Ceramic materials with high strength, stiffness, and temperature stability are critically important to a wide array of applications that experience harsh conditions, including aggressive chemical handling, high-performance friction components, and spacecraft heat shields. Processable pre-ceramic materials are crucial to a range of applications especially with regard to filling interstitial spaces in preform materials to give ceramic matrix composites. Preceramic polymers (PCPs) with added transition metals and nanoparticle components offer an attractive way to reduce the changes in density and volume during solid ceramic formation from liquid pre-ceramic materials. This presentation will discuss methods of boosting char yields via: (1) the effects of cross-linking polymers via transition metal centers, and (2) the cross-linking of polymers via metal centers and to a nanoparticle surface as an exciting way to stop phase separation. The metal-polymer and polymer-metal-nanoparticle (PMN) systems are studied via thermogravimetric analysis pre-pyrolysis. Post-pyrolyzed at 1600 °C the polymers are studied by X-ray diffraction, Raman spectroscopy, transmission electron microscopy with energy dispersive X-ray spectroscopy (EDS), and scanning electron microscopy with EDS. A dramatic increase in char yield of the metal-polymer and PMN systems relative to the summed char yields of the individual components is observed showing a significant synergist effect when forming a ceramic material via these approaches.

High char yield preceramic materials from nanoparticles, transition metals, and polymers

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