Zirconium diboride/silicon carbide composite material and method for preparing same by means of arc melting in-suit reaction

Abstract

The invention discloses a zirconium diboride / silicon carbide composite material and a method for preparing the same by means of an arc melting in-suit reaction. Raw materials for reaction comprise zirconium powder, carbon boride powder and silicon carbide powder; the dried mixed powder is melted by electric arcs under the protection of argon so that the mixed powder reacts; and then the target material can be formed through solidification and crystallization. The zirconium diboride / silicon carbide composite material prepared by the arc melting in-suit reaction method has a microhardness of 24.0+ / -0.8 GPa and a breaking tenacity of 6.7+ / -0.7 MPa m<1 / 2>; the obdurability of the composite material is obviously higher than that of the zirconium diboride / silicon carbide composite materials prepared by other methods. Furthermore, the melting solidification preparation method employed in the invention is capable of solving the problems of high requirements for initial materials, complex preparation method, low material density and mechanical performance, high cost and the like in the preparation of the ZrB2-based composite material through solid-state sintering.

Description

technical field [0001] The invention relates to the technical field of ceramic materials, and more specifically relates to a high-performance zirconium diboride / silicon carbide composite material and a preparation method thereof. Background technique [0002] Zirconium diboride (ZrB 2 ) is a metalloid structure compound with a hexagonal C32 structure. Because of its high melting point, high hardness, good electrical and thermal conductivity, and good neutron control ability, it is used in high-temperature structural ceramic materials, composite materials, refractory materials, It has been paid attention to and widely used in the fields of electrode materials and nuclear control materials. Many reports have shown that the addition of SiC can improve the oxidation resistance of materials and enhance their mechanical properties. Therefore, people have done a lot of research on the mechanical properties and high temperature properties of zirconium diboride / silicon carbide comp...

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Problems solved by technology

However, studies have shown that the preparation of zirconium diboride / silicon carbide composites by solid-state sintering has the following limitations: 1. Due to the 2 And SiC has a strong covalent bond, the diffusion process in traditional sintering is difficult to carry out, and it is difficult to prepare dense and high-strength zirconium diboride / silicon carbide composite materials; Sintering aids (such as: CoB, Ni 3 B 4 , Y 2 o 3 , ZrO 2 etc.), which will adversely affect the performance of the composite material; three, the traditional method has relatively strict requirements on the raw materials and the process, which makes the preparation process complicated and inefficient, and increases the cost of the preparation material; therefore, the choice of efficient and cheap Preparation of high-performance high-temperature ceramic materials is an important way to solve the bottleneck restricting their large-scale application

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