Barney Adams on wed 6 jan 99
Hi,
I finally got aound to getting insight and working on actually
firing some of the glazes I've been formulating. In working with
this I went out to the Pathfinder site and dug up the analysis of
the Mars rock Barnacle Bill. My legal name is Barney Bill so
is has some bearing. I used the analysis to enter it into Insight
and then once I entered it in the materials database I brought it up
as recipe 1 to compare with recipe 2 which I tried to match the RO
unity values.
in the materials database I have
CaO : 0.323 4.8%
MgO: 0.303 3.2%
K2O: 0.058 1.5%
Na2O: 0.266 4.4%
TiO2: 0.034 0.7%
Al2O3: 0.478 12.9%
SiO2: 3.600 57.2%
Fe2O3: 0.339 14.4%
MnO: 0.050 0.9%
My first question is the analysis had FeO rather than Fe2O3. I replaced
the Fe2O3 1:1 what would be the more exact value or should I use black
iron oxide?
I call the stuff "barnacle bill" after the rock not me. The recipe I
came up
with and all follows:
& Barnacle Bill
================
Barnacle Bill 100.00
My substitute
NEPHELINE SYENITE 34.01 34.012%
FLINT 28.63 28.626%
GROLLEG KAOLIN 9.97 9.974%
IRON OXIDE RED 13.21 13.206%
WHITING 5.69 5.685%
MAGNESIUM CARBONATE 6.80 6.802%
MANGANESE DIOX. MnO2 1.04 1.037%
RUTILE 0.66 0.658%
======= =======
100.00 100.00
CaO 0.323 4.787% 5.916%mol 0.323 4.785% 5.926%mol
MgO 0.303 3.226 5.550 0.303 3.226 5.562
KNaO 0.325 1.457 1.072 0.324 2.010 1.482
SrO 0.001
0.019 0.012
TiO2 0.034 0.728 0.632 0.034 0.717 0.623
ZrO2 0.000
0.007 0.004
Al2O3 0.478 12.903 8.772 0.478 12.884 8.775
SiO2 3.600 57.232 66.030 3.595 57.105 66.012
Fe2O3 0.339 14.360 6.223 0.339 14.329 6.222
MnO 0.050 0.937 0.916 0.050 0.929 0.910
Cost/kg cheap 0.982
but shipping is prohibative
Si:Al 7.528 7.523
SiB:Al 7.528 7.523
Expan 7.729 7.755
My next question is: Am I wrong to go at matching the RO unity rather
than the analysis values?
I matched the KNaO RO-Unity but the ratio of K2O and Na2O is not
correct.
Would a good approach to matching these values be to make my own frit?
I doubt I have the resources to under take making my own frit, but out
of
curiosity what are the steps involved. I'm pretty sure the last step
would involve
a ball mill which is where I'd be stuck.
Oh, I mixed up a glaze with my substitute barnacle bill for ^6
oxidation although reduction ^6 should be interesting since the Fe2O3
then becomes a flux.
It's dark brown as if the Fe2O3 amount would'nt tell you that. It does
some nice
stuff with other glazes. Tenmoko and it gives a shiny black breaking
rust red.
I think this is safe although I would leave it to the other authorities
to give their
okay.
Barnacle Bill (sub) 77.0
Spodumene 23.0
======
100.0
CaO 0.250 3.709% 4.464%mol
Li2O 0.222 1.753 3.973
MgO 0.233 2.492 4.175
K2O 0.046 1.153 0.826
Na2O 0.210 3.447 3.754
TiO2 0.027 0.565 0.477
Al2O3 0.591 15.965 10.569
SiO2 3.713 59.086 66.385
Fe2O3 0.262 11.108 4.688
MnO 0.039 0.723 0.689
Si:Al 6.281
SiB:Al 6.281
Expan 7.028
Barney
Ron Roy on fri 8 jan 99
Hi Barney,
Most of us do it my matching the molecular formula but there are some
experts who do it by matching the analysis.
Why not do it both ways and tell us which worked the best?
I would just add the K2O and Na2O together and match that. Use the finest
materials you can get and give it a chance to melt well by firing slower
rather than faster.
RR
>My next question is: Am I wrong to go at matching the RO unity rather
>than the analysis values?
>
>I matched the KNaO RO-Unity but the ratio of K2O and Na2O is not
>correct.
Ron Roy
93 Pegasus Trail
Scarborough, Ontario
Canada M1G 3N8
Tel: 416-439-2621
Fax: 416-438-7849
Web page: http://digitalfire.com/education/people/ronroy.htm
Barney Adams on sat 9 jan 99
Thanks Ron,
I've kinda discovered doing anything faster in clay does'nt work too well.
For me any how. I tend to test my glazes using the pre-programmed ^6
medium speed for my Skutt and then try it again with my own programs.
The my programs are slower than the Skutt program and I take it from
your message that would be okay. Or do you mean firing longer than my
10 to 12 hour firing schedules?
Barney
Ron Roy wrote:
> ----------------------------Original message----------------------------
> Hi Barney,
>
> Most of us do it my matching the molecular formula but there are some
> experts who do it by matching the analysis.
>
> Why not do it both ways and tell us which worked the best?
>
> I would just add the K2O and Na2O together and match that. Use the finest
> materials you can get and give it a chance to melt well by firing slower
> rather than faster.
>
> RR
>
> >My next question is: Am I wrong to go at matching the RO unity rather
> >than the analysis values?
> >
> >I matched the KNaO RO-Unity but the ratio of K2O and Na2O is not
> >correct.
>
> Ron Roy
> 93 Pegasus Trail
> Scarborough, Ontario
> Canada M1G 3N8
> Tel: 416-439-2621
> Fax: 416-438-7849
>
> Web page: http://digitalfire.com/education/people/ronroy.htm
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