Integrated precision molding method for metal iridium ventilation window assembly

Abstract

An integrated precision molding method for a metal iridium ventilation window assembly combines precision graphite die design, powder filling amount calculation and a powder metallurgy technology, that is, firstly, the shape and the size of a filler area in a precision graphite die and the powder filling amount of iridium powder are determined through the air permeability of the metal iridium ventilation window assembly; and then temperature intervals and hot-pressing parameters of hot-pressing molding and diffusion welding are determined, so that hot-pressing sintering and diffusion welding integrated molding of the ventilating window assembly which is tight in combination, high in dimensional precision and capable of meeting the service requirement of the ventilating performance is achieved. A porous iridium ventilation sheet and a hollowed-out metal iridium window body chassis in the obtained metal iridium ventilation window assembly are tightly combined, the size precision is high, the technological process is efficient, and the specific process comprises precise graphite die design, powder filling amount calculation of the iridium powder, iridium ventilation sheet vacuum hot-pressing molding and preliminary diffusion welding of the metal iridium ventilation window assembly, and the low-temperature diffusion welding of the metal iridium ventilation window assembly is suitable for integrated precision molding of the metal iridium ventilation window assembly for a nuclear battery.

Description

technical field [0001] The invention relates to the fields of metal powder metallurgy and metal welding, in particular to an integrated precision forming method of hot pressing forming and diffusion welding of a metal iridium ventilation window assembly. Background technique [0002] During the service of nuclear batteries, helium gas is produced with the decay of atoms, and the accumulation of helium in the battery will significantly increase the risk of battery explosion, so the ventilation window exhausts slowly (the air permeability meets the pressure of 7kPa, and the air flow rate is 0.07-0.12cm 3 / s) has become an indispensable key link in the service process of nuclear batteries. The metal iridium ventilation window assembly includes key components such as an iridium window chassis with a hollow window, a porous iridium ventilation sheet, etc., and has a complex structure, wherein the iridium window chassis is a dense structure, and the iridium ventilation sheet is a ...

AI Technical Summary

Problems solved by technology

Moreover, the overall size of the breathable window assembly is small and the precision is high, which makes it more difficult to process and shape

The current research on the forming and processing of metal iridium ventilation window components with complex structures has not been reported yet, and the processing technology of ordinary precious metals is too cumbersome, and the harsh experimental conditions also impose strict requirements on the equipment, thus limiting the dimensional accuracy of iridium ventilation windows. and further developments in air permeability

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