Five Minute LOI Test
نویسندگان
چکیده
Loss-on-ignition (LOI) is an important thermo-chemical property test for many foundry materials. Applications include new sands, green sand systems, chemically bonded cores and molds, sand additives, and reclaimed sands. LOI has been an important quality control measure carried out off-line. The AFS-defined LOI test uses a muffle furnace that is time consuming, often requiring three hours; a modified method, using a microwave furnace, provides results in about 20 minutes. With faster testing and analyses LOI can serve as a process control tool. Now a new, faster LOI method has been developed at Western Michigan University. It uses induction heating and a metallic crucible. It can produce test results in less than five minutes without sacrifice of accuracy. In addition, the new technique has a data acquisition system that allows real time analysis of sample mass change as a function of time and temperature that can be graphically represented. The acquired data can be saved for further analysis, comparison, and record keeping. Test procedures are explained and the equipment needed is shown in schematic drawings and photos.
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