Tham khảo tài liệu 'foseco non-ferrous foundryman’s handbook part 5', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 68 Foseco Non-Ferrous Foundryman s Handbook B Figure Dimensions of INSURAL ATL one piece ladle liners Table . Figure Temperature loss with INSURAL ladle lining system. INSURAL refractory for ladles and metal transport 69 Benefits from using the INSURAL ATL ladle lining system for aluminium are Gas consumption is reduced significantly by up to 90 compared to conventional ladle practice which requires preheating Lower melting furnace temperatures Clean oxide-free ladles INSURAL ATL linings provide a clean easily installed system offering significant energy and cost savings. A full range of linings is available from 10 kg to 1000 kg in capacity Table . Figure shows typical temperature losses with the INSURAL Ladle Lining System. When particularly high erosion is found such as where metal is to be poured from a great height or at a very fast rate linings can be supplied with reinforced bases made from a FOSCAST material. INSURAL preformed launders are used in foundries both for tapping from the melting furnaces and for the short launders feeding the holding furnaces used at each diecasting machine in a pressure diecasting foundry. The non-wetting properties of INSURAL ensure that only thin skulls of metal are left after each pour. These are easily removable leading to low non-recoverable metal losses. Chapter 6 Treatment of aluminium alloy melts Introduction Before casting aluminium alloys the molten metal must be treated in order to Degas Molten aluminium contains undesirable amounts of hydrogen which will cause porosity defects in the casting unless removed Grain refine Mechanical properties of the casting can be improved by controlling the grain size of the solidifying metal Modify The microstructure and properties of alloys can be improved by the addition of small quantities of certain modifying elements There are various ways of carrying out these treatments the older methods involve the addition of tablets or special fluxes to the melt in a .
