Metal casting runner - has an abrasion resistant outer layer of silica and alumina

摘要

A casting runner or channel comprises a rigid substrate in which is located a refractory substance. The refractory substance includes inter alia highly thermally resistant fibres and a binder and is coated with a layer of a substance highly resistant both to abrasion and corrosion, there being a layer of a coloured material between teh refractory substance and the abrasion and corrosion resistant layer. To transfer liquid metal from the melting stage to the refining stage or from the refining stage to the casting stage. The runner has an improved wear resistance and life as well as being of simpler construction than conventional runners.