Synthesis and processing of enhanced boron carbide by rapid carbothermal reduction

Tyler Munhollon, M. Fatih Toksoy, Kanak Kuwelkar, William Rafaniello, Richard Haber

Research output: Contribution to conferencePaperpeer-review

Abstract

The use of rapid heating during carbothermal reduction reaction enables the formation of impurity free, homogenous boron carbide powder. A graphite resistance furnace in the temperature range of 1700 °C to 1900 °C was used to synthesize boron carbide powders. The resulting powders contained small amounts of free carbon (>1 atomic %). Rapid carbothermal reduction allows for control of the boron to carbon ratio. X-ray diffraction studies showed that the powders did not contain any major phases other than boron carbide and no minor impurity phases. Potentiometric titration was used to determine the boron content. Carbon analysis was done using a LECO carbon/sulfur analyzer. Scanning electron microscopy showed the powder was equiaxed and submicron. After the powders were fully characterized, they were sintered using spark plasma sintering. The densified samples achieved full density (>99 % theoretical) and the microstructure showed little exaggerated grain growth. The samples did exhibit a high degree of twinning which is not typically seen in commercial boron carbide. Hardness was measured for each of the samples using a Knoop indenter.

Original languageEnglish (US)
StatePublished - 2014
EventComposites and Advanced Materials Expo: Combined Strength. Unsurpassed Innovation., CAMX 2014 - Orlando, United States
Duration: Oct 13 2014Oct 16 2014

Other

OtherComposites and Advanced Materials Expo: Combined Strength. Unsurpassed Innovation., CAMX 2014
Country/TerritoryUnited States
CityOrlando
Period10/13/1410/16/14

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Aerospace Engineering
  • Materials Science(all)
  • Industrial and Manufacturing Engineering
  • Renewable Energy, Sustainability and the Environment

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