SU612769A1 - Solder for soldering articles made of heat-resistant hard materials - Google Patents

Description

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satisfactory mineramineceramma.

The aim of the invention is to improve the quality of iica solder by increasing the hardness and heat resistance.

For this, we propose a solder for thermocouples of highly resistant high-solid materials, mainly corundum-based mineral ceramics, containing copper, manganese, metal of the iron subgroup, metal selected from the group; tin, cadmium, bismuth, lead, a metal selected from the group: molybdep, chromium, tungsten, additionally contains chromium carbide in the following ratio of comonents, weight. %;

Chromium carbide10-50

Metal selected from the group: molybdenum, chromium, tungsten 5-50

Iron Subgroup Metal1-20

Manganese1-20

Metal selected from the group: tin, cadmium, bismuth, sweets1 -10 Copper Else

The proposed solder consists of two frame refractory phases: chromium carbide particles n molybdenum chromium, tungsten and one low-melting (solid at the time of soldering) phase in the form of a copper alloy, a metal of the iron subgroup, manganese, tin and a particle of molybdenum (chromium, tungsten) dissolved in the alloy. ).

Chromium carbide is the main framework component, which provides heat resistance and hardness of solder. Compared to other compounds of the class of carbides or borides that can be used for these purposes, it is distinguished by its minimum deficiency, degradation, and also, as studies show, it is wetted by copper-based alloys at low temperatures in the range of 1000-1200 ° WITH. Other well-known hard and refractory compounds, such as tungsten, molybdenum, titanium carbides, are more expensive and form less durable cermet with copper alloys because of their less wettability by copper alloys at temperatures of about 1000 ° C. Such cheap material as silicon carbide is intensively decomposed by copper alloys, etc. Molybdenum also significantly increases the heat resistance of solder and, dissolving partially in the low-melting part of the alloy, along with manganese contributes to the wetting of corundum materials.

Studies show that the low-melting part of the solder containing metal of the iron subgroup, copper, manganese, dissolves up to 5-10% molybdenum under soldering conditions. Such an alloy, already at a temperature of 1000-1200 ° C, has an acute wetting angle from oiongeium to corundum and spreads over its surface. Chromium and molybdemia carbide are interchangeable to a certain extent.

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components. When they are contained in the solder, the indicated amounts do not have sufficient strength properties, with an increase in their content above the specified upper limit, the syria has a soldering temperature exceeding the temperature resistance of the steel body.

The introduction of iron subgroup metal increases the strength properties of solder, manganese contributes to the wetting of corundum and plays the role of a deoxidizing agent, tin is the TopOiM regulator of the soldering temperature and increases the strength of the solder, copper is the main component of the solder that determines its soldering temperature and

properties. When the content of nickel, tin, manganese in quantities smaller than those contained in the composition of the solder, these elements do not fulfill their purpose, exceeding their content worsens the properties of the solder,

as an increase in the metal content of metal nodgr ppa iron excessively raises the temperature of soldering, increasing the amount of manganese and tin protects the solder. Example 1. Mineral-ceramic-based cylinders with a flexural strength of more than 50 kg / mm are fixed in the hollow groove of a steel body with solder of the following composition, weight. %: chromium carbide 35; chromium 5.5; nickel 5.25; iron 13.25; copper 30; manganese 9.9; tin 1.1.

A mixture of chromium powders and a KHP115 carbidochrome mixture (85% of chromium carbide and 15% nickel) was represented by a mineral-ceramic cylinder that was bonded to it. Karkae is impregnated with copper - lazo - manganese - tin alloy. Impregnation is carried out on a HDTV installation in a multi-graphite form node with a flux of N ° 209 at 1170 ° C and a shutter speed of 7 minutes.

Example 2. Mineraloceramics cylinders are fixed in a hollow groove of an etalpable body with solder of the following composition, weight. %: chromium carbide 12.5; molybdenum 8; iron 18.5; copper 43.7; manganese 18.8; tin 8.5.

The framework is impregnated from chromium carbide, molybdenum and l powders: iron is produced at 1020 ° C and lasts for 7 minutes.

Example 3. Mineral-ceramic cylinders are fixed in a hollow groove of an etalpous body with solder of the following composition, weight. %: chromium carbide 44.8; molybdenum 47.3; nickel 1.5; manganese 1,2; tin 1.0; copper 4.3.

A mixture of powders of the specified composition with a cylinder of mineral-ceramic, loaded

in a hollow groove of a steel body, subjected to hot pressing in a graphite multi-molding mold at 1200 ° C, a pressure of 200 kg / cm2, lining out 3 min.

Example 4. Cylinders of a diameter of 7 mm and a height of 6 mm from corundum-based mite-metal ceramics with a flexural strength of more than 50 kg / cm into the steel housing of the steel body with the following composition, wt. %: chromium carbide 25; molybdenum 25; Nickel 3.25;

iron 6.25; manganese 9; copper 27; tin 4.

The impregnation of the framework from molybdenum powders and the chromium carbonaceous mixture KHN 15 is produced by a copper – iron – manganese – tin alloy at IEE and a shutter speed of 7 minutes. Steel housings with mineral-ceramic cylinders pressed into them are used to grind through-through cutters on them.

The use of the proposed composition makes it possible to create a new type of cutting tool — sealed incisors of high-strength corundum-based mineral ceramics. Such cutters have a reliable fastening of the cutting element in the harshest operating conditions and a wide prospect of introduction of iron and steel with a hardness of 40-50 Re in case of rough cutting instead of tools from hard metal.

Claims (2)

1. USSR author's certificate number 383354, cl. In 24D, 1971. 2. Forward number 2151614/27, 07/04/75, according to which the decision was taken to issue certificates.