Panama c6 - Lower COE #7
|
Code # G3806K |
| P | Materials | Amt |
|---|---|---|
| Silica | 21.500 | |
| Bentonite | 2.000 | |
| Kaolin | 7.000 | |
| Ferro Frit 3249 | 17.000 | |
| Zinc Oxide | 2.500 | |
| Fusion Frit F-493 | 7.500 | |
| Fusion Frit F-524 | 42.500 |
| P | Additions | |
|---|---|---|
| * | Copper Carbonate | 4.000 |
| * | Tin Oxide | 2.500 |
Total:106.50
Auto Unity Formula
|
Si:Al: 10.4:1 5.8 (Molar:5.5) 1.1 Cost 0.00 per kg |
Notes
*This version makes a bold change: Doubling the B2O3. And raises the SiO2 somewhat.
And another bold change: Sourcing Li2O and SrO from Fusion frits. This doubles the percentage of frit in the recipe. Why? I want a consistently crystal-clear glass. The very best way to get that is to reduce materials that have a weight loss on firing (like strontium, kaolin) and maximize frit content.
This is certainly the most fluid so far.
It is an exciting step because the Al2O3 and SiO2 are high (making it likely to be durable) but the fluidity leaves room to raise them much higher! That will nudge the thermal expansion even lower.
The 7% koalin seems to be adequate for suspending the slurry because it is assisted by 2% bentonite.
Pictures
G3806K on M370, Coffee clay
Crystal clear, running nicely.
G3806K ball pool - some bubbles
Now that is melt fluidity! G3806K with and without copper
This is clearly running much better than any previous. Much fewer bubbles. Even some crystallization on lower flow. More Al2O3 will reduce that.
G3806K on Polar Ice - really running
It is pooled in the bottom of the mug. Polar Ice.
This survived 325F to ice water without crazing!
G3806K on coffee clay
XML (to paste into Insight)
<?xml version="1.0"?> <recipes version="1.0" encoding="UTF-8"> <recipe name="Panama c6 - Lower COE #7" id="158673" key="JreGEzib" date="2019-08-08" codenum="G3806K" email="untdkm@sasktel.net"> <recipelines> <recipeline material="Silica" amount="21.500" tolerance=""/> <recipeline material="Bentonite" amount="2.000" tolerance=""/> <recipeline material="Kaolin" amount="7.000" tolerance=""/> <recipeline material="Ferro Frit 3249" amount="17.000" tolerance=""/> <recipeline material="Zinc Oxide" amount="2.500" tolerance=""/> <recipeline material="Fusion Frit F-493" amount="7.500" tolerance=""/> <recipeline material="Fusion Frit F-524" amount="42.500" tolerance=""/> <recipeline material="Copper Carbonate" amount="4.000" added="true"/> <recipeline material="Tin Oxide" amount="2.500" added="true"/> </recipelines> </recipe> </recipes>
Born: 2015-06-02, Modified: 2019-08-08 14:36:32
Panama c6 - Lower COE #8
|
Code # L3806L |
| P | Materials | Amt | |
|---|---|---|---|
| Silica | 20.000 | 19.32% | |
| Bentonite | 2.000 | 1.93% | |
| Kaolin | 12.000 | 11.59% | |
| Ferro Frit 3249 | 17.000 | 16.43% | |
| Zinc Oxide | 2.500 | 2.42% | |
| Fusion Frit F-524 | 42.500 | 41.06% | |
| Fusion Frit F-493 | 7.500 | 7.25% |
| P | Additions | ||
|---|---|---|---|
| * | Copper Oxide | 4.000 | 3.86% |
| * | Tin Oxide | 2.500 | 2.42% |
Total:110.00
Auto Unity Formula
|
Si:Al: 8.8:1 5.8 (Molar:5.5) 1.6 Cost 0.00 per kg |
Notes
*This is the first in a series to increase the amount of Al2O3 in G3806K (to decrease the melt flow and further lower the thermal expansion). The more Al2O3 it will accept, the more durability the fired product will also have.
No pure form of Al2O3 will melt well enough so I am sourcing it from raw and calcined kaolin.
I will continue to increase the Al2O3 until fluidity is the same as the original G3806C.
Pictures
Melt fluidity of G3806L and M
They have the same chemistry. The L sources Li2O from a frit, the M from lithium carbonate.
M is crystallizing more and running less.
G3806L and M on M370 porcelain - Cone 6
L has a little more glassy surface.
G3806L (outside) and G3806M (inside)
Cone 6, drop and soak, slow cool firing.
On M370.
There is a little crazing after 325F to icewater test.
XML (to paste into Insight)
<?xml version="1.0"?> <recipes version="1.0" encoding="UTF-8"> <recipe name="Panama c6 - Lower COE #8" id="158770" key="wC8tGAf8" date="2019-07-20" codenum="L3806L" email="untdkm@sasktel.net"> <recipelines> <recipeline material="Silica" amount="20.000" tolerance=""/> <recipeline material="Bentonite" amount="2.000" tolerance=""/> <recipeline material="Kaolin" amount="12.000" tolerance=""/> <recipeline material="Ferro Frit 3249" amount="17.000" tolerance=""/> <recipeline material="Zinc Oxide" amount="2.500" tolerance=""/> <recipeline material="Fusion Frit F-524" amount="42.500" tolerance=""/> <recipeline material="Fusion Frit F-493" amount="7.500" tolerance=""/> <recipeline material="Copper Oxide" amount="4.000" added="true"/> <recipeline material="Tin Oxide" amount="2.500" added="true"/> </recipelines> </recipe> </recipes>
Born: 2015-06-02, Modified: 2019-07-20 17:00:52
Kieth Davitt High-fluid-melt copper blue
|
Code # G3888 |
| Materials | Amt |
|---|---|
| custer feldspar | 44.700 |
| Silica | 15.800 |
| Lithium carbonate | 3.700 |
| Ferro Frit 3124 | 4.700 |
| whiting | 14.900 |
| Strontium carbonate | 7.000 |
| bentonite | 2.800 |
| Additions | |
|---|---|
| copper carbonate | 7.400 |
Total:101.00
Auto Unity Formula
|
Si:Al: 10.0:1 7.6 (Molar:7.2) 14.8 Cost 0.17 per kg |
Notes
*Keith says this has blistering problems.
It also has a high COE which means it will craze on many bodies.
It lacks clay, which means it will settle in the buckets and have poor adherence to bisque.
It has a very high LOI which means it could have bubbles in the fired matrix.
The Al2O3 and SiO2 are exceptionally low for a mid temperature glaze, that signals leaching and poor durability.
Pictures
G3888 glaze blister
XML (to paste into Insight)
<?xml version="1.0"?> <recipes version="1.0" encoding="UTF-8"> <recipe name="Kieth Davitt High-fluid-melt copper blue" id="158891" key="BthKLgfX" date="2019-07-15" codenum="G3888"> <recipelines> <recipeline material="custer feldspar" amount="44.700"/> <recipeline material="Silica" amount="15.800"/> <recipeline material="Lithium carbonate" amount="3.700"/> <recipeline material="Ferro Frit 3124" amount="4.700"/> <recipeline material="whiting" amount="14.900"/> <recipeline material="Strontium carbonate" amount="7.000"/> <recipeline material="bentonite" amount="2.800"/> <recipeline material="copper carbonate" amount="7.400" added="true"/> </recipelines> </recipe> </recipes>
Born: 2019-07-15, Modified: 2019-07-15 14:37:07
