composição de revestimento de fundição, processo para a preparação de um molde ou núcleo de fundição revestido, e, molde ou núcleo de fundição revestido

摘要

A foundry coating composition for moulds and cores, a process for preparing coated foundry moulds and cores, and coated moulds and cores obtainable by the process. The foundry coating composition comprises a liquid carrier; a binder; and a particulate refractory filler. The particulate refractory filler comprises a first (relatively coarse) fraction having a particle size of d>38µm and a second (relatively fine) fraction having a particle size of d<38µm. No more than 10% of the total particulate refractory filler has a particle size of 38µm38µm) and an absorbed coating (comprising particles of d<38µm).