US 6,485,674 B2Granted

Device for producing soft solder

OwnerJürgen Schulze, Walter Protschinventors

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Abstract

Soft solder powder is made in the form of spherical fine metal particles having a grain size ranging from 1 to 100 μm and a Liquidus temperature <250° C., using the following method steps: a) gravity feeding the melted solder into another oil receiver while setting a volume ratio of oil to melted solder to at least 10:1; b) dispersing the liquefied solder by agitating and by a subsequent shearing off in consecutive shearing steps according to the rotor/stator principle at rotational speeds ranging from 1500 to 5000 rpm while adding oil from the receiver of step a); c) circulating the solder/oil mixture of step b) at least twenty times in a circuit contrary to the direction of flow above the oil receiver of step a) and in the shearing off steps; d) outward transferring of the solder/oil mixture from the circuit of step c) into another oil receiver for separating off the dispersed material by sedimentation and returning the oil to the receiver of step b) and/or a); and e) extracting and feeding the dispersed material of step d) for a subsequent washing.

Claims19

Dependent claims

An apparatus for the production of soft solder powder in a particle size range of 1 to 100 μm and a liquidus temperature <250° C., comprising:

a support;
a melt container on said support for holding a solder melt;
a dispersion container on said support below said melt container and receiving an oil in which said solder melt is dispersable;
a melt pipe connecting said melt container with said dispersion container and extending downwardly with an inclination to a deepest point of said dispersion container;
a multistage shearing device on said support having an inlet connected to said dispersion container at said deepest point and an outlet, said multistage shearing device subdividing said solder melt into melt droplets dispersable in said oil;
a recirculation pipe connecting said outlet with an upper part of the dispersion container;
a sedimentation container on said support below said dispersion container;
a branch pipe from said recirculation pipe opening into said sedimentation container, said sedimentation container having outlet pipes;
an ascending pipe communicating with the upper part of the sedimentation container and provided with a pump connected to said outlet pipes;
and
at least one heating device for heating said containers, said pipes, said pump and said multistage shearing device.

8 more elements

Dependencies are inferred from the claim text.

Facts

Application: 09/829,821Filed 10 Apr 2001 · division
Priority: DE 198 30 05729 Jun 1998
Published: US 2002/0109273 A115 Aug 2002
Granted: 26 Nov 2002
Term ends: Not estimatedThe source records don’t support an estimate.

Classification12 codes

B22F 9/06
Using physical processes: starting from liquid material
B01J 19/1806
Stationary reactors having moving elements inside: resulting in a turbulent flow of the reactants, such as in centrifugal-type reactors, or having…
B01J 19/1887
Stationary reactors having moving elements inside: forming a thin film
B23K 35/0244
For use in soldering or brazing: powders, particles or spheres; Preforms made therefrom

Family

PCT/DE99/01901Parent of this division · filed 25 Jun 1999
US 2002/0109273 A1Pre-grant publication · published 15 Aug 2002
Application09/485,917Parent of this division
US 6,290,745 B1Parent of this division
US 6,485,674 B2This patent

From the US filing history. Foreign family members aren’t listed.