Patent ID: 6331271
Filing Date: 2001-12-18
Classification: B22F,B30B,Y10S

Abstract:
A method of treating parts by hot-isostatic pressing with an inert gas as pressure medium and in the presence of a purifying agent for the inert gas, wherein the parts are placed in one or more containers which are arranged in a furnace chamber in a pressure chamber, which method comprises the steps of reducing the pressure in the pressure chamber by evacuation of air, increasing the pressure in the pressure chamber by introducing the inert gas via one or more inlets into the pressure chamber, increasing the temperature in the container by activating heating elements in the furnace chamber, maintaining the increased pressure and the increased temperature for a predetermined time, and reducing the pressure and the temperature, wherein while introducing the inert gas, the inert gas is brought to circulate in the furnace chamber, whereby the inert gas and/or the purifying agent is/are heated, the inert gas is brought to pass through the purifying agent and the inert gas, after having passed through the purifying agent, is cooled before contacting the parts in the container.