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Synthesis of Ti 3 SiC 2 Powders: Reaction Mechanism
Author(s) -
Córdoba José M.,
Sayagués María J.,
Alcalá María D.,
Gotor Francisco J.
Publication year - 2007
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2007.01501.x
Subject(s) - materials science , silicon carbide , silicon , titanium , inert , carbon fibers , diffusion , isothermal process , inert gas , chemical engineering , carbide , titanium carbide , reagent , composite number , metallurgy , composite material , chemistry , thermodynamics , physics , organic chemistry , engineering
Titanium silicon carbide (Ti 3 SiC 2 ) and Ti 3 SiC 2 ‐based composite powders were synthesized by isothermal treatment in an inert atmosphere as a function of initial compositions (mixtures). A high content of TiC was obtained in the final product when the initial mixtures contained free carbon. The use of TiC as a reagent was unsuccessful in obtaining Ti 3 SiC 2 . High Ti 3 SiC 2 conversion was found for the initial mixtures containing SiC as the main source for silicon and carbon. An initial mixture with a large excess of silicon, 3Ti/1.5SiC/0.5C, was needed to obtain high‐purity Ti 3 SiC 2 . A reaction mechanism, where Ti 3 SiC 2 nucleates on Ti 5 Si 3 C crystals and grows by long‐range diffusion of Ti and C, is proposed. The reaction mechanism was proposed to be based on silicon loss during the formation of Ti 3 SiC 2 .