公开(公告)号：US4111705A

公开(公告)日：1978-09-05

申请号：US675458

申请日：1976-04-09

申请人： July Moiseevich Junovich ,  Sergei Semenovich Zhukovsky ,  Lev Girshovich Sudakas ,  Ljudmila Ivanovna Turkina ,  Anatoly Ilich Smirnov ,  Abram Moiseevich Lyass ,  Sergei Dmitrievich Teplyakov

发明人： July Moiseevich Junovich ,  Sergei Semenovich Zhukovsky ,  Lev Girshovich Sudakas ,  Ljudmila Ivanovna Turkina ,  Anatoly Ilich Smirnov ,  Abram Moiseevich Lyass ,  Sergei Dmitrievich Teplyakov

IPC分类号： B22C1/16 ,  B28B7/34

CPC分类号： B22C1/16

摘要： A self-hardening moulding mixture for making foundry moulds or cores, comprising moulding sand, orthophosphoric acid, a ferrous oxide-containing material, a water-soluble salt of an alkali metal or ammonium, and a carboxylic acid having one dissociation constant not exceeding 10.sup.-4 or a water-soluble salt of an alkali metal or ammonium, and an isopolyacid formed by a chromium subgroup metal, manganese oxide or urea.The self-hardening moulding mixture can also comprise a surface-active substance acting as a foaming agent in order to render the mixture to a fluid state and to avoid compacting when producing moulds and cores therefrom.The moulding mixture features an enhanced bench life (10-15 min) and ensures a sufficiently high hardening and strength rates (compression strength is equal to 10-25 kg/cm.sup.2) for the foundry moulds and cores produced therefrom.