Preparation method of high-temperature structure-function combining B4C/Al neutron absorbing material

Abstract

The invention relates to a preparation method of a high-temperature structure-function combining B4C / Al neutron absorbing material. The preparation method comprises the concrete steps of (1) adopting a high energy ball milling method for ball-milling aluminum powder into flake aluminum powder; (2) placing the flake aluminum powder into an air furnace for pre-oxidizing, and forming a layer of nanometer aluminum oxide film on the surface of the aluminum powder; (3) uniformly mixing the pre-oxidized flake aluminum powder and micron-sized B4C particles; (4) pressing molding the uniformly mixed powder; (5) conducting pressureless sintering or hot pressed sintering on a pressing-molded pressing blank; and (6) forging, extruding or rolling a sintered billet so as to obtain the high-temperature structure-function combining B4C / Al neutron absorbing sectional material or sheet material. By adopting the method, a certain amount of nanometer aluminum oxide can be introduced into a pure aluminum matrix, and the micron-sized B4C particles are added, so that the aluminum-based neutron absorbing material with two-phase reinforcement of micron B4C and nano Al2O3 can be prepared, has both a neutron absorbing performance and an excellent high-temperature mechanical property, and can be applied in the fields of spent fuel dry storage, transportation and the like.

Description

technical field [0001] The invention belongs to the field of preparation of aluminum-based neutron absorbing materials, and specifically provides a high-temperature structure-function integrated B 4 The preparation method of C / Al neutron absorbing material. The material can be used to manufacture grids for spent fuel dry storage and transport containers. Background technique [0002] The nuclear fuel used in nuclear power plants is generally called spent fuel. According to statistics, a one-million-kilowatt nuclear power unit discharges about 20 tons of spent fuel every year. With the rapid development of the global nuclear power industry, the number of nuclear power units under construction and in operation is gradually increasing. An important problem brought about by this is the storage or disposal of highly radioactive spent fuel extracted from the core has become increasingly prominent. [0003] Due to the difficulty and high cost of spent fuel reprocessing, most coun...

AI Technical Summary

Problems solved by technology

[0007] The object of the present invention is to provide a high-temperature structure-function integrated B 4 The preparation method of C / Al neutron absorbing material solves the existing traditional B 4 Due to the poor mechanical properties of C / Al neutron absorbing material at high temperature, it can only be used in the stainless steel skeleton when used. It is suitable for the manufacture of spent fuel dry storage, transport container grids and other fields.