| Partner: Piotr Borkowski |
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Ostatnie publikacje
| 1. | Borkowski P.♦, Pietrzak K.♦, Frydman K.♦, Wójcik-Grzybek D.♦, Gładki A.♦, Sienicki A.♦, Physical and electrical properties of silver-matrix composites reinforced with various forms of refractory phases, ARCHIVES OF METALLURGY AND MATERIALS, ISSN: 1733-3490, DOI: 10.24425/122408, Vol.68, No.2, pp.817-823, 2018 Streszczenie: This paper presents technological trials aimed at producing Ag-W, Ag-WC, Ag-W-C and Ag-WC-C composite contact materials and characterizing their properties. These materials were obtained using two methods, i.e. press-sinter-repress (PSR) at the refractory phase content of less than 30% by weight as well as press-sinter-infiltration (PSI) at the refractory phase content of ≥50% by weight). The results of research into both the physical and electrical properties of the outcome composites were shown. They include the analysis of the influence of the refractory phase content (W or WC) on arc erosion and contact resistance changes for the following current range: 6 kAmax in the case of composites with a low refractory phase content, 10 kAmax in the case of composites with the refractory phase content of ≥50% by weight. Słowa kluczowe: composite materials, electrical contacts, arc erosion, contact resistance Afiliacje autorów:
|  | 30p. | ||||||||||||||||||
| 2. | Pietrzak K.♦, Frydman K.♦, Wójcik-Grzybek D.♦, Gładki A.♦, Bańkowska A.♦, Borkowski P.♦, Effect of carbon forms on properties of Ag-C composites contact materials, MATERIALS SCIENCE, ISSN: 1068-820X, DOI: 10.5755/j01.ms.24.1.17769, Vol.24, No.1, pp.69-74, 2018 Streszczenie: This paper presents the manufacturing method of silver based composite materials containing 3 % vol. carbon forms (nanotubes and graphene). The most significant challenge was to obtain good dispersion of carbon in the metallic matrix. The applying of suitable dispersants allows to get uniform distribution of carbon reinforcement. Triton X-100 and ultrasonic support were used in the powder mixing process. Ag-nanotubes and Ag-graphene contact tips were made using Spark Plasma Sintering process (SPS). The results of research into both physical and electrical properties of these composites are presented. It has been demonstrated that the form of introduced carbon exerts influence on the electrical characteristics of contacts, and particularly on arc erosion. Performed electrical test indicated that Ag-nanotubes contacts showed higher resistance to arc erosion than Ag-graphene contacts. It can be explained by the better dispersion to individual carbon nanotubes their lower than for graphene edge defects density and due to this higher thermal and electrical conductivity. Słowa kluczowe: composite materials, silver-nanotubes, silver-graphene, arc erosion, contact resistance Afiliacje autorów:
| | 15p. |