Assessment of a powder metallurgical processing route for refractory metal silicide alloys

2005 ◽  
Vol 36 (3) ◽  
pp. 515-523 ◽  
Author(s):  
P. Jéhanno ◽  
H. Kestler ◽  
A. Venskutonis ◽  
M. Böning ◽  
M. Heilmaier ◽  
...  
JOM ◽  
1999 ◽  
Vol 51 (4) ◽  
pp. 32-36 ◽  
Author(s):  
B. P. Bewlay ◽  
M. R. Jackson ◽  
P. R. Subramanian

2008 ◽  
Vol 1128 ◽  
Author(s):  
David M. Herman ◽  
Bernard P Bewlay ◽  
Laurent Cretegny ◽  
Richard DiDomizio ◽  
John Lewandowski

AbstractThe fracture and fatigue behavior of refractory metal silicide alloys/composites is significantly affected by the mechanical behavior of the refractory metal phase. This paper reviews some of the balance of properties obtained in the alloys/composites based on the Nb-Si system. Since some of the alloy/composite properties are dominated by the behavior of the refractory metal phase, the paper begins with a review of data on monolithic Nb and its alloys. This is followed by presentation of results obtained on Nb-Si alloys/composites and a comparison to behavior of some other high temperature systems.


2007 ◽  
Vol 534-536 ◽  
pp. 189-192 ◽  
Author(s):  
Kazuo Isonishi

Fabrication of Fe3AlC matrix in-situ composite, reinforced by a FeAl phase, was studied by using the powder metallurgical processing route. Especially, in order to disperse the second phase more finely, we chose the mechanical alloying process. We investigated the microstructural and mechanical properties of the consolidated material. After consolidation by vacuum hot pressing, the compact showed almost full density and consisted of a Fe3AlC matrix and FeAl second phase (average particle size was less than 1μm). The compact showed HV746, which was higher than that of the arc melted Fe3AlC monolithic material, HV650.


1985 ◽  
Author(s):  
Nobuyoshi NATSUAKI ◽  
Kiyonori OHYU ◽  
Tadashi SUZUKI ◽  
Nobuyoshi KOBAYASHI ◽  
Naotaka HASHIMOTO ◽  
...  

1986 ◽  
Vol 71 ◽  
Author(s):  
M. O. Aboelfotoh

AbstractMeasurements of Schottky-barrier heights in the temperature range 175-295 K for refractory metal-silicon and corresponding silicide-silicon interfaces are presented. Refractory metal silicide formation is shown to have only a small effect on the barrier height. The n-type and p-type barrier heights for both the metal and the reacted silicide phase are shown to decrease with increasing temperature with the stun equal, within the experimental accuracy, to the indirect energy gap of silicon at any measured temperature. These results indicate that the temperature dependence of the barrier heights is mainly due to that of the indirect energy gap in the silicon.


1989 ◽  
Vol 158 ◽  
Author(s):  
W.T. Anderson ◽  
A. Christou ◽  
P.E. Thompson ◽  
J.L. Davis ◽  
C.R. Gossett ◽  
...  

ABSTRACTLaser annealed refractory metal gates and Ohmic contacts have been developed for GaAs FETs and HEMTs fabricated on MBE layers grown on laser desorbed substrates. Amorphous refractory metal silicide films were sputter deposited by a method in which the RF power to separate refractory metal and silicon targets were set at predetermined deposition ratesand the substrates were rotated with respect to the sputter targets receiving a 0.2 to 0.5 nm film on each pass. The gate resistance was reduced and Ohmic contacts formed by pulsed excimer laser annealing.


1990 ◽  
Vol 26 (1) ◽  
pp. 62-64 ◽  
Author(s):  
W.T. Anderson ◽  
A. Christou ◽  
P.E. Thompson ◽  
C.R. Gossett ◽  
J.M. Eridon ◽  
...  

Minerals ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1078
Author(s):  
Nickolaj N. Rulyov ◽  
Lev O. Filippov ◽  
Dmytro Y. Sadovskyi ◽  
Vitalina V. Lukianova

Magnetite is an essential iron-bearing mineral. The primary method of magnetite ore beneficiation involves successive steps of crushing, grinding, and magnetic separation. Reverse cationic flotation is used at the final stage to remove silicate and aluminosilicate impurities from the magnetite concentrate and reduce silica content to 1–3%, depending on metallurgical processing route (electrometallurgy, direct iron reduction). In view of the stringent demands of the magnetite concentrate grade, before flotation, the ore is currently routinely ground down to a particle size below 35 µm, and magnetite particles are ground to a size below 10 µm. This significantly reduces the efficiency of flotation and increases iron loss in the tailings due to the hydraulic report in froth being up to 15–25%. Combined microflotation (CMF) looks to be a promising method of increasing fine-particle flotation efficiency, as it uses relatively small amounts of microbubbles alongside conventional coarse bubbles. Microbubbles act as flotation carriers, collecting gangue particles on their surface, which then coarse bubbles float. The purpose of this study is to explore the effectiveness of CMF for processing a model mixture that contained magnetite particles smaller than 10 µm and glass beads (Ballotini) below 37 µm in size when the initial iron content in the mixture was 63.76%. Commercial reagent Lilaflot 821M was used as both collector and frother. The flotation procedure, which included the introduction of 15 g/t of the collector before the start of flotation, and the addition of 5 g/t of the collector in combination with a microbubble dose of 0.018 m3/t 6 min after starting flotation, ensured an increase in the concentrate grade to 67.63% Fe and iron recovery of 91.16%.


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