Preparation method of aluminum-based boron carbide neutron absorption composite material

Abstract

The invention relates to a preparation method of an aluminum-based boron carbide neutron absorption composite material. The preparation method comprises the following steps of: according to the characteristics of a neutron absorption composite material, grinding, blanking, cold-pressing, baking, hot-pressing raw materials of aluminum powder, silica powder, titanium powder and boron carbide powderby using a powder metallurgic method to prepare the aluminum-based boron carbide neutron absorption composite material in a vacuum state. The tempering quantitative treatment is carried out on the aluminum-based boron carbide neutron absorption composite material so that chemical and physical properties of the aluminum-based boron carbide neutron absorption composite material are more stable. Thepreparation method has the advantages of advanced and reasonable process, continuity and compact, detailed and accurate data, reasonable material proportioning, stable chemical and physical properties and mechanical property and favorable product purity as high as 99.5% and is ideal. Various neutron absorption parts can be prepared by using the aluminum-based boron carbide neutron absorption composite material.

Description

technical field [0001] The invention relates to a method for preparing an aluminum-based boron carbide neutron-absorbing composite material, which belongs to the technical field of nonferrous metal reinforcement and powder metallurgy. Background technique [0002] With the development of science and technology, in aviation, aerospace, electronics, automobiles, communications, military industry, nuclear power plants and other technical fields, the requirements for materials are getting higher and higher. Traditional single-structure materials have been difficult to meet the needs of light weight and high strength. Materials The compounding of metal matrix composites has become an important direction of material development. Due to the characteristics of high specific strength, high specific modulus, excellent wear resistance, dimensional stability, good fatigue resistance, and small thermal expansion coefficient, metal matrix composites have attracted attention. wide attentio...

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Problems solved by technology

[0003] Aluminum is an excellent non-ferrous metal, and boron carbide is a ceramic material; the relative density of boron carbide is 2.52g / cm 3 , with a melting point of 2450°C. Due to its high hardness, low density, and high melting point, it is often used as an abrasive material and has a high neutron capture cross section. Therefore, it can be used as a nuclear shielding material for nuclear power plants, nuclear reactors, aerospace and military fields. , but boron carbide has poor toughness and high brittleness, which also restricts its application. If aluminum, silicon and boron carbide are made into composite materials, the mechanical properties can be improved and the neutron absorption performance can be improved. It is a good technical idea. But it is difficult to synthesize

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