CPPP 26 P The strength properties of bifilar microwires based on bismuth and tin
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2022-11-05 12:03
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MEGLEI, Dragoş, DYNTU, M., DONU, Sofia. CPPP 26 P The strength properties of bifilar microwires based on bismuth and tin. In: Materials Science and Condensed Matter Physics, 13-17 septembrie 2010, Chișinău. Chișinău, Republica Moldova: Institutul de Fizică Aplicată, 2010, Editia 5, p. 153.
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Materials Science and Condensed Matter Physics
Editia 5, 2010
Conferința "Materials Science and Condensed Matter Physics"
Chișinău, Moldova, 13-17 septembrie 2010

CPPP 26 P The strength properties of bifilar microwires based on bismuth and tin


Pag. 153-153

Meglei Dragoş, Dyntu M., Donu Sofia
 
Institute of the Electronic Engineering and Nanotechnologies "D. Ghitu"
 
Disponibil în IBN: 16 aprilie 2021


Rezumat

The experience of using microwires in glass insulation in electric measurement engineering has set the problems of searching and studying new reliable and stable materials with small dimensions and improved electrical and mechanical properties. I n this work, we describe the results related to the technology for obtaining bifilar microwires (BMs) based on bismuth and tin in glass insulation and study the perfection of their microstructure and strength characteristics: tensile strength (σ, kg/mm2) and critical bending radius (rcr, mm) as a measure of elasticity. Microscopic studies of the resultant BM showed that it is homogeneous and has a smooth cylindrical surface. The sizes of defects on its surface in the form of pores, microcracks, dislocations, and twins are much smaller than for microwires of pure bismuth and pure tin. The high structural perfection of the BM is confirmed by the low density of dislocations 104-106 cm-2; for a single-core microwire of pure bismuth, it ranges within 105-107cm-2. Mechanical studies showed that the BM has higher values of bending elasticity and tensile strength than single-core microwires of pure bismuth and pure tin. For example, the critical bending radius of the BM is in a range of 0.37-1.40 mm with respect to the outer diameters of 30.2-234 mm, and rcr of a pure tin microwire takes the values of 0.52-2.52 mm for respective diameters of 21.9-74.3 mm. The tensile strength σ of the BM per unit cross-section of the sample together with the glass is much higher than σ of a single-core microwire of pure bismuth or tin; it ranges within 62.8-10.9 kg/mm2 with respect to the outer diameters of 38.4-135.3 mm and can withstand a breaking force up to 200 g and more. The following phenomenon takes place: notwithstanding that BMs have relatively large outer diameters (30-234 mm), their tensile strength increases and the critical bending radius decreases with decreasing diameters. A technique for preparing samples of BMs under study suitable for instrumentation applications is proposed.