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A Solvothermal Approach for the Preparation of Nanostructured Carbide and Boride Ultra‐High‐Temperature Ceramics
Author(s) -
Kelly James P.,
Kanakala Raghunath,
Graeve Olivia A.
Publication year - 2010
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.1551-2916.2010.04007.x
Subject(s) - materials science , autoclave , tantalum carbide , ceramic , scanning electron microscope , crystallite , carbide , boride , chemical engineering , particle size , niobium carbide , metallurgy , composite material , engineering
The use of a solvothermal process for the synthesis of tantalum carbide (TaC) and lanthanum hexaboride (LaB 6 ) powders in fused‐quartz test tubes is reported in order to demonstrate the synthesis of these powders using thermal and chemical ignition techniques and to prove that the process is of a self‐propagating high‐temperature synthesis type, obviating the need for an autoclave. X‐ray powder diffraction showed phase pure powders with crystallite sizes of 25 and ∼80 nm, while dynamic light scattering showed average particle sizes of 97 and ∼130 nm, for TaC and LaB 6 , respectively. The data demonstrates that the powders have a very low level of agglomeration. Scanning electron microscopy shows that the TaC powders have a spherical morphology, while the LaB 6 powders have a mixture of cubic and spherical morphologies.