Effects of Holding Time and Temperature on Sr Content of Mg-Sr Master Alloys Produced by Metallothermic Reduction of SrO

2011 ◽  
Vol 403-408 ◽  
pp. 20-23
Author(s):  
Ming Bo Yang ◽  
Hui Li ◽  
Wei Zhang ◽  
Tao Zhou
Keyword(s):  
Flow Rate ◽  
Gas Flow ◽  
Holding Time ◽  
Flow Rate Ratio ◽  
Metallothermic Reduction ◽  
Experimental Conditions ◽  
Master Alloys ◽  
Magnesium Melt ◽  
Carrier Gas Flow ◽  
Holding Temperature

In the paper, the effects of the holding time and temperature on Sr content of the Mg-Sr master alloys produced by the metallothermic reduction of SrO into magnesium melt were investigated. The results preliminarily indicated that effects of the holding time and temperature on the Sr content of the Mg-Sr master alloys produced by the metallothermic reduction of SrO into magnesium melt were relatively obvious. For a given experimental conditions: magnesium melt of ~10 kg and powder flow rate to carrier gas flow rate ratio of 20 g SrO/min / 15 L Ar/min, with the increasing of holding time from 30min to 150 min at 800 °C or holding temperature from 700°C to 850 °C for 90 min, the Sr content of the Mg-Sr master alloy increased gradually. Obviously, the long holding time or high holding temperature was beneficial to produce Mg-Sr master alloys with high Sr content by the metallothermic reduction of SrO into magnesium melt.

Investigations about Feasibility of Mg-Sr Master Alloys Production by Metallothermic Reduction of SrO

2011 ◽  
Vol 403-408 ◽  
pp. 707-711
Author(s):  
Ming Bo Yang ◽  
Hui Li ◽  
Wei Zhang ◽  
Tao Zhou
Keyword(s):  
Holding Time ◽  
Metallothermic Reduction ◽  
Technological Factors ◽  
Master Alloys ◽  
Magnesium Melt ◽  
Holding Temperature

In the paper, the feasibility of the Mg-Sr master alloys production by the metallothermic reduction of SrO into magnesium melt was investigated. The results preliminarily indicated that it was feasible to produce the Mg-Sr master alloys by the metallothermic reduction of SrO into magnesium melt. The mechanism about the production of the Mg-Sr master alloys by the metallothermic reduction of SrO into magnesium melt was possibly related to the following reaction: SrO(s) +Mg(l) =[Sr]+MgO(s) . In the further study, the effects of the technological factors such as holding time and holding temperature on the Sr content of the Mg-Sr master alloys produced by the metallothermic reduction of SrO into magnesium melt needed to be considered.

Growth rate, surface morphology, and defect microstructures of β–SiC films chemically vapor deposited on 6H–SiC substrates

1989 ◽  
Vol 4 (1) ◽  
pp. 204-214 ◽  
Author(s):  
H. S. Kong ◽  
J. T. Glass ◽  
R. F. Davis
Keyword(s):  
Growth Rate ◽  
Surface Morphology ◽  
Flow Rate ◽  
Rate Ratio ◽  
Gas Flow ◽  
Chemical Vapor ◽  
Flow Rate Ratio ◽  
Gas Flow Rate ◽  
Carrier Gas ◽  
Carrier Gas Flow

Beta–SiC thin films have been epitaxially grown on 6H–SiC {0001} substrates via chemical vapor deposition (CVD). The growth rate increased linearly with the source/carrier gas flow rate ratio. The activation energy for the growth of β–SiC grown on the Si face of the 6H–SiC substrate was 12 Kcal/mole. These observations are consistent with a surface reaction-controlled process. The as-grown surface morphology is dependent on the terminal layer of the substrate, the growth temperature, and the source/carrier gas flow rate ratio. The C face of a 6H–SiC {0001} substrate caused a higher growth rate and thus poorer surface morphology than the Si face under the same growth conditions. The optimum temperature range for growth of a flat, mirror-like β–SiC surface was determined to be 1773–1823 K in the present CVD system. The microstructure and nucleation of double positioning boundaries were investigated via transmission and scanning electron microscopies. Triangular defects and their modifications were also observed, and their origins have been discussed.

scholarly journals Estimating precision and accuracy of GC-TCD method for carbon dioxide, propane and carbon monoxide determination at different flow rate of carrier gas

2016 ◽  
Vol 70 (4) ◽  
pp. 451-459 ◽  
Author(s):  
Oman Zuas ◽  
Harry Budiman
Keyword(s):  
Thermal Conductivity ◽  
Flow Rate ◽  
Gas Flow ◽  
Thermal Conductivity Detector ◽  
Experimental Conditions ◽  
Flow Rates ◽  
Carrier Gas ◽  
Relative Standard ◽  
Precision And Accuracy ◽  
Carrier Gas Flow

Investigation on precision and accuracy of gas chromatography equipped with thermal conductivity detector (GC-TCD) method for the measurement of CO2, C3H8, and CO as pollutant models at different flow rate of helium (He) carrier gas ranging from 17.50 to 36.25 ml/min were conducted. It was found that percentage of relative standard deviation (%RSD) values for both precision an accuracy show an overall gradual decrease as the carrier gas flow rates increased up to 25 ml/min. After that, the %RSD was found to increase with a further increase in the flow rate. These findings indicate that the flow rate of 25 ml/min was found to be the most precise and accurate level among all flow rates tested under experimental conditions of this study. While the %RSD values obtained at all flow rate are given in details. Consequently, our results suggest that the flow rate of carrier gas was a determining parameter for varying the precision and accuracy of the GC-TCD method. Owing to the fact that carrier gas act as a transporter of components of the mixture in the form of vapor or gas through the column, setting of the flow rate of carrier gas should in proper level achieve a precision and accuracy of the GC-TCD method.

Influence of the Variation of Plasma Torch Parameters on Particle Melting and Solidification

1997 ◽  
Author(s):  
M. Vardelle ◽  
P. Fauchais ◽  
A. Vardelle ◽  
A.C. Léger
Keyword(s):  
Flow Rate ◽  
High Speed ◽  
Gas Flow ◽  
Operating Conditions ◽  
Characteristic Parameters ◽  
Powder Mass ◽  
Arc Current ◽  
Plasma Sprayed ◽  
Carrier Gas Flow ◽  
Melting And Solidification

Abstract A study of the flattening and cooling of particles plasma-sprayed on a substrate is presented. The characteristic parameters of the splats are linked to the parameters of the impacting particles by using an experimental device consisting of a phase Doppler particle analyzer and a high-speed pyrometer. However, during the long experiments required to get reliable correlations, it was observed that variations in plasma spray operating conditions may alter the particles behavior in the plasma jet. Therefore, a simple and easy-to-use system was developed to control in real time the spray jet. In this paper, the effect of carrier gas flow rate, arc current and powder mass flow rate is investigated. The results on zirconia and alumina powders show the capability of the technique to sense the particle spray position and width.

scholarly journals Surface Response Based Modeling of Liposome Characteristics in a Periodic Disturbance Mixer

Micromachines ◽  
2020 ◽  
Vol 11 (3) ◽  
pp. 235 ◽  
Author(s):  
Rubén R. López ◽  
Ixchel Ocampo ◽  
Luz-María Sánchez ◽  
Anas Alazzam ◽  
Karl-F. Bergeron ◽  
...  
Keyword(s):  
Zeta Potential ◽  
Flow Rate ◽  
Size Range ◽  
Physicochemical Characteristics ◽  
Flow Rate Ratio ◽  
Total Flow ◽  
Experimental Conditions ◽  
Periodic Disturbance ◽  
Liposome Size ◽  
The Relationship

Liposomes nanoparticles (LNPs) are vesicles that encapsulate drugs, genes, and imaging labels for advanced delivery applications. Control and tuning liposome physicochemical characteristics such as size, size distribution, and zeta potential are crucial for their functionality. Liposome production using micromixers has shown better control over liposome characteristics compared with classical approaches. In this work, we used our own designed and fabricated Periodic Disturbance Micromixer (PDM). We used Design of Experiments (DoE) and Response Surface Methodology (RSM) to statistically model the relationship between the Total Flow Rate (TFR) and Flow Rate Ratio (FRR) and the resulting liposomes physicochemical characteristics. TFR and FRR effectively control liposome size in the range from 52 nm to 200 nm. In contrast, no significant effect was observed for the TFR on the liposomes Polydispersity Index (PDI); conversely, FRR around 2.6 was found to be a threshold between highly monodisperse and low polydispersed populations. Moreover, it was shown that the zeta potential is independent of TFR and FRR. The developed model presented on the paper enables to pre-establish the experimental conditions under which LNPs would likely be produced within a specified size range. Hence, the model utility was demonstrated by showing that LNPs were produced under such conditions.

Evaluation of the optimal carrier gas flow rate for the carbon nanotubes growth

2013 ◽  
Vol 39 (3) ◽  
pp. 258-261 ◽  
Author(s):  
A. G. Kurenya ◽  
D. V. Gorodetskiy ◽  
V. E. Arkhipov ◽  
A. V. Okotrub
Keyword(s):  
Carbon Nanotubes ◽  
Flow Rate ◽  
Gas Flow ◽  
Gas Flow Rate ◽  
Carrier Gas ◽  
Carrier Gas Flow

Growth of InAs nanowires with the morphology and crystal structure controlled by carrier gas flow rate

2015 ◽  
Vol 430 ◽  
pp. 87-92 ◽  
Author(s):  
Ming Li ◽  
Jingyun Wang ◽  
Kan Li ◽  
Yingjie Xing ◽  
H.Q. Xu
Keyword(s):  
Crystal Structure ◽  
Flow Rate ◽  
Gas Flow ◽  
Gas Flow Rate ◽  
Carrier Gas ◽  
Inas Nanowires ◽  
Carrier Gas Flow
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