| Thermal analysis of Al,O.-H.PO.,Cr03 |
A. K. RoY AND N. R. SIRCAR
Pages : 159-163
DOI : 10.1080/0371750X.1982.10822600 |
| Abstract |
| Thermal analysis of several compositions in Al,O.-H.PO., Al.OaH3P04-
Cr03, AI(OH).-H3P04 and AI(OH),-Cr03-HaPO. systems
was carried out for the purpose of ascertaining the trend of the reactions
on heat treatment. Cr03 in aluminium phosphate bonds reduces
moisture sensitiveness of the-product.
Cr03 was incorporated wth H3P04 to the extent up to 30%. The
different experiments were carried out up to 1000°C. Thermogravimetric
curves indicated that the course of dehydration of Al.Oa-HaPO.
was prolonged in the presence of Cr03. An interesting feature of the
DTA curves of AI(OH)3-H3P04 and AI(OH).-H3PO.-Cr0a was the
absence of the endothermic peak at 120°C in the presence of CrO •.
The various peaks and rate loss for the above systems were discussed
and probable mechanisms suggested. |
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