Five laboratories were asked to deposit Ni and Ni20Cr powders to obtain resistors; we studied their electrical properties in the temperature range 20-500 C and interpreted the results in the light of their microstructure. Resistors sprayed from Ni powders consist of NiOx "islands" embedded in a Ni matrix. The temperature dependence of resistance (TCR) is in perfect agreement with that of pure Ni, indicating that the matrix detections. the electrical transport. Annealing at temperatures from 200 to 400C results in an irreversible decrease of resistance. A multiphase microstructure is observed in resistors prepared from 80Ni20Cr powders. The major phase in these resistors is a NiCr alloy but with a Ni:Cr ratio larger than 80:20. Minor amounts of metal oxides are also detected. The TCR in these samples spans from 180 ppm/C to 2830 ppm/C, and is attributed to different degree of oxidation and segregation of the metals in the alloy.

Electrical properties of thermally sprayed Ni- and Ni20Cr-based resistors / Prudenziati, Maria; Gualtieri, Eva Magdalena. - In: JOURNAL OF THERMAL SPRAY TECHNOLOGY. - ISSN 1059-9630. - STAMPA. - 17(2008), pp. 385-394.

Electrical properties of thermally sprayed Ni- and Ni20Cr-based resistors

PRUDENZIATI, Maria;GUALTIERI, Eva Magdalena
2008

Abstract

Five laboratories were asked to deposit Ni and Ni20Cr powders to obtain resistors; we studied their electrical properties in the temperature range 20-500 C and interpreted the results in the light of their microstructure. Resistors sprayed from Ni powders consist of NiOx "islands" embedded in a Ni matrix. The temperature dependence of resistance (TCR) is in perfect agreement with that of pure Ni, indicating that the matrix detections. the electrical transport. Annealing at temperatures from 200 to 400C results in an irreversible decrease of resistance. A multiphase microstructure is observed in resistors prepared from 80Ni20Cr powders. The major phase in these resistors is a NiCr alloy but with a Ni:Cr ratio larger than 80:20. Minor amounts of metal oxides are also detected. The TCR in these samples spans from 180 ppm/C to 2830 ppm/C, and is attributed to different degree of oxidation and segregation of the metals in the alloy.
17
385
394
Electrical properties of thermally sprayed Ni- and Ni20Cr-based resistors / Prudenziati, Maria; Gualtieri, Eva Magdalena. - In: JOURNAL OF THERMAL SPRAY TECHNOLOGY. - ISSN 1059-9630. - STAMPA. - 17(2008), pp. 385-394.
Prudenziati, Maria; Gualtieri, Eva Magdalena
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11380/597943
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