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Vacuum purification method of polycrystalline diamond blank

A polycrystalline diamond, vacuum purification technology, used in metal processing equipment, transportation and packaging, etc., can solve the problems of weakening PDC performance and incomplete deoxidation, and achieve the effect of meeting synthesis requirements and avoiding weakening.

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

[0004] Aiming at the problem in the prior art that the PDC performance is weakened due to incomplete deoxygenation in the purification treatment method of polycrystalline diamond blanks, a vacuum purification method for polycrystalline diamond blanks is provided, which can not only meet the surface purification requirements of diamond particles, but also meet the Metal bond reduction requirements, the oxygen content of the diamond mixed powder in the polycrystalline diamond blank is determined by 300ppm or less decline as low as below 80ppm

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A method for vacuum purification of a polycrystalline diamond blank, comprising the steps of:

[0026] Step 1, putting the molybdenum crucible carrying the polycrystalline diamond blank into the vacuum heating furnace;

[0027] Step 2, pre-evacuate the vacuum heating furnace until the pressure in the furnace reaches 6×10 -2 Pa, keep the furnace pressure 6×10 -2 Pa and raise the temperature to 200°C within 20 minutes, keep it warm for 1 hour, and then continue to vacuumize while raising the temperature to 400°C within 30 minutes until the pressure in the furnace is stable at 3×10 -3 Pa, stop vacuuming;

[0028] Step 3, while holding the temperature at 400°C for 1.5 hours, intermittently fill the vacuum heating furnace with hydrogen and vacuumize. The specific process of the intermittent hydrogen filling and vacuumize is: first fill the vacuum heating furnace Fill in a fixed amount of hydrogen gas (the fixed amount of gas is based on the furnace pressure of 60Mbar, and...

Embodiment 2

[0033] A polycrystalline diamond blank vacuum purification method, the method comprises the steps of:

[0034] Step 1, putting the molybdenum crucible carrying the polycrystalline diamond blank into the vacuum heating furnace;

[0035] Step 2, pre-evacuate the vacuum heating furnace until the pressure in the furnace reaches 4×10 -2 Pa, keep the furnace pressure 4×10 -2 Pa and raise the temperature to 250°C within 30 minutes, keep it warm for 1.5 hours, and then continue to vacuumize while raising the temperature to 500°C within 40 minutes until the pressure in the furnace is stable at 2×10 -3 Pa;

[0036] Step 3, stop vacuuming, and under the condition of 500°C for 2.5 hours, intermittently fill the vacuum heating furnace with hydrogen and vacuumize. The specific process of the intermittent filling with hydrogen and vacuumize is as follows: Fill the heating furnace with a fixed amount of hydrogen gas (the fixed amount of gas is limited to the furnace pressure of 120Mbar, an...

Embodiment 3

[0041] A polycrystalline diamond blank vacuum purification method, the method comprises the steps of:

[0042] Step 1, putting the molybdenum crucible carrying the polycrystalline diamond blank into the vacuum heating furnace;

[0043] Step 2, pre-evacuate the vacuum heating furnace until the pressure in the furnace reaches 2×10 -2 Pa, keep the furnace pressure 2×10 -2 Pa and raise the temperature to 225°C within 25min, keep it warm for 1.25 hours, then continue to vacuumize, and raise the temperature to 450°C within 35min until the pressure in the furnace is stable at 1×10 -3 Pa, stop vacuuming;

[0044] Step 3: While holding the temperature at 450°C for 2 hours, the vacuum heating furnace is intermittently filled with hydrogen and vacuumized. The specific process of the intermittent hydrogen filling and vacuumized treatment is as follows: Fill in a fixed amount of hydrogen (the fixed amount of gas is limited to the furnace pressure of 90Mbar, and the purity of the filled ...

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Abstract

The invention provides a vacuum purification method of a polycrystalline diamond blank. A molybdenum crucible loaded with the polycrystalline diamond blank is put in a vacuum sintering furnace; when the temperature is increased to 200 to 250 DEG C and the air pressure in the furnace reaches 6*10<-2> Pa, the polycrystalline diamond blank is degassed and dehydrated; when the temperature is increased to 400 to 500 DEG C and the air pressure in the furnace reaches 3*10<-3> Pa, vacuum reduction treatment is performed on the polycrystalline diamond blank with hydrogen for the first time; when the temperature is increased to 650 to 750 DEG C and the air pressure in the furnace reaches 3*10<-3> Pa, vacuum reduction treatment is performed on the polycrystalline diamond blank with carbonic oxide for the second time; and after purification treatment, the oxygen content of diamond mixed powder in the polycrystalline diamond blank is less than or equal to 80 ppm, the surface of the diamond mixed powder in the polycrystalline diamond blank is extremely cleaned, and the synthesis requirement of high-grade polycrystalline diamond compacts is satisfied.

Description

technical field [0001] The invention belongs to the technical field of polycrystalline diamond production, and in particular relates to a vacuum purification method for polycrystalline diamond blanks. Background technique [0002] In the ultra-high pressure and high temperature synthesis of polycrystalline diamond compact (PDC), the purity of the metal binder in the polycrystalline diamond blank and the surface state of the diamond powder will directly affect the performance of PDC. In the process of preparing polycrystalline diamond blanks, since diamond is a fine-grained powder obtained by crushing, its surface is no longer smooth but rough and uneven, so the surface area is large, the specific surface energy is high, and the surface has a very strong ability to absorb impurities such as gases; at the same time , the particle size of the metal binder is also very fine, the surface area is large, and the specific surface energy is high. Especially when the air temperature i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F9/22
CPCB22F9/22B22F1/145
Inventor 卢灿华张涛窦明刘俊涛朱培
Owner ZHONGNAN DIAMOND CO LTD
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