Skip to main content
padlock icon - secure page this page is secure

Hafnium Reactivity with Boron and Carbon Sources Under Non-Self-Propagating High-Temperature Synthesis Conditions

Buy Article:

$52.00 + tax (Refund Policy)

The homogeneous and heterogeneous reactions of hafnium (Hf) with boron (B) or carbon (C) powders were studied under non-self-propagating high-temperature synthesis (SHS) conditions in searching for chemically aided processes of ultra-high-temperature ceramics at mild and practical conditions. The threshold interactions of the Hf/B and Hf/C powder mixtures consisting of relatively large Hf particles occur at 700° and 800°C, respectively, with no observation of particle melting as previously postulated for igniting SHS reactions. A microscale melting phenomenon at the Hf surface was observed by scanning electron microscopy analysis in heterogeneous reactions between Hf metal strips and B or C powders at the temperature range of 1100°–1200°C, more than 1000°C below the incipient melting point of the metal. The non-SHS conditions allow halting the reactions at intermediate stages for analytical purposes. Kinetic studies of the homogeneous and heterogeneous reactions, heat transfer model analyses, and their association with the investigation of microstructural phenomena were used to postulate the mechanism involved in the observed reactions.
No References
No Citations
No Supplementary Data
No Article Media
No Metrics

Document Type: Research Article

Affiliations: SRI International, Menlo Park, California 94025

Publication date: May 1, 2008

  • Access Key
  • Free content
  • Partial Free content
  • New content
  • Open access content
  • Partial Open access content
  • Subscribed content
  • Partial Subscribed content
  • Free trial content
Cookie Policy
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more