Polycrystalline diamond compact and synthetic block thereof

A technology of polycrystalline diamond and composite sheet, which is applied in the application of ultra-high pressure process and other directions, can solve the problems of weakening, inability to realize rigid pressure transmission, and large pressure loss, etc., to reduce temperature difference, avoid defect points, and uniform composite interface consistent effect

Active Publication Date: 2017-11-21
ZHONGNAN DIAMOND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the limitations of its material itself, pyrophyllite cannot achieve rigid pressure transmission, and the pressure loss during the pressure transmi

Method used

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  • Polycrystalline diamond compact and synthetic block thereof
  • Polycrystalline diamond compact and synthetic block thereof
  • Polycrystalline diamond compact and synthetic block thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Such as Figures 1 to 3 As shown, a synthetic block for polycrystalline diamond compacts includes a synthetic cavity 9 for extruding and sintering polycrystalline diamond blanks, the synthetic cavity 9 is used to place polycrystalline diamond blanks, and the synthetic cavity 9 is sequentially Encapsulation with isolation, heat generation, insulation, and extruded shells:

[0035] The isolation layer includes a cylindrical salt tube 8 that is axially sleeved outside the synthesis chamber 9. The two ports of the salt tube 8 are encapsulated by salt sheets 10, and the outer dimensions of the salt sheet 10 are the same as those of the salt tube 8. The outer dimension of the salt tube 8 and the salt sheet 10 together constitute the isolation layer, and the space in the isolation layer is the synthesis chamber 9. In the present invention, the salt tube 8 and the salt sheet 10 are both made of NaCl. The reason for choosing NaCl The reason is: during the high temperature and h...

Embodiment 2

[0042] A kind of polycrystalline diamond composite sheet that utilizes the synthetic block described in embodiment 1 to prepare, the concrete preparation process of polycrystalline diamond composite sheet comprises the following steps:

[0043] 1) The pyrophyllite block 13 is sintered, the specific process is as follows: first raise the temperature to 180-230°C and keep it warm for 1-2 hours, then raise the temperature to 250-270°C and keep it warm for 4-6 hours, then raise the temperature to 280-300°C ℃ and keep it warm for 2 to 3 hours, and finally cool down to room temperature, that is to say, it is completed.

[0044] 2) Purify the polycrystalline diamond composite sheet blank, the specific process is: put the polycrystalline diamond composite sheet blank in a vacuum sintering furnace, and evacuate until the pressure in the furnace is 3×10 -3 Pa, at 3×10 -3 Under the condition of Pa, raise the temperature to 450-500°C and keep it warm for 0.5-1h, then fill the furnace wit...

Embodiment 3

[0051] A kind of preparation method of polycrystalline diamond composite sheet, it utilizes the synthetic block described in embodiment 1 to finish, and concrete preparation process comprises the following steps:

[0052] 1) The pyrophyllite block 13 is sintered, the specific process is as follows: first raise the temperature to 180-230°C and keep it warm for 1-2 hours, then raise the temperature to 250-270°C and keep it warm for 4-6 hours, then raise the temperature to 280-300°C ℃ and keep it warm for 2 to 3 hours, and finally cool down to room temperature, that is to say, it is completed.

[0053] 2) Purify the polycrystalline diamond composite sheet blank, the specific process is: put the polycrystalline diamond composite sheet blank in a vacuum sintering furnace, and evacuate until the pressure in the furnace is 3×10 -3 Pa, at 3×10 -3 Under the condition of Pa, raise the temperature to 450-500°C and keep it warm for 0.5-1h, then fill the furnace with hydrogen until the pr...

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PUM

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Abstract

The invention provides a polycrystalline diamond compact and a synthetic block thereof. The synthetic block comprises a synthetic cavity for extruding and sintering a polycrystalline diamond blank and is characterized in that an isolation layer, a heating layer, a thermal-insulation layer and an extrusion shell are sequentially arranged outside the synthetic cavity in an encapsulated manner, the heating layer comprises a cylindrical heating element sleeving the isolation layer along an axial direction, the middle portion of the heating element corresponds to the middle portion of the synthetic cavity, and the heating quantity of the middle portion of heating element is lower than that of the two ends of the heating element; the middle portion of the heating element is preferably made of molybdenum, niobium, zirconium, titanium or tantalum, and the two ends of the heating element are preferably made of graphite. The synthetic block has the advantages that axial rigid pressure transfer is achieved, pressure loss is lowered evidently, the heating element is structurally improved, temperature gradient is avoided, the temperature in the synthetic block is even, the pressure in the synthetic block is stable and consistent, and the prepared compact is excellent in performance.

Description

technical field [0001] The invention belongs to the technical field of PDC blade preparation, and in particular relates to a polycrystalline diamond composite sheet and a composite block thereof. Background technique [0002] Polycrystalline diamond compact (PDC) is a superhard composite material made of diamond micropowder as raw material, cemented carbide as matrix, and sintered under high temperature and high pressure conditions through a specific assembly method. Due to its high wear resistance and high impact toughness, PDC is widely used as a cutting element for drill bits in fields such as oil and gas exploration and mineral deposit exploration. [0003] At present, when the traditional synthesis block synthesizes polycrystalline diamond compacts, the cavity inside the synthesis block should be in a stable environment of high temperature and high pressure, but due to the pressure loss caused by the pressure transmission element and the existence of temperature gradien...

Claims

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Application Information

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IPC IPC(8): B01J3/06
CPCB01J3/06B01J2203/0655
Inventor 张涛卢灿华刘俊涛窦明朱培
Owner ZHONGNAN DIAMOND CO LTD
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