The MSCP Process for Semi-Solid Slurry Production

2006 ◽  
Vol 116-117 ◽  
pp. 362-365 ◽  
Author(s):  
Zhan Feng Tian ◽  
Zhi Feng Zhang ◽  
Jun Xu ◽  
Li Kai Shi
Keyword(s):  
Continuous Production ◽  
Electromagnetic Stirring ◽  
Preparation Process ◽  
High Quality ◽  
Magnetic Stirring ◽  
Continuous Preparation ◽  
The Common ◽  
Feedstock Production ◽  
Electro Magnetic ◽  
Semi Solid

Production of semi-solid slurry with fine and uniform microstructures is one of the basic and key problems for the industrial application of semi-solid processing. The common disadvantages of existing techniques are as follows: continuous production difficulty, high process controlling requirement and low quality microstructure. In order to overcome those problems, the MSCP (Multielectromagnetic Stirring Continuous Preparation) process has been developed by GRINM. Experimental results show that annular chamber for feedstock production can improve the efficiency of electromagnetic stirring and reduce the difficulty of temperature grad control. Compared with single electromagnetic stirring, multi- electro magnetic stirring can achieve more uniform stirring. Strict temperature grad control in annular chamber is the key of continuous preparation of high quality semi-solid slurry. Semi-solid slurry of different solid fractions was obtained by MSCP.

Effect of Electromagnetic Stirring on Morphology Evolution of Mg2Si in Hypereutectic Al-Si Alloy Composite

2012 ◽  
Vol 217-219 ◽  
pp. 47-50
Author(s):  
Zheng Liu ◽  
Hong Biao Xu ◽  
Zhi Peng Zhou ◽  
He Jun Xu
Keyword(s):  
Mechanical Properties ◽  
Isothermal Holding ◽  
Electromagnetic Stirring ◽  
Mg2si Particle ◽  
Morphology Evolution ◽  
Alloy Composite ◽  
Magnetic Stirring ◽  
Size And Morphology ◽  
Electro Magnetic

Mg2Si reinforced hypereutectic Al-Si composite was prepared and the effects of electro- magnetic stirring on Mg2Si particle in the composite were researched. The results indicated that there were the important effects of electromagnetic stirring on size and morphology of the particle in the composite. The morphology and size of the particle in the composite were obviously improved by electromagnetic stirring. In comparison with the sample without isothermal holding, the size of the particle isothermally held slightly increased under the same stirring condition, but the roundness of the particle was improved. After isothermal holding, the mechanical properties of the composite prepared by electromagnetic stirring were improved to some extent.

Development of Microstructure of Semi-Solid A356 Alloy by Alternating Electromagnetic Stirring

2011 ◽  
Vol 266 ◽  
pp. 84-88
Author(s):  
Wen Liu ◽  
Ji Qiang Li ◽  
Xu Ding
Keyword(s):  
Particle Diameter ◽  
A356 Alloy ◽  
Good Method ◽  
Processing Parameters ◽  
Electromagnetic Stirring ◽  
Isothermal Treatment ◽  
Average Particle ◽  
Shape Coefficient ◽  
Magnetic Stirring ◽  
Semi Solid

The influence of processing parameters on the semi-solid microstructure has been investigated in the course of semi-solid slurry preparation of A356 aluminum alloy by alternating electromagnetic stirring. The results show that compared with horizontal, vertical and spiral magnetic stirring method, alternating magnetic stirring could make eligible slurry with finer, more equiaxed and more homogeneous primary α particles in much shorter time. The microstructure evolution during isothermal treatment is studied and it is shown that the average particle diameter increases with the holding time and the shape coefficient decreases somewhat at first, and then decreases sharply in the end. It is discovered that alternating electromagnetic stirring is a good method to prepare semi-solid slurry with fine and relatively round primary particles.

Development of Microstructure of Semi-Solid 6061 Alloy with Method of Alternating Electromagnetic Stirring

2011 ◽  
Vol 199-200 ◽  
pp. 1870-1873
Author(s):  
Wen Liu ◽  
Jun Long Chen ◽  
Xiao Li Ma ◽  
Xu Ding
Keyword(s):  
Isothermal Holding ◽  
Particle Diameter ◽  
Electromagnetic Stirring ◽  
Isothermal Treatment ◽  
Average Particle ◽  
Average Particle Diameter ◽  
Shape Coefficient ◽  
Magnetic Stirring ◽  
Semi Solid ◽  
Α Particles

The semi-solid 6061 alloy was obtained with method of alternating electromagnetic stirring. The results show that compared with horizontal, vertical and spiral magnetic stirring method, alternating magnetic stirring could make eligible slurry with finer, more equiaxed and more homogeneous primary α particles in much shorter time. The microstructure evolution during isothermal treatment is studied and it is shown that the average particle diameter increases with the increase of isothermal holding time and the shape coefficient decreases somewhat at first, and then decreases sharply in the end.

Development of Rheo-Diecasting of Al-Si Alloys Based on a Modified DSCP Process

2008 ◽  
Vol 141-143 ◽  
pp. 185-190 ◽  
Author(s):  
Zhi Feng Zhang ◽  
Jun Xu ◽  
Yue Long Bai ◽  
Li Kai Shi
Keyword(s):  
Al Alloys ◽  
Electromagnetic Stirring ◽  
Semisolid Slurry ◽  
High Shear ◽  
High Quality ◽  
Uniform Microstructure ◽  
Continuous Preparation ◽  
Near Net Shape ◽  
High Integrity

An advanced rheo-diecasting technique, based on a modified multi-electromagnetic stirring continuous preparation (MSCP) process was developed for manufacturing near-net shape Al-alloys components with high integrity. The modified MSCP process innovatively combines noncontact electromagnetic stirring and an annular chamber with specially designed profiles to in situ make high quality semisolid slurry, and intensive forced shearing and self-wiping action can be achieved under high shear rate and high intensity of turbulence inside the annular chamber. Three Al-Si alloys with hypoeutectic, eutectic and hypereutectic compositions were tested in this study. The results indicate that, compared with those produced by conventional high-pressure diecasting (HPDC) process, rheo-diecasting samples based on the modified MSCP process have finer and more uniform microstructure.

scholarly journals Homogenous overexpression of the extracellular matrix protein Netrin-1 in a hollow fiber bioreactor

2021 ◽  
Author(s):  
Aniel Moya-Torres ◽  
Monika Gupta ◽  
Fabian Heide ◽  
Natalie Krahn ◽  
Scott Legare ◽  
...  
Keyword(s):  
Extracellular Matrix ◽  
Hollow Fiber ◽  
Mammalian Cells ◽  
Matrix Protein ◽  
Continuous Production ◽  
Extracellular Matrix Protein ◽  
Close Monitoring ◽  
High Quality ◽  
Biolayer Interferometry ◽  
Hollow Fiber Bioreactor

Abstract The production of recombinant proteins for functional and biophysical studies, especially in the field of structural determination, still represents a challenge as high quality and quantities are needed to adequately perform experiments. This is in part solved by optimizing protein constructs and expression conditions to maximize the yields in regular flask expression systems. Still, work flow and effort can be substantial with no guarantee to obtain improvements. This study presents a combination of workflows that can be used to dramatically increase protein production and improve processing results, specifically for the extracellular matrix protein Netrin-1. This proteoglycan is an axon guidance cue which interacts with various receptors to initiate downstream signaling cascades affecting cell differentiation, proliferation, metabolism, and survival. We were able to produce large glycoprotein quantities in mammalian cells, which were engineered for protein overexpression and secretion into the media using the controlled environment provided by a hollow fiber bioreactor. Close monitoring of the internal bioreactor conditions allowed for stable production over an extended period of time. In addition to this, Netrin-1 concentrations were monitored in expression media through biolayer interferometry which allowed us to increase Netrin-1 media concentrations tenfold over our current flask systems while preserving excellent protein quality and in solution behavior. Our particular combination of genetic engineering, cell culture system, protein purification, and biophysical characterization permitted us to establish an efficient and continuous production of high-quality protein suitable for structural biology studies that can be translated to various biological systems. Key points • Hollow fiber bioreactor produces substantial yields of homogenous Netrin-1 • Biolayer interferometry allows target protein quantitation in expression media • High production yields in the bioreactor do not impair Netrin-1 proteoglycan quality Graphical abstract

scholarly journals A High Rigidity and Precision Scanning Tunneling Microscope with Decoupled XY and Z Scans

Scanning ◽  
2017 ◽  
Vol 2017 ◽  
pp. 1-7
Author(s):  
Xu Chen ◽  
Tengfei Guo ◽  
Yubin Hou ◽  
Jing Zhang ◽  
Wenjie Meng ◽  
...  
Keyword(s):  
Scanning Tunneling Microscope ◽  
Atomic Resolution ◽  
Scanning Tunneling ◽  
Electronic Noise ◽  
High Quality ◽  
Tunneling Microscope ◽  
The Core ◽  
High Rigidity ◽  
The Common ◽  
The Impact

A new scan-head structure for the scanning tunneling microscope (STM) is proposed, featuring high scan precision and rigidity. The core structure consists of a piezoelectric tube scanner of quadrant type (for XY scans) coaxially housed in a piezoelectric tube with single inner and outer electrodes (for Z scan). They are fixed at one end (called common end). A hollow tantalum shaft is coaxially housed in the XY-scan tube and they are mutually fixed at both ends. When the XY scanner scans, its free end will bring the shaft to scan and the tip which is coaxially inserted in the shaft at the common end will scan a smaller area if the tip protrudes short enough from the common end. The decoupled XY and Z scans are desired for less image distortion and the mechanically reduced scan range has the superiority of reducing the impact of the background electronic noise on the scanner and enhancing the tip positioning precision. High quality atomic resolution images are also shown.

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