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Method for preparing active solder

A technology of active brazing and blanks, applied in welding equipment, welding/cutting medium/material, welding medium, etc., it can solve the complex surface pretreatment process and welding process of workpiece, difficult to control welding quality, and can not meet welding quality requirements and other problems, to achieve the effect of simplifying the original welding process, solving the complex brazing process and wide application surface

Inactive Publication Date: 2002-11-27
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the welding process of existing diamond tools, the brazing of polycrystalline diamond tools, because polycrystalline diamond sheets are sintered by diamond particles and metal, usually adopts common brazing material (such as copper-zinc alloy, copper-silver-zinc alloy, etc.) for brazing; the combination of natural diamond and artificial diamond with metal usually adopts the inlay method, and the diamond surface must be metallized before brazing with ordinary brazing material. This method has workpiece surface pretreatment The process and welding process are complicated, and the welding quality is difficult to control, etc.
If the ordinary brazing material is directly used for brazing bonding between the diamond and the metal, since the surface of the diamond is difficult to be wetted by the ordinary brazing material, there is no chemical reaction between the diamond and the ordinary brazing material, and the bonding between them is only Mechanical bonding, far from meeting welding quality requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] B. Put the three kinds of alloy powders into an ordinary mixer for dry mixing for 2 hours; the evenly mixed powders are pressed into a block-shaped billet on a THP-60A fast hydraulic press under a pressure of 550Mpa.

[0027] C. Put the pressed block blank into an ordinary vacuum induction heating furnace, and vacuumize it to 10 -3 Pa, and filled with Ar gas to 3Pa after vacuuming, and sintered at 700°C for 1.2 hours. The sintered billets were annealed at 650°C for 2 hours.

[0028] D. First take the annealed billet out of the vacuum induction heating furnace, roll it in a hot rolling mill, adjust the rolling temperature to 600°C, go through hot rolling—annealing—hot rolling, and repeat it many times until the billet is reduced. Brazing sheet as thin as 1.5mm thick; after the oxide film on the surface of the hot-rolled brazing sheet is acid-washed, it is rolled into a 0.15mm active brazing sheet on an ordinary cold rolling mill. The melting point is 780°C, and ...

Embodiment 2

[0031] B. Put the three kinds of alloy powders into an ordinary mixer and dry mix them for 3 hours; the powders mixed evenly are pressed into a block billet on a THP-60A fast hydraulic press under a pressure of 500Mpa.

[0032] C. Put the pressed block blank into an ordinary vacuum induction heating furnace, and vacuumize it to 10 -2 Pa, and filled with Ar to 3.5Pa after vacuuming, and sintered at 750°C for 1 hour. The sintered billet was annealed at 650°C for 3 hours.

[0033] D. First take the annealed billet out of the vacuum induction heating furnace, adjust the rolling temperature to 650°C in the hot rolling mill mechanism, and go through hot rolling—annealing—hot rolling repeatedly until the billet is thinned to 1.8mm thick solder sheet; after the hot-rolled solder surface oxide film is acid-washed, it is rolled into a 0.18mm active brazing sheet on a common cold rolling mill. This sheet has a melting point of 800 ° C and has been Successfully applied to the bra...

Embodiment 3

[0036] B. Put the three kinds of alloy powders into an ordinary mixer for dry mixing for 4 hours; the evenly mixed powders are pressed into a block-shaped billet on a THP-60A fast hydraulic press under a pressure of 550Mpa.

[0037] C. Put the pressed block blank into an ordinary vacuum induction heating furnace, and vacuumize it to 10 -3 Pa, and filled with Ar gas to 2.5Pa after vacuuming, and sintered at 1000°C for 0.8 hours. The sintered blank was annealed at 700°C for 5 hours.

[0038] D. First take the annealed billet out of the vacuum induction heating furnace, adjust the rolling temperature to 650°C in the hot rolling mill mechanism, and go through hot rolling—annealing—hot rolling repeatedly until the billet is thinned to 1.2mm thick solder sheet; after the hot-rolled solder surface oxide film is acid-washed, it is rolled into a 0.12mm active brazing sheet on an ordinary cold rolling mill. The melting point of this sheet is 830°C, which has been successfully a...

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Abstract

The Ag-Cu-Ti active solder is prepared with alloy powder containing Ag in 49-69 wt%, Cu in 30-50 wt% and Ti in 1-8 wt% and through a powder metallurgical process including mixing material, pressing, vacuum sintering, annealing, hot rolling and cold rolling. It has a melting point of 780-830 deg.c and purity over 99%. It has wide application range, can be used in braze welding between diamond and metal, ZrO2 ceramic and alloy steel, and results in high welding quality and simplified welding process.

Description

technical field [0001] The invention relates to a brazing material, in particular to a preparation method of the brazing material used for welding diamond, ceramics and metals (cutters). Background technique [0002] In the welding process of existing diamond tools, the brazing of polycrystalline diamond tools, because polycrystalline diamond sheets are sintered by diamond particles and metal, usually adopts common brazing material (such as copper-zinc alloy, copper-silver-zinc alloy, etc.) for brazing; the combination of natural diamond and artificial diamond with metal usually adopts the inlay method, and the diamond surface must be metallized before brazing with ordinary brazing material. This method has workpiece surface pretreatment The process and welding process are complicated, and the welding quality is difficult to control. If the ordinary brazing material is directly used for brazing bonding between the diamond and the metal, since the surface of the diamond is d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/28B23K35/40C22C5/08
Inventor 李元元严志军代明江刘正义
Owner SOUTH CHINA UNIV OF TECH
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