FORFARANDE FOR FRAMSTELLNING AV EN KROPP AV HOGGRADIGT GENOMTRENGLIGT KERMAISKT METERIAL, VILKEN INOM SPECIFIKA OMRADEN ER BELAGD MED ETT OGENO MTRENGLIGT GLASYRSKIKT

摘要

A method of making an article of highly permeable material having on at least one surface of the article an impermeable facing layer, said method comprising: forming a pattern of organic foam material; lining a surface of the organic foam material with a layer of absorbent material; impregnating the pattern and lining with a liquid slurry of ceramic material; removing surplus slurry and drying and heating the assembly to form a ceramic foam article of large-celled structure and high permeability having a layer of fine-pored structure on the surface corresponding to the surface of the organic foam which was lined with absorbent material; applying a glazing frit to the layer of fine-pored structure; and heating to cause the frit to fuse to produce an impermeable facing.