Version 2 of an ongoing research and experimentation project to explore homemade refractory materials.
Perlite was chosen as an insulating aggregate, but it can’t hold up on its own, here I coat the particles in aluminum oxide which can take the heat, all glued together with sodium silicate.
In this usage, the perlite is used to make an alumina forge lining less dense and more insulating. The perlite is sacrificial, it can melt within the alumina shell with no adverse affect, as it has done its job by bulking up the alumina, which alone conducts heat more than is ideal for a forge lining.
Music from YouTube library
Post time: 05-07-2017