Multi-functional nano-porous ceramics

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Ceramics are hard, light-weight, and thermally stable, but are not used in structural applications due to their brittleness. If toughened, ceramics can be an effective alternative to metals that are heavy but used in the high-temperature or armor applications. Ceramic toughening is currently achieved by introducing fiber reinforcements to arrest and/or deflect crack initiation and propagation, or by compositing with ductile phases (metals and polymers). To further improve fracture toughness without compromising thermal stability, we propose a new hierarchical, all-ceramic micro-structure consisting of small-sized grains with “soft” interphase layers, including nano-porosity. Traditionally, pores are considered as defects, but when pores are very small (<~100 nm), the nano-pores deform locally in a non-propagating manner; such local quasi-plastic deformations are expected to improve fracture toughness. Meanwhile, grain sizes are decreased to compensate for the decreased stiffness due to such “soft” interphase layers. In this work, boron carbide is selected as a model system because of their high hardness, low fracture toughness, and effectiveness in shield radiation. Field-assisted sintering technology is selected as a scalable manufacturing method with tunable micro-structures. The fabricated samples are tested for stiffness, hardness, and fracture toughness at room temperature, and studied in relation with their micro-structures.

Original languageEnglish (US)
Title of host publicationSAMPE Conference and Exhibition
EditorsKevin Ahlstrom, Jacob Preston Anderson, Scott Beckwith, Andrew Craig Becnel, Paul Joseph Biermann, Matt Buchholz, Elizabeth Cates, Brian Gardner, Jim Harris, Michael J. Knight, German Reyes-Villanueva, Stephen E. Scarborough, Phil Sears, James Thomas, Erik T. Thostenson
PublisherSoc. for the Advancement of Material and Process Engineering
ISBN (Electronic)9781934551301
Publication statusPublished - Jan 1 2019
EventSAMPE 2019 Conference and Exhibition - Charlotte, United States
Duration: May 20 2019May 23 2019

Publication series

NameInternational SAMPE Technical Conference
Volume2019-May

Conference

ConferenceSAMPE 2019 Conference and Exhibition
CountryUnited States
CityCharlotte
Period5/20/195/23/19

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All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Yamamoto, N., Singh, J., & Dai, J. (2019). Multi-functional nano-porous ceramics. In K. Ahlstrom, J. P. Anderson, S. Beckwith, A. C. Becnel, P. J. Biermann, M. Buchholz, E. Cates, B. Gardner, J. Harris, M. J. Knight, G. Reyes-Villanueva, S. E. Scarborough, P. Sears, J. Thomas, ... E. T. Thostenson (Eds.), SAMPE Conference and Exhibition (International SAMPE Technical Conference; Vol. 2019-May). Soc. for the Advancement of Material and Process Engineering.