Blowing Glass Inside Ceramic Pot: Second Attempt

Ceramic forms before blowing glass inside
Pot on the left is coated on the inside with kiln wash

The first two cracked like I had suspected. So, for the next two, I set the annealing temperature to 1285 degrees. This would give the ceramic a chance to draw out even more moisture and get to a closer temperature of the glass that was being blown into it.

The second time was more successful. Only one piece cracked and the other one survived. I continued this once more and had the same results. I am researching the difference of coefficient of expansion between the glass and ceramic as they shrink and cool and different rates. I want the glass to stick to the ceramic without it becoming loose. I am thinking about mixing my own clay body in order to get better results with the annealing of the glass. I will make my pots thinner next time so that it heats quicker and is able to adhere to the glass more efficiently. This experiment was a great learning experience. I was aware that the pots would probably crack and knew that this would be a long process of experimentation and research. I am interested in making functional and sustainable planters. I will continue to experiment blowing glass into ceramic vessels without focusing too much on the form or shape at first but more on the technical aspect of getting the two materials to amalgamate together into one, coefficient piece. Once I am able to make the two materials work together, I can then focus on the design aspect. I will continue to experiment with this process while trying out several different techniques.