Small amount TiB2 addition into B4C through sputter deposition and hot pressing

Chawon Hwang, Stephen DiPietro, Kelvin Y. Xie, Qirong Yang, Azmi M. Celik, Atta U. Khan, Vladislav Domnich, Scott Walck, Kevin J. Hemker, Richard A. Haber

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Small amount of TiB2 (<5 wt%) was added into B4C through a novel method that combines the use of sputter deposition and hot pressing. Sputter deposition provided more uniform dispersion of TiB2 grains with smaller grain sizes as compared to the conventional particulate mixing. Small amount TiB2 addition demonstrated to be an effective way for improving the fracture behavior and toughness of B4C while not sacrificing its outstanding lightweight property to a large extent: 2.3 wt% TiB2 addition brought 15% improvement in indentation fracture toughness while resulting in less than 2% increase in density. The improvement can be attributed to the combination of crack impeding by TiB2 grains and crack deflection at the B4C–TiB2 interfaces. TiB2 also played as grain growth inhibitor resulting in a slight increase (2%) in Vickers hardness. Another intention of employing sputter deposition was to modify the grain boundary of B4C; however, neither formation of Ti-containing phase nor Ti segregation has been observed at grain boundaries likely due to the poor wettability of B4C.

Original languageEnglish (US)
Pages (from-to)4421-4426
Number of pages6
JournalJournal of the American Ceramic Society
Volume102
Issue number8
DOIs
StatePublished - Aug 2019

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

Keywords

  • boron carbide
  • hot pressing
  • small amount addition
  • sputter deposition
  • titanium diboride

Fingerprint Dive into the research topics of 'Small amount TiB<sub>2</sub> addition into B<sub>4</sub>C through sputter deposition and hot pressing'. Together they form a unique fingerprint.

Cite this