Fabrication of dense B₄C-preceramic polymer derived SiC composite Academic Article

abstract

• 2018 Elsevier Ltd B4C-SiC composites were fabricated via the preceramic polymer (PCP) route combined with pressure-assisted sintering. Fully dense bodies were achieved by controlling surface oxide on B4C powder and pyrolysis conditions for PCP coated powder. We elucidate i) the microstructure and phase developments observed in the process of fabricating dense B4C-PCP derived SiC composites and ii) the mechanical properties and crack deflection behavior of dense bodies. The incorporation of PCP derived SiC to B4C decreases hardness due to the lower hardness value of SiC compared to B4C and the residual carbon accompanied by SiC formation. Instead, the PCP derived SiC improved indentation fracture toughness. The main toughening mechanism supposed is a combination of crack impeding by SiC grains and crack deflection within SiC grains, likely due to the presence of subgrains or layered microstructure in the PCP derived SiC grains.

authors

• Xie, Yu Kelvin

published proceedings

• JOURNAL OF THE EUROPEAN CERAMIC SOCIETY

altmetric score

• 7

author list (cited authors)

• Hwang, C., Yang, Q., Xiang, S., Domnich, V., Khan, A. U., Xie, K. Y., Hemker, K. J., & Haber, R. A.

citation count

• 18

publication date

• April 2019

publisher

• Elsevier  Publisher

keywords

• B4c-sic Composite
• Preceramic Polymer
• Pyrolysis
• Sintering
• Surface Oxide
• TOUGHENING MECHANISM

Digital Object Identifier (DOI)

• 10.1016/j.jeurceramsoc.2018.12.029

start page

• 718

end page

• 725

volume

• 39

issue

• 4

URL

• http://dx.doi.org/10.1016/j.jeurceramsoc.2018.12.029