Carbothermal synthesis of zirconium diboride (ZrB₂) whiskers

Authors: Khanra, A. K.; Pathak, L. C.; Godkhindi, M. M.

Source: Advances in Applied Ceramics, Volume 106, Number 3, June 2007 , pp. 155-160(6)

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Abstract:

In the present investigation, carbothermal synthesis technique is used for the production of ZrB₂ whiskers. The synthesis is carried out by heating the mixture of ZrB₂, H₃BO₃ and carbon black over the temperature range of 1300 to 1700°C in argon atmosphere. Different elements such as Ni, Co and Fe are tested for their role as catalysts. The synthesised powder contains ZrB₂ as the major phase with minor phases of ZrC and B₄C. Whisker yield is found to be low at lower temperatures (<1500°C) and then increases with the pyrolysis temperature. The Ni addition seems more effective as a catalyst than Co or Fe. Shorter length whiskers are found in the case of Co catalyst, whereas use of Fe catalyst shows whisker with rod shape and a special bird's nest type whiskers. The electron microscope study of whisker reveals the presence of various defects.

Keywords: WHISKERS; SEM; ZRB2; CARBOTHERMAL SYNTHESIS; TEM; CATALYST

Document Type: Short Communication

DOI: http://dx.doi.org/10.1179/174367607X162019

Publication date: 2007-06-01

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