Fabrication of fully dense ZrB2- and HfB2-based Ultra High Temperature Ceramics by combining Self-propagating High-temperature Synthesis and Spark Plasma Sintering

LICHERI, ROBERTA;ORRU', ROBERTO;MUSA, CLARA;CAO, GIACOMO
2009

Abstract

The Self-propagating High-temperature Synthesis (SHS) technique and the Spark Plasma Sintering (SPS) technology are combined in this work for the fabrication of fully dense MB 2-SiC and MB 2-MC-SiC (M=Zr, Hf) Ultra High Temperature Ceramics (UHTCs). Specifically, Zr or Hf, B 4C, Si, and, for the cases of the ternary systems, graphite powders are first reacted by SHS to successfully form the desired compounds. The resulting powders are then subjected to consolidation by SPS. In particular, by setting a dwell temperature level equal to 1800 °C, a mechanical pressure P=20 MPa, and a non-isothermal heating time t h= 10 min, products with relative densities ≥ 98.5% are obtained for all systems investigated within 30 min of total processing time. The characteristics of the resulting dense UHTCs, i.e. hardness, fracture toughness, and oxidation resistance, are similar to, and in some cases superior than, those related to analogous products synthesized by alternative, less rapid, methods.
Inglese
Chemical Engineering Transactions, proceedings of ICheaP-9, the 9th International Conference on Chemical and Process Engineering
978-889560801-3
Sauro Pierucci Editor
17
1705
1710
6
ICheaP-9, the 9th International Conference on Chemical and Process Engineering
internazionale
4 Contributo in Atti di Convegno (Proceeding)::4.1 Contributo in Atti di convegno
Licheri, Roberta; Orru', Roberto; Musa, Clara; Cao, Giacomo
273
4
4.1 Contributo in Atti di convegno
none
info:eu-repo/semantics/conferenceObject
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