High-performance boron carbide ceramic nozzle

Abstract

The invention discloses a high-performance boron carbide ceramic nozzle. The high-performance boron carbide ceramic nozzle is prepared from, by weight, 400 to 450 parts of boron carbide, 20 to 25 parts of copper powder, 10 to 12 parts of zinc oxide, 8 to 10 parts of chromic oxide, 3 to 5 parts of nano titanium dioxide, 20 to 25 parts of magnesium oxide, 20 to 25 parts of zirconium oxide, 2 to 5 parts of beryllium carbide, 2 to 5 parts of tungsten carbide, 2 to 5 parts of zirconium boride, 1.2 to 2.4 parts of flint clay, 3 to 6 parts of melilite, 3 to 5 parts of volcanic, 1.2 to 1.5 parts of graphite powder, 0.4 to 0.7 part of starch, 25 to 35 parts of lanthanum oxide, 2.4 to 2.7 parts of mineral fiber, 3 to 4 parts of polyester fiber, and 0.5 to 1.1 parts of titanium carbide fiber. According to a preparation method, a silicon aluminum boron lanthanum compound phase with excellent toughness and wear resistance is formed in sintering, so that the hardness and wear resistance of the high-performance boron carbide ceramic nozzle are improved greatly, defects of conventional ceramic nozzles are avoided, design is reasonable, and popularization value is relatively high.

Description

technical field [0001] The invention relates to the technical field of boron carbide element preparation, in particular to a high-performance boron carbide ceramic nozzle. Background technique [0002] The outstanding advantages of boron carbide are low density, high hardness and large neutron absorption cross-section, and it is mainly used in the form of boron carbide ceramic materials. Boron carbide has a low self-diffusion coefficient due to strong covalent bonding and is difficult to sinter. Densification is usually achieved by hot pressing or hot isostatic pressing sintering. However, on the one hand, hot pressing and hot isostatic pressing can only produce products with relatively small sizes and simple shapes, and on the other hand, the manufacturing costs of hot pressing and hot isostatic pressing are high, which hinders the application of boron carbide materials. [0003] Since ceramic nozzles were introduced into China in the 1990s, the materials have been contin...

AI Technical Summary

Problems solved by technology

[0004] It is believed that one of the reasons hindering the densification of boron carbide ceramics is the boron oxide on the surface of boron carbide powder. The presence of boron oxide will cause the particle coarsening of boron carbide at a lower temperature, resulting in a decrease in the driving force for densification at high temperature.