A New Sight on the Influence of Molten Salt in the Preparation of (Ta, Nb, Ti) C Nanopowder

Abstract

The molten salt method is an effective approach for obtaining multi‐component carbide nano‐powders at low temperatures. However, the presence of impurities limits its application in the lower‐temperature domains. To address this issue, (Ta, Nb, Ti) C nano‐powders are fabricated by the molten salt method at 1100‐1400°C and the dual route synthesis mechanism is revealed. Results indicate that the synthesis temperature of pure (Ta, Nb, Ti) C nano‐powders can be decreased with the addition of molten salt, which is determined by the formation and decomposition of the intermediates. During the synthesis process, the molten salt can provide liquid‐phase environment for the combination reaction between metal powders and carbon, facilitating the formation of homogeneous and nano‐sized powders. Meanwhile, the molten salt reacts with impurities to generate intermediates including KTaO3 and K1.04Ti8O16 at low temperatures, which subsequently form carbides through thermal reduction. This transformation can decrease the energy barrier of the synthesis process.This article is protected by copyright. All rights reserved.