Geopolymer Porous Nanoceramics for Structural Smart and Thermal Shock Resistant Applications

摘要

We have continued our work to understand and elucidate the microstructure of geopolymers and geopolymer composites, as fabricated and upon conversion to ceramics with heating. The microstucture consisted of nanoporous, nanparticular precipitates and contains 40% nanoporosity of average diamter 6.8nm in the case of K-based geopolymer. The room temperature compressive strengths were systematically investigated as a function of Group I charge balancing cations (Na, K and Cs and mixtures of Na-K). Potential applications were explored in the area of refractory adhesives between metal, corrosiion resistant coatings on steel, glass and ceramics, porous membrances and foams, ceramic armore composites, iron-based geopolymer analogues, geopolymer composites reinforced with chopped polypropylene or basalt fibers and polycrystalline ceramics or glass-ceramics. The basic sciencxe of amorphous geopolymer structure was probed down to the Angstrom level by state of the air Pair Distribution Function analysis (PDF) of X-ray synchrotron data.