Characteristics of Electrical Contact of Internally Oxidized Silver-Zinc Alloys Containing Several Additional Elements

Sato, Mitsunori; Hijikata, Masayuki

doi:10.2320/matertrans1960.23.267

Cited by 3 publications

(3 citation statements)

References 14 publications

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“…Theoretical density of composites, ρ t , was calculated according to relation [13][14][15]: (1) where V is volume fraction, ρ -density while f and m indexes correspond to filler (metal oxide powder) and matrix (silver powder), respectively.…”

Section: Characterizationmentioning

confidence: 99%

“…Electrical contact materials based on silver-metal oxide composites are very important functional materials which are commonly used in different low voltage DOI:10.2298/JMMB111101013C switchgear devices such as contactors, relays, circuit breakers and switches [1][2][3][4]. Since electrical contact materials are used in diverse exploatation conditions, different types of silver based contact materials have been developed in order to meet the requirements for different applications.…”

Section: Introductionmentioning

confidence: 99%

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Comparison of properties of silver-metal oxide electrical contact materials

Ćosović¹,

Talijan²,

Živkovič

et al. 2012

J min metall B Metall

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Changes in physical properties such as density, porosity, hardness and electrical conductivity of the Ag-SnO2 and Ag-SnO2In2O3 electrical contact materials induced by introduction of metal oxide nanoparticles were investigated. Properties of the obtained silver-metal oxide nanoparticle composites are discussed and presented in comparison to their counterparts with the micro metal oxide particles as well as comparable Ag-SnO2WO3 and Ag-ZnO contact materials. Studied silvermetal oxide composites were produced by powder metallurgy method from very fine pure silver and micro- and nanoparticle metal oxide powders. Very uniform microstructures were obtained for all investigated composites and they exhibited physical properties that are comparable with relevant properties of equivalent commercial silver based electrical contact materials. Both Ag-SnO2 and Ag- SnO2In2O3 composites with metal oxide nanoparticles were found to have lower porosity, higher density and hardness than their respective counterparts which can be attributed to better dispersion hardening i.e. higher degree of dispersion of metal oxide in silver matrix

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Section: Characterizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Comparison of properties of silver-metal oxide electrical contact materials

Ćosović¹,

Talijan²,

Živkovič

et al. 2012

J min metall B Metall

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“…However, very soon it became obvious that Sn-oxide does not satisfy all the considered criteria either [ 25 ]. Numerous oxides have been investigated since then, and the oxides of rare earth elements have also been recognised as promising candidates [ 25 , 26 ]. One of them, namely La-oxide, has already been identified as a highly stable compound which does not decompose easily, and, therefore, increases the viscosity of molten silver and reduces the splash erosion [ 15 , 27 ].…”

Section: Introductionmentioning

confidence: 99%

Oxidation Behaviour of Microstructurally Highly Metastable Ag-La Alloy

et al. 2022

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A new silver-based alloy with 2 wt.% of lanthanum (La) was studied as a potential candidate for electric contact material. The alloy was prepared by rapid solidification, performed by the melt spinning technique. Microstructural examination of the rapidly solidified ribbons revealed very fine grains of αAg and intermetallic Ag5La particles, which appear in the volume of the grains, as well as on the grain boundaries. Rapid solidification enabled high microstructural refinement and provided a suitable starting microstructure for the subsequent internal oxidation, resulting in fine submicron-sized La2O3 oxide nanoparticle formation throughout the volume of the silver matrix (αAg). The resulting nanostructured Ag-La2O3 microstructure was characterised by high-resolution FESEM and STEM, both equipped with EDX. High-temperature internal oxidation of the rapidly solidified ribbons essentially changed the microstructure. Mostly homogeneously dispersed nano-sized La2O3 were formed within the grains, as well as on the grain boundaries. Three mechanisms of internal oxidation were identified: (i) the oxidation of La from the solid solution; (ii) partial dissolution of finer Ag5La particles before the internal oxidation front and oxidation of La from the solid solution; and (iii) direct oxidation of coarser Ag5La intermetallic particles.

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