Journal ArticleDOI
Understanding plasma spraying
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TLDR
In this paper, a summary of the actual knowledge in plasma spraying with an emphasis on the points where work is still in progress is presented, including: the plasma torches with the resulting plasma jets and their interactions with the surrounding environment, powder injection with the heat, momentum and mass transfers between particles and first plasma jets, the particles flattening and solidification, forming splats which then layer to form the coating.Abstract:
This article intends to summarize our actual knowledge in plasma spraying with an emphasis on the points where work is still in progress. It presents successively: the plasma torches with the resulting plasma jets and their interactions with the surrounding environment; the powder injection with the heat, momentum and mass transfers between particles and first plasma jets and then plasma plume; the particles flattening and solidification, forming splats which then layer to form the coating; the latest developments related to the production of plasma sprayed finely structured coatings.read more
Citations
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Journal ArticleDOI
Numerical analysis of the plasma-induced self-shadowing effect of impinging particles and phase transformation in a novel long laminar plasma jet
TL;DR: In this paper, a quasi-columnar YSZ coating by using an atmospheric plasma spray - physical vapor deposition (APS-PVD) method is investigated. And the mechanism of the self-shadowing effect from impinging particles that leads to the formation of a quasicolumnar feature at the boundary layer of the substrate is demonstrated by the three-dimensional numerical simulation and the experimental observation.
Journal ArticleDOI
A Study on Arc Instability Phenomena of an Axial Injection Cathode Plasma Torch
TL;DR: In this paper, the arc instability in axially injecting single cathode plasma torch design was investigated and the influence of plume elongation and accelerated gas velocities on the arc behavior in different configurations under low pressure environment.
Journal ArticleDOI
Bioactive surface modifications through thermally sprayed hydroxyapatite composite coatings: a review of selective reinforcements.
TL;DR: In this paper , a review of the suitability of thermal spray techniques based on the microstructure, mechanical, and biological properties is presented, which can intrigue future researchers to understand the scope of surface coatings in achieving the better performance of implants at clinical trials.
Radio Frequency Plasma Synthesis of Boron Nitride Nanotubes (BNNTs) for Structural Applications: Part I
TL;DR: In this paper, the authors present a survey of the state of the art with regard to nano-material production by analyzing the pros and cons of existing methods, and combine the best concepts and apply the NASA Langley Research Center (LaRC) RFPS facility to reliably synthesize large quantities of consistent, high-purity BNNTs.
Journal ArticleDOI
Modeling the Build-Up of Internal Stresses in Multilayer Thick Thermal Barrier Coatings
H. Samadi,Thomas W. Coyle +1 more
TL;DR: In this paper, a numerical model for calculating the evolution of stresses within a multilayer coating during deposition is introduced, which is validated by comparison with temperature and curvature measurements made during coating deposition.
References
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Book
The Science and Engineering of Thermal Spray Coatings
TL;DR: In this article, the authors present a detailed overview of the main steps in the process of spraying particles and their properties, including properties such as temperature, surface properties, and surface properties.
Journal ArticleDOI
Residual Stresses in Thermal Spray Coatings and Their Effect on Interfacial Adhesion : A Review of Recent Work
T.W. Clyne,S. C. Gill +1 more
TL;DR: In this paper, the main experimental techniques for measurement of residual stresse are briefly described, with particular attention given to the method of continuous curvature monitoring, and relationships are presented between residual stresses and corresponding strain energy release rates during interfacial debonding.
Journal ArticleDOI
Knowledge concerning splat formation : An invited review
TL;DR: In this article, the impact and flattening of single particles on smooth or rough substrates with different tilting is summarized and different diagnostic methods, including imaging, are briefly described.
Journal ArticleDOI
Recent advances of superhard nanocomposite coatings: a review
TL;DR: A review of the present status of the research and technological development in the field of superhard nanocomposite coatings is attempted in this article, where a number of deposition techniques have been used to prepare Nanocomposites. Among them, reactive magnetron sputtering is most commonly used.
Journal ArticleDOI
On a three-dimensional volume tracking model of droplet impact
TL;DR: In this article, a three-dimensional model of droplet impact onto asymmetric surface geometries is developed, based on RIPPLE, and combines a fixed-grid control volume discretization of the flow equations with a volume tracking algorithm to track the droplet free surface.