iandol on thu 16 nov 00
Dear Cameron,
Thank you for those insights into industrial glaze technology. I am =
amazed that such information could be lost to a commercial system. Year =
ago I worked in Big Steel. The son of the founder of the firm was one of =
the first people to every start doing metallurgical research in the late =
1800s. He discovered the effects of Manganese on the properties of =
steel. Apparently he had alloyed almost every element, including gold =
and platinum with iron, looking for a commercial advantage. The labs had =
all his original specimens in vaults and his original papers were in the =
library. Those people had a shrewd evaluation of hard won knowledge. =
Nothing was ever thrown away and everything was counted.
Regarding your information. I would allow more time for the gas to =
evolve, either by slowing the heating, holding longer at temperature or =
shallow ramping down if I did wish to remove it from the product. Having =
eliminated gassing from the clay and the absence of Carbonates in the =
mixtures as causes, my inquisitiveness centred on chemical rather than =
the physical origins of the gas bubbles. In Ceramic Glazes, Parmelee, in =
his discussion of defects, suggests that bubbles in some glazes might =
contain Oxygen, generated by the decomposition of iron and other =
metallic oxides.
Thank you for joining in on this discussion and best regards,
Ivor.
Cameron Harman on thu 16 nov 00
Dear Ivor,
Thank you for your thoughtful comments. I agree that it is
shocking that good work done in the past is often ignored by
future generations, after all the laws of physics don't change
with every generation (even if we do not fully understand the why
and wherefore of them).
Regarding Parmalee's book. The entire revision was written by my
father as was a good bit of the original edition. Since Parmalee
was department head and dad was only an associate professor,
Cullen Parmalee felt that it was not appropriate to put any one
else's name on the origonal work.
I understand your interest in knowing what might serve as causes
for the bubbles, it is both interesting and useful.
Cameron
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