Abstract
Chemically bonded phosphate ceramics (CBPCs) are developed by reacting the three major phases of iron oxides (wüstite, magnetite, and hematite) by reacting them with phosphoric acid solutions. While for wüstite and magnetite simple acid-base reactions can be used, for hematite the reduction mechanism described in Chapter 7 needs to be employed. The resulting products are glass ceramics, rich in the oxide phase, and hence it is difficult to employ X-ray diffraction techniques to identify the binding phases. However, electrochemical approach can shed some light on these phases. More work using Raman and infrared spectroscopy is needed to understand these glass ceramics. Practical applications include treating metal swarf waste streams, development of corrosion protection coatings (discussed in Chapter 15), and possibly low-cost structural products.
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