Synthesis Of NdB₆ And Fabrication Technique Of In Situ (TiB+TiC+Nd₂O₃)/Ti Composites By Powder Metallurgy

Recently, titanium matrix composites (TMCs) attracted more and more attention and are considered technically superior and cost-effective owning to their high strength and elastic module compared to their weight, especially their good mechanical properties at elevated temperature and wide potential application in the field of aviation and aerospace. A novel method to prepare particulate-reinforced TMCs has been developed—in situ technology where the reinforcements are synthesized in metallic matrices by chemical reactions between elements or between elements and compound during the fabrication, which eliminates the incompatibility on interface between matrix and reinforcement based on their nucleation and growth from parent matrix phase. Compared to conventional TMCs, in situ method has attracted much more attention due to their ease of fabrication and low cost as well as high mechanical properties.For developing particulate reinforced TMCs, it's very important to use compatible reinforcements. Many reinforcements are used in TMCs, including SiC, Al₂O₃, TiC, TiB, TiB₂ and rare earth oxide. In this paper, NdB6 and B4C were chosen to be raw materials to structure the reinforcements. However, we were facing another question, where could we get the pure NdB₆ which was not available in Chinese market. After do a large amount of studies on the production of NdB₆ and YB₆ powder, the decision of synthesizing NdB6 powder by ourselves was finally made. The main results of this paper can be described as follow:1. After a series of pretreatments, NdB6 powders are fabricated from...