Study on aluminum phosphate binder and related Al2O3–SiC ceramic coating

New insights into the thermal evolution of aluminophosphate solutions: A complementary XRD and solid state NMR study

“…This polymerisation from Al(H 2 PO 4 ) 3 to AlH 2 P 3 O 10 ,xH 2 O and to Al(PO 3 ) 3 [B] and [A] is supported by our XRD analyses and confirms the previous study. [3][4][5][6][7][8][9] Nevertheless, it appears that the information deduced from the XRD analyses is not sufficient to fully explain the 31 P and 27 Al spectra and thus do not allow for a complete chemical characterisation of the binders. A complete assignment of the 31 P and 27 Al resonances is thus necessary to provide an improved understanding of the chemical composition of the binders.…”

“…A large number of studies have been carried out to characterise the thermal evolution of solutions with P/Al ratio between 2 and 3. [3][4][5][6][7][8][9] It is now well established from all these studies that temperature induces a progressive polymerisation of the aluminophosphate species from Al(H 2 PO 4 ) 3 to AlH 2 P 3 O 10 ,xH 2 O and then to monoclinic and cubic Al(PO 3 ) 3 (denoted as Al(PO 3 ) 3 [B] and [A], respectively) 9 at 500-600 • C. Al(PO 3 ) 3 [A] is then stable until melting, which occurs at 1400 • C.…”

An Overview on Zeolite Shaping Technology and Solutions to Overcome Diffusion Limitations

“…An alternative to alumina binder has been proposed by several groups that consists in modified pseudo-boehmite by adding P through phosphoric acid to the binder, forming an amorphous AlPO phase [17][18][19][20]. Freiding et al confirmed that aluminum phosphate-bound zeolite extrudates exhibit no acidity due to interaction of phosphate species with the acid sites.…”

Self-Forming 3D Core–Shell Ceramic Nanostructures for Halogen-Free Flame Retardant Materials

“…These phosphates are used as binders in refractory materials, metal protective coatings and flame retardant systems due to their thermal and chemical stability properties. [11][12][13] These applications are due to the ability of acid phosphate to polymerize at low temperature. 14 It is well known that phosphate species containing P-OH groups have the ability to form polymeric phosphates by condensation.…”