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Min

Member Since 31 Mar 2010
Offline Last Active Aug 31 2014 11:50 PM
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Posts I've Made

In Topic: Honey/amber Translucent /transparent Cone 6 Glaze

31 August 2014 - 08:35 PM

Yup, 3195 is high in boron and calcium. I got rid of the bentonite in the altered version below, there is 25% EPK in it now so I don't think you will need the bentonite. Chemistry is fairly close, I included the unity formula, expansion figures etc so you can compare the two. I think it looks okay on paper but you have to try it on a test piece to be sure.

 

new version with no 3195
=========================================

EP Kaolin................... 25.10
Silica...................... 22.80
3134........................ 20.90
Australian Spodumene........ 12.80
Dolomite.................... 13.10
Nepheline Syenite........... 5.30
=Manganese Dioxide .......... 3.00
=Iron Oxide Red.............. 2.00
=========
105.00

CaO 0.44* 8.73 9.98
Li2O 0.10* 1.03 2.22
MgO 0.21* 3.06 4.86
K2O 0.01* 0.36 0.24
Na2O 0.13* 2.85 2.95
P2O5 0.00* 0.09 0.04
TiO2 0.00 0.10 0.08
Al2O3 0.41 14.78 9.29
B2O3 0.21 5.09 4.69
SiO2 2.76 58.52 62.42
Fe2O3 0.04 2.22 0.89
MnO 0.00* 0.00 0.00
MnO2 0.10* 3.16 2.33

Cost: 0.24
Calculated LOI: 9.64
Imposed LOI:
Si:Al: 6.72
SiB:Al: 7.22
Thermal Expansion: 6.25
Formula Weight: 283.24

 

Original version with 3195
=========================================

EP Kaolin................... 14.00
Silica...................... 23.00
Frit 3195................... 16.60
Bentolite L................. 2.00
3134........................ 4.80
Australian Spodumene........ 15.00
Dolomite.................... 15.00
Nepheline Syenite........... 10.00
Manganese Dioxide .......... 3.00
Iron Oxide Red.............. 2.00
=========
105.40

CaO 0.40* 7.87 8.95
Li2O 0.11* 1.20 2.56
MgO 0.25* 3.51 5.56
K2O 0.02* 0.55 0.37
Na2O 0.12* 2.61 2.69
P2O5 0.00* 0.06 0.03
TiO2 0.00 0.06 0.05
Al2O3 0.40 14.50 9.07
B2O3 0.21 5.14 4.71
SiO2 2.80 59.24 62.87
Fe2O3 0.04 2.13 0.85
MnO 0.00* 0.00 0.00
MnO2 0.10* 3.13 2.30

Cost: 0.22
Calculated LOI: 9.08
Imposed LOI:
Si:Al: 6.94
SiB:Al: 7.45
Thermal Expansion: 6.11
Formula Weight: 284.07


In Topic: Honey/amber Translucent /transparent Cone 6 Glaze

31 August 2014 - 01:31 PM

Babs,

 

I noticed in your other post that you are looking for an Oz equivalent for 3195, do you want me to redo my recipe to get rid of the 3195? 


In Topic: Wood Fired Kilns

29 August 2014 - 10:07 PM

Here's the wood fired earthenware bottle kiln that I did consulting work on for the build back in 1978-1979 (I think).  http://www.centralma...village-june-13

 

The fire it a couple of times a year. I think it is still operational.

 

best,

 

................john

 

Very nice!!! 

 

Any plans on writing a book on kiln building? On second thought, you could write a book on every subject in ceramics, you know, in your spare time.   ;)


In Topic: Honey/amber Translucent /transparent Cone 6 Glaze

29 August 2014 - 08:11 PM

Thanks Min, I have been learning,slowly from books the chem. of glaze formulas but still do not know enough to be confident in these matters. You're right, many decimal points the other way.
Will be testing the glaze on tiles/small pots very soon.
I was reconstituting a glaze which had totally dried out in bucket. On sieving, part of the glaze slurry would not go thro' the sieve after many run through and watering down.
Will be testing that too.
Had any experience with this? Obviously the resulting suspension in my  bucket now is lacking in something.
Don't hae the recipe here but just wondring whilst a t the keyboard.

You could try taking the stuff that doesn't go through the screen and heating it up in some boiling water to see if it will dissolve. I would guess it's some soluble stuff that has crystallized in the dry bucket.

In Topic: Honey/amber Translucent /transparent Cone 6 Glaze

29 August 2014 - 10:31 AM

 

 This kind of colour? This is over porcelain, lowish expansion of 6.11

 

 

EP Kaolin                    14.00
Silica                           23.00
Frit 3195                     16.60
Bentolite L                    2.00
3134                            4.80
Australian Spodumene 15.00
Dolomite                      15.00
Nepheline Syenite        10.00
Manganese Dioxide       3.00
Iron Oxide Red               2.00

 

    total:                        105.40

Min looking to mix this up this arvo and a question: Bentolite in the glaze recipe as an additive?  Total 105.4 but the Mn and Fe are additives, right? and i'm asking if the bentonite is also an additive before I convert to percetages prob going to consider these 3  in this light.

Just wondering how you approach this.

 

 

Hi Babs,

 

 Since there is a fair amount heavy sinking material, (frit, silica, nepsy plus the spod) I added the bentonite to the base and kept it as a "static" ingredient when working out the formula then rejigged it to add up to 100. I worked on the base first then figured out the colourants that's why the bentonite is in the base.

 

I'll redo the recipe if you like to have the bentonite as an additive after the 100 base but it will leave you with a lot of decimal points with the base ingredients. Doesn't matter to the glaze where you put the bentonite, chemical formula will be the same.