Patent ID: 7267793
Filing Date: 2007-09-11
Classification: C21D,C23C

Abstract:
1. A vacuum furnace for carburizing ferrous workpieces therein comprising: a furnace casing defining a furnace chamber proper therein; a heater within the furnace chamber; a vacuum pump in fluid communication with the furnace chamber; at least one injector of the pulse operating type, the injector having an inlet in fluid communication with a source of liquid carburizing hydrocarbon under pressure and an outlet; a hydrogenation coil having an inlet in fluid communication with the injector outlet and an outlet in fluid communication with the furnace chamber; a hydrogen supply device configured to supply a set quantity of hydrogen to the hydrogenation coil; and, a controller for controlling: i) the heater for regulating the temperature of the workpiece in the furnace chamber, ii) the vacuum pump valve for regulating the pressure of the furnace chamber, iii) the injector for regulating the pulsing of the injector; and, iv) the hydrogen supply device for regulating the quantity of hydrogen gas supplied to the hydrogenation coil.