HA-News
07.12.2006
Cordis Binder System
The aim is to use the binders in conventional core shooting machines and to decore the castings on equipment existing in the foundry, also to produce casting qualities comparable to those achieved with the organic systems currently available. The binder consists of a combination of phosphate, silicate and borate groups with further inorganic additives added to the process to further enhance the properties.
In aluminium alloys, uncoated cores can be used although coatings may be used with some loss of strength, water based coatings showing a greater loss than alcohol based coatings. Due to the hydrophilic nature of the mix, the binder solvent being water, the cores are very susceptible to high atmospheric humidity.
The environmental advantage of the process is more evident during the casting process than during the coremaking process, no fumes or odours arising during casting.
To summarise, Steve informed the meeting that the use of binders in coremaking has already reached a high degree of sophistication but calls for a new approach. He feels that the breakthrough of inorganic binders is nearing. However, the related cost and equipment requirements are not to be underestimated. The attraction of a binder system which helps to preserve the environment was such that 50 members attended, listened to a fascinating and well presented talk that resulted in a prolonged and probing discussion.