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A polycrystalline diamond composite pick synthetic block and a method for synthesizing the same

A technology of polycrystalline diamond and composite picks, applied in the field of superhard material manufacturing, can solve the problems of low performance, unstable quality, and can not meet the synthesis needs of polycrystalline diamond composite picks, and achieves the effect of solving low performance.

Active Publication Date: 2019-01-15
ZHONGNAN DIAMOND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, when the traditional synthetic block assembly structure is used to synthesize polycrystalline diamond composite picks, due to its relatively large length and diameter, the synthesized polycrystalline diamond composite picks are prone to problems of unstable quality and poor performance.
Therefore, the traditional synthetic block assembly structure cannot meet the synthesis needs of polycrystalline diamond composite picks with large length-to-diameter ratios.

Method used

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  • A polycrystalline diamond composite pick synthetic block and a method for synthesizing the same
  • A polycrystalline diamond composite pick synthetic block and a method for synthesizing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Such as figure 1 As shown, a polycrystalline diamond composite pick synthesis block includes a synthesis cavity for high temperature and high pressure sintering polycrystalline diamond composite pick blank 16, and the side walls of the synthesis cavity are sequentially provided with isolation layers from the inside to the outside 11. Heating layer, thermal insulation layer 15 and cylindrical shell, the top of the synthesis cavity is provided with a conductive layer and a conductive pressure transmission layer I sequentially from the inside and outside, and the bottom of the synthesis cavity is provided with a conductive pressure transmission layer II; Polycrystalline diamond composite pick blank 16 and isolation cap 17 are provided in the synthesis cavity, and the isolation cap is located on the top of polycrystalline diamond composite pick blank, and the heating layer is composed of heating tube 18, connecting gasket 9 and Composed of heating pipe II 10, the outer diam...

Embodiment 2

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

[0039] 1) Put the pyrophyllite block 1, pyrophyllite ring I2 and pyrophyllite ring II14 in a vacuum sintering furnace, and vacuumize until the pressure in the furnace reaches 3×10 -3 Below Pa, heat to 380°C for 20h, and set aside;

[0040] 2) Place the polycrystalline diamond composite pick blank 16 in a vacuum sintering furnace, and roughly evacuate until the pressure in the furnace reaches 6×10 -2 Below Pa, heat to 180°C for 1 hour, then continue vacuuming and heat to 900°C until the pressure inside the furnace is stable at 3×10 -3 Below Pa, then stop vacuuming and fill the vacuum heating furnace with a mixed gas with a pressure of 150Mbar at 900°C to reduce the composite sheet blank for 5 hours, and then vacuumize to the furnace pressure of 3×10 -3 Below Pa; where:

[0041] The mixed gas is carbon dioxide and h...

Embodiment 3

[0046] A kind of method utilizing synthetic block described in embodiment 1 to synthesize polycrystalline diamond composite pick, comprises the following steps:

[0047] 1) Put the pyrophyllite block 1, pyrophyllite ring I2 and pyrophyllite ring II14 in a vacuum sintering furnace, and vacuumize until the pressure in the furnace reaches 3×10 -3 Below Pa, heat to 350°C for 25 hours, and set aside;

[0048] 2) Place the polycrystalline diamond composite pick blank 16 in a vacuum sintering furnace, and roughly evacuate until the pressure in the furnace reaches 6×10 -2 Below Pa, heat to 150°C for 1 hour, then continue vacuuming and heat to 950°C until the pressure inside the furnace is stable at 3×10 -3 Below Pa, then stop vacuuming and fill the vacuum heating furnace with a mixed gas with a pressure of 100Mbar at 950°C to reduce the composite sheet blank for 6 hours, and then vacuumize to the furnace pressure of 3×10 -3 Below Pa; where:

[0049] The mixed gas is carbon dioxide ...

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Abstract

The invention discloses a polycrystalline diamond composite pick synthetic block and a method for synthesizing the same. The polycrystalline diamond composite pick synthetic block comprises a synthetic cavity for high-temperature and high-pressure sintering of polycrystalline diamond composite pick blank, wherein the side walls of the synthetic cavity are sleeved with an isolation layer, a heatinglayer, an insulating layer and a cylindrical shell from the inside to the outside, the top of the synthetic cavity is provided with an electrically conductive layer and an electrically conductive pressure transmitting layer I from the inside to the outside, and the bottom of the synthetic cavity is provided with an electrically conductive pressure transmitting layer II; the synthetic cavity is provided with a polycrystalline diamond composite sheet blank and an isolation cap; the heat generating layer is composed of a heat generating pipe I, a connecting washer and a heat generating pipe II;the outer diameter of the heat generating pipe II is larger than the heat generating pipe I; the outer diameter of the heat generating pipe II is the same as that of the connecting washer; and the cylindrical shell is a pyrophyllite block.

Description

technical field [0001] The invention belongs to the technical field of superhard material manufacture, and in particular relates to a polycrystalline diamond composite pick synthesis block and a method for synthesizing the polycrystalline diamond composite pick. Background technique [0002] The polycrystalline diamond composite pick adopts high-temperature and high-pressure technology on the diamond synthesis press, and the diamond is composited on the surface of the cemented carbide button, forming a thin diamond layer with good wear resistance on it. The impact toughness makes it have good impact toughness. As the cutting teeth of road milling machine (roadheader), it participates in the cutting of asphalt concrete pavement, and plays a vital role in the milling of highway asphalt concrete pavement and municipal maintenance operations. [0003] At present, when the traditional synthetic block assembly structure is used to synthesize polycrystalline diamond composite pick...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E01C23/088B22F5/00
CPCB22F5/00B22F2005/001E01C23/088
Inventor 卢灿华张涛窦明刘俊涛宋子衡
Owner ZHONGNAN DIAMOND CO LTD
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