Geopolymers for Structural Ceramic Applications

Geopolymer cements (GPs) possess the ability to quickly form high-strength, thermally-stable, and near-net shape structures at room temperature. Their chemical nature enables them to bond strongly to both metal and ceramic parts acting as refractory glue. Through our work in the Phase I STTR, a detailed understanding of the basic chemistry, structure, processing conditions, thermal behavior, and composite manufacturing has been gained. Phase II will extend upon this knowledge in a few promising application areas. Low cost GP molds were already shown to function well in the field as a method to solidify near-net shape molten metal parts. Improvements to the material design will now focus on material durability over multiple cycles. By tailoring chemistry and heating, one can use GPs to produce a variety of crystalline phases of defined properties as well as high strength ceramic matrix composites (CMC). The use of GPs to bond ceramic and metal parts will also be further explored in more detail in relation to commercialization potential.