Production of Ag-C Mixtures by Carbonization of Resin and Its Characteristics for Electrical Contact

Abstract

The switching and sliding characteristics of Ag-C mixtures produced by carbonization of several resins such as vinyle, furan and phenol have been measured. The results obtained are as follows:
(1) The carbonized Ag-C mixtures have high resistance to erosion for switching and sliding contacts. Particularly, the Ag-C mixture produced by carbonization of vinyle chloride resin has excellent resistance to erosion and stability, the amount of erosion is one-fifth and one-tenth that of the sintered Ag-graphite mixture for switching contact and for sliding contact respectively. This may be due to the presence of AgCl which is produced by the reaction of decomposed chlorine and silver.
(2) The hardness of the carbonized Ag-C mixtures is higher than that of sintered Ag-graphite mixtures. The carbon is homogeneously dispersed and the rate of crystallization of the carbon depends on the carbonization temperature.