CN211754767U

CN211754767U - PCBN composite sheet synthesis cavity

Info

Publication number: CN211754767U
Application number: CN201922468281.4U
Authority: CN
Inventors: 王丽; 李和鑫; 孔帅斐; 李麟
Original assignee: Funik Ultrahard Material Co Ltd
Current assignee: Funik Ultrahard Material Co Ltd
Priority date: 2019-12-31
Filing date: 2019-12-31
Publication date: 2020-10-27
Anticipated expiration: 2029-12-31

Abstract

The utility model provides a compound piece synthetic cavity of PCBN, including offering the pyrophyllite biography briquetting of well cavity, its characterized in that: conductive steel rings are symmetrically arranged at two ends of the hollow cavity of the pyrophyllite pressure transmission block; the graphite heating pipe is arranged between the two layers of conductive steel rings and is in contact with the conductive steel rings, a metal cup is arranged in the graphite heating pipe, and dolomite sheets, graphite sheets and magnesium oxide sheets are sequentially arranged at the bottom of the metal cup from bottom to top. This compound piece synthetic cavity of PCBN utilizes magnesium oxide piece, graphite flake, dolomite piece three's organic combination to make temperature field and pressure field more homogeneous stable in the synthetic cavity. Consequently this compound piece synthetic cavity of PCBN makes temperature field and pressure field homogeneous more stable during the synthesis, and the compound piece deflection of PCBN that makes the synthesis come out is little, and inside bed of material deviation is little, does benefit to later stage processing and use.

Description

PCBN composite sheet synthesis cavity

Technical Field

The utility model relates to a superhard materials high pressure synthesis technical field, specific theory has related to a compound piece synthetic cavity of PCBN.

Background

The polycrystalline cubic boron nitride composite sheet is formed by sintering CBN micro powder and a hard alloy substrate under the condition of ultrahigh pressure and high temperature, has the high wear resistance of a superhard material and the high impact resistance of hard alloy, but is more difficult to synthesize when the diameter is larger, and the temperature field and the pressure field in a synthesis cavity are more uneven, so that the assembling mode of the synthesis cavity is extremely important.

A structure for assembling a synthetic cavity is disclosed in the utility model patent with the application number of CN201520501918.4 entitled "cavity assembly for synthetic diamond and cubic boron nitride sintered body". The assembly structure comprises a pyrophyllite composite block, a graphite heating pipe, a magnesium oxide cup, an iron cup, a graphite cup, a molybdenum cup and a niobium cup, wherein the molybdenum cup and the niobium cup are oppositely buckled. The assembly method is complex and the effective utilization space is small. When the cavity contains more graphite substances, the synthesized resistance is increased, and the resistance shows a multiplication trend along with the increase of the size of the graphite substances, so that the fluctuation of power is increased, the synthesized voltage is increased, and great risk is brought.

In order to solve the above problems, people are always seeking an ideal technical solution.

Disclosure of Invention

The utility model aims at providing a compound piece synthetic cavity of PCBN to the not enough of prior art.

In order to realize the purpose, the utility model discloses the technical scheme who adopts is: a PCBN composite sheet synthesis cavity comprises a pyrophyllite transmission pressing block provided with a hollow cavity, wherein conductive steel rings are symmetrically arranged at two ends of the hollow cavity of the pyrophyllite transmission pressing block; the graphite heating pipe is arranged between the two layers of conductive steel rings and is in contact with the conductive steel rings, a metal cup is arranged in the graphite heating pipe, and dolomite sheets, graphite sheets and magnesium oxide sheets are sequentially arranged at the bottom of the metal cup from bottom to top.

Based on the above, a hard alloy matrix is arranged at the opening at the top of the metal cup, and a molding cavity is formed between the hard alloy matrix and the magnesium oxide sheet.

Based on the above, the two metal cups are arranged in the graphite heating pipe, and are symmetrically arranged in the graphite heating pipe in a manner that the top openings are abutted.

Based on the above, the thickness of the magnesium oxide sheet is 0.5mm to 2.5 mm.

Based on the above, the graphite sheet has a thickness of 0.1 mm to 1.0 mm.

Based on the above, the thickness of the dolomite is 0.5mm to 2.5 mm.

Wherein the dolomite powder with the mass percentage content of 1-10% is doped in the magnesium oxide sheet.

The utility model discloses relative prior art has substantive characteristics and progress, specific theory, the utility model provides a compound piece synthetic cavity of PCBN is including having pyrophyllite piece or compound piece, electrically conductive steel ring, graphite heating pipe, magnesium oxide cup, dolomite piece, magnesium oxide piece, graphite flake, the metal box constitution of well cavity, electrically conductive steel ring and pyrophyllite apron are fixed in the pyrophyllite piece or compound piece with the built-up part in, and each subassembly closely cooperates, plays good biography pressure heat preservation effect.

Furthermore, the magnesium oxide sheet is doped with 1 to 10 percent of dolomite powder, and the dolomite powder is doped in a certain proportion, so that the magnesium oxide sheet has the function of heat preservation and pressure transmission. Under high temperature and high pressure, the whole metal box is deformed due to the different linear expansion coefficients of the cubic boron nitride and the hard alloy. The magnesium oxide sheet is ceramic hard particles and is placed next to the metal cup, so that the deformation of the metal cup can be prevented to a great extent, and the pressure and the temperature on the metal cup are balanced. The graphite flake has the main function of balancing the temperature in the high-temperature high-pressure synthesis cavity, and the dolomite releases certain gas under the high-temperature high-pressure to play a role in balancing the pressure. The organic combination of the magnesium oxide sheet, the graphite sheet and the dolomite sheet ensures that the temperature field and the pressure field in the synthetic cavity are more uniform and stable.

Therefore, the utility model provides a compound piece synthetic cavity of PCBN makes temperature field and pressure field homogeneous more stable during the synthesis, and the compound piece deflection of PCBN that makes the synthesis come out is little, and inside material layer deviation is little, does benefit to later stage processing and use.

Drawings

Fig. 1 is the utility model provides a compound piece synthetic cavity overall structure of PCBN sketch map.

Fig. 2 is the utility model provides a compound piece synthetic cavity local structure sketch map of PCBN.

In the figure: 1. pressing block for pyrophyllite; 2. a graphite heating pipe; 3. a conductive steel ring; 4. a cemented carbide substrate; 5. a metal cup; 6. a magnesium oxide sheet; 7. a graphite sheet; 8. dolomite chips; 9. and (5) forming a cavity.

Detailed Description

The technical solution of the present invention will be described in further detail through the following embodiments.

Example 1

As shown in fig. 1 and 2, the present embodiment provides a PCBN composite sheet synthesis cavity, which includes a pyrophyllite pressure-transmitting block 1 having a hollow cavity, wherein conductive steel rings 3 are symmetrically disposed at two ends of the hollow cavity of the pyrophyllite pressure-transmitting block 1; a graphite heating pipe 2 which is contacted with the conductive steel ring 3 is arranged between the two layers of conductive steel rings 3, a metal cup 5 is arranged in the graphite heating pipe 2, and a dolomite sheet 8, a graphite sheet 7 and a magnesium oxide sheet 6 are sequentially arranged at the bottom of the metal cup 5 from bottom to top.

The top opening of the metal cup 5 is provided with a hard alloy matrix 4, and a molding cavity 9 is formed between the hard alloy matrix 4 and the magnesium oxide sheet 6.

In this embodiment, two metal cups 5 are disposed inside the graphite heating pipe 2, and the two metal cups 5 are symmetrically disposed inside the graphite heating pipe 2 in a manner that top openings are abutted.

Specifically, the thickness of the magnesium oxide sheet 6 is 0.5 mm. The graphite sheet 7 has a thickness of 1.0 mm. The thickness of the dolomite 8 is 2.5 mm. The magnesium oxide sheet is doped with dolomite powder with the mass percentage of 10%.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention and not to limit it; although the present invention has been described in detail with reference to preferred embodiments, it should be understood by those skilled in the art that: the invention can be modified or equivalent substituted for some technical features; without departing from the spirit of the present invention, it should be understood that the scope of the claims is intended to cover all such modifications and variations.

Claims

1. The utility model provides a compound piece synthetic cavity of PCBN, passes the briquetting, its characterized in that including the pyrophyllite of seting up well cavity: conductive steel rings are symmetrically arranged at two ends of the hollow cavity of the pyrophyllite pressure transmission block; the graphite heating pipe is arranged between the two layers of conductive steel rings and is in contact with the conductive steel rings, a metal cup is arranged in the graphite heating pipe, and dolomite sheets, graphite sheets and magnesium oxide sheets are sequentially arranged at the bottom of the metal cup from bottom to top.

2. The PCBN compact synthesis cavity of claim 1, wherein: a hard alloy matrix is arranged at the opening at the top of the metal cup, and a molding cavity is formed between the hard alloy matrix and the magnesium oxide sheet.

3. The PCBN compact synthesis cavity of claim 2, wherein: the two metal cups are arranged in the graphite heating pipe and are symmetrically arranged in the graphite heating pipe in a manner that the top openings of the two metal cups are abutted.

4. The PCBN compact synthesis cavity of claim 3, wherein: the thickness of the magnesium oxide sheet is 0.5 mm-2.5 mm.

5. The PCBN compact synthesis cavity of claim 4, wherein: the thickness of the graphite sheet is 0.1 mm-1.0 mm.

6. The PCBN compact synthesis cavity of claim 5, wherein: the thickness of the dolomite is 0.5 mm-2.5 mm.