Inhaltszusammenfassung

Phosphates are used in high-temperature materials as bonding agents to increase the (early-)strength and resistances towards corrosive media. Although the initialization of phosphate bonds has been explained in scientific literature, especially the cross-linking behavior of phosphate species during firing as well as their interaction and compatibility with other ceramic components are still not clearly understood and insufficiently investigated. This research concerns how the addition of MgAl...Phosphates are used in high-temperature materials as bonding agents to increase the (early-)strength and resistances towards corrosive media. Although the initialization of phosphate bonds has been explained in scientific literature, especially the cross-linking behavior of phosphate species during firing as well as their interaction and compatibility with other ceramic components are still not clearly understood and insufficiently investigated. This research concerns how the addition of MgAl2O4 to an alumina-rich refractory changes its bonding mechanism and, consequently, affects key performance characteristics of the ceramic. The approach is based on a comprehensive analysis which gives insight into structural changes of the bonding phase and, ultimately, allows structure-property-correlations to be drawn. Results demonstrate that the addition of MgAl2O4-spinel (1) leads to the formation of Magnesium hydrogen phosphates during initialization, (2) influences the cross-linking of the Aluminium phosphate bonding network (less polymerization) and (3) results in Mg-containing high-temperature ortho phosphates, which significantly reduce the bonding capacity and high temperature properties of the refractory.» weiterlesen» einklappen

Autoren

Klassifikation

DFG Fachgebiet:
Materialwissenschaft

DDC Sachgruppe:
Ingenieurwissenschaften