Enhanced thermionic emission properties in textured two-phase LaB6–BaB6 system prepared by spark plasma sintering

2014 ◽  
Vol 611 ◽  
pp. 130-134 ◽  
Author(s):  
Shen Lin Zhou ◽  
Jiu Xing Zhang ◽  
Li Hong Bao ◽  
Xiao Guang Yu ◽  
Qiang Lin Hu ◽  
...  
Keyword(s):  
Spark Plasma Sintering ◽  
Thermionic Emission ◽  
Two Phase ◽  
Emission Properties ◽  
Plasma Sintering ◽  
Spark Plasma

TiPt HTSMA Produced by Spark Plasma Sintering of Elemental Powders

2013 ◽  
Vol 738-739 ◽  
pp. 579-583
Author(s):  
Silethelwe Chikosha ◽  
Hilda Kundai Chikwanda
Keyword(s):  
Spark Plasma Sintering ◽  
Processing Route ◽  
Potential Candidate ◽  
Jet Engines ◽  
Two Phase ◽  
Alternative Processing ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Added Benefit ◽  
Sintering Conditions

Titanium-platinum (Ti50Pt50) alloy has been identified as a potential candidate for high temperature shape memory alloy (HTSMA) applications such as actuators in jet engines. This work evaluates powder metallurgy as an alternative processing route with the added benefit that near net shaped components can be formed. Spark plasma sintering (SPS) of blended elemental titanium and platinum powders was carried out. The sintering conditions used were: temperatures ranging from 1200 to 1400 °C and sintering times ranging from 10 to 30 minutes. SEM with EDS, XRD and DSC were carried out to study the results. Results showed that SPS only achieved high density, but not homogenisation of the alloys. All sintering conditions resulted in formation of the martensitic TiPt phase of interest, together with some or all of the following phases: Ti, Ti3Pt, Ti4Pt3, Ti3Pt5 and Pt. Post sintering annealing treatments were carried out to homoginise the alloys at 1300 °C for times ranging from 5 to 15 hours. With sufficient annealing times a two phase microstructure was produced with TiPt as the majority matrix phase and Ti3Pt5 as the precipitate phase.

scholarly journals The Use of Spark Plasma Sintering to Fabricate a Two-phase Material from Blended Aluminium Alloy Scrap and Gas Atomized Powder

Procedia CIRP ◽  
2015 ◽  
Vol 26 ◽  
pp. 455-460 ◽  
Author(s):  
Dimos Paraskevas ◽  
Kim Vanmeensel ◽  
Jef Vleugels ◽  
Wim Dewulf ◽  
Joost R. Duflou
Keyword(s):  
Aluminium Alloy ◽  
Spark Plasma Sintering ◽  
Two Phase ◽  
Plasma Sintering ◽  
Spark Plasma

Changes in the microstructural state of Ti-Al-Nb-based alloys depending on the temperature cycle during spark plasma sintering

2021 ◽  
Vol 63 (2) ◽  
pp. 119-123 ◽  
Author(s):  
Yernat Kozhakhmetov ◽  
Mazhyn Skakov ◽  
Nuriya Mukhamedova ◽  
Sherzod Kurbanbekov ◽  
Sherzod Ramankulov ◽  
...  
Keyword(s):  
Spark Plasma Sintering ◽  
Volume Fraction ◽  
Structural Phase ◽  
Temperature Cycle ◽  
Two Phase ◽  
Structural Phase State ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
O Phase

Abstract This article presents results of the study on the dependence of the structural-phase state of alloys based on Ti-12.52Al-43.08Nb system (wt.-%) on the temperature of spark plasma sintering. It has been established that spark plasma sintering of Ti-Al-Nb alloys under the temperature of 1500 °C resulted in melting the aluminum component of the mixture that, in turn, negatively affects the quality of ready products. It has also been shown that stepping up the sintering temperature from 1000 °C to 1300 °C leads to increasing volume fraction of O-phase up to 49.63 % due to rapid precipitation of O-phase from B2-phase and Ti3Al-phase. It has been revealed that intermetallic composites obtained under the temperature of 1300 °C are characterized by a dominant two-phase В2+О structure which is more suitable for strengthening sorption properties of hydrogen-storing materials based on Ti-Al-Nb.

scholarly journals Mechanical Properties of Ti-15Mo Alloy Prepared by Cryogenic Milling and Spark Plasma Sintering

Metals ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 1280 ◽  
Author(s):  
Anna Veverková ◽  
Jiří Kozlík ◽  
Kristína Bartha ◽  
Tomáš Chráska ◽  
Cinthia Antunes Corrêa ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Spark Plasma Sintering ◽  
Milled Powder ◽  
Two Phase ◽  
High Oxygen Content ◽  
Cryogenic Milling ◽  
Plasma Sintering ◽  
Refined Microstructure ◽  
Spark Plasma ◽  
Powder Particles

Metastable β-Ti alloy Ti-15Mo was prepared by cryogenic ball milling in a slurry of liquid argon. Material remained ductile even at low temperatures, which suppressed particle refinement, but promoted intensive plastic deformation of individual powder particles. Repetitive deformation of powder particles is similar to the multidirectional rolling and resembles bulk severe plastic deformation (SPD) methods. Initial and milled powders were compacted by spark plasma sintering. Sintered milled powder exhibited a refined microstructure with small β-grains and submicrometer sized α-phase precipitates. The microhardness and the yield tensile strength of the milled powder after sintering at 850 °C attained 350 HV and 1200 MPa, respectively. Low ductility of the material can be attributed to high oxygen content originating from the cryogenic milling. This pioneering work shows that cryogenic milling followed by spark plasma sintering is able to produce two-phase β-Ti alloys with refined microstructure and very high strength levels.

Fabrication and Mechanical Properties of ultra fine WC-6wt.%Co by Spark Plasma Sintering Process

2011 ◽  
Vol 49 (01) ◽  
pp. 40-45 ◽  
Author(s):  
Hyun-Kuk Park ◽  
Seung-Min Lee ◽  
Hee-Jun Youn ◽  
Ki-Sang Bang ◽  
Ik-Hyun Oh
Keyword(s):  
Mechanical Properties ◽  
Spark Plasma Sintering ◽  
Sintering Process ◽  
Plasma Sintering ◽  
Spark Plasma
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