A kind of preparation method of neutron absorbing composite material with high neutron absorption rate

Abstract

The invention relates to a preparation method of a neutron-absorbing composite material with a high neutron absorption rate, the steps of which are as follows: (1) weighing 8-40 parts of boron carbide powder, 32-96 parts of aluminum alloy powder and light rare earth in parts by weight 0.1-10 parts of powder; (2) Add boron carbide powder, aluminum alloy powder and light rare earth powder to the powder mixing equipment for mixing; (3) Put the materials evenly mixed by the powder mixing equipment into the vacuum sintering furnace for sintering Obtain the slab; (4) cast a layer of aluminum alloy layer with a thickness of 0.05-1cm on the four side walls of the slab and then mold it; (5) carry out 3-8 passes of hot rolling after the molding. After annealing at 450-500°C, the neutron-absorbing composite material with high neutron absorption rate can be obtained, which ensures the metallurgical quality of the material and ensures that the composite material has excellent mechanical properties, thermal conductivity and neutron absorption capacity.

Description

technical field [0001] The invention relates to a preparation method of a composite material, in particular to a preparation method of a neutron absorption composite material with a high neutron absorption rate. Background technique [0002] Due to the advantages of high efficiency, low consumption, and greenness, nuclear power has become the world's three major power supply pillars alongside thermal power and hydropower; B4C / Al neutron absorbing materials are the dry and wet intensive storage grids and transportation of spent fuel in third-generation power stations in developed countries. The latest material for container reactivity control. [0003] The traditional B4C / Al composite material for neutron absorption adopts box loose rolling process. B4C and Al are uniformly mixed and then loosely packed in the aluminum alloy box. After exhausting, they are directly rolled, and the obtained composite material has a sandwich structure. , In the middle of the upper and lower la...

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Problems solved by technology

[0003] The traditional B4C / Al composite material for neutron absorption adopts box loose rolling process. B4C and Al are uniformly mixed and then loosely packed in the aluminum alloy box. After exhausting, they are directly rolled, and the obtained composite material has a sandwich structure. , in the middle of the upper and lower layers of aluminum plates is still a powder and does not form a continuous composite block. Therefore, the mechanical properties of the product are poor, the thermal conductivity is low, and the neutron absorption capacity is unstable.

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