Investigation of the Lanthanide Sesquioxides as High Temperature Transformation Toughening Agents

The lanthanide sesquioxides were investigated as possible high temperature transformation toughening agents. Specifically, the monoclinic to cubic (B $\Rightarrow$ C) transformation in Gd$\sb2$O$\sb3$ and Tb$\sb2$O$\sb3$ was examined. This transformation involves an 8-10% volume expansion and a shape change (\Deltaβ) of $\sim$10$\sp\circ$. Techniques used in the investigation of the transformation behavior included: grinding, cooling in liquid nitrogen, DTA, dilatometry, ambient and high temperature Vickers indentation, and notched-beam three point flexure.

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Ceramics Engineering

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2014

Author dc:creator

• Jero, Paul Daniel

Contributors dc:contributor

• Kriven, W.M.,

• Engineering, Materials Science

Identifier

(UMI)AAI8823158

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/71711