Pressureless sintered boron carbide bulletproof ceramic and preparation method thereof

Abstract

The invention relates to the technical field of composite material ceramic preparation, in particular to pressureless sintered boron carbide bulletproof ceramic and a preparation method thereof. The pressureless sintered boron carbide bulletproof ceramic comprises the following components in parts by weight: 95-99 parts of carbide, 1.5-3.5 parts of a sintering aid, 10-20 parts of resin and 0.1-0.5 part of a dispersing agent, By adopting a pressureless sintering process and adopting self-made silicon carbide balls as a grinding medium, pollution-free grinding is realized, and the difficulty of powder purification is reduced; by adopting an atomization granulation formula and an atomization granulation process, the technical indexes of granulated powder meet the technical requirements of imported products of the same kind; a novel forming die is used, so the size of a pressed blank meets the precision requirement of a sintered and shrunk product; and the product quality and yield of the boron carbide ceramic can be improved, and the prepared boron carbide bulletproof ceramic is good in toughness and high in strength.

Description

technical field [0001] The invention relates to the technical field of composite ceramic preparation, in particular to a pressureless sintered boron carbide bulletproof ceramic and a preparation method thereof. Background technique [0002] Bulletproof ceramics are widely used in the safety protection of military equipment and special operations such as coal and mines. In modern large-scale wars and the struggle against violence and terrorism, how to resist the damage of guns, cannons and missiles to military equipment and personnel is also very important. The application of bulletproof ceramics plays a key role in reducing casualties, improving combat effectiveness, and increasing victory factors. [0003] The core component of ceramic matrix composite bulletproof materials is bulletproof ceramics. Among the various bulletproof ceramics currently available, boron carbide, (B 4 C) Ceramics have the lightest specific gravity, highest hardness and modulus of elasticity, and ...

AI Technical Summary

Problems solved by technology

B 4 The melting point of C is as high as 2350 ° C, the plasticity is poor, and the grain boundary movement resistance is very large, so B 4 The preparation of C ceramics is relatively difficult. At present, B 4 The preparation of C ceramics mainly includes three processes: hot pressing sintering, pressureless sintering, and reaction sintering. Hot pressing sintering requires fine powder with a particle size of ≤3.5 microns, and the process cost is extremely high. Pressureless sintering requires ultrafine powder with a particle size of ≤1 micron. , the sintering temperature is higher, the current reaction sintering B 4 The C process adopts the vacuum siliconizing method. In the production process of this process, the solid phase of boron carbide is greatly lost due to the reaction of liquid phase silicon, which weakens the advantages of boron carbide materials; therefore, choose a suitable process to improve the products of boron carbide ceramics Quality and yield, the preparation of boron carbide bulletproof ceramics with excellent performance, and the reduction of its production cost are the problems that need to be solved at present

Images