Thermal and thermomechanical characteristics of monolithic refractory composite matrix containing surface-modified graphite

Plasma pretreatment on the top and bond coats was performed and its influence on the thermal durability of thermal barrier coating (TBC) system was investigated through cyclic thermal exposure. Two types of bond coat were prepared by different methods, namely, air plasma spray (APS) and high-velocity oxy-fuel (HVOF), and two kinds of feedstock powder were employed for preparing the top coat in APS process. The better thermal durability was achieved in the vertically cracked TBC with the surface modified bond coat or with the bond coat prepared by APS process. The hardness and fracture toughness values of TBCs increased because of densification of the top coat during cyclic thermal exposure, and the bond coat prepared by HVOF process showed higher values than that by APS process. The TBCs with the surface modified bond coat were more efficient in improving adhesive strength than those without plasma pretreatment on the bond coat. The relationship between microstructure evolution and thermomechanical characteristics of TBCs with plasma pretreatment was discussed in cyclic thermal exposure.

Download Full-text

Thermomechanical Characteristics of Low Carbon Magnesia-Based Monolithic Refractory Containing Nanostructured Surface-Modified Graphites in Matrix

Transactions of the Indian Ceramic Society ◽

10.1080/0371750x.2017.1281765 ◽

2017 ◽

Vol 76 (2) ◽

pp. 118-127 ◽

Cited By ~ 3

Author(s):

S. Mukhopadhyay ◽

A. Saha ◽

S. Chatterjee ◽

S. Ghosh

Keyword(s):

Low Carbon ◽

Nanostructured Surface ◽

Thermomechanical Characteristics ◽

Surface Modified

Download Full-text

Improvement of thermal conductivity of carbonaceous matrix in monolithic Al2O3–C refractory composite by surface-modified graphites

Ceramics International ◽

10.1016/j.ceramint.2020.08.090 ◽

2020 ◽

Vol 46 (18) ◽

pp. 29173-29181

Author(s):

P. Das ◽

S. Sinhamahapatra ◽

K. Dana ◽

S. Mukhopadhyay

Keyword(s):

Thermal Conductivity ◽

Surface Modified ◽

Refractory Composite

Download Full-text

Analytical Electron Microscopy of Surface-Modified Ceramics

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100118291 ◽

1985 ◽

Vol 43 ◽

pp. 276-279

Author(s):

P. S. Sklad

Keyword(s):

Electron Microscopy ◽

Analytical Electron Microscopy ◽

Theoretical Models ◽

Ceramic Materials ◽

Solute Concentration ◽

Second Phase ◽

Analytical Electron ◽

Implantation Techniques ◽

Lattice Damage ◽

Surface Modified

Over the past several years, it has become increasingly evident that materials for proposed advanced energy systems will be required to operate at high temperatures and in aggressive environments. These constraints make structural ceramics attractive materials for these systems. However it is well known that the condition of the specimen surface of ceramic materials is often critical in controlling properties such as fracture toughness, oxidation resistance, and wear resistance. Ion implantation techniques offer the potential of overcoming some of the surface related limitations.While the effects of implantation on surface sensitive properties may be measured indpendently, it is important to understand the microstructural evolution leading to these changes. Analytical electron microscopy provides a useful tool for characterizing the microstructures produced in terms of solute concentration profiles, second phase formation, lattice damage, crystallinity of the implanted layer, and annealing behavior. Such analyses allow correlations to be made with theoretical models, property measurements, and results of complimentary techniques.

Download Full-text

SPECTRAL CHARACTERIZATION OF REDOX-ACTIVE PRUSSIAN BLUE ON METALLATED PLASMA POLYMER SURFACE MODIFIED CARBON ELECTRODES USING PHOTOTHERMAL DETECTION

Le Journal de Physique Colloques ◽

10.1051/jphyscol:1983645 ◽

1983 ◽

Vol 44 (C6) ◽

pp. C6-285-C6-290 ◽

Cited By ~ 3

Author(s):

J. W. Childers ◽

A. L. Crumbliss ◽

P. S. Lugg ◽

R. A. Palmer ◽

N. Morosoff ◽

...

Keyword(s):

Prussian Blue ◽

Polymer Surface ◽

Spectral Characterization ◽

Plasma Polymer ◽

Carbon Electrodes ◽

Redox Active ◽

Surface Modified

Download Full-text

Surface modified PTFE promotes endothelial cell adhesion and simultaneously inhibits the attachment of platelets and bacteria

The Thoracic and Cardiovascular Surgeon ◽

10.1055/s-0034-1367130 ◽

2014 ◽

Vol 62 (S 01) ◽

Cited By ~ 1

Author(s):

M. Gabriel ◽

H. Weiler ◽

U. Mehlhorn ◽

C.-F. Vahl

Keyword(s):

Cell Adhesion ◽

Endothelial Cell ◽

Surface Modified ◽

Endothelial Cell Adhesion

Download Full-text

Experimental and Theoretical Comparable Study of Pure and Zinc Porphyrin Surface Modified ZnO Nanorod Arrays for Hybrid Solar Cell Applications

10.32792/utq/utjsci/vol7/2/26 ◽

2020 ◽

pp. 114-119

Keyword(s):

Solar Cell ◽

Electrochemical Impedance ◽

Hybrid Solar Cell ◽

Cell Performance ◽

Solar Cell Performance ◽

Solar Cell Efficiency ◽

Cell Efficiency ◽

Annealing Effects ◽

Vertically Aligned ◽

Surface Modified

Experimental and theoretical study Porphyrin-grafted ZnO nanowire arrays were investigated for organic/inorganic hybrid solar cell applications. Two types of porphyrin – Tetra (4-carboxyphenyle) TCPP and meso-Tetraphenylporphine (Zinc-TPP)were used to modify the nanowire surfaces. The vertically aligned nanowires with porphyrin modifications were embedded in graphene-enriched poly (3-hexylthiophene) [G-P3HT] for p-n junction nanowire solar cells. Surface grafting of ZnO nanowires was found to improve the solar cell efficiency. There are different effect for the two types of porphyrin as results of Zn existing. Annealing effects on the solar cell performance were investigated by heating the devices up to 225 °C in air. It was found that the cell performance was significantly degraded after annealing. The degradation was attributed to the polymer structural change at high temperature as evidenced by electrochemical impedance spectroscopy measurements.

Download Full-text