Abstract
In this paper, a new kind of high infrared emissivity material, amorphous aluminum phosphate (AlPO4) was fabricated by polyesterification reaction between P2O5 and Al(NO3)3·9H2O in ethyl alcohol (EtOH) solvent, followed by being calcined at certain temperatures. And the influence of calcination temperatures on crystallization behavior, solid 27Al and 31P chemical shift changes and infrared radiation performance were studied. DSC-TG curves demonstrate that no significant crystallization and crystal transformation occurred below 900 °C. XRD patterns and 27Al and 31P NMR spectra reveal P and Al chemical coordination transformation from octahedral to tetrahedral, these characterizations all prove that AlPO4 in amorphous state possesses higher emissivity than that of crystalline AlPO4. Amorphous AlPO4 with the highest infrared emissivity of 0.913 was prepared at 900 °C.
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