Method for controlling temperature of hot isobaric press and hot isobaric press

Abstract

A method for controlling the temperature of a hot isobaric press comprising a pressure vessel (1) having a charging zone (19) located inside and being arranged between the charging zone and the pressure vessel The heat insulator (8) between them, wherein, the heating element (4) and the charging area (19) with the charging device (18) are arranged in the heat insulator (8). Therein, in addition to at least one existing natural or activated convection for heating or cooling or for maintaining the temperature level, at least one swirl (23) is actively or passively formed in the pressure vessel (1). An independent or also suitable hot isobaric press for this method is characterized in that in the pressure vessel (1) there are arranged active or passive means for forming a swirl (23) which occurs essentially at an angle to the convection device.

Description

technical field [0001] The invention relates to a method of controlling the temperature of a hot isobaric press according to the preamble of claim 1 and a hot isobaric press according to the preamble of claim 10 . Background technique [0002] Hot isobaric presses (HIP) or high pressure boilers are used today in a wide range of applications. In this case, a solid workpiece or molding material consisting of powder is densified in a mold under high temperature and pressure conditions. In this case, materials of the same kind, but also different materials, can be combined with each other. Typically, the workpiece is placed in a furnace with heating means surrounded by a high pressure vessel. During or after heating, a fully isobaric pressure treatment is carried out by pressure in all directions of a fluid or an inert gas (usually argon) until the workpiece reaches optimum densification. This method is also used for redensification of components made of, for example, ceramic...

AI Technical Summary

Problems solved by technology

However, in pressure vessel systems, the heating element acts at the outer surface of the charge zone and thus cannot completely prevent separation inside the charge zone

In the embodiment according to WO 2003 / 070 402 A1, an active convective flow through the charging zone is used in a targeted manner, wherein in the holding phase, for example between a heating phase and a cooling phase or during a step-like change in temperature, due to The required heating power is consequently reduced, so that the convective flow virtually stops and therefore the desired effect can no longer be achieved during the holding phase

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