2016
DOI: 10.1016/j.jeurceramsoc.2016.05.014
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Effect of sintering techniques on the microstructure and mechanical properties of niobium borides

Abstract: a b s t r a c tThis study reports on the consolidation of niobium boride powders by cold pressing/pressureless sintering (PS, with or without Co addition) and spark plasma sintering (SPS) techniques. Niobium boride powders (containing NbB, Nb 3 B 4 and NbB 2 phases) which were mechanochemically synthesized from Nb 2 O 5 , B 2 O 3 and Mg blends and purified by HCl leaching were used as precursor material. The effects of different sintering techniques on the consolidation behaviour, microstructure, densification… Show more

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Cited by 19 publications
(12 citation statements)
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“…The value of Young's modulus measured for sample #98 is slightly higher than for the other composites evaluated in this study. It is well documented that monolithic TiB 2 should have Young's modulus around 565 GPa, whereas the data for bulk NbB 2 range between 539 and 550 GPa . Hence it is thought that phase distribution, grain size, and porosity lower the estimated elastic modulus in this study.…”
Section: Resultsmentioning
confidence: 69%
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“…The value of Young's modulus measured for sample #98 is slightly higher than for the other composites evaluated in this study. It is well documented that monolithic TiB 2 should have Young's modulus around 565 GPa, whereas the data for bulk NbB 2 range between 539 and 550 GPa . Hence it is thought that phase distribution, grain size, and porosity lower the estimated elastic modulus in this study.…”
Section: Resultsmentioning
confidence: 69%
“…As a quest for higher performance and understanding of the processes behind high‐temperature (HT) behavior of UHTCs continues, hence it is logical that studies concerning other less studied diborides such as NbB 2 are emerging . Previous studies on the monocrystalline niobium diboride showed that high hardness can be retained up to 1100°C .…”
Section: Introductionmentioning
confidence: 99%
“…The applied high electric current provides a local increase in the temperature at the particle contacts which significantly enhances the diffusivity of the powders and accelerates the densification [29,33]. Similar SPS conditions (1500°C for 15 min under pressure of 60 MPa) were employed for the consolidation of mechanochemically synthesized niobium boride powders; however, a complete densification could not be obtained [34]. This is most likely due to the phase transformation occurred during SPS after which unstable and secondary phases of niobium borides were formed [34].…”
Section: Phase and Microstructural Analyses Of The Sintered Productmentioning
confidence: 99%
“…Similar SPS conditions (1500°C for 15 min under pressure of 60 MPa) were employed for the consolidation of mechanochemically synthesized niobium boride powders; however, a complete densification could not be obtained [34]. This is most likely due to the phase transformation occurred during SPS after which unstable and secondary phases of niobium borides were formed [34]. Thus, the phase stability during the SPS of metal boride powders may be the key factor for high densification rates [34].…”
Section: Phase and Microstructural Analyses Of The Sintered Productmentioning
confidence: 99%
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