Microstructural Analysis of Electronically Conductive Ceramic Coatings Synthesized by Reactive ION Plating and Sputter Deposition

1986 ◽  
pp. 461-461
Author(s):  
L. D. Stephenson ◽  
V. F. Hock ◽  
J. M. Rigsbee ◽  
D. Teer ◽  
D. Arnell
Keyword(s):  
Microstructural Analysis ◽  
Ceramic Coatings ◽  
Sputter Deposition ◽  
Ion Plating

Design and Experiments of Graded Thermal Barrier Coatings by Plasma Sprayings

1998 ◽  
Author(s):  
H. Ahn ◽  
S.H. Hong
Keyword(s):  
Thermal Shock ◽  
Thermal Stresses ◽  
Microstructural Analysis ◽  
Ceramic Coatings ◽  
Optical Microscope ◽  
Fractional Factorial ◽  
Optimum Process ◽  
Process Conditions ◽  
Thermal Barrier ◽  
Material Evaluation

Abstract Graded metal-to-ceramic coatings as thermal barrier coating (TBC) have been studied to improve the surface properties of the coating on high-temperature components. The atmospheric and low pressure plasma spray experiments are carried out with partially stabilized zirconia (YSZ and MSZ) and MCrAlY for mixing of functionally gradient materials. Especially, three-layer and five-layer graded TBCs are designed and produced to match gradually the material properties of a substrate and a top coating for reducing thermal stresses. A fiilly-saturated fractional factorial test is employed to determine optimum process conditions related to the thermal plasma generation, powder feeding, and substrate handling. Microstructural analysis using optical microscope and SEM, compositional analysis by XRD, bond strength test and thermal shock tests are carried out for material evaluation of fabricated TBCs. According to the results of material evaluation, the spray process is optimized for improving coating quality, and the proper raw materials are selected as a result of microstructural analysis. Especially, it is found that the durability and strain tolerance to thermal shock are remarkably increased by the gradation of TBCs and the improvement of graded TBC results from the fracture mechanism related to the vertical crack.

Reactive Ion Plating of Ceramic Coatings for Wear Reduction in Metal Forming

1981 ◽  
Vol 59 (1) ◽  
pp. 123-126 ◽  
Author(s):  
A. Matthews ◽  
D. G. Teer ◽  
J. Halling
Keyword(s):  
Metal Forming ◽  
Ceramic Coatings ◽  
Ion Plating ◽  
Wear Reduction

scholarly journals Microstructural Analysis and Transport Properties of Thermally Sprayed Multiple-Layer Ceramic Coatings

2018 ◽  
Vol 27 (3) ◽  
pp. 371-378 ◽  
Author(s):  
Hsin Wang ◽  
Govindarajan Muralidharan ◽  
Donovan N. Leonard ◽  
J. Allen Haynes ◽  
Wallace D. Porter ◽  
...  
Keyword(s):  
Transport Properties ◽  
Microstructural Analysis ◽  
Ceramic Coatings ◽  
Multiple Layer ◽  
Thermally Sprayed

The Development of (Ti,Al)N and (Ti,Nb)N Ceramic Coatings Produced by Steered Arc Ion-Plating

1992 ◽  
Vol 102-104 ◽  
pp. 599-614 ◽  
Author(s):  
J.P. Celis ◽  
J.R. Roos ◽  
E. Vancoille ◽  
S. Boelens ◽  
J. Ebberink
Keyword(s):  
Ceramic Coatings ◽  
Arc Ion Plating ◽  
Ion Plating

scholarly journals Microstructural analysis of novel Gd2Ti2O7 thin films processed via sputter deposition

2021 ◽  
Vol 199 ◽  
pp. 109430
Author(s):  
Benjamin K. Derby ◽  
Terry G. Holesinger ◽  
James A. Valdez ◽  
Blas P. Uberuaga ◽  
Cortney R. Kreller
Keyword(s):  
Thin Films ◽  
Microstructural Analysis ◽  
Sputter Deposition

Electron microscopy studies of plasma-sprayed materials

1983 ◽  
Vol 41 ◽  
pp. 70-71
Author(s):  
K.R. Subramanian ◽  
A.H. King ◽  
H. Herman
Keyword(s):  
Plasma Spraying ◽  
Substrate Surface ◽  
Flame Temperature ◽  
Ceramic Coatings ◽  
Metallic Substrates ◽  
Hot Plasma ◽  
Almost All ◽  
Plasma Sprayed ◽  
Hostile Environments ◽  
Plasma Spraying Process

Plasma spraying is a technique which is used to apply coatings to metallic substrates for a variety of purposes, including hardfacing, corrosion resistance and thermal barrier applications. Almost all of the applications of this somewhat esoteric fabrication technique involve materials in hostile environments and the integrity of the coatings is of paramount importance: the effects of process variables on such properties as adhesive strength, cohesive strength and hardness of the substrate/coating system, however, are poorly understood.Briefly, the plasma spraying process involves forming a hot plasma jet with a maximum flame temperature of approximately 20,000K and a gas velocity of about 40m/s. Into this jet the coating material is injected, in powder form, so it is heated and projected at the substrate surface. Relatively thick metallic or ceramic coatings may be speedily built up using this technique.

Microstructural Analysis of SiO2-Al2O3 Glasses

1982 ◽  
Vol 40 ◽  
pp. 562-563
Author(s):  
C. M. Jantzen ◽  
D. G. Howitt
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Microstructural Analysis ◽  
Liquid Immiscibility ◽  
Metastable Region ◽  
Transmission Electron ◽  
Liquidus Temperatures

The mullite-SiO2 liquidus has been extensively studied, and it has been shown that the flattening of the liquidus is related to the existence of a metastable region of liquid immiscibility at sub-liquidus temperatures which is detectable by transmission electron microscopy (TEM) (Fig. 1).

STM studies of crystal growth

1991 ◽  
Vol 49 ◽  
pp. 374-375
Author(s):  
M. G. Lagally
Keyword(s):  
Crystal Growth ◽  
Molecular Beam ◽  
Chemical Vapor ◽  
Sputter Deposition ◽  
Field Of View ◽  
Scanning Tunneling ◽  
Wide Field ◽  
Tunneling Microscopy ◽  
Wide Field Of View ◽  
The One

It has been recognized since the earliest days of crystal growth that kinetic processes of all Kinds control the nature of the growth. As the technology of crystal growth has become ever more refined, with the advent of such atomistic processes as molecular beam epitaxy, chemical vapor deposition, sputter deposition, and plasma enhanced techniques for the creation of “crystals” as little as one or a few atomic layers thick, multilayer structures, and novel materials combinations, the need to understand the mechanisms controlling the growth process is becoming more critical. Unfortunately, available techniques have not lent themselves well to obtaining a truly microscopic picture of such processes. Because of its atomic resolution on the one hand, and the achievable wide field of view on the other (of the order of micrometers) scanning tunneling microscopy (STM) gives us this opportunity. In this talk, we briefly review the types of growth kinetics measurements that can be made using STM. The use of STM for studies of kinetics is one of the more recent applications of what is itself still a very young field.

Observation by HVEM of the martensite transformation and the superconducting transition in Nb3Sn

1988 ◽  
Vol 46 ◽  
pp. 788-789
Author(s):  
M. A. Kirk ◽  
M. C. Baker ◽  
B. J. Kestel ◽  
H. W. Weber
Keyword(s):  
Thin Films ◽  
Low Temperature ◽  
Superconducting State ◽  
Martensite Transformation ◽  
Sputter Deposition ◽  
Diffusion Reaction ◽  
Solute Diffusion ◽  
Superconducting Transition ◽  
Twin Boundaries ◽  
Martensite Structure

It is well known that a number of compound superconductors with the A15 structure undergo a martensite transformation when cooled to the superconducting state. Nb3Sn is one of those compounds that transforms, at least partially, from a cubic to tetragonal structure near 43 K. To our knowledge this transformation in Nb3Sn has not been studied by TEM. In fact, the only low temperature TEM study of an A15 material, V3Si, was performed by Goringe and Valdre over 20 years ago. They found the martensite structure in some foil areas at temperatures between 11 and 29 K, accompanied by faults that consisted of coherent twin boundaries on {110} planes. In pursuing our studies of irradiation defects in superconductors, we are the first to observe by TEM a similar martensite structure in Nb3Sn.Samples of Nb3Sn suitable for TEM studies have been produced by both a liquid solute diffusion reaction and by sputter deposition of thin films.

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