Testing Material Phase 1
In order to start testing the material I had been research about previews work in ceramic fields taking in account components to test different levels of porosity and roughtess. By nature of its microstructure, traditional ceramic material can function as a buffer for both heat and moisture.
I am using bentonite white clay because it has been prove that has an equilibrium moisture content of 13 percent under 50 percent standard humidity conditions, whereas the equilibrium moisture content of kaolinite under the same conditions is only 0.7 percent. Desiccants in the packaging industry use a type of bentonite clay as it is easily recharged (dried out) at temperatures of 40° C according to Ceramic Perspiration Project1. Bentonite has therefore been used as the green nonfired porous material in the samples.
Introducing porosity into any material will improve the thermal insu- lating characteristics (decreasing the conductivity) of the material. Po- rous materials consist of solid matrix and gas inside the pores. Their good insulation properties are achieved due to the very small thermal conductivity in gases compared to solids or liquids. Therefore this first testing I am using pine sawdust in different proportion and chamotte to produce a rough finish to help the growing process.
Temperature and cooking time had been also limited by rock wool, this natural fibers have one the highest fusion point compare to other fibers, usually using as firesafe insulation but also as soil medium for germinating plants. These samples were fired for 8 hours at a tem- perature of 950 ° celsius.