Self-Propagating High-Temperature Synthesis (SHS): Current Status and Future Prospects.
Abstract
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 (1200-2000'C) 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 2500'C. Since the heat is 'self-generated,' high temperature furnaces are not required. Processing times are on the order of seconds/minutes rather than hours/days 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.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1986
- Accession Number
- ADA169588
Entities
People
- James W. McCauley
- Normand D. Corbin