Preparation and Characterization of Al₂O₃-B₄C Coated Composite Powder by Hydrothermal Method

Abstract

Both alumina and boron carbide have good hardness and strength, and are widely used in production and life, industrial manufacturing, and military defense. However, due to the insufficiency of research at this stage and the lack of technical means, it is difficult to prepare alumina-boron carbide composite powder with good coating and ultra high strength through large-scale batch production. Therefore, this experiment wants to obtain a relatively good performance of coated Al2O3/B4C cermet by hydrothermal method through different experimental parameter ratios. Through the experimental results and analysis, the following conclusions are obtained. The most suitable concentration of aluminum nitrate is 0.1 mol/l. The low concentration affects the formation of alumina particles. The concentration is too high and prone to agglomeration. Through the optimization of hydrothermal synthesis concentration, a composite of Al2O3/B4C composite with good nanoencapsulated structure was obtained. The composite powder was pure in composition and high in specific surface area, which lays a foundation for solving the low-temperature preparation of high-density boron carbide ceramics.

Effect of Raw Materials on Properties of Coated Al₂O₃-Al Cermet Materials via Vacuum Sintering Method

“…Whisker fiber reinforcement. Aluminum is added to alumina ceramic granules and fiber technology is not very skilled and cannot be produced on a large scale [10][11][12].…”