Preparation method of continuous high quality soldering powder

A high-quality, soldering technology, applied in the field of alloy preparation, can solve problems affecting product quality and increasing production costs, and achieve the effects of environmental protection, quality improvement, and production labor cost reduction

Active Publication Date: 2009-02-11
HUIJIN ATOMIZING SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the sorting is carried out in an inert gas, another protective gas is required, which increases the production cost; if the sorting is carried out in the atmosphere, the oxygen content of the finished tin powder is very high, which will generally double to triple, seriously affecting the product quality

Method used

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  • Preparation method of continuous high quality soldering powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The production process of tin alloy powder is as follows:

[0031]First, use the vacuum system 15 to evacuate the atomization chamber 4, and then fill the atomization chamber 4 with protective gas from the gas source 10 until the indoor pressure is slightly higher than 1 atmospheric pressure; , inert gas 10, hydrogen gas 14, etc. are adjusted to the required concentration; the tin alloy material is melted with the alloy melting furnace 1, and the liquid is transported to the atomizer 3 through the infusion tube 2, and the atomizer 3 can be a centrifugal atomizer, Ultrasonic atomizer, electric pulse atomizer and gas atomizer, the atomizer 3 atomizes the tin alloy metal liquid into tiny droplets; the atomized droplets solidify into solid metal when flying in the atomization chamber 4 The solidification of powder and liquid droplets is controlled by factors such as the temperature and atmosphere in the atomization chamber 4; then the metal powder is transported to the mult...

Embodiment 2

[0038] Production of Sn63Pb37 Alloy Powder

[0039] Will figure 1 After the equipment in the vacuum is evacuated, at 25m 3 Fill the atomization chamber 4 with nitrogen at an inflation rate of / h, adjust the oxygen atmosphere in the atomization chamber 4 to 200ppm with the oxygen supply / oxygen meter 9, the temperature of the Sn63Pb37 alloy in the alloy melting furnace 1 is 250°C, and the liquid metal A rotary ultrasonic atomizer 3 with a frequency of 45KHz is introduced into the atomization chamber 4 at a speed of 100kg / h. The temperature in the atomization area is controlled at 60~80°C, and the temperature in the atomization chamber outside the atomization area is controlled to 40 below ℃. A 325-mesh and a 500-mesh screen are installed on the sieving machine 5, and after being sieved by the sieving machine 5 under the atomization chamber 4, the product flow rate of Type3# powder (-325~+500 mesh) with a standard particle size reaches 62kg / h. Other powders out of specificatio...

Embodiment 3

[0041] Production of Sn99Ag0.3Cu0.7 Alloy Powder

[0042] Will figure 1 After vacuumizing the equipment in the method, fill the atomization chamber 4 with nitrogen at an inflation rate of 30m3 / h, and adjust the oxygen atmosphere in the atomization chamber 4 to 800ppm with the oxygen supply / oxygen meter 9, wherein the atomization area The oxygen atmosphere concentration is adjusted to 80ppm, the temperature of the Sn99Ag0.3Cu0.7 alloy in the alloy melting furnace 1 is 290°C, and the liquid metal is introduced into the centrifugal atomizer 3 in the atomization chamber 4 at a speed of 120kg / h. The speed of 3 is 60000rpm, the temperature in the atomization area is controlled below 40°C, and the temperature in the atomization room outside the atomization area is the free temperature. A 400-mesh and a 625-mesh screen are installed on the sieving machine 5, and after being sieved by the sieving machine 5 under the atomization chamber 4, the product flow rate of Type4# powder (-400~+...

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Abstract

The invention discloses a method for preparing alloy powder, more particularly relates to a method for continuously preparing high-quality tin alloy welding powder. The invention is characterized in that an atomizing chamber is vacuumed, then inert protection gas is filled into the atomizing chamber; the tin alloy material is melted in a melting furnace, and then is controlled to be atomized in the atomizing chamber; after being cooled, the tin alloy material is solidified into tin alloy powder grain; by the sieving of the equipment, the needed product is obtained; products not meeting the requirements is melted and prepared again. The invention has the advantage that the quality of tin alloy powder is greatly improved by optimizing producing condition; the surface chemical property is improved; the productive labor cost can be greatly lowered; high priority is given to environmental protection in the process of realizing a circular production process. Products prepared by the method can be widely applied to encapsulation and circuit board welding material in electronic industry.

Description

technical field [0001] The invention relates to a method for preparing an alloy, in particular to a method for continuously preparing high-quality solder powder alloy. Background technique [0002] Tin alloy powdered solder is widely used in surface mount (SMT) in the electronics industry. The production of tin alloy powdered solder for solder paste began in the 1980s. Initially, the gas atomization method was used for batch production, and later centrifugal and ultrasonic methods were used for batch production. The application of tin alloy powder in surface mounting generally requires a very low oxygen content. For example, the total oxygen content allowed in the product is 50-120ppm. Too high oxygen content cannot be applied to SMT solder paste. Therefore, the production equipment of tin powder generally uses very pure inert gas, the production equipment has a good vacuum, and the production equipment is generally an intermittent production equipment using powder collecti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/08
Inventor 陈新国
Owner HUIJIN ATOMIZING SCI
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