CN1616186A - Processing method for polycrystal diamond composite sheet before welding - Google Patents
Processing method for polycrystal diamond composite sheet before welding Download PDFInfo
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- CN1616186A CN1616186A CN 200310107020 CN200310107020A CN1616186A CN 1616186 A CN1616186 A CN 1616186A CN 200310107020 CN200310107020 CN 200310107020 CN 200310107020 A CN200310107020 A CN 200310107020A CN 1616186 A CN1616186 A CN 1616186A
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- sheet
- pdc
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- before welding
- diamond composite
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Abstract
The processing method of polycrystal diamond composite (PDC) sheet before welding includes throwing PDC sheet or hard alloy into molten salt composition containing Ni, Co and Pd ions for atom replacement and diffusion to form Ni-Co-Pd alloy layer on the surface of the PDC sheet or hard alloy; and subsequent silver brazing. The processed PDC sheet has the brazing seam with stable shearing strength of 230-270 MPa and 320 MPa maximum.
Description
Technical field
The present invention relates to a kind of composite polycrystal-diamond pre-welding treatment method of (poLycrys, taline Dlamond compact are called for short the PDC sheet), be applicable to be in the welding procedure of C drill bit and carbide alloy.
Background technology
The pre-welding treatment technology of existing P DC sheet, physical deposition method commonly used and chemical deposition.At PIE sheet or carbide surface coating one deck Cu, Ni, the Ni-Co alloy-layer is seen United States Patent (USP) NO3465, US Patent No ll5459831.03.66, French Patent (FRP) 14897.10.05 65 etc.Its weak point is that coating and PDC sheet or carbide surface adhesion are lower, and welding back brazed seam shearing strength has only 1270-232MPa.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, generate alloy diffusion layer, improve the shearing strength of brazed seam significantly at PDC sheet or carbide surface.
Purpose of the present invention can reach by following measure: PDC sheet or carbide alloy input are contained in the melting shape fused salt composition of Ni, Co, Pd ion, through atomic substitutions and diffusion process, generate the Ni-Co-Pd alloy-layer at PDC sheet or carbide surface burning infiltration, and then carry out silver brazing.
The present invention compared with prior art, have the following advantages: can fill defectives such as its face crack effectively through the Ni-Co-Pd alloy-layer of atomic substitutions and diffusion generation at PDC sheet or carbide surface, and can prevent that hard metal tip from taking off Co, and wetability with good unanimity, thereby improve the shearing strength of brazed seam, quality when stablizing the soldering of PDC sheet, equipment needed thereby is simple, and method of operating is simple and easy to do.
The specific embodiment
The present invention will now be further detailed embodiment.
Sheet or carbide alloy with cleaning and preheating under 200 degree, dropping into temperature is lower than in the melting shape fused salt composition of 700t, take out after 5 minutes at constant temperature 3/u under the 700t condition, after cooling off naturally, drop in 10% sodium phosphate aqueous solution and boil, take out after polishing, the composition that cleaning can be carried out silver brazing fused salt composition is (calculating by mass) NaOH 40-90%
N1CL
2 5/u?20％
CoCL
2 5Fu?20％
PdCL
2 1-22％
The PDC sheet after the processing and the brazed seam of drill steel body or carcass have stable shearing strength, are generally 230-270Mpa, reach as high as 320Npa.
Claims (1)
1. processing method for polymorphic diamond compound blade before welding, it is characterized in that, PDC sheet or carbide alloy input are contained in the melting shape fused salt composition of Ni, Co, Pd ion, through atomic substitutions and diffusion process, generate the Ni-Co-Pd alloy-layer at PDC sheet or carbide surface burning infiltration, and then carry out silver brazing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310107020 CN1616186A (en) | 2003-11-14 | 2003-11-14 | Processing method for polycrystal diamond composite sheet before welding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310107020 CN1616186A (en) | 2003-11-14 | 2003-11-14 | Processing method for polycrystal diamond composite sheet before welding |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1616186A true CN1616186A (en) | 2005-05-18 |
Family
ID=34757940
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200310107020 Pending CN1616186A (en) | 2003-11-14 | 2003-11-14 | Processing method for polycrystal diamond composite sheet before welding |
Country Status (1)
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| CN (1) | CN1616186A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106270883A (en) * | 2016-08-30 | 2017-01-04 | 郑州机械研究所 | A kind of PDC and the method for attachment of hard alloy |
-
2003
- 2003-11-14 CN CN 200310107020 patent/CN1616186A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106270883A (en) * | 2016-08-30 | 2017-01-04 | 郑州机械研究所 | A kind of PDC and the method for attachment of hard alloy |
| CN106270883B (en) * | 2016-08-30 | 2018-04-20 | 郑州机械研究所有限公司 | A kind of connection method of PDC and hard alloy |
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|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |