Spark plasma synthesis and densification of TaB 2 by pulsed electric current sintering

The synthesis and consolidation in one processing step of single phase tantalum diboride by Spark Plasma Sintering (SPS) is proposed. TaB 2 formation from Ta and B elemental powders takes place at about 800 °C through a solid-state combustion reaction while product densification requires higher temp...

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Bibliographic Details
Published inMaterials letters Vol. 65; no. 19; pp. 3080 - 3082
Main Authors Musa, Clara, Orrù, Roberto, Licheri, Roberta, Cao, Giacomo
Format Journal Article
LanguageEnglish
Published Elsevier B.V 2011
Subjects
Reactive sintering
SPS
Tantalum diboride
Reactive sintering
SPS
Tantalum diboride
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Summary:The synthesis and consolidation in one processing step of single phase tantalum diboride by Spark Plasma Sintering (SPS) is proposed. TaB 2 formation from Ta and B elemental powders takes place at about 800 °C through a solid-state combustion reaction while product densification requires higher temperatures. Consolidation is significantly improved (~ 96% density) when increasing the applied pressure from 20 to 60 MPa immediately after the synthesis reaction occurs. Simplicity, short duration, milder temperatures and pressure conditions, in comparison with other routes utilized so far for obtaining bulk TaB 2 are, along with the good mechanical properties of the obtained product, the main benefits of the adopted approach. ► Refractory borides for high-temperature structural applications. ► Reactive Spark Plasma Sintering of tantalum diboride. ► Fully dense products after a two-steps mechanical pressure cycle.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2011.06.094