Bruce Girrell on mon 15 dec 03
Anybody have any idea what kind of fluxes or perhaps what kind of frit could
I use to get a base glaze to melt at about 600 degrees C? I would, of
course, like to avoid the use of lead.
Any suggestions are welcome.
Bruce Girrell
Ron Roy on thu 18 dec 03
Hi Bruce,
Boron is the answer - if you look at the dilatometer charts in chapter 5 of
uor book you will see - they all are soft at 700C - that is after they have
been fired to cone 6 though.
Adding more boron will bring them down.
Use as much frit as you can - it's already been melted to it will remelt
faster - start with 3134 and kaolin - watch out for running.
3134 - 60.0
EPK - 25.0
Silica - 15.0
Total - 100.0
3134 - 45.0
3124 - 25.0
EPK - 12.0
Silica - 18.0
Total - 100.0
Start with these and keep upping the frits - remember - it's the boron that
will do the work down at 600 - long soaks will certainly help the melting a
lot.
RR
Does it have to be a stable glaze?
>Anybody have any idea what kind of fluxes or perhaps what kind of frit could
>I use to get a base glaze to melt at about 600 degrees C? I would, of
>course, like to avoid the use of lead.
>
>Any suggestions are welcome.
>
>Bruce Girrell
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
Phone: 613-475-9544
Fax: 613-475-3513
Bruce Girrell on thu 18 dec 03
> Boron is the answer -
> Does it have to be a stable glaze?
Thanks, Ron. No, it doesn't have to be stable. We want to be able to apply a
black colorant to our burnished horsehair decorated pieces. The pieces are
all sculptural - couldn't drink out of them if you tried, though I suppose
someone could turn one upside down and put a dollop of CheezWiz on it.
It's easy to get black. Getting black to stick to something is a different
story. We just need something that will melt low enough that we don't lose
our burnish. We could probably bump the temp up a little to melt the stuff
just enough to make it stick, then let it cool back down to horsehair temps.
Bruce Girrell
in snowy northern Michigan with the Stak-O-Brix climbing up toward 1000F (on
just the pilots) as we speak
John Hesselberth on thu 18 dec 03
Hi Bruce,
You might try 100% frit 3195 if you can figure out how to keep it in
suspension long enough to get it on your pot. It is pretty well
balanced with decent levels of alumina and silica and should get you
close. It is probably the lowest melting of the commonly available
frits. Boron is over 1.1 and it also has a good amount of alkalis.
Regards, John
On Thursday, December 18, 2003, at 12:04 PM, Ron Roy wrote:
>> Anybody have any idea what kind of fluxes or perhaps what kind of
>> frit could
>> I use to get a base glaze to melt at about 600 degrees C? I would, of
>> course, like to avoid the use of lead.
>>
>> Any suggestions are welcome.
>>
>> Bruce Girrell
http://www.frogpondpottery.com
http://www.masteringglazes.com
iandol on fri 19 dec 03
Dear Ron,
In answer to a question about getting glazes which will melt in the temp =
range of 600 C you say <<dilatometer charts in chapter 5 of our book you will see - they all are =
soft at 700C - that is after they have been fired to cone 6 though.>>
I think there is a non sequitur here. Surely the dilatometer readings =
are given for materials which have been taken to maturity, cooled and =
then been tested. So what we read from your charts are the Remelt values =
not the original maturity temperatures..
Boron may be the answer "...if Boric acid is used.." since this gives =
boron oxide melts at 460=BAC after it decomposes.
My own first reaction was to suggest Bismuth Oxide but the melting point =
here is up a 800=BAC. However there is some room for experimentation if =
you can get hold of a copy of Fig 323 in the 1964 Ed of "Phase Diagrams =
For Ceramists". This shows clearly that it is possible to create several =
Bismuth Borates which will melt in the temperature region under =
discussion, possibly by hot digestion of Bismuth Carbonate by Boric =
acid. And, wonders never cease!! there are two such compounds which will =
give you a Eutectic at 622=BAC.=20
I recall Khaimraj Seepersad (E-mail coldbozo@tstt.net.tt) did some work =
in this field about three years ago. Might be in the Archives
Best regards,
Ivor Lewis. Redhill, South Australia
Earl Krueger on fri 19 dec 03
On Thursday, Dec 18, 2003, at 12:28 US/Pacific, Bruce Girrell wrote:
> all sculptural - couldn't drink out of them if you tried, though I
> suppose
> someone could turn one upside down and put a dollop of CheezWiz on it.
And once again it has been proved that imaginative people will find
innovative ways to use your non-functional ware for food service.
Earl...
Bothell, WA, USA
Hmmm??? If something you make is not "functional ware" does that mean
it is "non-functional ware" in which case does that mean it does not
function for the purpose intended by the maker? Oh, the vagaries of
language !!!
| |
|
