RU2335385C1 - Solder on silver base - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: solder contains components at a following combinations, wt % : silver 39-41; copper 34-36; zinc 14-16; indium 9-11.

EFFECT: upgraded of production safety; expanding process capabilities and reduction of problems at fabricating and application of given solder in production.

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Description

The present invention relates to the field of metallurgy of silver-based alloys and can be used in the jewelry industry, electronics, electrical engineering and instrumentation.

Known solders based on silver, copper and zinc, designed for soldering in the temperature range of 610-1000 ° C and widely used to obtain integral products (Lashko N.F. Soldering of metals / N.F. Lashko, S.V. Lashko. - M .: "Mechanical Engineering", 1967. - P.211).

Known solder based on silver grade PSR 45 (GOST 19738-74), containing, wt.%:

Silver 44.5-45.5 Copper 29.5-30.5 Zinc 23.5-26.0.

This solder has an increased soldering temperature of 780 ° C, high strength 363-500 MPa, but low ductility, which limits its use.

The closest in the set of essential features, in terms of technical nature and the achieved result, is a solder based on silver grade PSR 40 (GOST 19738-74), containing, wt.%:

Silver 39.0-41.0 Copper 16.4-17.4 Zinc 16.6-17.8 Cadmium 26.0-26.5.

This solder has a reduced soldering temperature of 620 ° C, a satisfactory strength of 372-431 MPa and a fairly high ductility. However, a significant drawback of this solder is its cadmium content. Cadmium compounds are very toxic, have harmful effects on the human body and cause occupational diseases, which creates certain difficulties in the manufacture and use of this solder in production, imposes increased requirements for industrial safety and, ultimately, reduces the technological possibilities of using this solder.

The main objective of the invention is to expand the technological capabilities of the use of solder and increase industrial safety.

The problem is achieved in that the silver-based solder containing copper and zinc additionally contains indium in the following ratio of components, wt.%:

Silver 39-41 Copper 34-36 Zinc 14-16 Indium 9-11.

The inventive solder in comparison with the prototype is characterized by distinctive features that allow you to expand the technological capabilities of the use of solder and increase production safety.

In relation to the prototype, the proposed solder has the following distinctive features: silver based solder containing copper, zinc, additionally contains indium in the following ratio of components, wt.%:

Silver 39-41 Copper 34-36 Zinc 14-16 Indium 9-11.

Indium compounds are practically harmless to the human body, which significantly reduces difficulties in the manufacture and use of this solder in production, does not impose increased requirements for industrial safety and, thereby, expands the technological capabilities of this solder.

Thus, there is a causal relationship between the hallmarks and the task at hand. Replacing cadmium with indium in a silver-based solder containing copper and zinc allows us to expand the technological capabilities of using solder and increase production safety.

To obtain the proposed solder, compositions were prepared whose chemical composition and properties, in comparison with the known solder, are given in Tables 1 and 2.

Table 1 Solder Composition No. The content of components, wt.% Silver Copper Zinc Cadmium Indium Proposed one 39.0 34.0 16,0 - 11.0 2 40,0 35.0 15.0 - 10.0 3 41.0 36.0 14.0 - 9.0 Famous four 40,0 16.9 16.9 26.2 -

table 2 Solder Composition No. Temperature ° C Tensile strength, MPa solidus liquidus soldering Proposed one 590 608 608 364-422 2 592 614 614 368-426 3 595 618 618 370-430 Famous four 595 620 620 372-431

Replacing silver-based solder containing copper, zinc and cadmium, cadmium to indium practically did not change the properties of the solder, which will ensure high-quality soldering of products, and the absence of cadmium in the solder will expand the technological capabilities of using the solder and increase production safety.

Thus, the use of the inventive solder in comparison with the prototype allows you to expand the technological capabilities of the use of solder and increase production safety.

Claims (1)

Silver-based solder containing copper and zinc, characterized in that it additionally contains indium in the following ratio of components, wt.%: Silver 39-41 Copper 34-36 Zinc 14-16 Indium 9-11