the two end regions. The middle layer of the composite salt tube uses a ZrO2-doped salt tube 34, which is doped with ZrO2 with a lower thermal conductivity and better heat preservation performance, reducing the temperature loss of the entire synthesis cavity. The pure carbon tube 35 reduces heat generation, and the ZrO2-doped salt tube 34 and the pure MgO tube 36 have heat preservation effects, which, in combination, to some extent, reduce the difference between the low temperature at the two ends and the high temperature in the middle of the commonly used PDC assembly synthesis block, achieving the purpose of adjustable temperature field. The layer close to the assembly kit is a pure salt salt tube 31 with a height of 36 mm. This layer and the salt sheet melt into liquid salt at high temperature, wrapping the assembly kit and forming an isotropic environment around it, reducing the difference in internal stress caused by uneven pressure under high pressure.

[0076] Example 4

[0077] The pure salt (calcium chloride, CaCl2) is pressed into a pure salt salt tube 31 with a height of 36 mm or 3 mm, and a layer thickness of 2 mm. Carbon and CaCl2 are mixed in a mass percentage of 10:90, 20:80, 30:70, 40:60, and 50:50, respectively, to obtain mixed powders with different mass percentages. The mixed powders are respectively placed in special molds to shape, and are respectively pressed into tubular structures under a press to obtain first, second, third, fourth, and fifth carbon-doped salt tubes 321, 322, 323, 324, and 325 with mass percentages of 10:90, 20:80, 30:70, 40:60, and 50:50, respectively. The heights of the above carbon-doped salt tubes are all 3 mm, and the layer thicknesses are all 2 mm.

[0078] As Figure 6As shown, the present embodiment is arranged in the order of carbon sheet, salt sheet, assembly kit, salt sheet, assembly kit, salt sheet, carbon sheet, and placed in the composite salt tube and the conductive carbon tube. The total height of the composite salt tube (the height of the conductive carbon tube minus the height of the carbon sheet) is 36mm, and is divided into two layers: the layer close to the conductive carbon tube is composed of: in the order of pure salt salt tube 31, first carbon-doped salt tube 321, second carbon-doped salt tube 322, third carbon-doped salt tube 323, fourth carbon-doped salt tube 324, fifth carbon-doped salt tube 325, fifth carbon-doped salt tube 325, fourth carbon-doped salt tube 324, third carbon-doped salt tube 323, second carbon-doped salt tube 322, first carbon-doped salt tube 321, and pure salt salt tube 31 arranged in one layer, with a total height of 36mm. The first carbon-doped salt tube 321, the second carbon-doped salt tube 322, the third carbon-doped salt tube 323, the fourth carbon-doped salt tube 324, and the fifth carbon-doped salt tube 325 in the middle of the layer each form a composite resistance of 3mm in length with the conductive carbon tube, respectively. Due to the increase in cross-sectional area, the resistance is reduced here, and thus the heat generation is reduced, thereby reducing the difference between the low temperature at both ends and the high temperature in the middle of the commonly used PDC assembly synthesis block to a certain extent, achieving the purpose of adjustable temperature field; the layer close to the assembly kit is composed of a pure salt salt tube with a height of 36mm, and the salt sheet melts into liquid salt at high temperature to wrap the assembly kit and form an isotropic pressure environment around it, reducing the difference in internal stress caused by uneven pressure under high pressure.

[0079] In summary, the present application provides an assembly synthesis block capable of adjusting the temperature field, which comprises: a talc block with a through hole, a conductive tube, a composite salt tube, a conductive sheet, a conductive steel ring, a salt sheet, and an assembly kit; the conductive tube is arranged on the inner circumferential part of the talc block; the composite salt tube is arranged on the inner circumferential part of the conductive tube; the conductive sheet is arranged on both ends of the conductive tube; the conductive sheet and the composite salt tube form a receiving space; the conductive steel ring is arranged on the end of the conductive sheet away from the conductive tube and located in the through hole; a plurality of salt sheets and a plurality of assembly kits are alternately stacked in the receiving space. The present application transmits electric current to the conductive tube through the conductive steel ring, and uses the conductive tube to generate heat to provide the temperature required for sintering in the interior of the assembly kit; at high temperature, the salt melts into a liquid state and provides a stable static pressure environment around the assembly kit, reducing the difference in internal stress of the products in the interior of the assembly kit caused by uneven pressure under high pressure; the composite salt tube changes the temperature field distribution in the interior of the assembly synthesis block by changing the composition and combination structure; one is to change the resistance value by doping different resistivity substances into the salt tube, thereby changing the heat generation; the other is to change the heat transfer effect by doping different thermal conductivity substances. Through these two ways, the temperature field in the interior of the assembly synthesis block under high temperature and high pressure synthesis can be adjusted, and the product has better synthesis quality and higher wear resistance.

[0080] It should be understood that the application is not limited to the examples described above, which can be modified or transformed by a person of ordinary skill in the art in light of the above description, all these modifications and transformations being intended to belong to the scope of protection of the application as defined by the claims hereafter.

Claims

1. An assembled synthetic block that enables temperature field adjustment, characterized by, The application relates to a synthetic block, which comprises: a block of talc with a through hole; a conductive tube arranged at the inner periphery of the talc block; a composite salt tube arranged at the inner periphery of the conductive tube; a conductive sheet arranged at both ends of the conductive tube; the conductive sheet and the composite salt tube form a containing space; a conductive steel ring arranged at one end of the conductive sheet away from the conductive tube and located in the through hole; a plurality of salt sheets and a plurality of assembly kits, the plurality of salt sheets and the plurality of assembly kits are alternately stacked in the containing space; the composite salt tube comprises a plurality of pure salt tubes, a plurality of doped salt tubes and a plurality of impurity tubes; the composite salt tube is a single-layer structure or a multi-layer structure; the assembly synthetic block controls the resistivity or thermal conductivity at different positions through the composite salt tube, so that the difference between the low temperature at both ends of the assembly synthetic block and the high temperature in the middle is reduced.

2. The temperature field regulation enabled assembled synthetic block of claim 1, wherein, The conductive tube is a conductive carbon tube; the conductive sheet is a carbon sheet.

3. The temperature field regulation enabled assembled synthetic block of claim 1, wherein, The thickness of each layer of the single-layer structure or the multi-layer structure of the composite salt tube is 0.5-5 mm.

4. The temperature field regulation enabled assembled synthetic block of claim 1, wherein, The composite salt tube is a single-layer structure, and the composite salt tube is formed by two or three of the plurality of pure salt tubes, the plurality of doped salt tubes and the plurality of impurity tubes.

5. The temperature field regulation enabled assembled synthetic block of claim 1, wherein, The number of layers of the composite salt tube comprises at least two layers, and each layer of the composite salt tube is formed by one, two or three of the plurality of pure salt tubes, the plurality of doped salt tubes and the plurality of impurity tubes.

6. The temperature field regulation enabled assembled synthetic block of claim 1, wherein, The material of the salt in the pure salt tube, the doped salt tube and the salt sheet is independently selected from one or more of chlorides and oxides.

7. The temperature field regulation enabled assembled synthetic block of claim 1, wherein, The resistivity of the dopant in the doped salt tube is between 10 -8 (Ω-m) and 10 5 (Ω-m) or the thermal conductivity is less than 10 W / (m-K).

8. The temperature field regulation enabled assembled synthetic block of claim 1, wherein, The mass of the dopant in the doped salt tube accounts for 0.1-50% of the total mass of the doped salt tube.

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