Influence of yttria additions on the oxidation behaviour of titanium prepared by powder metallurgy

Pérez, P.; Salmi, G.; Muñóz, A.; Monge, M.A.

doi:10.1016/j.scriptamat.2009.02.040

Cited by 9 publications

(6 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…5. At 973 and 1073 K, thick scales with a stratified structure grew in all materials, up to 1.6 mm in thickness for W-PM oxidized at 973 K for 100 h. The stratified structure is similar to that reported during oxidation of pure titanium in air [14]. Unlike rutile scale formed on titanium, each individual layer/stratum was separated from adjacent layers by interconnected cavities instead of a continuous cracking.…”

Section: Resultssupporting

confidence: 76%

Influence of processing route and yttria additions on the oxidation behavior of tungsten

Cifuentes¹,

Muñóz²,

Monge³

et al. 2013

Journal of Nuclear Materials

Self Cite

View full text Add to dashboard Cite

Abstract:The oxidation resistance in dry air of pure tungsten and tungsten reinforced with a dispersion of 0.6 wt.%Y 2 O 3 nanoparticles has been evaluated between 873 and 1073 K, temperature range that divertor in fusion power plants should endure during long-term times in the case of loss of coolant accident and/or air ingress in the vessel. Both materials were prepared by a powder metallurgy route involving hot iso-static pressing of ball milled tungsten powders and tungsten with dispersed Y 2 O 3 nanoparticles. The results have been compared with those of pure tungsten processed by conventional techniques. Thermo-gravimetric tests at 873 K revealed that the processing route as well as yttria addition considerably affected the oxidation resistance of pure tungsten. Mass gain of W-0.6Y 2 O 3 at 873 K was five and two times lower than that of pure tungsten prepared by conventional processing techniques and by powder metallurgy, respectively. This different behavior was related to changes in the structure and composition of the oxide scale. Above 873 K, the kinetics were significantly accelerated for all materials due to the development of a non-protective oxide scale from the earliest oxidation stages, although the kinetics of Y 2 O 3 -containing material were still the slowest, specially at 973 K. It was analyzed how yttria additions modify the oxidation mechanism of tungsten.

show abstract

Section: Resultssupporting

confidence: 76%

Influence of processing route and yttria additions on the oxidation behavior of tungsten

Cifuentes¹,

Muñóz²,

Monge³

et al. 2013

Journal of Nuclear Materials

Self Cite

View full text Add to dashboard Cite

show abstract

“…It was reported, however, that Y 2 O 3 particles significantly improved the oxidation resistance of W al loys [15,19] and W Y 2 O 3 alloys were able to enhance the high tem perature strength retention of W. The same phenomenon is observed in the case of W Ti alloys, and the W 4Ti 0.5Y 2 O 3 alloy overcame the mechanical performance of the W 4Ti counterpart at 800 °C even though they presented inferior strength and tough ness at ambient temperature. The W 2Ti 0.5Y 2 O 3 , whose proper ties did not improve very much with temperature, presented excellent strength retention at high temperature, and its behavior at 800 °C and above was better than that of the W 4Ti alloy.…”

Section: Mechanical Properties and Failure Micromechanismsmentioning

confidence: 96%

“…A Y 2 O 3 dispersion, apart from strengthening the matrix and inhibiting grain growth, enhances oxidation resistance. In particular, it has been found that 0.5 wt.% Y 2 O 3 addition remarkably enhances the oxidation resis tance of PM W [17,19] with sizes between 10 nm and 50 nm. The powder blends with the target compositions were milled inside a WC vessel sealed under a high purity Ar atmo sphere, for 2 h in a high energy planetary mill using WC balls of 10 mm in diameter as grinding media.…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties of Y2O3-doped W–Ti alloys

Aguirre

Martı́n

Pastor

et al. 2010

Journal of Nuclear Materials

Self Cite

View full text Add to dashboard Cite

W and W alloys are currently considered promising candidates for plasma facing components in future fusion reactors but most of the information on their mechanical properties at elevated temperature was obtained in the 1960s and 1970s. In this investigation, the strength and toughness of novel Y 2 O 3 doped W Ti alloys manufactured by powder metallurgy were measured from 25 °C up to 1000 °C in lab oratory air and the corresponding deformation and failure micromechanisms were ascertained from anal yses of the fracture surfaces. Although the materials were fairly brittle at ambient temperature, the strength and toughness increased with temperature and Ti content up to 600 °C. Beyond this tempera ture, oxidation impaired the mechanical properties but the presence of Y 2 O 3 enhanced the strength and toughness retention up to 800 °C.

show abstract

“…Rutile and brookite peaks were detected in the surface of both instruments showing greater peaks in Reciproc Blue instruments. The rutile and brookite phases are variants of TiO2 produced as a result of heat treatment (38). Reciproc Blue instruments receive heat treatment at high temperatures causing the formation of an oxide layer on the surface giving the instruments its blue colour.…”

Section: Discussionmentioning

confidence: 99%

Metallurgical characterisation and torsional resistance of blue thermomechanically treated nickel titanium instruments after simulated ex vivo retreatment procedure

et al. 2021

View full text Add to dashboard Cite

To compare used and unused Reciproc Blue and Reciproc after retreatment, the instruments were used in the mesiobuccal canals of maxillary molars with curvature. The torsional resistances were tested and then unused instruments were subjected to XRD, DSC and microhardness tests. Student's t, ANOVA and Tukey's tests were performed (α-level 0.05). The torsional strength of used Reciproc Blue was not significantly different than unused ones (P > .05), while torsional strength of Reciproc decreased significantly (P < .05). DSC and XRD indicated that Reciproc Blue exhibited prominent transformation peaks corresponding austenite to R-phase. Microhardness of Reciproc was significantly higher (P < .05). A second reuse of Reciproc Blue for retreatment could be considered safe in terms of torsional strength. Blue treatment also decreased surface microhardness of the instrument and changed phase composition by increasing the R-phase.

show abstract

Influence of yttria additions on the oxidation behaviour of titanium prepared by powder metallurgy

Cited by 9 publications

References 14 publications

Influence of processing route and yttria additions on the oxidation behavior of tungsten

Influence of processing route and yttria additions on the oxidation behavior of tungsten

Mechanical properties of Y2O3-doped W–Ti alloys

Metallurgical characterisation and torsional resistance of blue thermomechanically treated nickel titanium instruments after simulated ex vivo retreatment procedure

Contact Info

Product

Resources

About