Jump to content


Photo

Glaze Chem Question


  • Please log in to reply
5 replies to this topic

#1 yedrow

yedrow

    Advanced Member

  • Members
  • PipPipPip
  • 405 posts

Posted 12 September 2013 - 11:11 PM

When using my glaze calc. software I've noticed that I can raise my Al/Si without it affecting my RO numbers in the unity formula. Granting that I will ultimately go out of my limits, outside of those limits is there a rule of thumb about the relationship of fluxes to non-fluxes?

 

Joel.



#2 neilestrick

neilestrick

    Neil Estrick

  • Members
  • PipPipPip
  • 2,143 posts
  • LocationGrayslake, IL

Posted 13 September 2013 - 08:52 AM

http://digitalfire.c...rmulas_206.html


Neil Estrick
Kiln Repair Tech
L&L Distributor
Owner, Neil Estrick Gallery, LLC
www.neilestrickgallery.com

neil@neilestrickgallery.com

#3 JBaymore

JBaymore

    Moderator

  • Moderators
  • 2,453 posts
  • LocationWilton, NH USA

Posted 13 September 2013 - 09:22 AM

I am assuming that you are using Flux Unity calculations (there are also other appoaches).  That concept is a core of Herman Seger's original approach....... that the sum of the fluxes always adds up to one.  The software will ALWAYS keep the fluxes set to one... no matter how you adjust the Al/Si ratio.

 

Some glaze software allows you to change the calculation approach to other options (like Insight).

 

There ARE "typical limits" for the amouints of Alumina and Silica that a given cone level glaze has in it.  You should be able to find references for them.  For example, Insight has a number of these "Target" formula tables in it for various cone ranges and types of glazes.

 

best,

 

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


John Baymore
Immediate Past President; Potters Council
Professor of Ceramics; New Hampshire Insitute of Art

http://www.JohnBaymore.com

#4 PeterH

PeterH

    Advanced Member

  • Members
  • PipPipPip
  • 150 posts

Posted 13 September 2013 - 05:04 PM

yedrow,

 

If you keep the type of flux constant and vary the alumina and silica in this fashion:

http://tinyurl.com/qfu6bxw

 

The glaze changes something like this:

http://tinyurl.com/p9regef

 

I can provide a couple of references if you want them.

 

Regards, Peter

 



#5 Biglou13

Biglou13

    Advanced beginner pottery, Advanced in other art

  • Members
  • PipPipPip
  • 725 posts
  • LocationNorth Florida

Posted 13 September 2013 - 07:07 PM

curse you guys....

(actually thanks)

 

ive spent over an hour already trying to understand this

 

http://digitalfire.c...lp/formanal.htm


Caution big brother is watching.
The beige is blinding!!!!!!
The middle of the road is boring

The true sign of intelligence is not knowledge but imagination.
-Albert Einstein

#6 yedrow

yedrow

    Advanced Member

  • Members
  • PipPipPip
  • 405 posts

Posted 13 September 2013 - 08:16 PM

Thanks guys, that was extremely helpful. That chart was great Peter! I was kinda getting it, then Biglou posted that link with perfect timing. By going back to the Seger formula on paper I saw the relationship between the alumina and silica to the fluxes as numbers.

 

Thanks again.

 

Joel.






0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users