Title :
Correlation of surface contamination introduced by feeding equipment on electrical contact resistance
Author :
Francisco, H.A. ; Koeneke, K. ; Wallace, J.
Author_Institution :
Deringer Manuf. Co., Mundelein, IL, USA
Abstract :
Contact degradation caused by austenitic stainless steel feeder bowls has raised concern among manufacturers of electrical contacts. The surface contamination of three contact materials, fine silver, silver cadmium oxide (90%Ag 10%CdO), and a silver alloy (75%Ag 24.5%Cu 0. 5%Ni) with 15-microinch (Ra) surface finish, was investigated. Contact resistance probing was employed and surfaces were analyzed to explain the degradation process. The investigation elucidated the effects of various vibratory feeder bowl coatings which reduced surface contamination. The attainment of low contact resistance was explained as interactions among nobility of contact material, type of coating, and time spent in the vibratory feeder bowl.<>
Keywords :
austenitic stainless steel; contact resistance; electrical contacts; quality control; Ag contacts; Ag-CdO contacts; Ag-Cu-Ni alloy contacts; austenitic stainless steel feeder bowls; contact degradation; contact resistance probing; degradation process; electrical contact resistance; electrical contacts manufacture; feeder bowl coatings; feeding equipment; surface contamination; time spent in bowl; vibratory feeder bowl coatings; Cadmium compounds; Coatings; Contact resistance; Degradation; Manufacturing; Silver; Steel; Surface contamination; Surface finishing; Surface resistance;
Conference_Titel :
Electrical Contacts, 1991. Proceedings of the Thirty-Seventh IEEE Holm Conference on
Conference_Location :
Chicago, IL, USA
Print_ISBN :
0-7803-0231-1
DOI :
10.1109/HOLM.1991.170832
