| About this Abstract |
| Meeting |
MS&T21: Materials Science & Technology
|
| Symposium
|
Preceramic Polymers; Synthesis, Processing, Modeling, and Derived Ceramics
|
| Presentation Title |
Thermomechanical Performance of a Novel Class of Ultra-high Temperature Polymer Derived La Containing Zr-B-C-(O) Ceramics |
| Author(s) |
Gokul Nanda Gopakumar, Ganesh Babu T, Renjith Devasia, Ravi Kumar |
| On-Site Speaker (Planned) |
Gokul Nanda Gopakumar |
| Abstract Scope |
Due to the poor oxidation resistance of silicon-based polymer-derived ceramics (PDCs) at temperatures above 1600 °C, a new PDC was synthesized to obtain ultra-high temperature ceramics with better oxidation resistance. In this work, La incorporated Zr-B-C-(O) ceramics were synthesized by modifying phenol formaldehyde resin with precursors of lanthanum, zirconium and boron. The resulting polymer and its bonding characteristics were studied using FTIR and its pyrolysis temperature was determined using TGA. From X-ray diffractograms, the as-pyrolysed ceramics were found to be amorphous. On heat treatment at 1600 °C, the ceramic crystallised into La2Zr2O7, tetragonal-ZrO2, and ZrC. However, by increasing the amount of boron added during precursor synthesis, the crystallization of the above phases was suppressed and the amorphous state of the material was stabilised. The microstructural analysis of the phases was done using TEM. Thermomechanical properties like density, dilatometry, hardness, moduli, and oxidation resistance was measured on the spark-plasma-sintered ceramic. |