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Synthetic block of polycrystalline diamond composite sheet and method for synthesizing polycrystalline diamond composite sheet

A polycrystalline diamond and composite sheet technology, which is applied in the field of superhard material manufacturing, can solve the problems of inconsistent sintering degree between the center and edge of the diamond polycrystalline layer, obvious pressure and temperature gradients, and large performance differences, so as to reduce further loss , reduce heat transfer, good thermal insulation performance

Active Publication Date: 2021-01-29
ZHONGNAN DIAMOND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, when the polycrystalline diamond composite sheet is synthesized by the six-sided top press, the heating method is an indirect heating method. Since the indirect heating method is to heat up the inner cavity of the tube by radiating heat from the heating tube wall, this heating method is used in the polycrystalline diamond composite sheet. There is a certain temperature gradient in the radial direction of the layer, especially when synthesizing a polycrystalline diamond composite sheet with a large diameter, the pressure and temperature gradient of the synthesis cavity are relatively obvious, which makes the sintering degree of the center and edge of the diamond polycrystalline layer inconsistent, resulting in performance differences. Larger, or when synthesizing multiple distributed polycrystalline diamond compacts in the same heating chamber, there is also the problem of large differences in synthesis quality between polycrystalline diamond compacts in the same heating chamber

Method used

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  • Synthetic block of polycrystalline diamond composite sheet and method for synthesizing polycrystalline diamond composite sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Simultaneously synthesize two polycrystalline diamond composite blocks at one time, such as figure 1 As shown, it includes a cylindrical synthetic cavity layer 8, a synthetic casing and an isolation layer 10. The synthetic cavity layer 8 is located in a hollow columnar synthetic casing, and the top and bottom of the synthetic cavity layer 8 are symmetrically provided with a conductive thermal insulation layer and Conductive pressure transmission layer, the middle part of the synthesis chamber layer 8 is provided with a synthesis stem 14, and a synthesis chamber is arranged around the synthesis stem 14, the synthesis chamber is located in the volume surrounded by the isolation layer 10, and the synthesis chamber is used to place the Crystalline diamond composite sheet stock 11, the top and bottom of the synthesis chamber are provided with insulating sheets 12, the top and bottom of the isolation layer 10 are provided with pressure transmission sheets 13, between the isola...

Embodiment 2

[0038] A kind of method utilizing synthetic block described in embodiment 1 to synthesize polycrystalline diamond compact, comprises the following steps:

[0039] 1) Place the pyrophyllite block 7 and the pyrophyllite ring 3 in a vacuum sintering furnace, and evacuate until the pressure in the furnace reaches 3×10 - 2 Below Pa, heat to 280°C and keep it warm for 36 hours; the insulating sheet 12 is baked at 720°C for 8 hours, and set aside;

[0040] 2) Carry out resistance classification for the resistance of the heating tube 9, and the resistance error between the heating tubes 9 of the same type and the same specification material is not more than 1%;

[0041] 3) Place the polycrystalline diamond compact blank 11 in a vacuum sintering furnace, and roughly evacuate until the pressure in the furnace reaches 7×10 -2 Below Pa, heat to 180°C for 1 hour, then continue vacuuming and heat to 700°C until the pressure inside the furnace is stable at 3×10 -3 Below Pa, then stop vacu...

Embodiment 3

[0051] A kind of method utilizing synthetic block described in embodiment 1 to synthesize polycrystalline diamond compact, comprises the following steps:

[0052] 1) Place the pyrophyllite block 7 and the pyrophyllite ring 3 in a vacuum sintering furnace, and evacuate until the pressure in the furnace reaches 3×10 - 2 Below Pa, heat to 260°C and keep it warm for 48 hours; the insulating sheet 12 is baked at 750°C for 6 hours, and set aside;

[0053] 2) Carry out resistance classification for the resistance of the heating tube 9, and the resistance error between the heating tubes 9 of the same type and the same specification material is not more than 1%;

[0054] 3) Place the polycrystalline diamond compact blank 11 in a vacuum sintering furnace, and roughly evacuate until the pressure in the furnace reaches 7×10 -2 Below Pa, heat to 150°C for 1 hour, then continue vacuuming and heat to 650°C until the pressure inside the furnace is stable at 3×10 -3 Below Pa, then stop vacu...

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Abstract

A polycrystalline diamond composite sheet synthesis block and a method for synthesizing the polycrystalline diamond composite sheet belong to the technical field of superhard material manufacturing. The synthesis block includes a cylindrical synthesis cavity layer, a synthesis case and an isolation layer. The synthetic chamber layer is located in a hollow columnar synthetic shell, and the top and bottom of the synthetic chamber layer are symmetrically provided with a conductive thermal insulation layer and a conductive pressure transmission layer. The middle part of the synthetic chamber layer is provided with a synthetic core column, and a synthetic cavity, the synthesis cavity is located in the volume surrounded by the isolation layer, the synthesis cavity is used to place the polycrystalline diamond compact blank, the top and bottom of the synthesis cavity are provided with insulating sheets, the top and bottom of the isolation layer A pressure transmission sheet is provided, and a plurality of heating tubes are arranged at intervals between the isolation layer and the synthetic core column, and between the isolation layer and the synthetic cavity layer. The heights of the heating tubes, the synthetic cavity layer and the synthetic core column are the same. The material of the synthetic casing is pyrophyllite.

Description

technical field [0001] The invention belongs to the technical field of superhard material manufacture, and in particular relates to a synthetic block of a polycrystalline diamond composite sheet and a method for synthesizing the polycrystalline diamond composite sheet. Background technique [0002] Polycrystalline diamond composite sheet is a kind of superhard composite material made of diamond powder as raw material, which is firmly combined with cemented carbide substrate under high temperature and high pressure conditions; because it has both the high hardness and high resistance of diamond It is not only abrasive, but also has the high toughness and weldability of cemented carbide. Therefore, it is widely used in oil and gas field mining, mineral deposit exploration, cutting processing and other fields. [0003] The polycrystalline diamond composite sheet is synthesized on a six-sided top press by static high temperature and high pressure method. The uniformity and reaso...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F7/04B22F7/08B22F3/14B22F3/10
CPCB22F3/101B22F3/14B22F7/04B22F7/08B22F2998/00B22F3/1007B22F2201/01B22F2201/20
Inventor 张涛卢灿华刘俊涛窦明朱培
Owner ZHONGNAN DIAMOND CO LTD
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