Wyniki wyszukiwania - BazTech

1

Temperature and pressure properties of the resistance alloy ZERANIN30 implanted by high dose, middle energy, C+ ions

Wilczyńska T., Wiśniewski R., Konarski P.

Przegląd Elektrotechniczny

|

2012

|

R. 88, nr 10a

292-295

EN

The influence of carbon ions implantation into Zeranin30 alloy on their sensitivities to pressure and temperature has been investigated . Specimens were foil type, 20µm thick and planar dimensions 1x50mm). The C+ ions, of energy 100, 150 and 250keV, were implanted on the one side of specimens with doses of 1-, 2- and 3x10 17 ions C+/cm2 respectively. Depth distribution of carbon ions were calculated using SRIM method. The implantation range was less than 0.5µm. Due to C+ ions implantation of max energy and dose a12% increase of mean pressure sensitivity of specimens was noted. Using developed earlier method for more accurate interpretation of implanted flat specimens it was possible to determined properties of modified layer we can estimate the pressure sensitivity coefficient (PSC) of the strongly implanted part as three times higher than the value for not implanted one. High-dose implantation with C+ ions remarkably changes also the temperature - resistance characteristic of Zeranin30 specimens, making it more convenient for the use in the further vicinity of the room temperature. The thermo power of implanted Zeranin30 against copper at room temperature appeared to be about 30% smaller than those for not implanted one. SIMS method of determination of concentration of basic Zeranin30 components and introduced C was used. An anomalous concentration of basic component in depths of 300nm has been observed. The maximal depth of implanted carbon atoms was detected as less than 1µm. Investigated specimens were annealed before and after implantation by 100h at temperature of 150oC.

PL

W pracy przedstawiono wpływ średnio-energetycznej, wysoko dawkowej implantacji węglem Zeraninu30 na charakterystykę rezystancja - temperatura oraz na czułość ciśnieniową. Próbki miały wymiary 20µm x2mm x50mm. Zastosowano energie implantacji 100,150 i 250keV i jednostronną implantację dawkami 1- ,2- i 3x1017 jonow C+ / cm2, odpowiednio. Do określenia rozkładu jonów węgla użyto kodu SRIM 2000 określającego maksymalny zasięg na 0.5µm. Po implantacji maksymalną energią i dawką zauważono 12% wzrost średniego współczynnika czułości ciśnieniowej. Stosując metodę określania właściwości warstw silnie implantowanych w próbkach planarnych określono jego trzykrotny wzrost w stosunku do czułości ciśnieniowej zeraninu czystego. Zaobserwowano, korzystne dla zastosowań, rozpłaszczanie się charakterystyki R-T w okolicy temperatury pokojowej, oraz niewielki (30%) spadek siły termoelektrycznej zeraninu30 względem miedzi w temperaturze pokojowej. Metodą SIMS określono rzeczywiste rozkłady podstawowych składników Zeraninu i zaimplantowanych jonow C (z zasięgiem 1µm) stwierdzając anomalne wartości koncentracji składników podstawowych w głębokościach do 200nm. Próbki przed i po implantacji były stabilizowane termicznie w temperaturze 150oC w czasie 100h. (Temperaturowe i ciśnieniowe właściwości rezystancyjnych stopów ZERANIN30 implantowanych jonami C+ o wysokich dawkach i średnich energiach).

2

The role of surface and bulk structure in the thermopower characterization of perlitic carbon steels

Szabo A., Lovas A.

International Journal of Applied Mechanics and Engineering

|

2010

|

Vol. 15, no 2

349-354

EN

For the study of stress state and the level of heat treatment in engineering alloys, the thermo power (S) measurement is proposed as an acceptable method after a suitable calibration. In this paper, we focus on the determination of the influence of phase relations from the point of view of thermo power using industrial pearlitic carbon steels. The results of thermoelectric power measurements reported in this paper do confirm the applicability of S (T) measurements as non-destructive testing of quench hardening in pearlitic steels.

3

Scanning thermoelectric and acoustic emission diagnostic of structural inhomogeneities of thermocouple materials

Prokhorenko V. J., Prokhorenko S. V., Mudry S. I., Sheregii E. M., Dominjuk T. I.

Archives of Foundry Engineering

|

2010

|

Vol. 10, iss. 1 spec.

381--386

EN

New method for diagnostic of constructional and functional materials by means of thermoelectric and acoustic- emission measurements is proposed. The method allows not only to establish the defect location, but its partial temperature relaxation achieve.

4

Application of the method of thermo-power in diagnosing fatigue strength and intergrain corrosion

Prokhorenko V. J., Prokhorenko S. V., Koval P. M., Dominjuk T. I.

Archives of Foundry Engineering

|

2009

|

Vol. 9, iss. 2

201-204

EN

In area of flat defect, predefined a gradient tireless - corrosive tensions, a double electric layer, conditioned the spatial redistribution of electronic closeness, is formed. It shows up a local rejection mikro-thermo-power at use of heating edge of tungsten thermocouple. Test approbation of method is conducted on the deformed chromel.

5

Physical and technological preconditions of melting-crystallisation temperature stabilisation

Prokhorenko V., Prokhorenko S., Mudry S., Bylica A.

Archives of Materials Science and Engineering

|

2008

|

Vol. 32, nr 1

29-32

EN

Purpose: The precise temperature measurements need the using of temperature reference points - "temperature fixpoints" (TFP). The increase of measuring temperature interval and other reasons require of new TFP with high stability in different working conditions. On that reason the studying of liquid metals and metallic eutectic alloys has been carried out in this work. Design/methodology/approach: For experimental studies the physical properties measurements were used. Findings: Non-reproducibility of temperature fixpoints exist due to some reasons: no accounting the structural - thermodynamic state of melt; mass-heat processes are not enough taken into account. It is fixed, that the temperature fluctuations (and non-stability of crystallization plateau) are of two types: small fluctuations (up to (1-2) mK) are caused by phases (stages) of crystallization process; major fluctuations (at us: ±0,2K) crystallizations are caused convectional streams at the front. Fluctuations can be essentially reduced by approach to requirements of thermodynamic balance, but their complete elimination - is problematic. Research limitations/implications: The main parameters obtained from them are analysed. It is shown that melting-crystallization phase transition is influenced by structural state of melt and cooling condition. Practical implications: The results obtained here can be used in analysis of errors at high-precision temperature measurements and constructing of new temperature measuring and holding systems of high stability. Originality/value: The results of this study can be useful for researches in field of metrology, material science and physics of metals.