Process for preparing large-specification tungsten plate billet by means of resistance sintering

Abstract

The invention discloses a process for preparing a large-specification tungsten plate billet by means of resistance sintering. The process includes the steps: firstly, taking tungsten powder of needed amount; secondly, selecting a rubber sleeve or a steel sleeve according to the specification of a pre-produced tungsten plate billet, compactly and uniformly filling the tungsten powder of the needed amount into the rubber sleeve or the steel sleeve, and then sealing the rubber sleeve or the steel sleeve; thirdly, performing isostatic pressing (at 180MPa); fourthly, releasing pressure and demoulding; and fifthly, sintering the pre-produced tungsten plate billet by means of resistance sintering. The resistance sintering temperature is lower than traditional vertical sintering temperature, temperature rises slowly, and a temperature field is uniform, so that the texture and the performance of the large-specification tungsten plate billet can be improved. Yield is high, energy consumption is low, economic benefits are high, corner and edge chipping of products in subsequent machining of a traditional process is eliminated, fine machining performance is achieved, and the number of pores at a grain boundary is relatively decreased. The process is simple, convenient, easy to implement and suitable for popularization and use in tungsten plate billet preparation.

Description

technical field [0001] The invention relates to a process for preparing large-scale tungsten slabs by adopting a resistance sintering method. Background technique [0002] The sintering method is used to prepare tungsten slabs. In the traditional technology, vertical melting sintering or intermediate frequency induction sintering are mostly used, but these two sintering methods have certain shortcomings: (1) vertical melting sintering: ①, the temperature at the upper and lower ends is biased Low, large temperature gradient, poor consistency of sintered density; ②, poor heat insulation and sealing, resulting in large power consumption, hydrogen consumption, high sintering cost; ③, vertical welding strips need to cut off the chuck parts at both ends (about 4%) , the finished product rate is reduced; ④, due to the limitation of the vertical furnace cover, generally only products with a small unit weight can be sintered. (2) Intermediate frequency induction sintering: The prepa...

AI Technical Summary

Problems solved by technology

[0002]The sintering method is used to prepare tungsten slabs. In the traditional technology, vertical melting sintering or intermediate frequency induction sintering are mostly used, but these two sintering methods have certain shortcomings: ( 1) Vertical melting sintering: ①, the temperature at the upper and lower ends is low, the temperature gradient is large, and the sintering density consistency is poor; ②, the heat insulation and sealing are poor, which makes the power consumption and hydrogen consumption large, and the sintering cost is high; ③, the vertical It is necessary to cut off the chuck parts (about 4%) at both ends of the melting rod, and the finished product rate is reduced; ④, due to the limitation of the vertical furnace cover, generally only products with a small unit weight can be sintered

(2) Intermediate frequency induction sintering: The prepared tungsten slab has a large number of pores, which are distributed inside the tungsten grains and at the grain boundaries. In addition, there are a small number of large-sized pores, which cause corner drop and edge drop during subsequent deep processing.

Images