Method for producing foundry moulds, preferably layered foundry moulds for the investment casting engineering

摘要

process for the production of foundry moulds, especially stratified foundry moulds for foundries precision, is making layers of liquid ceramic paste on model casting, drying and subsequent layers of form removal model and firing forms.way is characterized by the fact that at least one layer made of liquid ceramic paste containing binder and composition for loose materials consisting in% by weight of 20 to 65% ceramic material, 8 - 20% of a reactive metal, preferably al about grain size 0 - 0, 3 mm, 25 - 60% of metal oxides, preferably fe2o3 or fe3o4,0 - 10% activators exothermic reaction kclo4 favourably, and / or nano3 and / or kno3 and / or stop almg, whereby the quantity of binder composition contains quantities of loose materials within 1: 0.75 to 1: 4.5, and then after the removal model and after drying, the form is heated to temperatures y initiate exothermic reaction, and thereafter, cooling to form.the glue is aqueous or hydroalcoholic or aqueous acetone solution containing tlenkowu0105 colloidal substance, preferably sio2 or al2o3 or zro2.