ChemInform Abstract: Carbothermal Synthesis of Binary (MX) and Ternary (M1,M2X) Carbides, Nitrides, and Borides from Polymeric Precursors.

Abstract

Carbothermal Synthesis of Binary (MX) and Ternary (M1,M2X) Carbides, Nitrides, and Borides from Polymeric Precursors.-Polymeric precursors which have been synthesized by reaction of metal alkoxides with polyhydric and monohydric alcohols are coked by heating in an inert atmosphere to undergo carbothermal reduction at temperatures in the range 1000-1650 • C. The resulting ceramic phases like AlN, TiB2 etc. are characterized by powder X-ray diffraction measurements. The results show that the redidual oxygen and carbon could be kept to a minimum (0.2-0.5%). -(STANLEY, D. R.; BIRCHALL, J. D.; HYLAND, J. N. K.; THOMAS, L.; HODGETTS, K.; J. Mater. Chem. 2 (1992) 2, 149-156; ICI Adv. Mat., Runcorn, Cheshire WA7 4QE, UK; EN)

Titanium Carbide: Synthesis, Properties and Applications

“…Stanley et al (1992) [52] synthesized binary and ternary carbides by using the reaction of titanium tetra-isopropoxide with glycerol and furfuryl alcohol. The latter being used to control the oxide/carbon stoichiometry in the subsequent coke.…”

Solution‐Based Synthesis of Submicrometer ZrB2 and ZrB2–TaB2

“…Common soluble metal/metal oxide‐bearing materials are metal alkoxides, metal diketonates, and metal carboxylates. Metal‐organic compounds are usually subjected to hydrolysis and condensation reactions to produce polymeric or colloidal metal‐oxide precursors 21–37 . Depending on the reaction conditions, the metal‐organic compound may also be a source for some of the carbon for the carbothermal reduction reaction.…”

Conversion of Alumina to Aluminum Nitride Using Polymeric Carbon Nitride as a Nitridation Reagent

“…The intimate mixing leads to improved reaction kinetics, resulting in a lower nitridation temperature. The nitridation temperature (1400°C to 1500°C) is at least 200°C lower than that in the conventional CRN method . An intimate mixture of Al 2 O 3 and carbon powders can be also obtained by the thermal decomposition of Al(III) salts mixed with organic compounds in aqueous solution .…”

“…Various synthesis methods, that do not require the mixing of Al 2 O 3 with carbon, have been developed to solve the drawback. One of them is the modified CRN method, in which Al(III) complexes are used as the precursor . These complexes are prepared from the reaction between Al(III) and organic compounds in aqueous solution, and are thermally decomposed into an intimate mixture of Al 2 O 3 and carbon powders at the molecular level.…”