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Multi-element alloy brazing filler metal for vacuum sealing

A multi-element alloy and alloy solder technology, which is applied in welding/cutting medium/material, welding equipment, welding medium, etc., can solve the problems of difficulty in meeting the requirements of lower melting point solder, increased alloy brittleness, poor processing performance, etc. Achieve the effect of eliminating residual stress, optimizing lattice arrangement, and improving processing performance

Inactive Publication Date: 2019-08-16
WUXI RIYUE ALLOY MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The melting point of the traditionally used AgCuIn alloy solder is between 630 and 730 °C, which is difficult to meet the requirements for the use of lower melting point solder
With the increase of In content, the melting point of the alloy can be obviously reduced to 550-580°C, but at the same time, the brittle phase in the alloy increases, cracks appear on the surface of the strip during the rolling process, and the processability is poor.

Method used

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  • Multi-element alloy brazing filler metal for vacuum sealing
  • Multi-element alloy brazing filler metal for vacuum sealing

Examples

Experimental program
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Effect test

Embodiment 1

[0022] A multi-element alloy brazing filler metal for vacuum sealing, the composition of each metal element is shown in Table 1, and the preparation method thereof comprises the following steps:

[0023] (1) Put the raw materials Ag, Cu, In, Ge, Ga, Y, Ce into the vacuum melting furnace according to the proportion. After the vacuum degree in the furnace is pumped to 0.02Pa, the furnace is heated to 1500 ° C and filled with nitrogen protective gas. , keep the temperature for 40min, and then reduce the temperature to 900℃, cast the alloy liquid into the graphite crucible shaping mold;

[0024] (2) vacuum annealing the cast ingot, the annealing temperature is 500 ℃, the temperature is kept for 1.5h, and the ingot is naturally cooled to room temperature to take out the ingot;

[0025] (3) The ingot after the annealing treatment in step (2) is subjected to pickling treatment, and the pickling solution is a mixed solution of 10% sulfuric acid and 12% chromic anhydride.

[0026] (4)...

Embodiment 2

[0031] A multi-element alloy brazing filler metal for vacuum sealing, the composition of each metal element is shown in Table 1, and the preparation method thereof comprises the following steps:

[0032] (1) Put the raw materials Ag, Cu, In, Ge, Ga, Y, Ce into the vacuum melting furnace according to the proportion. After the vacuum degree in the furnace is pumped to 0.1Pa, the furnace is heated to 1550 ° C and filled with nitrogen protective gas , keep the temperature for 35min, and then reduce the temperature to 950℃, cast the alloy liquid into the graphite crucible mold;

[0033] (2) vacuum annealing the cast ingot, the annealing temperature is 520 ℃, keep for 1h, and naturally cool to room temperature to take out the ingot;

[0034] (3) The ingot after the annealing treatment in step (2) is subjected to pickling treatment, and the pickling solution is a mixed solution of 12% sulfuric acid and 13% chromic anhydride.

[0035] (4) hot-rolling the ingot processed in step (3), ...

Embodiment 3

[0040] A multi-element alloy brazing filler metal for vacuum sealing, the composition of each metal element is shown in Table 1, and the preparation method thereof comprises the following steps:

[0041] (1) Put the raw materials Ag, Cu, In, Ge, Ga, Y, Ce into the vacuum melting furnace according to the proportion. After the vacuum degree in the furnace is pumped to 0.4Pa, the furnace is heated to 1600 ° C and filled with nitrogen protective gas. , keep the temperature for 30min, and then reduce the temperature to 1000℃, cast the alloy liquid into the graphite crucible mold;

[0042] (2) vacuum annealing the cast ingot, the annealing temperature is 550°C, the temperature is kept for 0.5h, and the ingot is naturally cooled to room temperature to take out the ingot;

[0043] (3) The ingot after the annealing treatment in step (2) is subjected to pickling treatment, and the pickling solution is a mixed solution of 13% sulfuric acid and 14% chromic anhydride.

[0044] (4) hot-rol...

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Abstract

The invention discloses a multi-element alloy brazing filler metal for vacuum sealing. The multi-element alloy brazing filler metal comprises the following metal elements of, in percentage by mass, 50%-63.5% of Ag, 24%-28% of Cu, 9%-14% of In, 2%-5% of Ge, 1%-2% of Ga, 0.3%-0.5% of Y, and 2%-0.5% of Ce; and the preparation method of the multi-element alloy brazing filler metal comprises the following steps of smelting, hot rolling blooming, solution treating, cold rolling, annealing and finish machining. The brazing filler metal prepared by the preparation method is low in melting point, highin cleanliness, high in tensile strength and good in oxidation resistance.

Description

technical field [0001] The invention relates to a sealing brazing filler metal for vacuum electronic tubes in the vacuum electronics industry, in particular to a multi-element alloy brazing filler metal. Background technique [0002] In the field of electrical vacuum sealing, silver-based alloy solders are widely used because of their excellent sealing properties. AgCu28 and AgCuNi28-1 solders are represented as representatives. The melting point of silver-based alloy solders is roughly between 800 and 830 °C. During this time, it is difficult to meet the requirements for low melting point solder in multi-level sealing. The melting point of metal In is 157 °C, and the melting point of metal Ga is 29.8 °C. By adding these two metals appropriately, the melting point of the alloy can be effectively reduced. At the same time, the In brazing filler metal has good wetting to copper, nickel, stainless steel and Kovar alloy. , has good welding performance. The melting point of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C5/08C22C1/02C22F1/02C22F1/14B23K35/30
CPCB23K35/3006C22C1/02C22C5/08C22F1/02C22F1/14
Inventor 晏弘
Owner WUXI RIYUE ALLOY MATERIALS
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