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Popping noises
I am very concerned about the noises I heard. I noticed popping and
crackling when I opened the lid at around 100 F. I closed the lid and waited a while. I eventually unloaded at 92 F. I can't imagine that the noises are from cooling too fast except that the outside temp was cooler than the kiln temp but other than that the kiln had been cooling for 36 hours. It seems as though my temp readout and the actual temp don't agree b/c the kiln fired hotter than it should have (the 7 cone melted) but the readout was correct for ^6. I didn't have a problem with the bisque fire so I wasn't expecting any problems with the glaze fire----as far as temp goes anyways. I used the cones for good measure, but I didn't check them like I should----LESSON LEARNED. Anyways, does anyone know what the noises are? LMac |
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#3
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Thank you very much for clearing that up for me.
LMac On Mon, 28 Jul 2003 08:58:13 +1200, "annemarie" wrote: "Lindsay MacArthur" wrote in message .. . What type of structural damage can the crazing cause? Can this really be caused by a 15-20 degree temp difference (the kiln was 92 F and the outside temp was about 75-80 F when I unloaded)? LMac Crazing is not caused by a temperature drop it is caused because the clay body and the glaze do no fit properly. It is not caused by unloading a warm kiln. Remember this stuff should be oven proof. For an example - The art society I belong to about 5 - 6 years ago was having a lot of trouble with crazing, my goodness I sure heard the pinging sound, it could go on for ages. A lot of people there believed it was because of unloading a warm kiln and tried letting the kiln cool to room temperature. This of course did no good at all. They were mostly using a commercial clear glaze over underglaze decoration. I thought it was more to do with the temperature they were firing to and was lucky to attend a workshop run by a man called Royce McGlashen a master potter and also supplier of clay. The problem was we were firing too low for the clay we were using and it was causing stress between the clay and the glaze which resulted in the crazing. We lifted our firing temp and the problem dissapeared. Crazing if it is extreame can cause a pot to break but usually just leaves fine cracks in the glaze, which some people actually want for some things, especially in raku firing and it is then called "crackle glaze" However crazed ware is not food safe. Good luck Annemarie |
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