Foundry core with improved gutting properties II

摘要

The foundry core comprises sand such as quartz sand, aluminum oxide-based sand and/or mullite-based sand, organic binder or binder mixture, and hydrophobic aerogel granules such as oxidic aerogel granules, which have a grain size distribution in the order of magnitude of the sand. The sand and/or the aerogel granules have a grain size distribution of 0.1-0.9 mm. The aerogel granules have a grain size of = 0.5 mm. The portion of aerogel granules is 8-12 vol.%. The portion of aerogel granules in the core is 0.13-0.19 wt.%. An independent claim is included for a method for producing a foundry core.