Ceramic adhesives are used to seal ceramic assembly or to bind parts together. basically, a slurry to be applied in gaps, cracks or dents, that solidifies with no heat source and turns as hard as genuine ceramic. this is generally sold as a "one compound" product, a alumina + solvant mix (separetely sometimes). Based on that, I look to figure out how all of this works, what are the chemical reactions behind.
Ingredients and compound: Alumina alpha-gama phase, NaOH lower than 1%wt. ,
presence of K 3.5%, Li 0.13%, Na 1.17%, Si 2.2% following ICP AES analysis.
if very briefly, in a ceramic adhesive (base - oxide), due to chemical reactions from a solvent around oxide grains, hydrate layers are formed; these layers serve as a binder between each grain.
Vyacheslav Nikichanov thanks a lot for your contribution. Could you bring more details regarding these chemical reactions? what would be a typical reaction equation between base (KOH or NaOH) and oxide (Al2O3 alpha-gamma phase) compounds ? I can't find something consistent at the present time.
thanks a lot.
Al(ОН)₃ + NaOH = Na[Al(OH)₄]),
Al₂O₃ + 2NaOH + 3H₂O = 2Na[Al(OH)₄]
Here are examples of chemical reactions. But K 3.5%, Li 0.13%, Na 1.17%, Si 2.2% all these elements can be used for liquid glass, which is used in some types of plasters or fillers
Vyacheslav Nikichanov it would make sense with the elements given by ICP AES. Thank you for your help, appreciate it.
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