An inert gas is routinely used to prevent oxidation during selective laser sintering. Such glazes are generated by sintering a compacted oxide layer. The study of sintering in metallurgy powder-related processes is known as powder metallurgy. UHMWPE is processed variously by compression moulding, ram extrusion, gel spinning, and sintering. The chromium acts to stabilize the iron oxide and prevents sintering. Several of these materials require processing such as baking or sintering following their milling. Their materials were synthesized using vacuum sintering techniques. Such electrodes were produced by scattering and subsequent sintering or hot pressing. The upper temperature limit is due to the susceptibility of copper to thermal sintering. Alnico magnets are produced by casting or sintering processes. The kiln has only to raise the feed to sintering temperature. The reaction proceeds via liquid phase sintering. The ceramics can be created by pressureless sintering or hot pressing. Over time, accumulated snow metamorphoses, by sintering, sublimation and freeze-thaw. The process begins with a downdraft sintering operation.