Self-Propagating High-Temperature Synthesis (SHS): Current Status and Future Prospects.
ARMY LAB COMMAND WATERTOWN MA MATERIAL TECHNOLOGY LAB
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Conventional ceramic processing normally consists of two stages first, a powder having the desired physical and chemical characteristics is prepared, then it is heated to promote interparticle bonding sintering and densification. This generally requires high temperature 1200-2000C and controlled atmospheres vacuum - high pressure. Often the sintering stage may require up to several days to carry out. An alternative method termed Self-Propagating High-Temperature Synthesis SHS is described in this review. The process utilizes the heat generated by an exothermic reaction between precursor components to densify the resulting reaction products. The heat generated by these reactions is capable of producing temperatures in excess of 2500C. Since the heat is self-generated, high temperature furnaces are not required. Processing times are on the order of secondsminutes rather than hoursdays as in conventional processes. In addition to these attributes, products produced by SHS to be of higher purity than the starting materials since the high temperatures vaporize the volatile contaminants. Further, intractable borides and carbides can be produced by this technique.
- Ceramics, Refractories and Glass