Compositions and methods for foundry cores in high pressure die casting

The invention relates to "lost" cores for use high pressure die casting, the cores preferably comprising a water-soluble synthetic ceramic aggregate having an appropriate strength and tolerance for various casting pressures and temperatures, an inorganic binder comprising sodium silicate, an additive comprising particulate amorphous silicon dioxide, and a refractory coating, wherein the cores havethe capacity to be removed from a casting by dissolution with water. 本发明涉及用于高压模铸的"损失"型芯，该型芯优选包含具有对各种浇铸压力和温度来说合适的强度和耐受性的水溶性合成陶瓷骨料、包含硅酸钠的无机粘结剂、包含颗粒状无定形二氧化硅的添加剂和耐火涂层，其中该型芯具有通过用水溶解而被从铸件移除的能力。