SU970483A1 - Method of producing cast microwire - Google Patents

Description

(54) METHOD OF MANUFACTURING CAST MICROPRODUCT

one

The invention relates to cable technology, in particular, to the technology of manufacturing molded microwires in glass insulation.

A known method of making cast microwires in glass insulation includes placing a sample of a vein-forming material inside a glass tube, melted tubes with a suspension in a high-frequency inductor field, creating pressure inside the tube acting on the microdynamic surface, forming a micron tube, drawing a capillary from it . Before the melting begins, the sample is heated in the zone of the high-frequency inductor to a temperature at which the depth of the sample becomes equal to its transverse dimensions, this heating is stopped when the sample begins to melt, and the glass tube is blown with an inert gas from the inside and outside, creating by means of the said internal blowing; and drawing out a glass capillary filled with a vein-forming material 1.

However, when using cast microwires obtained by a known method, for the production of various products based on it, for example, galvanomagnetic elements, thermistors, strain gauges

5 and others, there is a need for precision grinding and etching of the specified microwire to obtain a flat profile from a semiconductor crystal from its core, in which the quality of the products and their Q quality is much higher, in particular, due to the simplification of the contact technology than when using the microwire with Residential round section. The need for the above described processing of microwires complicates the technology for the production of products based on it, reduces the utilization rate of the microwires and leads to an increase in the technological costs of expensive semiconductor material.

The purpose of the invention is to extend the functional capabilities of the 20s, increasing the microwire's processability by making its core flat.

The goal is achieved by creating interfacial tension with various

largest in two mutually perpendicular radial directions.

Ensuring this difference is achieved in several ways: they change the direction of the capillary draw in the zone of its extension, including the crystallization front, for example, by bending the horizontal support with a capillary, which is cooled, maintain the volume flow rate of indium antimonide, at least 4 times greater than the volume flow of glass.

In the indicated variants of the proposed method, the difference in the surface tension values at the glass-vein-forming material boundary arises either due to the additional force effect in one of the directions lying in the cross section of the microwire, or due to the reduction of the isotronic force effect of the tempered glass material and at the same time, the intrinsic anisotropy of the properties of this material.

Claims (5)

Experiments have shown that in the process of manufacturing a cast microwire with a core of semiconductor materials, while providing glass-core-forming material at the interface with different values of surface tension in two mutually perpendicular directions, the core forms and crystallizes in the form of a flat crystal, whose cross section and shape parallelepiped and in particular a rectangle. The largest transverse dimensions of the cores are formed in the direction along which the surface tension at the glass-to-vein-forming material has the smallest value. Claim 1. A method of manufacturing a cast microwire in glass insulation with a core of semiconductor or semimetallic materials, including melting of a vein-forming material inside a glass tube to form a micanna, drawing a capillary filled with a melt of the aforementioned vein-forming material from the glass shell, with subsequent crystallization of the said material inside kaq pill, characterized in that, in order to expand the functionality of improving the microwire processability by performing its lived flat, interfacial tension created in two different mutually perpendicular largest radial directions. 2. A method according to claim 1, characterized in that the difference in interfacial tension provides a ratio between the volume expenses of glass and vein-forming material. 3. A method according to claim 2, characterized in that for a microwire with a vein of germanium, bismuth and indium antimonide, the volume flow of the vein-forming material is maintained at least 4 times as large as the volume flow of glass. 4. A method according to claim 1, characterized in that the difference in the interfacial tension is ensured by changing the direction of drawing the capillary in its area from the microscopic to the point behind the crystallization front of the core. 5. A method according to claim 4, characterized in that the change in the direction of drawing is carried out at the point of crystallization of the core, for example, by bending around a cooled horizontal support. № Sources of information taken into account during the examination 1. USSR author's certificate 765888, cl. H 01 H 13/06, 1980.