Accession Number:

AD1111508

Title:

Flash Sintering of Boron Carbide (B4C)

Descriptive Note:

[Technical Report, Technical Report]

Corporate Author:

Combat Capabilities Development Command Army Research Laboratory

Report Date:

2020-10-01

Pagination or Media Count:

48

Abstract:

Flash sintering of boron carbide B4C with DC and AC currents across a range of field strengths, temperatures, specimen sizes, and electrodes was investigated. Fully dense B4C was obtained by flash sintering at furnace temperatures as low as 370 deg C, but only in a small portion of the specimen volume due to current localization. Application of an isothermal voltage or current ramp at temperatures of 550 or 1100 deg C prevented current localization, but the resultant lower power density was insufficient to raise the specimen temperature high enough to obtain fully dense specimens. Scalable densification of B4C at low furnace temperatures with flash sintering is hypothesized to be possible with a higher current power supply or by thermally isolating the specimen to reduce energy loss.

Subject Categories:

  • Fabrication Metallurgy
  • Inorganic Chemistry

Distribution Statement:

[A, Approved For Public Release]