Open AccessSynthesis of NTC thermistors with screen printing method from natural yarosite minerals
Author(s) -
Iga Purwitasari Aningratri,
Nazriati Nazriati,
Dani Gustaman Syarif
Publication year - 2021
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.179
H-Index - 26
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/1053/1/012012
Subject(s) - thermistor , materials science , ceramic , sintering , oxide , screen printing , temperature coefficient , grain size , metallurgy , composite material , mineralogy , electrical engineering , chemistry , engineering
NTC thermistors can make from a mixture of metal oxides. Fe 2 O 3 is a metal oxide contained up to 93.80% in the natural yarosite mineral and has the potential to be used as a material for making thermistors. The objective of this research is to use Fe 2 O 3 from yarosite and Fe 2 O 3 from imports in the production of NTC thermistor and to determine the effect of adding ZrO 2 to a mixture of Fe 2 O 3 from yarosite, ZnO and CuO in the manufacture of thick-film oxide ceramic NTC thermistors. Oxide ceramic powder is synthesized, using the sol-gel method. Furthermore, oxide ceramic powder was made into thick-film oxide ceramics made by screen printing technique with a sintering temperature of 1100°C for 2 hours, then characterized using XRD and SEM. After a thick-film oxide ceramic was coated, with silver paste, an NTC thermistor was obtained and measured its electrical resistance to temperature using a multimeter and temperature controller. The results of the analysis of XRD characterization reveal that the crystal system of the ceramic mixture from the samples was rhombohedral. Based on the results of SEM analysis, the addition of ZrO 2 doping showed a change in grain size to be smaller. NTC thermistors with raw materials Fe 2 O 3 from yarosite, ZnO, and CuO (Sample I) have resistance which decreases with increasing temperature according to the characteristics of NTC thermistors and has better electrical characteristic than Fe 2 O 3 from imports, ZnO, and CuO (Sample III) for NTC thermistor applications that are preferred commercially. The addition of ZrO 2 doping (Sample II) increases the resistance.