Abstract
ABSTRACT The process of induction brazing of diamond-carbide cutters with various silver solders and fluxes with different proportions of active substances is considered in this paper. The influence of heating during brazing on the thermal stability of polycrystalline diamond is also investigated. A methodology for testing brazed cutters is developed and the results of the wear dependence from the applied solders and the soldering mode are obtained. It is established that at hold-up time at temperature over 800°C for more than 1 min takes place destruction of the diamond plate. Due to the significant alloying of silver solders with manganese and nickel, a dependence of the solder wetting of the diamond-hard alloy cutters (DHAC) carbide substrate surface from the composition of the fluoroborate flux is found. The best results are obtained when using PV209 or PV209X flux, which have a minimum F/B ratio, i.e. with lower fluorine content. When choosing solders, preference should be given to alloys based on silver with a melting point no higher than 700°C, alloyed with manganese and nickel. It is possible to reduce the silver content in solders from 49 to 38 wt % while maintaining high properties of the brazed joints.
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