Comparison of Reactive and Non-Reactive Spark Plasma Sintering Routes for the Fabrication of Monolithic and Composite Ultra High Temperature Ceramics (UHTC) Materials
| Autor: | Giacomo Cao, Roberto Orru |
|---|---|
| Rok vydání: | 2013 |
| Předmět: |
carbides
Fabrication Materials science Composite number Self-propagating high-temperature synthesis Spark plasma sintering Sintering Review engineering.material lcsh:Technology Carbide mechanical activation General Materials Science Ceramic Composite material lcsh:Microscopy ultra high temperature ceramics lcsh:QC120-168.85 lcsh:QH201-278.5 lcsh:T Metallurgy Ultra-high-temperature ceramics self-propagating high-temperature synthesis borides lcsh:TA1-2040 visual_art visual_art.visual_art_medium engineering lcsh:Descriptive and experimental mechanics lcsh:Electrical engineering. Electronics. Nuclear engineering lcsh:Engineering (General). Civil engineering (General) lcsh:TK1-9971 spark plasma sintering |
| Zdroj: | Materials Materials, Vol 6, Iss 5, Pp 1566-1583 (2013) |
| ISSN: | 1996-1944 |
| DOI: | 10.3390/ma6051566 |
| Popis: | A wider utilization of ultra high temperature ceramics (UHTC) materials strongly depends on the availability of efficient techniques for their fabrication as dense bodies. Based on recent results reported in the literature, it is possible to state that Spark Plasma Sintering (SPS) technology offers a useful contribution in this direction. Along these lines, the use of two different SPS-based processing routes for the preparation of massive UHTCs is examined in this work. One method, the so-called reactive SPS (R-SPS), consists of the synthesis and densification of the material in a single step. Alternatively, the ceramic powders are first synthesized by Self-propagating High-temperature Synthesis (SHS) and then sintered by SPS. The obtained results evidenced that R-SPS method is preferable for the preparation of dense monolithic products, while the sintering of SHS powders requires relatively milder conditions when considering binary composites. The different kinetic mechanisms involved during R-SPS of the monolithic and composite systems, i.e., combustion-like or gradual solid-diffusion, respectively, provides a possible explanation. An important role is also played by the SHS process, particularly for the preparation of composite powders, since stronger interfaces are established between the ceramic constituents formed in situ, thus favoring diffusion processes during the subsequent SPS step. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|