SU1234090A2 - Method of contact-reacting soldering - Google Patents

Description

The invention relates to soldering, in particular, to a method of contact-reactive soldering of carbide and high-speed tools, and can be used in tool manufacturing in the manufacture of bimetallic tools.

The aim of the invention is to improve the quality of the solder joint.

The method is carried out in the following manner.

The copper intermediate layer was fabricated and a copper coating was applied to the boride layer, an additional zinc coating was applied to the copper coating, and the coated parts were subjected to diffusion homogenizing annealing at 360 for 3-4 hours.

In addition, in order to reduce the labor intensity of manufacturing the solder, a 66-layer layer is first coated with zinc and then copper.

As a material for laying, use is made of a 0.3 mm thick foil made of steel 12X18H10T, which is subjected to boronation, electrolytic copper plating, galvanizing and diffusion annealing at 360–380 ° C for -3–4 h, or on a boronized layer of nano with zinc coating , and on it from copper (without further annealing).

The thickness of the boride layer is 0.03-0.04 mm zinc 0.02 mm, copper 0.03 mm. Soldering temperature lOZO-IOAO C.

When a zinc layer is placed on the boride layer under a copper layer, the evaporation rate of zinc slows down even with rapid heating (above 3–30 ° C / s), for example, a hard alloy in HDTV sets, diffu: zion annealing is not performed.

In the process of heating for brazing, the zinc melt is enriched with copper from the solid phase, which raises the melting temperature, the zinc-copper system, and when the temperature reaches 1020 -2040 ° C in the liquid phase, it is doped with boiling. .

When copper is applied to the boride layer first, then an additional zinc coating is used to prevent its evaporation (zinc boiling point 907 ° C) and to homogenize the copper and zinc layer in terms of chemical composition and structure before brazing, ZbO-ZVO C is performed.

for 3-4 hours in a non-oxidizing atmosphere.

As a result of this treatment, an alloy of copper and zinc (of variable composition) is formed on the surface of the plate. The structure of the alloy is characterized by the presence of significant areas with an ordered structure similar to the solid solution of the beta-stroke (copper atoms are located at the vertices of the cubic crystal lattice, and zinc atoms at its center). The structure of the weld seam (with the presence of the mentioned areas) is characterized by high ductility and high strength, namely: 60–80 kgf / mm (which is 20–40 and 30–60 kgf / mm Bbmie, respectively, of similar brass and pure (industrial ) copper). The strength is also due to the fact that the copper-zinc alloy is formed in the solid state, the liquid phase is mined. This determines its extremely high dispersion.

In addition, when brazing using this method, penetration diffusion of boron (towards hard alloy and high-speed steel) and cobalt hard alloy in brass decreases sharply, which ensures high strength and ductility characteristics of the weld, weld and base metal, as a result of which and increases the term of his service.

Example. An intermediate strip of steel 12Kh18NYuT 0.3 mm thick was subjected to boronization in a mixture of boron carbide (82 May.%), Borax (16%) and ammonium fluoride (2%) in a container with a sand gate.

Boroning mode: temperature 950 ° С, discharge time 6 h. Depth of boride layer 0.03-0.04 mm.

Then, a zinc layer of 0.02 mm thick was deposited by electroplating on the boride layer and a layer of copper 0.03 mm thick was deposited on it or (in another version) a layer of copper 0.03 mm thick was applied to the boride layer and 0% thick zinc layer was applied to the boride layer. 02 mm. In the latter case, the copper and zinc layer was subjected to diffusion annealing at 360–380 ° C for 3–4 h in a non-oxidizing atmosphere (in a container with spent wood-carbon carburizer), obtaining brass on the surface: 30–40 wt. .%, zinc 70-60%.

When zinc was applied to the boride layer (without annealing), due to the low adhesion of the coating, when cutting scissors into narrow strips of solder up to 5 mm wide, there were cases of flaking of the zinc – copper coating from the boride layer.

TZOK4 carbide plates were soldered to the tool holders at the HDTV installation at 1020-1040 ° С, a drill was used as a flux.fO

Plate thickness TZOKA-1.5 mm ,, width 3 mm, length 22 mm. Cutters special carving section of 5x16 mm.

The hardness of the processed material is HRC 52-54, thread is cut-resistant 70x1.5 mm, cutting speed 27.7 m / min, depth 0.07 mm, feed 1.5 mm / rev.

Editor M. Bandura

Compiled by F. Teslin Tehred O. Sopko

Order 2934/14 Circulation 1001Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Project, 4

five

ABOUT

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The number of drilled and tested cutters is 25 pcs.

The best quality of the solder joint is the hard alloy TZOK4 - steel 45 obtained by brazing parts with a coating subjected to diffusion annealing.

The method of contact-reactive soldering can be used in any factory that manufactures high-speed and carbide tools.

The method of contact-reactive soldering, when soldering plates of TZOK4 with a thickness of up to 3 mm, provides a better-quality solder joint by inhibiting the solubility of cobalt in copper in the presence of zinc and a lower temperature (1020-1040 C) soldering.

Foreman A. Ferenc

Claims (3)

METHOD OF CONTACT-REACTIVE BRAZING by ed. R 1186413, on the subject of the fact that, with a view to. to improve the quality of the soldered joint, the intermediate gasket is additionally coated with zinc. 2. The method according to and. 1, the fact that the boron layer is coated with zinc and then copper. 3. The method of claim 1, wherein zinc is applied to the copper coating and the coated parts are subjected to homogenizing annealing at 360-380 ° C for 3-4 hours. G S *, 1234090