Effect of Mandrel Rotation on the Accuracy of Computed Temperature Profile during Near Net Shape Forming by Plasma Spraying

2010 ◽  
Vol 25 (12) ◽  
pp. 1365-1371 ◽  
Author(s):  
Riken R. Patel ◽  
George S. Dulikravich ◽  
Arvind Agarwal
Keyword(s):  
Temperature Profile ◽  
Plasma Spraying ◽  
Near Net Shape ◽  
Net Shape Forming

Plasma Spraying of Solid Oxide Fuel Cell Components

1997 ◽  
Author(s):  
G. Schiller ◽  
M. Müller ◽  
R. Ruckdäschel ◽  
R. Henne ◽  
M. Lang
Keyword(s):  
Plasma Spraying ◽  
Plasma Spray ◽  
Solid Oxide ◽  
Rf Plasma ◽  
Spray Parameters ◽  
Oxide Fuel ◽  
Bipolar Plates ◽  
Metallic Bipolar Plates ◽  
Protective Layers ◽  
Near Net Shape

Abstract The central components for solid oxide fuel cells (SOFC) are the electrodes-electrolyte multilayer arrangement (PEN) and the separating bipolar plates. The PEN (Positive electrode- Electrolyte-Negative electrode) assembly consists of a dense gastight yttria-stabilized zirconia (YSZ) electrolyte and porous electrodes for which usually Ni-YSZ cermet anode and Sr-doped LaMnO3 cathode layers are used. The various PEN units are connected in a cell stack by bipolar plates which are either metallic or ceramic ones. Furthermore, a protective layer on the metallic bipolar plates consisting of a chromium alloy is required to prevent chromium evaporation leading to a rapid and strong degradation of the SOFC performance. At the DLR Stuttgart both the DC and the RF vacuum plasma spraying technique have been further developed and adapted to meet the requirements for the manufacture of the different SOFC components. The DCVPS process using specially developed Laval-like nozzles is especially appropriate to the production of thin and dense coatings as required for the electrolyte and the protective layers. However, applying special spray parameters and nozzles it is also possible to deposit porous electrode layers. The production of the entire PEN arrangement in one consecutive DC-VPS process is the objective of the actual development. On the other hand, the RF plasma spray technique is suitable for the near net-shape production of bulk components such as the metallic bipolar plate. The development of the deposition processes for the production of SOFC components using DC and RF plasma spray methods and the results obtained concerning PEN fabrication, deposition of protective layers and the near net-shape production of metallic bipolar plates are presented in the paper.

Mechanical Design for Accuracy of Linkage Servo Press for Near-Net Shape Forming

2018 ◽  
Author(s):  
Jing Tao ◽  
Huanan Qian ◽  
Suiran Yu
Keyword(s):  
Mechanical Design ◽  
Structure Design ◽  
Tolerance Allocation ◽  
Component Level ◽  
Eccentric Load ◽  
Servo Press ◽  
Near Net Shape ◽  
Net Shape Forming ◽  
Heavy Loads

The accuracy of machine is important to achieving highly accurate shapes. This paper is focused on mechanical design of highly accurate mechanical linkage servo press applicable to (near-)net shape forming. The effects of geometric errors, deformations under heavy loads and ram tilting are analyzed. A top-down design for accuracy approach is proposed: First, accuracy model for identification of inaccuracy-causing factors and their interlinking relations is developed. Then, based on this model, top accuracy index are decomposed and translated into structure design specifications at component level. Both analytic and simulation methods are employed for design for accuracy in aspects of dimensional and geometric tolerance allocation, stiffness synthesis and anti-eccentric load capability. A case study of mechanical design for accuracy of a six-linkage mechanical servo press is also presented to demonstrate and test the proposed design approaches.

Forming near net shape free-standing components by plasma spraying

2002 ◽  
Vol 57 (4) ◽  
pp. 882-886 ◽  
Author(s):  
A Devasenapathi ◽  
H.W Ng ◽  
S.C.M Yu ◽  
A.B Indra
Keyword(s):  
Plasma Spraying ◽  
Free Standing ◽  
Near Net Shape

Analysis of a Thixo-Lateral Forged Spindle from LTT C45, LTT C38 and LTT 100Cr6 Steel Grades

2014 ◽  
Vol 217-218 ◽  
pp. 347-354 ◽  
Author(s):  
Jokin Lozares ◽  
Zigor Azpilgain ◽  
Iñaki Hurtado ◽  
Iñigo Loizaga
Keyword(s):  
Mechanical Properties ◽  
Current Trend ◽  
Research Work ◽  
Raw Material ◽  
Key Factor ◽  
Steel Grades ◽  
Near Net Shape ◽  
Net Shape Forming ◽  
Near Net Shaping ◽  
Net Shaping

Due to the current trend in prices of raw material and their sources, near net shaping of mechanical components will become a key factor for the companies to get the desired competitiveness. Semisolid metal (SSM) forming is one of those near net shape forming techniques revealing a high potential to reduce material as well as energy consumption compared to conventional process technologies. Thus, the aim of this research work is to demonstrate the above by manufacturing a steel commercial automotive spindle by thixo-lateral forming from three different steel grades. The starting material, the microstructure and mechanical properties are analysed along the article. Material savings of 20% have been reported together with a substantial decrease of the forming forces. In addition, great mechanical properties have been achieved which brings the process closer to the desired final industrial application.

Manufacture of Aerospace Components With Pressure Welding

2010 ◽  
Author(s):  
Ho-Sung Lee ◽  
Jong-Hoon Yoon ◽  
Young-Moo Yi
Keyword(s):  
Attitude Control ◽  
Pressure Welding ◽  
Work Pressure ◽  
Welding Technology ◽  
Liquid Phases ◽  
Metallurgical Bonding ◽  
Suitable Amount ◽  
Near Net Shape ◽  
Net Shape Forming ◽  
Microscopic Deformation

Pressure welding technology is a solid state bonding process and generally involves heating the metal surfaces and then applying a suitable amount of axial pressure. In this state the metal components being joined undergo only microscopic deformation and the joining region is homogeneous and complete metallurgical bonding is possible without secondary materials or liquid phases. In the present work, pressure welding of titanium alloys has been investigated to fabricate several aerospace components with various complex configure. The result shows that the pressure welding method has been successfully applied with blow forming for near net shape forming of aerospace components, including high pressure tank for attitude control of spacecraft, and other lightweight structural panels.

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