High-quantity hafnium rod manufacturing method

Abstract

The invention discloses a high-quantity hafnium rod manufacturing method. The method includes the steps that a hafnium rod blank is wrapped with a steel pipe, then the steel pipe is wrapped with a copper pipe, and the double-wrapped hafnium rod blank is obtained; secondly, the double-wrapped hafnium rod blank is extruded after the rod blank is heated and the temperature is kept, and the extruded rod blank is obtained; thirdly, the copper pipe and the steel pipe wrapping the extruded rod blank are removed, and then the extruded rod blank is subjected to vacuum annealing treatment; fourthly, under the condition that the extruded rod blank is heated continuously in the atmosphere, the extruded rod blank is rolled through a heat pipe rolling machine; fifthly, oxide coatings are removed, then the extruded rod blank is straightened, ground and polished in sequence, and a semi-finished hafnium rod is obtained; and sixthly, vacuum annealing treatment is conducted, and a finished high-quality hafnium rod is obtained. By the high-quantity hafnium rod manufacturing method, the hafnium rod blank is double-wrapped before being extruded, and the hafnium rod blank is rolled through the heat pipe rolling machine under the condition that the extruded rod blank is heated continuously in the atmosphere, and the hafnium rod with the dimensional deviation ranging from -0.02 mm to 0.02 mm, the ovality smaller than or equal to 0.02 mm and excellent mechanical property and corrosion resistance and of an even structure can be obtained.

Description

technical field

[0001] The invention belongs to the technical field of hafnium material processing and preparation, and in particular relates to a method for preparing high-quality hafnium rods. Background technique

[0002] Metal hafnium has good thermal neutron and epithermal neutron absorption capacity, and its thermal neutron absorption cross section can reach 115b (1b=10 -28 m 2 ), which is 600 times that of zirconium. At the same time, metal hafnium also exhibits excellent mechanical properties and corrosion properties, so it is an ideal nuclear reactor control material.

[0003] With the continuous improvement of the requirements for nuclear control materials, designers and users have put forward higher requirements for hafnium control materials, including high-temperature mechanical properties, corrosion properties and surface quality, etc., to ensure long-term stable service of hafnium materials at high temperatures , high pressure, and nuclear radiation conditio...

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