Effects of Surface Modifications on Wear Mechanisms in Fly Ash Conveying Pipelines

2014 ◽  
pp. 147-154
Author(s):  
A. A. Cenna ◽  
K. C. Williams ◽  
M. G. Jones ◽  
W. Robinson
Keyword(s):  
Fly Ash ◽  
Wear Mechanisms ◽  
Surface Modifications

Wear mechanisms and in-service surface modifications of a Stellite 6B Co–Cr alloy

Wear ◽  
2012 ◽  
Vol 290-291 ◽  
pp. 10-17 ◽  
Author(s):  
M. Sebastiani ◽  
V. Mangione ◽  
D. De Felicis ◽  
E. Bemporad ◽  
F. Carassiti
Keyword(s):  
Wear Mechanisms ◽  
Surface Modifications

scholarly journals TAILORING SURFACE MORPHOLOGY AND TOPOGRAPHY OF SHOT-PEENED Ti6Al4V VIA GRIT BLASTING

2021 ◽  
Vol 55 (5) ◽  
Author(s):  
Yasemin Yıldıran Avcu ◽  
Okan Yetik ◽  
Mert Guney ◽  
Tamer Sınmazçelik ◽  
Egemen Avcu
Keyword(s):  
Surface Roughness ◽  
Quantitative Analysis ◽  
Surface Morphology ◽  
Surface Properties ◽  
Shot Peening ◽  
Wear Mechanisms ◽  
Surface Modifications ◽  
Grit Blasting ◽  
Embedded Particles ◽  
Modified Surface

The present study aims to reveal the effectiveness of grit blasting when modifying the surface properties of a Ti6Al4V alloy deteriorated due to shot peening. Ti6Al4V samples shot-peened under different parameters were grit-blasted (at impingement angles of 30° and 90°, blasting pressures of 1.5 bar and 3 bar). Grit blasting proved to be an effective way of tailoring the surface topography as the surface roughness of shot-peened samples (approx. 10 µm) declined to approx. 2 µm. The surface modifications mainly occurred via micro-ploughing and micro-cutting wear mechanisms, indicating that grit blasting at 30° was more favourable than at 90° for modifying the deteriorated surface properties after shot peening. Shot-peened samples behaved similarly to mirror-polished unpeened samples during grit blasting, showing that the modified surface and subsurface properties obtained via shot peening have an insignificant effect on grit blasting of the alloy. A quantitative analysis of the area covering the embedded particles on the surface of the alloy due to grit blasting showed that the area almost doubled when the alloy was grit blasted at 90° compared to 30°, highlighting an excessive amount of embedding, which would be critical when surface decontamination is important.

Bronchial stereocilia in the immotile cilia syndrome: A case report

1984 ◽  
Vol 42 ◽  
pp. 52-53
Author(s):  
George Price ◽  
Lizardo Cerezo
Keyword(s):  
Surface Modifications ◽  
Respiratory Epithelium ◽  
Immotile Cilia ◽  
Kartagener's Syndrome ◽  
Membrane Blebs ◽  
Radial Spokes ◽  
Males And Females ◽  
Dynein Arms ◽  
Ultrastructural Finding ◽  
Ultrastructural Findings

Ultrastructural defects of ciliary structure have been known to cause recurrent sino-respiratory infection concurrent with Kartagener's syndrome. (1,2,3) These defects are also known to cause infertility in both males and females. (4) Overall, the defects are defined as the Immotile, or Dyskinetic Cilia Syndrome (DCS). Several ultrastructural findings have been described, including decreased number of cilia, multidirection orientation, fused and compound cilia, membrane blebs, excess matrix in the axoneme, missing outer tubular doublets, translocated doublets, defective radial spokes and dynein arms. A rare but noteworthy ultrastructural finding in DCS is the predominance of microvilli-like structures on the luminal surface of the respiratory epithelium. (5,6) These permanent surface modifications of the apical respiratory epithelium no longer resemble cilia but reflect the ultrastructure of stereocilia, similar to that found in the epidydimal epithelium. Like microvilli, stereocilia are devoid of microtubular ultrastructure in comparison with true cilia.

Characterization of lead-bearing phases in municipal waste combustor fly ash

1996 ◽  
Vol 54 ◽  
pp. 516-517
Author(s):  
L. L. Sutter ◽  
G. R. Dewey ◽  
J. F. Sandell
Keyword(s):  
Fly Ash ◽  
Bottom Ash ◽  
Municipal Waste ◽  
Primary Concern ◽  
Leaching Behavior ◽  
Waste Combustion ◽  
Lead And Cadmium ◽  
Lead Speciation ◽  
Accepted Practice

Municipal waste combustion typically involves both energy recovery as well as volume reduction of municipal solid waste prior to landfilling. However, due to environmental concerns, municipal waste combustion (MWC) has not been a widely accepted practice. A primary concern is the leaching behavior of MWC ash when it is stored in a landfill. The ash consists of a finely divided fly ash fraction (10% by volume) and a coarser bottom ash (90% by volume). Typically, MWC fly ash fails tests used to evaluate leaching behavior due to high amounts of soluble lead and cadmium species. The focus of this study was to identify specific lead bearing phases in MWC fly ash. Detailed information regarding lead speciation is necessary to completely understand the leaching behavior of MWC ash.

INFLAMMATION, CHEMOKINE EXPRESSION, AND DEATH IN MONOCROTALINE-TREATED RATS FOLLOWING FUEL OIL FLY ASH INHALATION

1997 ◽  
Vol 9 (6) ◽  
pp. 541-565 ◽  
Author(s):  
Cheryl R. Killingsworth ◽  
Francesca Alessandrini ◽  
G. G. Krishna Murthy ◽  
Paul J. Catalano ◽  
Joseph D. Paulauskis ◽  
...  
Keyword(s):  
Fly Ash ◽  
Fuel Oil ◽  
Chemokine Expression ◽  
Oil Fly Ash

Antithrombogenic surface modifications in xenogenic pericardial vascular grafts: Initial in-vivo evaluation

2011 ◽  
Vol 59 (S 01) ◽  
Author(s):  
J Linneweber ◽  
F Voss ◽  
P Dohmen ◽  
W Erdbrügger ◽  
W Konertz
Keyword(s):  
Vascular Grafts ◽  
Surface Modifications ◽  
In Vivo Evaluation

Effect of Curing Time on the Performance of Fly Ash Geopolymer-Stabilized RAP Bases

2021 ◽  
Vol 33 (3) ◽  
pp. 04021001
Author(s):  
Maheshbabu Jallu ◽  
Sireesh Saride ◽  
Arul Arulrajah ◽  
Subrahmanyam Challapalli ◽  
Robert Evans
Keyword(s):  
Fly Ash ◽  
Curing Time

Review on Experimental Study on Effect of Corrosion In Reinforced Concrete Fly-Ash Beam

2020 ◽  
pp. 92-96
Author(s):  
Shubham N. Dadgal ◽  
Shrikant Solanke
Keyword(s):  
Fly Ash ◽  
Bond Strength ◽  
Structural Damage ◽  
Pullout Test ◽  
Partial Replacement ◽  
Structural Members ◽  
Accelerated Corrosion ◽  
Resistivity Method ◽  
Electrical Resistivity Method ◽  
Structural Failures

In modern days for structures in coastal areas it has been observed that the premature structural failures are occurs due to corrosion of the reinforcements of the designed structural member. The corrosion causes the structural damage which in turn leads to reduction in the bearing capacity of the concerned structural members. The aim of this study was to study the effect of partial replacement of fly ash to minimize the corrosion effect. Beams were designed and corroded by using artificial method known accelerated corrosion method. The beams were then tested for flexural and bond strength. Also the weight loss of the reinforced bars was been determined using electrical resistivity method. The fly ash will replace by 10% and 15%.The strength will calculate at varying percentage of corrosion at 10% and 15%. Beams will cast at M25 grade concrete. The flexural strength will test by using UTM and the bond strength will calculate using pullout test.

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