PROCESS OF CENTRIFUGAL HARD-FACING Russian patent published in 1999 - IPC

FIELD: hard-facing of internal surfaces of cylindrical parts predominantly such as bushings and plain bearings. SUBSTANCE: powdery exothermic mixture with addition of alloying components and primer are put inside part. Primer is composed of substance or mixture of substances compacted in briquette that ignites with friction. Briquette has shape of ball, polyhedron or ball with tongues. Mixture is ignited after part starts rotating. Rotation is stopped when hard-faced layer hardens. EFFECT: reduced labor input and energy consumption, expanded functional capabilities of process, possibility of hard-facing of parts with small inner diameter. 2 cl, 1 dwg