Oxidation Thermo-Mechanical and Novel Lattice-Gas Particle Deposition Modeling Aspects in Plasma Spraying of Ti-6Al-4V/SiC Fiber Composites

1998 ◽  
Author(s):  
E. Cochelin ◽  
F. Borit ◽  
G. Frot ◽  
M. Jeandin ◽  
L. Decker ◽  
...  
Keyword(s):  
Plasma Spraying ◽  
Particle Deposition ◽  
Lattice Gas ◽  
Thermal Stresses ◽  
Fiber Composites ◽  
Fiber Array ◽  
Sic Fiber ◽  
Diffusion Phenomena ◽  
Deposition Modeling ◽  
High Level

Abstract Plasma spraying is known to be one of the main promising processes for the manufacturing of Ti/SiC long fiber composites. However, some improvements remain to be done for this process to be applied in a routine industrial route. These include : oxygen contamination of the sprayed material through that of Ti particles before and during spraying ; damaging of fibers due to a high level of thermal stresses induced at the spraying stage; adequate deposition of Ti-based powder to achieve a low-porosity matrix and good impregnation of the fiber array. This contribution deals with work in the 3 previously mentioned fields, which resulted in a whole 3-fold study of the process. Oxidation was studied using electron microprobe analysis of elementary particles quenched and trapped into a closed box at various given flight distances. Oxygen diffusion phenomena within the particles are discussed from a preliminary theoretical approach coupled with experimental data. Isothermal and thermo-mechanical calculations were made using ABAQUS® code to determine stresses arising from contact of a liquid Ti-6A1-4V particle onto a SiC fiber. On a higher scale, i.e. that of the sprayed powder flow, a 2-dimensional original model simulating the deposition of droplets onto a substrate was developed. This model is based on a lattice-gas automaton which reproduces the hydrodynamical behavior of fluids.

Oxidation and Particle Deposition Modeling in Plasma Spraying of Ti-6Al-4V/SiC Fiber Composites

1999 ◽  
Vol 8 (1) ◽  
pp. 117-124 ◽  
Author(s):  
E. Cochelin ◽  
F. Borit ◽  
G. Frot ◽  
M. Jeandin ◽  
L. Decker ◽  
...  
Keyword(s):  
Plasma Spraying ◽  
Particle Deposition ◽  
Fiber Composites ◽  
Sic Fiber ◽  
Deposition Modeling

Deformation at interfaces of Ti-6Al-4V/SiC fiber composites

1992 ◽  
Vol 50 (1) ◽  
pp. 158-159
Author(s):  
Warren J. Moberly ◽  
Daniel B. Miracle ◽  
S. Krishnamurthy
Keyword(s):  
Thermal Stresses ◽  
Load Transfer ◽  
Coefficient Of Thermal Expansion ◽  
Hot Isostatic Pressing ◽  
Matrix Composites ◽  
Ongoing Research ◽  
Aerospace Applications ◽  
Sic Fiber ◽  
The Matrix ◽  
Intermetallic Matrix Composites

Titanium-aluminum alloy metal matrix composites (MMC) and Ti-Al intermetallic matrix composites (IMC), reinforced with continuous SCS6 SiC fibers are leading candidates for high temperature aerospace applications such as the National Aerospace Plane (NASP). The nature of deformation at fiber / matrix interfaces is characterized in this ongoing research. One major concern is the mismatch in coefficient of thermal expansion (CTE) between the Ti-based matrix and the SiC fiber. This can lead to thermal stresses upon cooling down from the temperature incurred during hot isostatic pressing (HIP), which are sufficient to cause yielding in the matrix, and/or lead to fatigue from the thermal cycling that will be incurred during application, A second concern is the load transfer, from fiber to matrix, that is required if/when fiber fracture occurs. In both cases the stresses in the matrix are most severe at the interlace.

Oxidation-Assisted Pulsatile Three-Stream Non-Newtonian Slurry Atomization

2018 ◽  
Author(s):  
Wayne Strasser
Keyword(s):  
Optimum Design ◽  
Feed Rate ◽  
Thermal Stresses ◽  
Cfd Modeling ◽  
Cold Flow ◽  
Acoustic Signatures ◽  
High Level ◽  
Geometric Permutations ◽  
Relative Weighting ◽  
Very High

Past work involving validated “cold-flow” CFD modeling of self-generating and self-sustaining pulsating transonic non-Newtonian slurry atomization elucidated acoustic signatures, atomization mechanisms, and the effects of numerics and geometric permutations. The numerical method has now been incorporated with exothermic oxidation reaction kinetics relations along with radiation, i.e. no longer cold-flow. These models provide substantially increased model rigor and allow for new pulsing thermal measures which help assess injector thermal stresses. Twelve models have been run for extended periods of time in order to assess the effects of dramatic changes in gas feed rate and prefilming (retraction) length. Given the new metrics and models, multiple statistically optimized designs are potentially available depending on the objective function(s) and their relative weightings in the overall value proposition to the project. In the case in which all metrics have equal value to the project and are simultaneously considered in a statistical model, the optimum design involves a mid-level of retraction and a mid-level gas feed rate. If, however, more relative weighting is placed on the importance of droplet size minimization and injector thermal management in lieu of feed passage pressure drop minimization, the optimum design involves a similar retraction but a very high level of gas feed rate.

Microscale damage evolution and stress redistribution in Ti–SiC fiber composites

2003 ◽  
Vol 51 (14) ◽  
pp. 4239-4250 ◽  
Author(s):  
Jay C. Hanan ◽  
Ersan Üstündag ◽  
Irene J. Beyerlein ◽  
Geoffrey A. Swift ◽  
Jonathan D. Almer ◽  
...  
Keyword(s):  
Damage Evolution ◽  
Fiber Composites ◽  
Stress Redistribution ◽  
Sic Fiber

Simulation of Thermal Plasma Spraying of Partially Molten Ceramics: Effect of Carrier Gas on Particle Deposition and Phase Change Phenomena

2000 ◽  
Author(s):  
I. Ahmed ◽  
T. L. Bergman
Keyword(s):  
Plasma Spraying ◽  
Thermal Plasma ◽  
Particle Deposition ◽  
Carrier Gas ◽  
Thermal Plasma Spraying ◽  
History Of ◽  
Powder Particles ◽  
Phase Change Phenomena ◽  
Plasma Spraying Process ◽  
Nanostructured Ceramics

Abstract A 3D simulation of the thermal plasma spraying process is reported. In particular, the effect of the radial injection of a carrier gas is taken into account for a dilute spray. The thermal history of powder particles of different sizes is predicted. It is shown that introduction of a carrier gas can lead to a significant modification of the plasma jet, and can have an effect on the thermal histories of the injected particles. The study is motivated by the processing of non-traditional materials, specifically nanostructured ceramics.

Invsetigation about Residual Stresses of Plasma-Spraying Sm2Zr2O7/YSZ Thermal Barrier Coatings of Different Substrate Conditions

2011 ◽  
Vol 308-310 ◽  
pp. 1177-1181 ◽  
Author(s):  
Hong Song Zhang ◽  
Gang Yi Cai ◽  
Shu Sen Yang
Keyword(s):  
Residual Stress ◽  
Residual Stresses ◽  
Plasma Spraying ◽  
Thermal Stresses ◽  
Thermal Barrier ◽  
Shear Stresses ◽  
Substrate Thickness ◽  
Optimum Thickness ◽  
Slight Effect ◽  
Axial Residual Stress

Effect of substrate conditions, including material type, thickness and radius of substrate, on residual thermal stresses of plasma spraying Sm2Zr2O7/YSZ TBCs was analyzed through finite element method in this paper. The radial and shear stresses of the coating decrease with increasing of distance from the center to edge, and they decrease abruptly at the edge of the specimen, while the axial residal stress increase abruptly at the edge of substrate. All residual stresses increase with increasing of thermal expansion coefficient of substrate. The thickness of substrate has slight effect on the radial residual stress, axial residual stress and shear stress are almost uneffected by substrate thickness. The optimum thickness of substrate is 10mm. Radius of substrate have no effect on radial stress when it is greater than 28mm.

Application of lattice gas models to plasma spraying

1998 ◽  
Vol 14 (5) ◽  
pp. 400-404
Author(s):  
V. Guipont ◽  
E. Cochelin ◽  
F. Borit ◽  
L. Decker ◽  
D. Jeulin ◽  
...  
Keyword(s):  
Plasma Spraying ◽  
Lattice Gas ◽  
Lattice Gas Models
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