A pressureless solid phase sintered boron carbide helmet and its preparation method

Abstract

The invention relates to a pressure-free solid-phase sintering boron carbide helmet and a preparation method thereof. The boron carbide helmet is mainly prepared from, by mass, 70-90% of boron carbide micropowder, 0.5-2.0% of carbon black, 5-20% of acrylamide (AM), 2-10% of crosslinking agent, 0.2-1% of defoamer, 0.5-2.0% of initiator and 0.5-2.0% of dispersant through preparing of boron carbide size, defoaming, gel casting, drying, secondary drying and sintering, and density of the prepared boron carbide helmet is 2.40-2.50g / cm3. The boron carbide helmet has the advantages of light weight, high compactness and high bulletproof performance, the preparation method is simple, efficient, low in cost and high in yield, and the boron carbide helmet is supportive of continuous production.

Description

technical field [0001] The invention relates to a pressureless solid-phase sintered boron carbide helmet and a preparation method thereof, belonging to the technical field of ceramic preparation. Background technique [0002] Bulletproof helmets are commonly used body protection equipment for special personnel such as soldiers, policemen, and security guards. Therefore, it is of great significance to manufacture bulletproof helmets with good bulletproof performance and comfortable wearing to protect commanders and fighters. [0003] With the development of science and technology, the lethality of weapons has also been greatly improved. Rigid, polymer or ordinary ceramic bulletproof materials can no longer meet the requirements. It is urgent to seek new high-performance bulletproof materials. [0004] Boron carbide ceramics have a low density (2.52g / cm 3 ), high melting point (2450°C), high hardness (second only to diamond and cubic boron nitride), and good thermal neutron a...

AI Technical Summary

Problems solved by technology

For example, Chinese patent document CN103979972 A discloses a hot-pressed sintered boron carbide bulletproof material and its preparation method. The material includes the following components: boron carbide, TiO 2 , α-SiC and carbon black; although the performance of the boron carbide material obtained by this method is better, the hot pressing sintering equipment is complex, the production efficiency is low, the production cost is high, and only products with simple shapes can be produced

Chinese patent document CN 203657619U discloses a boron carbide-silicon carbide composite ceramic bulletproof helmet body formed by integral grouting. The invention adopts integral molding of grouting to prepare a boron carbide ceramic helmet, but the helmet prepared by this method has low density and low bulletproof performance. Difference

As another example, Chinese patent document CN103979971 A discloses a liquid-phase sintered boron carbide bulletproof material and a preparation method thereof. The material includes the following components: boron carbide, α-Si 3 N 4 , α-SiC, carbon black, Al-Y additives; among them, the Al-Y additives are Y 2 o 3 and Al 2 o 3 The mixture of these two substances is a low-melting, highly volatile substance, which is easy to form SiO on the surface of boron carbide particles. 2 , forming SiO 2 -Y 2 o 3 -Al 2 o 3 system, the liquid phase appears prematurely, and when the temperature is high, it volatilizes strongly and causes weight loss, which is unfavorable for the densification of the material