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Continuous chemical powder plating method and apparatus

An electroless plating and powder technology, which is applied in liquid electroless plating, coating, metal material coating process, etc., can solve the problems such as the inability to fundamentally solve the uniformity of metal coating and the inability to realize continuous production, so as to reduce labor strength, improve consistency, achieve continuous effects

Inactive Publication Date: 2003-09-10
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

From this method, the uniformity of metal coating in mass production cannot be fundamentally solved, and continuous production cannot be realized.

Method used

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  • Continuous chemical powder plating method and apparatus
  • Continuous chemical powder plating method and apparatus
  • Continuous chemical powder plating method and apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] 1) The pipe diameter is 20 mm, the flow rate is 7.2 liters / hour, and the length of the ultrasonic inner coil is 12 meters. The time for the solution to be irradiated by ultrasonic waves is 90 minutes, and the amount of raw material powder per hour is 648 grams.

[0046] 2) Metering pump power, specification: 600W, 10 liters / hour

[0047] 3) Ultrasonic power and frequency: 300W, 20~40KHz

[0048] 4) Composite powder: 720 g / h (metal content is 10% by weight)

[0049]5) Solution composition: nano-alumina powder with a size of 10-20nm. Add the sensitized and activated powder into the main salt solution containing 35 g / L of cobalt sulfate, 15 g / L of sodium citrate, and 40 g / L of boric acid, and stir to form a suspension L 1 ; another solution L 2 It is composed of sodium hypophosphite 20 g / L and a certain amount of NaOH, and the pH value of the mixture is 10.5. The obtained composite powder is observed by a transmission electron microscope, and is uniformly composited co...

Embodiment 2

[0051] 1) The diameter of the pipe is 20 mm, the flow rate is 35 liters / hour, the length of the ultrasonic inner coil is 60 meters, the time of the solution under ultrasonic irradiation is 90 minutes, and the amount of raw material powder per hour is 3240 grams.

[0052] 2) Metering pump power, specification: 3000W, 50 liters / hour

[0053] 3) Ultrasonic power and frequency: 1500W, 20~40KHz

[0054] 4) Composite powder: 6480 g / h (metal content is 50% by weight)

[0055] 5) Solution composition: micron titanium oxide powder with a size of 0.8-1.2 μm. The sensitized and activated powder is added to the reducing solution L containing sodium hypophosphite 15 g / L and a certain amount of H2SO4 1 In, stirring to form a suspension; another solution is the main salt solution L of nickel sulfate 30 g / L, sodium citrate 17 g / L, and sodium acetate 15 g / L 2 , the pH value of the mixture is 4.5. Results Observation by scanning electron microscope showed that nickel was evenly coated on th...

Embodiment 3

[0057] 1) The pipe diameter is 20 mm, the flow rate is 7.2 liters / hour, the ultrasonic inner coil is 12 meters long, the solution is irradiated by ultrasonic waves for 30 minutes, and the amount of raw material powder per hour is 648 grams.

[0058] 2) Metering pump power, specification: 600W, 10 liters / hour

[0059] 3) Ultrasonic power and frequency: 300W, 20~40KHz

[0060] 4) Composite powder: 1296 g / h (metal content is 50% by weight)

[0061] 5) Solution composition: micron tin oxide powder with a size of 1-5 μm. The sensitized and activated powder is added with reducing solution L containing 6 g / L of formaldehyde and 2.2 mL / L of methanol 1 In, stirred to form a suspension; another solution L 2 It is composed of 17.5 g / L silver nitrate, 35 g / L ammonia water and 2 g / L sodium hydroxide. The obtained composite powder is observed by a scanning electron microscope, and it is a powder in which Ag is uniformly compounded on the surface of the tin oxide powder.

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Abstract

The present invention discloses a continuous chemical powder-plating method and apparatus. The apparatus incldues the first container with suspension comprising powder and solution L1, mechanical stirrer or ultrasonic generator inside the first container, the second container with solution L2, with the solution L1 and solution L2 being main salt and reducing liquid separately or plating liquid and pH regulating liquid separately. The first container and the second container are connected to a mixing chamber via pipe with separate metering pump, the mixing chamber is connected via pipe to coil pipe in the ultrasonic generator, and the coil pipe is also connected to one third container. After the solution L1 and the solution L2 are mixed in certain ratio, the mixed solution is set in the coil pipe for chemical plating reaction.

Description

technical field [0001] The invention relates to a continuous powder electroless plating method and a device thereof. Background technique [0002] Electroless plating is a chemical treatment method that uses a suitable reducing agent to selectively reduce and precipitate metal ions in the solution on the catalytically active surface to form a metal coating. Electroless plating on the surface of the powder can obtain composite powders such as metal-coated ceramics, polymers, and metals, which are widely used in the fields of conductive paste, electrical contact materials, stealth materials, ceramic knives, and thermal spray powders. [0003] The uniformity of metal coating is a key problem in powder electroless plating. The method of low-temperature ultrasonic electroless plating is adopted to better solve the problem of coating uniformity of powder, especially ultra-fine powder electroless plating (patent application number 01116714.9). However, t...

Claims

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Application Information

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IPC IPC(8): B22F1/02C04B35/628C23C18/16C23C18/34
Inventor 凌国平王尚军
Owner ZHEJIANG UNIV
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