tag:blogger.com,1999:blog-216370437384092286.post1585186499509351104..comments2023-10-20T07:43:27.253-04:00Comments on Slipcast-The Ceramics Blog: Heat-Pt. 1-ConesMatthew Katzhttp://www.blogger.com/profile/15576916788056882343noreply@blogger.comBlogger13125tag:blogger.com,1999:blog-216370437384092286.post-79142511348583220282009-09-09T10:40:45.111-04:002009-09-09T10:40:45.111-04:00Hi Eleanora
The O1 Transition came when people rea...Hi Eleanora<br />The O1 Transition came when people realized that Lower temperatures were needed, yet the existing chemistry could not function in the existing model. <br />A system was eventually created using Iron as a flux that was able to achieve those temperatures. I don't not know for sure, but the 01, 02 naming methodology, I suspect was just the method that seemed logical for moving below the established 1,2,3 system that had been created.Matthew Katzhttps://www.blogger.com/profile/15576916788056882343noreply@blogger.comtag:blogger.com,1999:blog-216370437384092286.post-6238050653358119312009-09-08T15:10:49.579-04:002009-09-08T15:10:49.579-04:00When I was firing some loads at ^1 I was quite con...When I was firing some loads at ^1 I was quite confused by the ^01/^1 situation. I queried the Orton company without response. Looking forward to your comments on that.<br /><br />This a very welcome topic.<br /><br />Eleanora EdenEleanora Edenhttp://www.eleanoraeden.comnoreply@blogger.comtag:blogger.com,1999:blog-216370437384092286.post-8276907747881475302009-08-21T23:16:14.353-04:002009-08-21T23:16:14.353-04:00Hey there Matt-
Question along this same line...
i...Hey there Matt-<br />Question along this same line...<br />if one were to take a glaze currently working well at c5, and wanted to increase the glaze's maturation temp to c6 for the sake of the claybody (and having just simply pushed the glaze to c6 with no mods it looks awful!)....<br /><br />would I simply increase the ratio<br />by 1:.1:1? (flux:Al:Si)<br />Ie, if the UMF looks like: 1:.631:3.57<br /><br />Would altering that to 1:.731:4.57 bring the maturation temp up a solid cone?<br /><br />Am I understanding Seger's process?Alex Sollahttps://www.blogger.com/profile/12222528761667893874noreply@blogger.comtag:blogger.com,1999:blog-216370437384092286.post-68764810802012115232009-08-03T07:50:39.241-04:002009-08-03T07:50:39.241-04:00Hi Ivor
Your interpritation of how the system work...Hi Ivor<br />Your interpritation of how the system works is correct. We are both discribing the same thing in different ways. <br />That said, We do not express flux /glass former in the way you describe. This is because to effectivly analyze the complexaties of the relationsiphs we require something to judge scale. By normalizing to the fluxes we are provided with an interprative scale.Matthew Katzhttps://www.blogger.com/profile/15576916788056882343noreply@blogger.comtag:blogger.com,1999:blog-216370437384092286.post-20201556500683962812009-08-03T02:23:38.854-04:002009-08-03T02:23:38.854-04:00Sorry Matthew,
Mental arithmetic was never one of ...Sorry Matthew,<br />Mental arithmetic was never one of my strong points. Jumped to the wrong conclusion.<br />A better way of expressing the relationship of the fluxing agents to the refractory agents is that as you move up the list from 1 to 12 the quantity of flux is inversely proportional to the quantity of refractories.<br />In other words, as maturity level is increased diminishing quantities of flux are required to achieve an equal temperature rise.<br />Best regards,<br />IvorAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-216370437384092286.post-27843799168597539542009-08-02T13:06:33.788-04:002009-08-02T13:06:33.788-04:00Please write more historical background if it is r...Please write more historical background if it is required. History is not boring. Learning is never boring. Not being curious is boring.May Luk Ceramicshttps://www.blogger.com/profile/08357168715064765277noreply@blogger.comtag:blogger.com,1999:blog-216370437384092286.post-58024213740761392322009-08-02T02:16:53.147-04:002009-08-02T02:16:53.147-04:00Dear Matthew,
The ratio of Aluminium Oxide to Sili...Dear Matthew,<br />The ratio of Aluminium Oxide to Silicon Dioxide is constant. It does not govern the deformation temperatue of pyrometric cones.<br />The governing factor is the ratio of R2O oxides (0.7K2O and 0.3Na2O) which reduces by 1/10 with each incremental addition of [(1)Al3O2/(10)SiO2] <br />Composition for Seger Cones from 022 to 12 can be found in Deboos,Harrison and Smith, Handbook for Australian Potters. IBN0-454-00448-6<br />Best regards,<br />Ivor LewisAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-216370437384092286.post-65964103650589459442009-07-31T23:22:24.281-04:002009-07-31T23:22:24.281-04:00Thank you Matt. I did not know about the cone # r...Thank you Matt. I did not know about the cone # relating to the numerical SI: AL composition.<br />light bulb going ON here!Stephani Stephensonhttp://www.revivaltileworks.comnoreply@blogger.comtag:blogger.com,1999:blog-216370437384092286.post-36936259548637731532009-06-22T09:26:01.477-04:002009-06-22T09:26:01.477-04:00BTW check out the background on my twitter page. w...BTW check out the background on my twitter page. www.twitter.com/matt_davesclays<br />In the Porcelain for the People, you can see my fondness for Parmalee. <br />There is no doubt that UMF is a bear of a system, but the more that Carty and I have researched, we have found that it is literally THE only was to look at glazes. And the use of it in cones should convince everyone of the validity of that idea.Matthew Katzhttps://www.blogger.com/profile/15576916788056882343noreply@blogger.comtag:blogger.com,1999:blog-216370437384092286.post-41636234781988309372009-06-22T09:22:37.470-04:002009-06-22T09:22:37.470-04:00Hi Alex
The question about stability/functionality...Hi Alex<br />The question about stability/functionality does rely on UMF values. What we forget is that UMF values, do represent actual amounts of material in a glaze. So that High Al/Si UMF values, means more Al/Si in the glaze.<br />Also there is a relationship between the temperature of the glaze and the amount of Al/Si. Because, it takes more energy (Higher temperatures)to melt more Al/Si. So, the "stability" is based on those levels. Meaning a glaze with too little Al/Si (ie. a cone 6 glaze) fired to cone 10 will run. Because the excess energy of the hotter firing cannot just be displaced. So when all of the material is melted the system has no choice but to decrease in viscosity (hence running). Conversely, a glaze with too much Al/Si will not melt as there is not enough energy in the kiln to melt the mass od Si/Al, so it will be dry and under-fired. <br />I'll get into the subtleties of this in an upcoming post.Matthew Katzhttps://www.blogger.com/profile/15576916788056882343noreply@blogger.comtag:blogger.com,1999:blog-216370437384092286.post-66918318362511987612009-06-19T11:06:55.015-04:002009-06-19T11:06:55.015-04:00I guess I think in UMF without clarifying... yes, ...I guess I think in UMF without clarifying... yes, for me the ratio always reads flux:al:si<br /><br />So, explain away. <br /><br />Funny thing about this aspect of UMF, was that Val Cushing didnt really delve into it. I learned most of what I know from watching Hyperglaze evolve and from testing ideas on countless glazes. <br /><br />Reading Parmelee helped too.Alex Sollahttps://www.blogger.com/profile/12222528761667893874noreply@blogger.comtag:blogger.com,1999:blog-216370437384092286.post-51322226706908532712009-06-19T07:44:27.860-04:002009-06-19T07:44:27.860-04:00Hi Alex,
Glad to know that this helps! Spread the...Hi Alex, <br />Glad to know that this helps! Spread the word around. <br />The basics of temperature are laid in the UMF and you basic theory is correct, about how to tweak a cone or two. But there are some other subtleties that come into play too. I will address that more thoroughly in a post to come, that is where I am heading with this whole thing. <br />Can you clarify your question? 1:6:6 (?) is that Flux:Al:Si ? If you can clear that up I can answer the question.Matthew Katzhttps://www.blogger.com/profile/15576916788056882343noreply@blogger.comtag:blogger.com,1999:blog-216370437384092286.post-67124221126234074502009-06-18T12:13:15.103-04:002009-06-18T12:13:15.103-04:00I think this may have been one of the epiphanies I...I think this may have been one of the epiphanies I was waiting for. Even after all my years of glaze geekdom, I have yet to read much of Seeger's work. While I certainly recognized his contributions, I hadn't really seen this laid out in such an elegant way.<br /><br />Almost daily, on clayart I hear folks ask how to bump their maturation of the glaze up a cone or two or down a cone. This SHOULD help them to understand how to approach their testing process. <br /><br />I guess my next question is how stability of glazes plays in to the relationships between temperatures. Ie, if a UMF ratio exists at 1:6:6.... and we increase this to read 1:5:6 I know empirically it will affect melting, but I can also surmise it will affect stability as well. Advice?Alex Sollahttps://www.blogger.com/profile/12222528761667893874noreply@blogger.com