Process method for preparing silver solder

A technology of silver brazing filler metal and silver powder is applied in the field of preparing silver brazing filler metal, which can solve the problems of affecting the mechanical properties and welding performance of silver-based brazing filler metals, difficult to control alloy composition, affecting production continuity, etc. The effect of short time and concise craftsmanship

Active Publication Date: 2015-06-17
昆明铂生金属材料加工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, no matter what kind of smelting process is used in actual production, the loss of alloying elements is relatively large during the smelting process, especially active metal elements (such as: zinc, lithium, magnesium, etc. ) is easy to oxidize, and the alloy composition is difficult to control. At the same time, because metallic silver is easy to get gas in the molten state, it is reported in the literature that in the molten state, silver can dissolve oxygen that exceeds 21 times its own volume. This property of silver brings smelting and casting. here comes the problem
It makes the alloy easy to volatilize at high temperature or cause a lot of loss due to splashing during cooling from high temperature
And in the subsequent ingot casting and cooling process, it will cause internal defects in the ingot, or directly affect the subsequent mechanical properties and welding properties of silver-based solder
Although deoxidizers or vacuum smelting are currently used, either other impurity elements are introduced, or vacuum equipment is added, which affects the continuity of production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0012] The steps of the method for preparing silver solder of the present invention include: placing silver powder and other pure metal element powders or intermediate alloy powders in a ball mill tank lined with polytetrafluoroethylene for ball milling according to a selected formula, and ball milling Put the mixed powder into the graphite crucible of the SPS system, vacuumize to 2-10Pa, and use 5-50 o C / min heating up to 900~1100 o C. The pressure is 5MPa ~ 40MPa, the pressure holding time is 10 minutes ~ 60 minutes, then the temperature is lowered and the material is taken out of the furnace, the sintered ingot is precision swaged, and then drawn into wire or rolled into sheet.

[0013] The purity of the silver powder is ≥99%, and the particle size ranges from 100 mesh to 500 mesh.

[0014] The pure metal element powder is one of copper, nickel, zinc, tin and palladium, with a purity ≥ 99% and a particle size range of 100 mesh to 500 mesh.

[0015] The master alloy powder...

Embodiment 1

[0022] Example 1 72 grams of silver powder with a purity of 99.5% and a particle size range of 100 mesh, and 28 grams of copper powder with a purity of 99% and a particle size range of 100 mesh were placed in a ball mill tank lined with polytetrafluoroethylene, and the ball-to-material ratio was 1 : 3, speed 100rpm / min, uniform mixing for 1 hour. Put the powder mixed by the ball mill into the graphite crucible of the SPS system. The size of the graphite crucible is ×10. o C / min heating up to 900 o C, the pressure is 5MPa, the holding time is 15 minutes, and then the temperature is lowered and the material is taken out of the furnace. The sintered ingot is precision swaged to Φ6, and then drawn to wire Φ1±0.05.

Embodiment 2

[0023] Embodiment 2 is that purity is 99.5%, and particle size range is 80 grams of silver powders of 200 mesh, and purity is 99%, and particle size range is 200 mesh copper-nickel master alloy powder Cu 0.9 Ni 0.1 20 grams, placed in a ball mill jar lined with polytetrafluoroethylene, the ratio of balls to materials is 1:5, the speed is 200rpm / min, and the mixture is uniformly mixed for 2 hours. Put the powder mixed by the ball mill into the graphite crucible of the SPS system. The size of the graphite crucible is Φ20×10. o C / min heating up to 1100 o C, the pressure is 20MPa, the holding time is 20 minutes, then the temperature is lowered and the material is taken out of the furnace. The sintered ingot is precision swaged to Φ6, and then rolled into a sheet of 6×0.5±0.01.

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Abstract

The invention relates to a method for preparing silver solder. The method comprises the following specific steps: applying pressure to raw material particles arranged in a graphite crucible by upper and lower graphite press heads in a spark plasma sintering system (SPS) under the vacuum condition; directly heating the raw material particles by using pulse current; and breaking through an oxidation film of each particle of metal powder at instant high temperature and enabling the oxidation film to be subjected to surface activation and quick liquefaction. The reaction speed of particles and the reaction speed among the particles are increased, the diffusion speed of alloy element atoms is increased and the aims of quickly alloying and densifying a sintering body are achieved. Compared with a traditional smelting method, the method disclosed by the invention has the advantages of simple and easily-controlled process, no loss of alloy elements, accurate components of silver-based solder components, low oxygen content, short sintering time, low energy consumption, safety, no pollution and favorable reproducibility. The ingot products prepared by the method are high in density; crystal particles are fine and are uniform in size; and the method is an economic and efficient green preparation process.

Description

technical field [0001] The invention relates to a method for preparing silver brazing material, which is different from the preparation method of the traditional process. The silver-based brazing material recommended in GB / T 10046-2008 "Silver Brazing Material" is used as the manufacturing and processing object, which belongs to the processing and preparation of brazing materials technology field. Background technique [0002] Silver brazing filler metal is currently the most widely used brazing filler metal, which has excellent process performance, suitable melting point, good wetting and gap filling ability. And the solder and fiber seam have high strength, good plasticity, excellent electrical conductivity and corrosion resistance, so they are widely used in brazing all ferrous and non-ferrous metals except aluminum, magnesium and other low-melting point metals, such as: low carbon steel, stainless steel , superalloys, copper and copper alloys, Kovar alloys and refractor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/40
Inventor 王玉天张维钧胡劲文劲松
Owner 昆明铂生金属材料加工有限公司
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