Ultrahigh pressure pyrophyllite assembly block

Abstract

The invention discloses an ultra-high pressure pyrophyllite assembly block, comprising a pyrophyllite body in the form of a regular polyhedron, a high pressure mold cavity penetrating the pyrophyllite body is arranged on the pyrophyllite body, steel pads, conductive steel rings, boosting columns, and boosting pipes are arranged at both ends of the high pressure mold cavity from outside to inside, and a heating component for heating a sample to be synthesized is arranged inside the boosting pipe. The invention is easy to operate, has high pressure transmission efficiency, and can increase the internal effective pressure of the pyrophyllite block assembly structure.

Description

Technical Field

[0001] The invention relates to a pyrophyllite assembly block for synthesis, in particular to an ultra-high pressure pyrophyllite assembly block. Background Art

[0002] In the process of superhard material synthesis, the static pressure catalyst method of a six-sided top press with a pyrophyllite synthesis mold is mainly used. The main functions of the pyrophyllite material are pressure transmission, sealing and heat preservation. When using this method to increase the pressure, the maximum pressure of the pyrophyllite synthesis cavity has never been able to break through 6GPa. The commonly used assembly block synthesis cavity can produce a high pressure of 5.0-5.5GPa. Continuing to increase the synthesis pressure will affect the service life of the six-sided top press synthesis equipment and its auxiliary accessories, especially increase the consumption of the top hammer, which not only increases the production cost, but also poses certain safety hazards. Therefore, it is necessary to improve the existing technology to solve the above technical problems. Summary of the invention

[0003] In view of this, the present invention provides an ultra-high pressure pyrophyllite assembly block, which is easy to operate, has high pressure transmission efficiency, and can increase the internal effective pressure of the pyrophyllite block assembly structure. Specifically, it is achieved through the following technical solutions:

[0004] The ultra-high-pressure pyrophyllite assembly block described in the present invention comprises a pyrophyllite body in the form of a regular polyhedron, a high-pressure mold cavity penetrating the pyrophyllite body is arranged on the pyrophyllite body, steel pads, conductive steel rings, boosting columns, and boosting tubes are arranged at both ends of the high-pressure mold cavity from the outside to the inside in sequence, and a heating component for heating a sample to be synthesized is arranged inside the boosting tube; the high-pressure mold cavity is cylindrical or prismatic, and the boosting tube is cylindrical or prismatic matching the high-pressure mold cavity; the boosting column is stepped; one end of the boosting column is in contact with the conductive steel ring, and the other end of the boosting column is inserted into the inside of the boosting tube and in contact with the heating component Fitting; a talc ring I is arranged at the step on the boost column, and the talc ring I is located between the boost column and the boost tube; the boost tube includes a tungsten carbide tube and a magnesium oxide tube, and the magnesium oxide tube is located inside the tungsten carbide tube; the talc body, the tungsten carbide tube and the heating component are fitted in sequence; the heating component includes a heating tube arranged in the magnesium oxide tube, and a heating plate is arranged between the heating tube and the boost column; after the heating tube and the heating plate are installed, a closed cavity for containing samples is formed; the material of the boost column is preferably tungsten carbide, and can also be tungsten, molybdenum, titanium or iron and their alloys.

[0005] Furthermore, a salt tube is arranged between the sample and the heating tube, and salt sheets and mica are arranged in sequence from the outside to the inside between the sample and the heating plate.

[0006] Furthermore, the wall thickness of the tungsten carbide tube is greater than 5 mm, and the wall thickness of the magnesium oxide tube is less than 3 mm.

[0007] Furthermore, a pyrophyllite ring II is arranged outside the conductive steel ring, and the outer surface of the boost column coincides with the surface after the conductive steel ring and the pyrophyllite ring II are installed.

[0008] Beneficial effects of the present invention: the boost column and boost pipe of the present invention are both arranged in the high-pressure mold cavity of the pyrophyllite body and are closer to the sample and are in the same high-pressure mold cavity as the sample, so the effect of increasing the pressure is good; the boost pipe is cylindrical or prismatic, and it "fully wraps" the sample to increase the synthetic pressure of the sample; the boost column and boost pipe can be reused, and are economical. Other beneficial effects of the present invention will be further described in conjunction with the specific embodiments below. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0010] Figure 1 It is a schematic diagram of the structure of the present invention;

[0011] In the figure: 1. pyrophyllite body; 2. steel pad; 3. conductive steel ring; 4. pyrophyllite ring II; 5. booster column; 6. pyrophyllite ring I; 7. tungsten carbide tube; 8. magnesium oxide tube; 9. heating plate; 10. heating tube; 11. salt tube; 12. salt sheet; 13. mica; 14. sample. DETAILED DESCRIPTION

[0012] like Figure 1 As shown: the ultra-high pressure pyrophyllite assembly block described in this embodiment includes a pyrophyllite body 1 in the form of a regular polyhedron, a high pressure mold cavity penetrating the pyrophyllite body is provided on the pyrophyllite body 1, and steel pads 2, conductive steel rings 3, booster columns 5, and booster tubes are sequentially provided at both ends of the high pressure mold cavity from outside to inside, and a heating component for heating the sample to be synthesized is provided inside the booster tube. The material of the booster column 5 is preferably tungsten carbide, and of course it can also be tungsten, molybdenum, titanium or iron and alloys thereof.

[0013] In this embodiment, the boost column 5 is in a stepped shape; one end of the boost column 5 is in contact with the conductive steel ring 3, and the other end of the boost column 5 is inserted into the boost tube and is in contact with the heating component; a pyrophyllite ring Ⅰ6 is provided at the step on the boost column 5, and the pyrophyllite ring Ⅰ6 is located between the boost column 5 and the boost tube. Preferably, the boost column 5 is in a "T" shape, and the two boost columns 5 are similar to the two-sided top pressure transmission structure and the pyrophyllite ring Ⅰ6 is added, which has high pressure transmission efficiency, can further increase the effective pressure inside the high-pressure mold cavity, and significantly improve the performance of the diamond or cubic boron nitride sintered body.

[0014] In this embodiment, the booster tube includes a tungsten carbide tube 7 and a magnesium oxide tube 8, and the magnesium oxide tube 7 is located inside the tungsten carbide tube 8; the pyrophyllite body 1, the tungsten carbide tube 7 and the heating assembly are sequentially attached. The tubular design of the tungsten carbide tube 7 and the magnesium oxide tube 8 cooperates with the "T"-shaped booster column 5 and the pyrophyllite ring Ⅰ 6 to form a sealed closed chamber for the sample, which has excellent sealing performance for the sample 14 while efficiently transmitting pressure, which is conducive to synthesizing the target material with stable performance.

[0015] In this embodiment, the heating assembly includes a heating tube 10 disposed in a magnesium oxide tube, and a heating plate 9 is disposed between the heating tube 10 and the boost column 5; after the heating tube 10 and the heating plate 9 are installed, they form a closed cavity for containing the sample 14. Furthermore, the heating tube and the heating plate are preferably carbon tubes or carbon plates, and the heating tube 10 and the heating plate 9 can heat the sample 14 while sealing the sample 14 to further improve the sealing performance.

[0016] In this embodiment, a salt tube 11 is provided between the sample 14 and the heating tube 10, and a salt sheet 12 and a mica 13 are provided in sequence from outside to inside between the sample 14 and the heating sheet 9. The mica 13 is provided to prevent the samples 14 from sticking to each other and the sample 14 from sticking to the salt. The salt tube 11 and the salt sheet 9 melt under high temperature and high pressure, which can realize uniform pressure transmission, and at the same time, can isolate the sample from contact with the outside to prevent contamination of the sample.

[0017] In this embodiment, the wall thickness of the tungsten carbide tube 7 is greater than 5 mm, and the wall thickness of the magnesium oxide tube 8 is less than 3 mm. Setting the thickness of the tungsten carbide tube to be greater than 5 mm ensures that the tungsten carbide tube 7 is not squeezed or deformed under high pressure, and setting the thickness of the magnesium oxide tube 8 to be no greater than 3 mm not only plays a role in heat preservation, but also provides an appropriate space for the sample 14.

[0018] In this embodiment, a pyrophyllite ring II 4 is arranged outside the conductive steel ring 3, and the outer surface of the boost column coincides with the surface after the conductive steel ring 3 and the pyrophyllite ring II 4 are installed. The pyrophyllite ring II 4 is arranged at the outer end of the high-pressure mold cavity and located inside the steel pad 2. Such a layered arrangement solves the technical problems of poor pressure transmission, heat preservation and sealing performance in the high-pressure mold cavity, and its excellent performance is better than that of the traditional pyrophyllite assembly block in pressure transmission, heat preservation and sealing performance.

[0019] In this embodiment, the high-pressure mold cavity is cylindrical or prismatic, and the booster tube is cylindrical or prismatic.

[0020] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. An ultra-high pressure pyrophyllite assembly block, comprising a pyrophyllite body in the form of a regular polyhedron, the pyrophyllite body being provided with a high pressure mold cavity penetrating the pyrophyllite body, characterized in that: The two ends of the high-pressure mold cavity are provided with steel pads, conductive steel rings, boosting columns and boosting tubes in sequence from the outside to the inside, and a heating component for heating the sample to be synthesized is arranged inside the boosting tube; the high-pressure mold cavity is cylindrical or prismatic, and the boosting tube is cylindrical or prismatic matching the high-pressure mold cavity; the boosting column is stepped; one end of the boosting column is fitted with the conductive steel ring, and the other end of the boosting column is inserted into the inside of the boosting tube and fits with the heating component; a pyrophyllite ring I is arranged at the step on the boosting column, and the pyrophyllite ring I is located between the boosting column and the boosting tube; the boosting tube includes a tungsten carbide tube and a magnesium oxide tube, and the magnesium oxide tube is located inside the tungsten carbide tube; the pyrophyllite body, the tungsten carbide tube and the heating component are fitted in sequence; the heating component includes a heating tube arranged in the magnesium oxide tube, and a heating plate is arranged between the heating tube and the boosting column; after the installation of the heating tube and the heating plate, a closed cavity for containing samples is formed; the material of the boosting column is tungsten, molybdenum, Titanium, iron or their alloys, or tungsten carbide.

2. The ultrahigh pressure pyrophyllite assembly block according to claim 1, characterized in that: A salt tube is arranged between the sample and the heating tube, and a salt sheet and mica are arranged in sequence from outside to inside between the sample and the heating sheet.

3. The ultra-high pressure pyrophyllite assembly block according to any one of claims 1 to 2, characterized in that: The wall thickness of the tungsten carbide tube is greater than 5 mm, and the wall thickness of the magnesium oxide tube is less than 3 mm.

4. The ultra-high pressure pyrophyllite assembly block according to any one of claims 1 to 2, characterized in that: A pyrophyllite ring II is arranged outside the conductive steel ring, and the outer surface of the boost column coincides with the surface after the conductive steel ring and the pyrophyllite ring II are installed.

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