Sintered artefacts and the like

摘要

A fired refractory artefact with a fine matrix of apertures is manufactured by stacking layers of low ash paper with intervening layers of composite plastics material in sheets. The composite plastics material comprises powdered refractory material and a binder. The composite plastics material sheets are connected by ribs or walls of the composite plastics material formed, for example, in slots cut in the paper layers. The plastics material is cured and the artefact fired after burning off the paper.