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Low-silver-content silver brazing filler metal for sealing and connecting of ceramic and metal

A silver solder and metal technology, applied in metal processing equipment, welding/cutting media/materials, welding media, etc., can solve the problems of low strength of sealed joints and high strength of sealed joints, achieve low vapor pressure, ensure plasticity and High machinability and strength

Inactive Publication Date: 2018-03-27
WUXI RIYUE ALLOY MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When using the disclosed solder alloy of the patent CN104411450A to seal pottery and metal, the nickel-plated layer is corroded and disappears (as figure 2 ), so the strength of the sealing joint is low; and when the Ag72Cu28 solder is used for sealing, no damage to the nickel plating layer is found, so the strength of the sealing joint is high

Method used

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  • Low-silver-content silver brazing filler metal for sealing and connecting of ceramic and metal
  • Low-silver-content silver brazing filler metal for sealing and connecting of ceramic and metal
  • Low-silver-content silver brazing filler metal for sealing and connecting of ceramic and metal

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Embodiment Construction

[0020] Below in conjunction with embodiment, the present invention is described in detail. Each embodiment is prepared according to the following preparation methods:

[0021] (1) The Ag, Cu, and Ga metals with a purity of 99.9% are proportioned according to the composition ratio of each element. Table 1 provides an example of the composition ratio.

[0022] (2) Put it into a vacuum induction melting furnace, and the vacuum degree in the furnace reaches 4×10 -1 ~4×10 -2 Start heating after Pa, raise the furnace temperature to 1100-1200°C, and keep the temperature for 20-40 minutes.

[0023] (3) After the alloy is completely melted, hydrogen gas is filled, the temperature is lowered to about 950° C., and then the molten metal is poured into a mold to obtain a solder alloy ingot.

[0024] (4) Peel the ingot to remove oxides, and then perform cold rolling to a thickness of 1 to 2 mm.

[0025] (5) Annealing at a temperature of 650°C, and then cold rolling to a foil material wi...

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Abstract

The invention provides low-silver-content silver brazing filler metal for sealing and connecting of ceramic and metal. The brazing filler metal includes the following metal elements comprising, by weight, 47%-58% of Ag, 39%-43% of Cu and 3%-10% of Ga. Preferably, the weight of the alloy element Cu and the weight of the alloy element Ga need to meet the condition that Cu:Ga is larger than or equalto 4.5. The silver brazing filler metal is low in silver content, and the welding temperature is equivalent to that of Ag72Cu28; the brazing filler metal machinability is good; the brazing filler metal wettability is good, and the strength of a sealing and connecting connector is high; and the low-silver-content silver brazing filler metal can be used for replacing Ag72Cu28 brazing filler metal which is widely used at present, is particularly suitable for sealing and connecting of ceramic and metal in electric vacuum devices and can also be used for vacuum brazing and gas shield brazing in other fields.

Description

technical field [0001] The invention belongs to the field of welding and relates to a silver-based solder with low silver content. It can replace Ag72Cu28 solder widely used at present, especially suitable for sealing ceramics and metals in electric vacuum devices, and can also be used for vacuum brazing and gas shielded brazing in other fields. Background technique [0002] Ag72Cu28 solder is a kind of solder that is widely used in the electric vacuum industry. The reasons are: (1) the brazing temperature of the solder is moderate (about 800 ° C ~ 850 ° C); (2) the solder is suitable for copper, nickel, etc. The metal has good wettability and fluidity, and has good manufacturability; (3) The solder has good processing performance and is easy to process into various shapes such as sheets, foils, plates, wires, etc.; (4) does not contain volatile elements, Meet the requirements of electric vacuum devices. Therefore, Ag72Cu28 solder is widely used in the welding and sealing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/30
CPCB23K35/3006
Inventor 晏弘
Owner WUXI RIYUE ALLOY MATERIALS
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