Assembling block formed by combining multiple polycrystalline compacts

Abstract

The utility model belongs to the technical field of superhard composite material processing devices, and particularly relates to a multi-piece polycrystalline composite sheet synthesis assembly block, which comprises a pyrophyllite shell, a plugging assembly and a heating assembly, the sample mold comprises an upper mold, upper sample chambers, lower molds and lower sample chambers, the upper sample chambers are uniformly distributed along a loop line coaxial with the upper mold, the positions of the lower sample chambers and the upper sample chambers are in one-to-one correspondence, and the upper sample chambers and the lower sample chambers are aligned to just form sample chambers consistent with the outer contour of the clad sheet; and the axis direction of the sample chamber is parallel to the radial direction of the sample mold. The combined assembly block is used for solving the technical problem that when an existing combined assembly block is used, due to the fact that a large temperature gradient exists in the radial direction of a sample mold, the performance difference of sintered polycrystalline compacts is large easily.

Description

Technical Field

[0001] The utility model belongs to the technical field of superhard composite material processing devices, and particularly relates to a synthetic assembly block for multi-piece polycrystalline composite sheets. Background Art

[0002] Superhard material polycrystalline composite sheets, including polycrystalline diamond composite sheets, polycrystalline cubic boron nitride composite sheets, etc., have played an important role in different fields since their birth in the 1950s and 1960s of last century due to their ultra-high hardness characteristics and isotropy relative to superhard material single crystals. Currently, they are widely used in traditional fields such as machinery, metallurgy, coal geology, oil and gas, building decoration, etc., as well as high-tech fields such as electronic information, aerospace, and national defense and military industries.

[0003] Currently, a six-sided top press is commonly used in combination with a synthetic assembly block to sinter and synthesize superhard material polycrystalline composite sheets under high temperature and high pressure conditions. Specifically, for the currently used synthetic assembly blocks, multiple through holes are arranged on the end faces of cylindrical sample molds, and products and other components are loaded into the through holes of the sample molds in the direction parallel to the end faces of the sample molds with the working layers of the polycrystalline composite sheets, and the polycrystalline composite sheets are synthesized on a six-sided top press using the static high temperature and high pressure method. Among them, the uniformity of the temperature field in the synthesis cavity and the reasonable temperature distribution determine the quality and stability of the polycrystalline composite sheets. However, when synthesizing polycrystalline composite sheets using the indirect heating method in the prior art, there is a large temperature gradient along the radial direction of the sample mold, resulting in too large a temperature difference between the parts near the periphery and the center of the sample mold on the composite layer of the polycrystalline composite sheet, inconsistent sintering degrees, and thus a large difference in their performance. Summary of the Utility Model

[0004] Aiming at the deficiencies existing in the prior art, the purpose of the utility model is to provide a synthetic assembly block for multi-piece polycrystalline composite sheets, which is used to solve the technical problem that when the current synthetic assembly block is used, due to the large temperature gradient along the radial direction of the sample mold, it is easy to cause a large difference in the performance of the sintered polycrystalline composite sheets.

[0005] To achieve the above object, the technical solution of the present utility model is: a synthetic assembly block for multi-piece polycrystalline composite sheets, the synthetic assembly block comprising a pyrophyllite housing, a plugging assembly, and a heating assembly. The pyrophyllite housing is provided with a through hole penetrating up and down along its central axis. The plugging assembly is used to plug both ends of the through hole. A sample mold coaxial with the through hole is arranged inside the pyrophyllite housing. The sample mold includes an upper mold, an upper sample chamber on the bottom surface of the upper mold, a lower mold, and a lower sample chamber arranged on the top surface of the lower mold and having the same shape as the upper sample chamber. The upper sample chambers are evenly distributed along a loop coaxial with the upper mold. The positions of the lower sample chambers correspond one by one to those of the upper sample chambers. The upper sample chamber and the lower sample chamber are aligned to exactly form a sample chamber consistent with the outer contour of the composite sheet. The axial direction of the sample chamber is parallel to the radial direction of the sample mold. The heating assembly is placed inside the through hole and covers the circumference and end faces of the sample mold.

[0006] Preferably, the sample mold further includes an intermediate mold arranged between the upper mold and the lower mold. Intermediate sample chambers are provided on both the upper and lower end faces of the intermediate mold. The intermediate sample chamber on the upper end face corresponds to and aligns with the upper sample chamber to form the sample chamber, and the intermediate sample chamber on the lower end face corresponds to and aligns with the lower sample chamber to form the sample chamber.

[0007] Preferably, the sample mold is made of any one of magnesia, dolomite, and zirconia.

[0008] Preferably, the plugging assembly includes a conductive steel ring placed at the inner end of the through hole, dolomite filled in the conductive steel ring, and a conductive sheet. One end of the conductive steel ring close to the sample mold is closed and the other end is open. The conductive sheet is arranged at the open end of the conductive steel ring.

[0009] Preferably, the conductive sheet is a circular sheet made of titanium.

[0010] Preferably, the heating assembly includes a heating tube coaxially sleeved outside the sample mold and fitting the inner wall of the through hole, and a heating column arranged between the end face of the sample mold and the plugging assembly.

[0011] Preferably, both the heating tube and the heating column are made of graphite.

[0012] Preferably, the heating assembly further includes a heat insulation sheet made of an insulating material. A plurality of uniformly distributed through holes penetrating up and down are provided on the heat insulation sheet, and the heating columns are placed in each of the accommodation holes.

[0013] The beneficial effects of adopting the technical solution of the present utility model are:

[0014] In the present utility model, the sample chambers are evenly distributed along a loop coaxial with the sample mold, and the axial direction of the sample chambers is parallel to the radial direction of the sample mold. In combination with the heating components covering the axial direction and end face of the sample mold, the distances from the composite layers of the composite sheets in each sample chamber to the heating components are basically the same. When the heating components generate heat, the heat can be evenly radiated to the parts that need high-temperature sintering. Moreover, the distances from the composite sheets in each sample chamber to the heating components are evenly consistent, and all the composite sheets in the sample mold are in relatively equivalent positions, eliminating the problem of large differences in the relative equivalent positions of the composite sheets in the existing multi-sheet assembled synthetic block, and ensuring the quality consistency of the synthesized polycrystalline composite sheets. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 FIG. is an overall schematic diagram of an embodiment of a multi-sheet polycrystalline composite sheet synthetic block;

[0016] Figure 2 FIG. is a schematic diagram of the sample mold of an embodiment of a multi-sheet polycrystalline composite sheet synthetic block;

[0017] Figure 3 FIG. is a top view schematic diagram of the heat insulation sheet of an embodiment of a multi-sheet polycrystalline composite sheet synthetic block;

[0018] Figure 4 FIG. is a schematic diagram of the state of the composite sheet in a sample chamber of an embodiment of a multi-sheet polycrystalline composite sheet synthetic block;

[0019] Figure 5 FIG. is a schematic diagram of the state of the composite sheet in a sample chamber of a second embodiment of a multi-sheet polycrystalline composite sheet synthetic block.

[0020] Among them, Figures 1-5 in, 1 - pyrophyllite shell, 2 - conductive steel ring, 3 - conductive sheet, 4 - heat insulation sheet, 41 - accommodation hole, 5 - heating column, 6 - heating tube, 7 - sample mold, 71 - upper mold, 72 - lower mold, 73 - lower sample chamber, 74 - intermediate mold, 75 - intermediate sample chamber, 8 - sample chamber, 9 - heating sheet, 10 - composite sheet. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments, and do not limit the scope of the present utility model.

[0022] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0023] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0024] The specific embodiments are as follows:

[0025] Embodiment 1, as Figures 1-4 shown, a synthetic assembly block for multi-piece polycrystalline composite sheets, the synthetic assembly block includes a pyrophyllite housing 1, a plugging assembly, a heating assembly, and a sample mold 7. The pyrophyllite housing 1 is cylindrical or cubic in shape, and its central axis is vertical. A through hole penetrating up and down is coaxially provided on the pyrophyllite housing 1 for accommodating the plugging assembly, the heating assembly, and the sample mold 7. An inner layer composed of dolomite or magnesia is provided on the inner wall of the through hole. Two plugging assemblies are provided and plugged at both ends in the through hole.

[0026] The sample mold 7 is generally cylindrical in shape and is coaxially arranged in the through hole. The sample mold 7 includes an upper mold 71, a lower mold 72, an upper sample chamber, and a lower sample chamber 73. A plurality of upper sample chambers are provided and are uniformly arranged in a ring along the axis of the upper mold 71 on the bottom surface of the upper mold 71. The lower sample chamber 73 has the same shape as the upper sample chamber, is provided on the top surface of the lower mold 72, and corresponds to the position of the upper sample chamber one by one. When the upper mold 71 and the lower mold 72 are closed and the upper sample chambers and the lower sample chambers 73 are aligned one by one, the upper sample chamber and the corresponding lower sample chamber 73 just form a sample chamber 8 that is consistent with the outer contour of the composite sheet 10. The axial direction of the sample chamber 8 is parallel to the radial direction of the sample mold 7.

[0027] In this embodiment, the cavity of the sample chamber 8 is generally cylindrical in shape, as Figure 4 shown.

[0028] The heating component is placed inside the through hole and covers the circumference and the outer end faces of the sample mold 7 to ensure heating radiation to all parts inside the sample mold 7. Specifically, the heating component includes a heating tube 6 and heating columns 5. The heating tube 6 is coaxially sleeved outside the sample mold 7 and is attached to the inner wall of the through hole of the pyrophyllite housing 1. A plurality of heating columns 5 are provided and are evenly arranged outside the two end faces of the sample mold 7. The heating component further includes a heating sheet 9, and the heating sheet 9 is arranged between the heating columns 5 and the sample mold 7.

[0029] In this embodiment, both the heating tube 6 and the heating columns 5 are made of graphite.

[0030] In this embodiment, the thickness of the heating tube 6 is preferably 1.5 mm.

[0031] When a multi-piece polycrystalline composite sheet synthesis and assembly block of this embodiment is in use, each composite layer is placed inside the sample chamber 8, the sample mold 7, the plugging component and the heating component are assembled inside the pyrophyllite housing 1, and the whole is placed on a six-sided top press to synthesize the composite sheet 10. Since the axial direction of the sample chamber 8 is parallel to the radial direction of the sample mold 7, it is ensured that the distances from all positions on the same composite layer of the composite sheet 10 to the tube wall of the heating tube 6 are basically the same. The heating tube 6 can uniformly radiate heat to the parts that need to be sintered at high temperature, ensuring the sintering quality and consistency. Also, since the sample chambers 8 are evenly distributed along a loop coaxial with the sample mold 7, the distances from the composite sheets 10 inside each sample chamber 8 to the heating component are uniform and consistent. All the composite sheets 10 inside the sample mold 7 are in relatively equivalent positions, eliminating the problem of large differences in the relative equivalent positions of the composite sheets in the existing multi-piece synthesis and assembly block, and ensuring the quality consistency of the synthesized polycrystalline composite sheets.

[0032] Furthermore, the sample mold 7 further includes an intermediate mold 74. The intermediate mold 74 is located between the upper mold 71 and the lower mold 72, and intermediate sample chambers 75 are provided on both the upper and lower end faces of the intermediate mold 74. The intermediate sample chambers 75 on the upper and lower end faces have the same shape as the upper sample chamber and the lower sample chamber 73. The intermediate sample chamber 75 on the upper end face corresponds to and can be aligned with the upper sample chamber to form the sample chamber 8; the intermediate sample chamber 75 on the lower end face corresponds to and can be aligned with the lower sample chamber 73 to form the sample chamber 8; thus, two rows of sample chambers 8 are formed in the sample mold 7, and the relative equivalent positions of each sample chamber 8 are the same, resulting in good quality consistency of the composite sheets 10 synthesized in the same batch.

[0033] In this embodiment, the sample mold 7 is made of any one of magnesia, dolomite, and zirconia.

[0034] Further, the plugging component includes a conductive steel ring 2, dolomite, and a conductive sheet 3. The conductive steel ring 2 is in the shape of a hollow cylinder with an outer diameter consistent with the inner diameter of the through hole, and is plugged at the end of the through hole. One end of the conductive steel ring 2 close to the outside is closed, and the end close to the inside is open, and dolomite is filled inside the conductive steel ring 2. The conductive sheet 3 is arranged at the open end of the conductive steel ring 2, and its outer diameter is consistent with the inner diameter of the through hole, so that the heating column 5 is located between the sample mold 7 and the conductive sheet 3.

[0035] In this embodiment, the conductive sheet 3 is a circular sheet structure made of titanium.

[0036] Further, the heating component further includes a heat insulation sheet 4. The heat insulation sheet 4 is a circular sheet made of insulating material, and its outer diameter is consistent with the inner diameter of the through hole. In this embodiment, the heat insulation sheet 4 is preferably made of magnesium oxide. Uniformly distributed accommodation holes 41 are provided on the heat insulation sheet 4. The accommodation holes 41 penetrate through the heat insulation sheet 4 up and down, and the heating column 5 is arranged in the accommodation holes 41.

[0037] In this embodiment, the thickness of the heat insulation sheet 4 is between 1 mm and 5 mm.

[0038] Embodiment 2, as Figure 5 shown, the difference from Embodiment 1 lies in the cavity shape of the sample chamber. The cavity shape is that the end face close to the heating tube is a spherical surface, which is suitable for synthesizing spherical polycrystalline composite sheet products. Other structures will not be elaborated here.

[0039] The above has made an exemplary description of the present utility model in conjunction with the accompanying drawings. Obviously, the specific implementation of the present utility model is not limited by the above methods. As long as various non-substantive improvements are made by adopting the technical solutions of the present utility model, or the concept and technical solutions of the present utility model are directly applied to other occasions without improvement, they are all within the protection scope of the present utility model.

Claims

1. A composite assembly block of multiple polycrystalline composite sheets, comprising a pyrophyllite shell, a plugging component and a heating component, wherein the pyrophyllite shell is provided with a through hole extending vertically along its central axis, and the plugging component is used to plug both ends of the through hole, characterized in that: A sample mold coaxial with the through hole is arranged in the talc shell, and the sample mold includes an upper mold, an upper sample chamber on the bottom surface of the upper mold, a lower mold, and a lower sample chamber arranged on the top surface of the lower mold and having the same shape as the upper sample chamber. The upper sample chambers are evenly distributed along a ring line coaxial with the upper mold, the positions of the lower sample chambers correspond one to one with the upper sample chambers, the upper sample chambers and the lower sample chambers are aligned to form a sample chamber consistent with the outer contour of the composite sheet, and the axial direction of the sample chamber is parallel to the radial direction of the sample mold; the heating component is placed in the through hole and covered on the circumference and end surface of the sample mold.

2. A multi-piece polycrystalline compact synthetic assembly block according to claim 1, characterized in that: The sample mold also includes an intermediate mold arranged between the upper mold and the lower mold, and the upper and lower end surfaces of the intermediate mold are both provided with intermediate sample chambers. The intermediate sample chamber on the upper end surface corresponds to the position of the upper sample chamber and is formed after being aligned, and the intermediate sample chamber on the lower end surface corresponds to the position of the lower sample chamber and is formed after being aligned.

3. The multi-piece polycrystalline composite sheet synthetic assembly block according to claim 2, characterized in that: The sample mold is made of any one of magnesium oxide, dolomite and zirconium oxide.

4. The multi-piece polycrystalline compact synthetic assembly block according to claim 1, characterized in that: The sealing component includes a conductive steel ring placed at the inner end of the through hole, dolomite filled in the conductive steel ring, and a conductive sheet; the conductive steel ring is closed at one end close to the sample mold and open at the other end, and the conductive sheet is arranged at the open end of the conductive steel ring.

5. The multi-piece polycrystalline compact synthetic assembly block according to claim 4, characterized in that: The conductive sheet is a round sheet made of titanium.

6. The multi-piece polycrystalline compact synthetic assembly block according to claim 1, characterized in that: The heating component comprises a heating tube coaxially sleeved outside the sample mold and fitted to the inner wall of the through hole, and a heating column arranged between the end surface of the sample mold and the blocking component.

7. The multi-piece polycrystalline compact synthetic assembly block according to claim 6, characterized in that: The heating tube and the heating column are both made of graphite.

8. The multi-piece polycrystalline compact synthetic assembly block according to claim 7, characterized in that: The heating component also includes a heat-insulating sheet made of insulating material, on which a plurality of evenly distributed accommodating holes that penetrate vertically are arranged, and the heating column is placed in each of the accommodating holes.

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