scholarly journals Effect of Gas Pressure and Temperature on Stereometric Properties of Al+Al2O3 Composite Coatings Deposited by LPCS Method

2014 ◽  
Vol 59 (3) ◽  
pp. 879-886 ◽  
Author(s):  
M. Winnicki ◽  
T. Piwowarczyk ◽  
A. Małachowska ◽  
A. Ambroziak
Keyword(s):  
Laval Nozzle ◽  
Composite Coatings ◽  
Gas Pressure ◽  
Feedstock Powder ◽  
Substrate Distance ◽  
Al2o3 Composite ◽  
Spray Method ◽  
Powder Mass ◽  
De Laval Nozzle ◽  
Temperature And Pressure

Abstract The paper deals with effect of working gas pressure and temperature on surface stereometry of coatings deposited by low-pressure cold spray method. Examinations were focused on aluminium coatings which are commonly used to protect substrate against corrosion. A commercial Al spherical feedstock powder with admixture of Al2O3 (Al + 60vol.-% Al2O3), granulation -50+10 µm, was used to coat steel, grade S235JR. Thedeposited coatings were studied to determine their stereometry, i.e. roughness, transverse and longitudinal waviness, topography of surface and thickness as the functions of gas pressure and temperature. A profilometer and focal microscope were used to evaluate the stereometric properties. In order to reduce the number of variables, the remaining process parameters, i.e. shape and size of de Laval nozzle, nozzle-to-substrate distance, powder mass flow rate, linear velocity of spraying gun, were kept unchanged. The investigation confirmed influence of temperature and pressure on coating thickness as well as on the surface seterometry.

Characterisation of Cold Spray Titanium Coatings

2010 ◽  
Vol 654-656 ◽  
pp. 898-901 ◽  
Author(s):  
Stefan Gulizia ◽  
A. Trentin ◽  
S. Vezzù ◽  
Silvano Rech ◽  
Peter King ◽  
...  
Keyword(s):  
Cold Spray ◽  
Laval Nozzle ◽  
Fine Particles ◽  
Spray Deposition ◽  
Deposition Process ◽  
Gas Temperature ◽  
Nitrogen Gas ◽  
De Laval Nozzle ◽  
Titanium Coatings ◽  
Temperature And Pressure

Cold spray is a solid state spray deposition process utilizing a supersonic De Laval nozzle to accelerate fine particles to high velocities. Particles plastically deform on impact to the substrate and to each other to create dense well adhered structures. In this study, the microstructure and mechanical properties of cold spray Titanium coatings deposited using nitrogen gas at different gas temperature and pressure were examined. In general, it was found that gas-atomised CP-titanium powder is capable of producing dense coating structures on aluminium alloy (Al6061) substrates. The micro-hardness, oxygen and nitrogen content of the coatings were found to be slightly higher than powder in the as-received condition. It was also found the coating residual stress was purely compressive when cold spray is conducted at high gas pressure and temperature.

An improved de Laval nozzle experiment

2021 ◽  
pp. 030641902110341
Author(s):  
Nicholas Goodman ◽  
Brian J Leege ◽  
Peter E Johnson
Keyword(s):  
Data Acquisition ◽  
Laval Nozzle ◽  
Flow Characteristics ◽  
Data Acquisition System ◽  
Isentropic Flow ◽  
Hands On ◽  
De Laval Nozzle ◽  
Physical Phenomena ◽  
The Impact ◽  
The Relationship

Exposing students to hands-on experiments has been a common approach to illustrating complex physical phenomena that have been otherwise modelled solely mathematically. Compressible, isentropic flow in a duct is an example of such a phenomenon, and it is often demonstrated via a de Laval nozzle experiment. We have improved an existing converging/diverging nozzle experiment so that students can modify the location of the normal shock that develops in the diverging portion to better understand the relationship between the shock and the pressure. We have also improved the data acquisition system for this experiment and explained how visualisation of the standing shock is now possible. The results of the updated system demonstrate that the accuracy of the isentropic flow characteristics has not been lost. Through pre- and post-laboratory quizzes, we show the impact on student learning as well.

TiC-TiSi2-Al2O3 composite coatings prepared by spray drying, heat treatment and plasma spraying

2021 ◽  
Vol 857 ◽  
pp. 158221
Author(s):  
Yu-duo Ma ◽  
Wei Li ◽  
Ming-yan Guo ◽  
Yong Yang ◽  
Yu-hang Cui ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Spray Drying ◽  
Plasma Spraying ◽  
Composite Coatings ◽  
Al2o3 Composite

MoS2 additive to the MAO Al2O3 composite coatings with enhanced mechanical performances

2018 ◽  
Vol 6 (1) ◽  
pp. 016543 ◽  
Author(s):  
Xin Wu ◽  
Hongxia Li ◽  
Junpeng Lu ◽  
Yangyang Li ◽  
Chengbiao Yang ◽  
...  
Keyword(s):  
Composite Coatings ◽  
Al2o3 Composite ◽  
Mechanical Performances

scholarly journals Magnetic Effects at the Edge of the Solar System: MHD Instabilities, the de Laval Nozzle Effect, and an Extended Jet

2004 ◽  
Vol 611 (1) ◽  
pp. 575-586 ◽  
Author(s):  
M. Opher ◽  
P. C. Liewer ◽  
M. Velli ◽  
L. Bettarini ◽  
T. I. Gombosi ◽  
...  
Keyword(s):  
Solar System ◽  
Laval Nozzle ◽  
Magnetic Effects ◽  
Mhd Instabilities ◽  
De Laval Nozzle

H2O beams for zinc oxide film growth produced by a Pt-catalyzed H2–O2reaction at various divergent aperture angles of a de Laval nozzle

2016 ◽  
Vol 55 (2S) ◽  
pp. 02BC12
Author(s):  
Yusuke Teraguchi ◽  
Yuki Ishidzuka ◽  
Tomoki Nakamura ◽  
Kazumasa Takahashi ◽  
Yasuhiro Tamayama ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Oxide Film ◽  
Laval Nozzle ◽  
Film Growth ◽  
Zinc Oxide Film ◽  
De Laval Nozzle ◽  
Pt Catalyzed

Asymmetric Flow Separation in de Laval Nozzle

2012 ◽  
pp. 153-158
Author(s):  
V. V. Golub ◽  
S. V. Efremov ◽  
A. S. Saveliev
Keyword(s):  
Flow Separation ◽  
Laval Nozzle ◽  
Asymmetric Flow ◽  
De Laval Nozzle
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