NCECA 2014: James Ferrante
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Transcript of NCECA 2014: James Ferrante
• Texas A&M – Corpus Christi
• Louis Katz (he is in Thailand)
• please vote for me for SDAL
Use of Soluble Salts as Surface TreatmentsJames (Alex) Ferrante
Needed vocabulary:
– Soluble in water: breaks down in water to form a homogenous liquid , like salt or sugar
– The solubility in water: The amount of material that can be held in solution
– Saturated solution: A solution that has the maximum amount dissolved in it.
• Use of Soluble Salts as surface treatments
• CaCl2 Calcium Chloride
• MgSO4 Epsom Salts
• Al2(SO4)3 Aluminum Sulphate
• FeSO4 Iron Sulphate a.k.a. Copperas, Ferrous Sulphate
Sources
•CaCl2 Calcium Chloride – Ice Melt (cheap), Damp Rid $$
•MgSO4 Epsom Salts -Pharmacy
•Al2(SO4)3 Aluminum Sulphate- Nursery
•FeSO4 Iron Sulphate- Nursery
• Unusual Cone 10 Clay Bodies Sources
“Bizen Stoneware”– 1 Redart, 1 EPK, 1 C&C Ball Clay
“Newman Bizen”– 1 Newman, 1 EPK, 1 C&C Ball Clay
Wadding– 50 Kaolin, 50 White Sand
Straight Kentucky Stone– Is going to have a high drying shrinkage
Straight Green Stripe– Worried about Cristobalite
Straight Newman Red Substitute– To much thermal expansion for normal cone 10
glazes, it cracks.
Simple punky white bodies
1.EPK 2, Silica Sand 1
2.EPK 9, Custer Spar 1
Simple Class StonewareSimple Class Stoneware
•2 Fireclay2 Fireclay
•1 ball clay1 ball clay
•10% Feldspar10% Feldspar
Scumming
•Calcium Sulphate
•Barium Carbonate
•BaCO3 + CaSO4 CaCO➜ 3 + BaSO4
Teaism
Archie Bray Brick Clay + fireclay
Suwanee Natewong, carvingNote Scumming
Teaism
Yellow/Green from Calcium scum
Yellow/Green from Calcium scum
Teaism
Less scum on the edge of Class Stoneware
Calcium Chloride Scum
Newman Clay straight Cone 6 Oxidation
Teaism
• Contact
Aluminum Sulphate& Iron Sulphate
Iron Sulphate
12 FeSO4 + 3 O2 → 4 Fe2(SO4)3 + 2 Fe2O3
Calcium Chloride can be used strong
Epsom salts cannot be used strong
Iron Sulphate Oxidizes over time. It should not be stirred.
Aluminum Sulphate is just scummy unless used on well melted bodies.
Safety 1
No eating these things.
Keep them out of your eyes. Safety Glasses.
Iron Sulphate is a poison. Iron is the largest single poisoning agent of children in the world.They make Acid vapors when fired. Vent your kiln.
• Safety 2
• Do not mix these compounds with acids, Boric Acid.....
• Consult your safety expert, and MSDS sheets. I am not a safety expert.
• They are all corrosive.
• Contacts: [email protected] [email protected]
• Handout and this powerpoint: http://louiskatz.net/salts
• http://Jamesalexanderferrante.com