Transactions of Nanjing University of Aeronautics & Astronautics
BONDING INTERFACE AND WEAR BEHAVIOR OF CBN GRAINS BRAZED USING NANOTiC POWDER MODIFIED FILLER
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Abstract:
A new kind of composite fillers, composed of AgCuTi alloy and nanoTi C powders, is utilized to braze cubic boron nitride (CBN) grains and tool substr ate. The bonding system, including the interfacial microstructure and reactive p roducts between CBN grains and filler layer, is observed by optical microscope a nd scanning electron microscope (SEM). Resistanttowear experiments of the br azed grains are performed. Results show that the nanoTiC powders evenly di stribute in the filler layer so that the resultants grow compactly and uniformly on the surface of CBN grain. This indicates that the chemical bond is established between CBN grains and nanoTiC modified filler. Accordingly, the bonding strength of the g rains is ensured. The CBN grains are worn smoothly without grain pullout.
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