CN215713386U - Device for removing cobalt from polycrystalline diamond compact - Google Patents
Device for removing cobalt from polycrystalline diamond compact Download PDFInfo
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- CN215713386U CN215713386U CN202120703837.8U CN202120703837U CN215713386U CN 215713386 U CN215713386 U CN 215713386U CN 202120703837 U CN202120703837 U CN 202120703837U CN 215713386 U CN215713386 U CN 215713386U
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Abstract
The utility model provides a device that polycrystalline diamond compact takes off cobalt, the effectual cobalt effect of taking off poor that has solved, the material is extravagant serious, the low scheduling problem of production efficiency, it includes the container, it takes off the cobalt reagent to fill in the container, it has the mould to soak in the cobalt reagent to take off, the lower surface equipartition of mould is equipped with a plurality of spacing holes, install polycrystalline diamond compact in the spacing hole, polycrystalline diamond compact includes diamond layer and alloy-layer, the alloy-layer is located the inside in spacing hole, the upper surface of mould is equipped with the air vent that communicates with spacing hole, first trachea and second trachea are connected with in proper order to the air vent upper end, air compressor and vacuum pump are put through respectively to the second trachea, the structure of the utility model is ingenious, easy operation, it is effectual to take off cobalt, work efficiency is high, the mould can cyclic utilization many times, and production cost is reduced.
Description
Technical Field
The utility model relates to the technical field of diamond compacts, in particular to a cobalt removing device for a polycrystalline diamond compact.
Background
The diamond compact is synthesized by diamond micropowder, bonding agent, carbide under high temperature and high pressure, and the reason that the abrasive resistance of the diamond compact is reduced in the working process mainly has two aspects: on one hand, the cobalt in the binding agent and the cobalt and diamond diffused into the composite sheet in the hard alloy have different thermal expansion coefficients, the composite sheet can generate great heat due to friction and impact, the mechanical property of the composite sheet is reduced due to microcracks generated by expansion with heat and contraction with cold and oxidation of the cobalt, and on the other hand, the existence of the cobalt at high temperature can promote the graphitization of the diamond in the composite sheet.
Diamond compact is through taking off cobalt and handling the back, because a large amount of cobalt are got rid of, make polycrystalline inside have hole and cavity, provide the space for diamond and residual cobalt thermal expansion, consequently, the inside residual stress of compound piece can reduce, the crackle also can reduce, the wearability of compound piece can increase substantially, it also demonstrates very big disadvantage in the aspect of the thermal stability with the compound piece that has taken off cobalt not take off cobalt, the reason is mainly because cobalt has very strong affinity with carbon, can catalyze graphite and change to the diamond under high temperature high pressure condition, and the diamond is the metastable state of carbon under the ordinary pressure, under high temperature condition, cobalt can impel diamond carbon to take place the reversion reaction to graphite carbon again, reduce the thermal stability performance of compound piece.
At present, there are three main methods for decobalting the composite sheet: acid washing for cobalt removal, gas cobalt removal and electrolysis for cobalt removal. Acid washing and cobalt removal are mainly carried out by utilizing the corrosivity and permeability of acid, and the acid enters the interior of the diamond crystal of the composite sheet to react with cobalt and a cobalt compound to form cobalt ions; the gas cobalt removal is usually carried out by introducing chlorine into a closed device at high temperature and high pressure (250-; the electrolytic cobalt removal mainly utilizes the basic working principle of electrolytic metal, takes the composite sheet as an electrolytic object, and removes the cobalt in the composite sheet by utilizing electrolyte, an electrolytic device, an inert cathode and the regulated voltage.
The acid pickling decobalting is mainly used in the current production, the diamond composite sheet is pressed into acid corrosion resistant high polymer molds such as polytetrafluoroethylene and the like, the diamond layer is contacted with acid liquor, incomplete contact is easily caused, the decobalting effect is poor, and the polymer molds need external force to press the composite sheet out of the molds after decobalting is completed, so that the molds can be used only once, a large amount of waste of materials is caused, and the production efficiency is influenced.
SUMMERY OF THE UTILITY MODEL
Aiming at the situation, in order to overcome the defects of the prior art, the utility model aims to provide a cobalt removing device for a polycrystalline diamond compact, which effectively solves the problems of poor cobalt removing effect, serious material waste, low production efficiency and the like.
The technical scheme of its solution is, including the container, contain the cobalt reagent of taking off in the container, it has the mould to soak in the cobalt reagent, and the lower surface equipartition of mould is equipped with a plurality of spacing holes, installs the polycrystalline diamond compact piece in the spacing hole, and the polycrystalline diamond compact piece includes diamond layer and alloy-layer, and the alloy-layer is located the inside in spacing hole, and the upper surface of mould is equipped with the communicating air vent with spacing hole, and the air vent upper end has connected gradually first trachea and second trachea, and the second trachea switches on air compressor and vacuum pump respectively.
The cobalt removing device has the advantages of ingenious structure, simplicity in operation and good cobalt removing effect, ensures the product quality, improves the working efficiency, can recycle the die for many times, and reduces the production cost.
Drawings
Fig. 1 is a schematic view of the front view of the present invention.
Fig. 2 is a schematic view of a three-dimensional structure of a mold and a vent hole in the present invention.
Fig. 3 is a schematic view of a mold and polycrystalline diamond compact of the present invention mated together.
Fig. 4 is a schematic view of a polycrystalline diamond compact according to the present invention.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
By figure 1 to figure 4 and give, a device that polycrystalline diamond compact takes off cobalt, including container 1, contain in the container 1 and take off cobalt reagent 2, it has mould 3 to take off to soak in the cobalt reagent 2, the lower surface equipartition of mould 3 is equipped with a plurality of spacing holes, install polycrystalline diamond compact 4 in the spacing hole, polycrystalline diamond compact 4 includes diamond layer 5 and alloy-layer 6, alloy-layer 6 is located the inside in spacing hole, the upper surface of mould 3 is equipped with and spacing communicating air vent 7 in hole, air vent 7 upper end has connected gradually first trachea 8 and second trachea 9, second trachea 9 switches on air compressor 10 and vacuum pump 11 respectively.
In order to avoid corrosion of the device, the container 1 and the second air pipe 9 are made of polypropylene.
The cobalt removal reagent 2 is one or a mixture of several of nitric acid, hydrochloric acid, hydrofluoric acid and perchloric acid.
In order to improve the corrosion resistance, the die 3 and the first air pipe 8 are made of polytetrafluoroethylene materials.
The polycrystalline diamond compact 4 has a diameter of 16cm and a height of 13 cm.
The polycrystalline diamond compact 4 has a diameter of 19cm and a height of 8 cm.
Example one
When the utility model is used, the terms of directions or position relations such as front, back, left, right, upper and lower are based on a front view, the polycrystalline diamond compact 4 is formed by compressing diamond micro powder, a bonding agent and hard alloy at high temperature and high pressure, the polycrystalline diamond compact 4 comprises a diamond layer 5 and an alloy layer 6, the size of the polycrystalline diamond compact 4 is 16cm in diameter and 13cm in height, a corrosion-resistant resin solution is firstly coated in a limiting hole, then the alloy layer 6 of the polycrystalline diamond compact 4 is pressed into the limiting hole, when the polycrystalline diamond compact 4 and the limiting hole are completely matched, the alloy layer 6 is completely positioned in the limiting hole, the diamond layer 5 is completely exposed outside, a vacuum pump 11 is started, negative pressure is formed in a first air pipe 8 and a second air pipe 9, and the limiting hole is evacuated through an air vent 7, guaranteed polycrystalline diamond compact 4 in spacing downthehole leakproofness, effectively prevented polycrystalline diamond compact 4's alloy-layer 6 from suffering the corruption, then place mould 3 in taking off cobalt reagent 2 in container 1, through 72 h's soaking, let in the air to spacing downthehole through air compressor 10, under the effect of atmospheric pressure, can break away from spacing hole with polycrystalline diamond compact 4 fast, the decobalting degree of depth of inspection diamond layer 5 at last is 350 um.
Example two
The polycrystalline diamond compact 4 is formed by compressing diamond micro powder, a binding agent and hard alloy at high temperature and high pressure, the polycrystalline diamond compact 4 comprises a diamond layer 5 and an alloy layer 6, the size of the polycrystalline diamond compact 4 is 19cm in diameter and 8cm in height, firstly, a corrosion-resistant resin solution is coated in a limiting hole, then, the alloy layer 6 of the polycrystalline diamond compact 4 is pressed into the limiting hole, when the polycrystalline diamond compact 4 and the limiting hole are completely matched, the alloy layer 6 is completely positioned in the limiting hole, the diamond layer 5 is completely exposed outside, a vacuum pump 11 is started, negative pressure is formed in a first air pipe 8 and a second air pipe 9, the limiting hole is evacuated through an air vent 7, the sealing performance of the polycrystalline diamond compact 4 in the limiting hole is ensured, the alloy layer 6 of the polycrystalline diamond compact 4 is effectively prevented from being corroded, and then, a mould 3 is placed in a cobalt removal reagent 2 in a container 1, soaking in-process auxiliary heating device, heating temperature is 60 ℃, through 50 h's soaking, lets in the air to spacing downthehole through air compressor 10, under the effect of atmospheric pressure, can break away from spacing hole polycrystalline diamond compact 4 fast, and the decobalting degree of depth of final inspection diamond layer 5 is 430 um.
Compared with the traditional equipment, the utility model has the following advantages: 1) the sealing performance is good, the alloy layer 6 of the polycrystalline diamond composite sheet 4 is completely protected, the quality of the polycrystalline diamond composite sheet 4 is guaranteed, and meanwhile, the diamond layer 5 and the cobalt removal reagent 2 can be completely soaked, so that the cobalt removal effect is improved; 2) adopt the atmospheric pressure principle, can cooperate polycrystalline diamond compact 4 and spacing hole completely, can easily take out polycrystalline diamond compact 4 again, avoid polycrystalline diamond compact 4 to take place to collide with to improve mould 3's utilization ratio, can reuse, reduce cost.
The cobalt removing device has the advantages of ingenious structure, simplicity in operation, good cobalt removing effect, guarantee of product quality, improvement of working efficiency and good market prospect.
Claims (5)
1. The utility model provides a device that polycrystalline diamond compact takes off cobalt, a serial communication port, including container (1), contain in container (1) and take off cobalt reagent (2), it has mould (3) to take off soaking in cobalt reagent (2), the lower surface equipartition of mould (3) is equipped with a plurality of spacing holes, spacing downthehole polycrystalline diamond compact (4) of installing, polycrystalline diamond compact (4) include diamond layer (5) and alloy-layer (6), alloy-layer (6) are located the inside in spacing hole, the upper surface of mould (3) is equipped with and spacing communicating air vent (7) in hole, air vent (7) upper end has connected gradually first trachea (8) and second trachea (9), second trachea (9) switch-on air compressor (10) and vacuum pump (11) respectively.
2. A device for decobalting a polycrystalline diamond compact according to claim 1, wherein the vessel (1) and the second gas tube (9) are made of polypropylene.
3. A device for decobalting a polycrystalline diamond compact according to claim 1, wherein the die (3) and the first gas tube (8) are both made of teflon.
4. A polycrystalline diamond compact decobalting apparatus as claimed in claim 1, in which the polycrystalline diamond compact (4) has dimensions of 16cm in diameter and 13cm in height.
5. The apparatus of claim 1, wherein the polycrystalline diamond compact (4) has dimensions of 19cm in diameter and 8cm in height.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120703837.8U CN215713386U (en) | 2021-04-07 | 2021-04-07 | Device for removing cobalt from polycrystalline diamond compact |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120703837.8U CN215713386U (en) | 2021-04-07 | 2021-04-07 | Device for removing cobalt from polycrystalline diamond compact |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215713386U true CN215713386U (en) | 2022-02-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120703837.8U Active CN215713386U (en) | 2021-04-07 | 2021-04-07 | Device for removing cobalt from polycrystalline diamond compact |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215713386U (en) |
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2021
- 2021-04-07 CN CN202120703837.8U patent/CN215713386U/en active Active
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