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Production method of low melting point spherical metal powder

A low-melting-point metal and production method technology, applied in the field of manufacturing metal powder or its suspension, can solve the problems of high oxygen content of metal micropowder, complex devices and methods, and high noise, and achieve low oxygen content, low noise, and low consumption. The effect of less energy

Active Publication Date: 2011-03-16
SHENZHEN FITECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the main problem that this method exists is: high-temperature metal and thermal oil emulsion are easily oxidized in the process of circulating flow in the shear pump and the non-airtight container, so that the oxygen content of the metal micropowder is too high; The structure is complicated, the manufacturing precision and wear in use make the uniformity of the particle size produced by the device unable to guarantee; the device and method are too complicated, and the mixture of solder and thermal oil is dispersed by mechanical shearing, which leads to high energy consumption and equipment failure High efficiency and high noise are not conducive to civilized production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Preferred embodiment 1. a kind of production method of spherical low melting point metal powder, comprises the steps:

[0025] A. Take 2kg of Sn63Pb37 tin-lead alloy, place it in an airtight container, heat it to 210°C, add 200kg of castor oil and 202g of paraffin at the same or similar temperature;

[0026] B. For the above mixed solution at 4kg / cm 2 The pressure of the nitrogen gas is introduced, and the mixed solution is impacted and dispersed for 30 minutes;

[0027] C. Use 20kHz ultrasonic waves to vertically impact and disperse the mixture for 20 minutes;

[0028] D. Use 20-35kHz ultrasonic waves to impact and disperse the above mixed liquid for 20 minutes;

[0029] E. above-mentioned mixed solution is cooled to below the solid phase temperature of Sn63Pb37 tin-lead alloy;

[0030] F. Filter the castor oil from the above mixture with a strainer to separate the Sn63Pb37 tin-lead alloy powder from the castor oil.

[0031] 19.6 kg of Sn63Pb37 metal powder with a ...

Embodiment 2

[0032] Preferred embodiment 2. a kind of production method of spherical low melting point metal powder, comprises the steps:

[0033] A. Take 2kg of Sn63Pb37 tin-lead alloy, place it in a closed container, heat it to 210°C, add 20kg of castor oil and 1kg of paraffin at the same or similar temperature;

[0034] B. For the above mixed solution at 4kg / cm 2 Nitrogen gas was introduced under pressure, and the mixed solution was impact-dispersed for 40 minutes;

[0035] C. Use 20kHz ultrasonic waves to vertically impact and disperse the mixture for 30 minutes;

[0036] D. Use 20-35kHz ultrasonic waves to impact and disperse the above mixed solution for 30 minutes;

[0037] E. above-mentioned mixed solution is cooled to below the solid phase temperature of Sn63Pb37 tin-lead alloy;

[0038] F. Filter the castor oil from the above mixture with a strainer to separate the Sn63Pb37 tin-lead alloy powder from the castor oil. Obtain 1.96 kg of Sn63Pb37 metal powder with a particle size ...

Embodiment 3

[0039] Preferred embodiment 3. a kind of production method of spherical low melting point metal powder, comprises the steps:

[0040] A. Take 9kg of Sn63Pb37 tin-lead alloy, place it in an airtight container, heat it to 230°C, add 30kg of castor oil and 3.9kg of paraffin at the same or similar temperature;

[0041] B. For the above mixed solution at 3kg / cm 2 The pressure of the nitrogen gas is introduced, and the mixed solution is impacted and dispersed for 40 minutes;

[0042]C. Use a 20kHz high-power ultrasonic vibrating rod vertically inserted into the liquid surface 6cm to vertically impact and disperse the above mixed liquid for 40 minutes;

[0043] D. Use a 35kHz high-power ultrasonic vibrating rod inserted vertically into the liquid surface for 30cm, and disperse the above mixed liquid for 50 minutes by lateral impact;

[0044] E. above-mentioned mixed solution is cooled to below the solid phase temperature of Sn63Pb37 tin-lead alloy;

[0045] F. Filter the castor oi...

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Abstract

A production method of low melting point spherical metal powder comprises the following working procedures: melting low melting point metal or alloy, mixing with hot oil, performing primary dispersion under pressure and inert gas, performing high-power ultrasonic dispersion and emulsification, performing filtering separation, etc. The production method of low melting point spherical metal powder is characterized by high production efficiency, narrow particle size distribution of the product, low oxygen content and no screening procedure. The method is suitable for the productions of the low melting point metal and alloy powder thereof of which liquid-phase temperatures are less than 300 DEG C, such as Pb-based alloy, Sn-based alloy, Sn-Zn based alloy or non-ferrous metals such as Bi, In and the like.

Description

【Technical field】 [0001] The invention relates to the production of metal powder or its suspension, in particular to a production method of low-melting-point metal and its alloy spherical powder at a liquidus temperature below 300°C. 【Background technique】 [0002] Surface mount technology (SMT) is an electronic assembly technology that mounts various electronic components on printed circuit boards or substrates. It is the development of electronic products to high integration, high reliability, high precision and low cost. key. The solder paste with spherical low melting point metal powder as the main component is the key material of SMT. For precision electrical appliances such as mobile phones, MP3, and notebook computers, due to the development of the component pin spacing on electronic circuits to less than 0.2mm, solder paste is required. The spherical tin alloy powder has reached the standards of lead-free, miniaturization, low oxygen content and narrow particle size...

Claims

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Application Information

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IPC IPC(8): B22F9/06
Inventor 徐朴
Owner SHENZHEN FITECH
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