Boron phosphate ceramic material and preparation method thereof

Abstract

The invention relates to a boron phosphate ceramic material and a preparation method thereof. According to the technical scheme, the preparation method comprises the following steps: mixing ammonium dihydrogen phosphate and boric oxide to obtain a mixture I; and carrying out ball milling, drying and mechanical pressing on the mixture I, keeping the temperature at 350-750 DEG C, and conducting crushing to obtain a boron phosphate powder; mixing magnesium oxide, zinc oxide, bismuth oxide and gadolinium oxide to obtain a mixture II; mixing ammonium dihydrogen phosphate and boron oxide according to different mass ratios to obtain a mixture III; mixing the mixture II and the mixture III, conducting mixing with boron phosphate powder, and carrying out ball milling and drying to obtain a zirconium phosphate ceramic powder; and carrying out mechanical pressing on the zirconium phosphate ceramic powder, carrying out cold isostatic pressing treatment, and carrying out heat preservation for 2-5 hours under the conditions of air atmosphere, normal pressure and 900-1200 DEG C to prepare the boron phosphate ceramic material. The preparation method is simple in process, short in production cycle and environment-friendly, and the prepared boron phosphate ceramic material is high in pressure / bending strength, good in thermal expansion performance and excellent in neutron shielding performance.

Description

technical field [0001] The invention belongs to the technical field of ceramic materials. In particular, it relates to a boron phosphate ceramic material and a preparation method thereof. Background technique [0002] With the development of science and technology, the development and utilization of new energy has become one of the strategic goals of sustainable development in my country. As a new type of clean energy with great development potential, nuclear energy has attracted more and more attention from scientific and technological personnel. Due to the large amount of neutron radiation produced in the nuclear reaction process, it will cause great harm to human health and equipment operation. Therefore, using high-efficiency neutron shielding materials to absorb neutron radiation is the best way to ensure the safety of workers and equipment. Therefore, it has become an urgent problem to develop a new process for preparing neutron shielding materials with excellent per...

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Problems solved by technology

[0003] At present, the technologies for preparing neutron shielding materials include: "A lead-boron polyethylene composite material and its preparation method" (CN201710900830.3) patent technology, which discloses a kind of polyethylene, elemental lead powder and elemental boron powder as the main The lead-boron polyethylene radiation shielding material prepared from raw materials, although this technology solves the problems of the existing materials such as large functional particle size, small dispersion and poor interfacial bonding with the polyethylene matrix, it not only contains too much lead, It will cause great harm to the environment and human body, and polyethylene materials have the problem of poor high temperature resistance; "An epoxy resin neutron shielding material and its preparation method and application" (CN201910752009.0) patent technology discloses a A preparation method for preparing neutron shielding materials by mixing various resins and modifying the resins. The method does not contain lead and overcomes the problem of poor heat resistance of polyethylene materials, but the rubber material itself has poor aging resistance. And the mechanical properties cannot meet the requirements of actual engineering; "A preparation method of vacuum pressureless sintered boron carbide shielding material" (CN201711272591.8) patent technology discloses a boron carbide powder, silicon carbide powder and carbon powder as the main The raw material is boron carbide shielding material prepared by vacuum pressureless sintering. Although this material has high neutron shielding efficiency, good high temperature resistance and excellent mechanical properties, boron carbide is usually prepared by high temperature sintering in vacuum or inert atmosphere. The process conditions High temperature requirements are required, and high temperature conditions will consume a lot of energy. At the same time, it is necessary to set up a vacuum or an inert atmosphere to ensure that boron carbide maintains good performance, which further limits the preparation process conditions and increases the difficulty of the preparation process. And B 4 C high melting point and high hardness, pure sintered B 4 C is difficult to shape and expensive