Preparation method of copper-based neutron absorbing material

Abstract

The invention discloses a preparation method of a copper-based neutron absorbing material. Specifically, the spark plasma sintering technique is used for applying pulse currents to mixed powder materials, so that joule heat and point discharge plasma are generated between particles, and the particles are made to melt locally to be connected in a metallurgical bonding mode; and the chemical materials used in the preparation process mainly include copper powder, boron carbide powder, absolute ethyl alcohol, hydrochloric acid, hydrofluoric acid, deionized water, graphite paper, sand paper and diamond paste. The preparation method comprises the steps of pretreatment of the copper powder, pretreatment of the boron carbide powder, weighing of the raw materials, ball milling of mixed materials, filling of powder, prepressing of a mold, spark plasma sintering for preparation, cleaning of the surface of a sample, detection and analysis of the sample and the like. The compactness of the prepared copper-based neutron absorbing material can reach 99% or over, the boron carbide in the copper-based neutron absorbing material is distributed in a dispersed mode, the bending strength can reach 350+/-5 MPa, and the neutron absorbing performance can reach 98%.

Description

technical field [0001] The content of the invention is a preparation method of a copper-based neutron absorbing material, which belongs to the technical field of material processing, preparation and application. Background technique [0002] Neutron absorbing materials are widely used in the nuclear industry. At present, the commonly used neutron absorbing materials are mainly metals, nonmetals, and their compounds with high thermal neutron and epithermal neutron absorption cross-sections, such as commonly used elements boron, cadmium, silver etc. Silver is often not used as a neutron absorbing material because of its high price, but is often used as a control rod. Although cadmium has excellent neutron absorption performance, it has been gradually eliminated in recent decades due to its small reserves, high price and toxicity. Boron is an element with abundant reserves in nature. Natural boron has two stable isotopes B 10 and B 11 , boron element has neutron absorption ...

AI Technical Summary

Problems solved by technology

Aluminum-based boron carbide materials cannot withstand high temperatures and some corrosive environments because their substrates are aluminum and aluminum alloys; although boron steel has a high heat-resistant temperature, due to the low solid solubility of boron in steel, and the iron-boron phase ( Fe 2 B, FeB) will precipitate on the ferrite grain boundary, which will significantly reduce the processing performance and mechanical properties of the matrix

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