Paul Lewing on wed 7 mar 01
Brian Molanphy wrote:
> so brian wonders:
>
> what is the difference between an oxide which is a 'flux', and an oxide
> which 'tends to fuse things'?
I'd say they were the same, just expressed in different words.
if, as paul says, manganese is refractory, how
> could it also tend to fuse things? perhaps this is another case -like iron-
> of different behavior at different temperatures?
I'm basing what I said about colorants being fluxes or not on where they
fall in the RO/ R2O3/ RO2 columns. Copper, chrome, cobalt, and reduced
iron all fall into the RO (flux) column. Manganese (MnO2) falls into
the RO2 (glass-former) column. Oxidized iron falls into the R2O3
(stabilizer) column.
I don't think much real research has been done on the effects of
colorants on either the fluxing or the expansion of coloring oxides.
Probably because they are usually used in such small concentrations that
the effects are minimal.
Paul Lewing, Seattle
Brian Molanphy on wed 7 mar 01
lila k wrote:
> Some colorants are fluxes; some are somewhat refractory; copper and MnO2
> tend to fuse things, some like chrome and nickel are refractory.
> According to some red iron oxide does nothing black iron oxide fluxes. As
> colorants are
> used in such small quantities the influence is rarely something to get
> worked up over.
>
paul lewing wrote:
> Copper, cobalt and chrome are mild fluxes. Manganese is refractory.
> Iron is a flux in reduction and refractory in oxidation.
>
so brian wonders:
what is the difference between an oxide which is a 'flux', and an oxide
which 'tends to fuse things'? if, as paul says, manganese is refractory, how
could it also tend to fuse things? perhaps this is another case -like iron-
of different behavior at different temperatures?
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