Damage of aluminum samples with alumina ceramic coating under pulsed energy flows of various nature

2018 ◽  
pp. 15-27 ◽  
Author(s):  
V. A. Gribkov ◽  
◽  
A. S. Demin ◽  
N. A. Epifanov ◽  
E. E. Kazilin ◽  
...  
Keyword(s):  
Ceramic Coating ◽  
Alumina Ceramic ◽  
Energy Flows

Laser Cladding of Alumina Material Coating: Effects on Deposition Quality

2016 ◽  
Author(s):  
Yuzhou Li ◽  
Weilong Cong ◽  
Fuda Ning ◽  
Rongxia Huang
Keyword(s):  
Laser Cladding ◽  
High Performance ◽  
Ceramic Coating ◽  
High Hardness ◽  
Alumina Ceramic ◽  
Properties Of Coatings ◽  
Surface Protection ◽  
Laser Head ◽  
Coating Methods ◽  
Input Variables

Alumina ceramic is a high performance engineering material with excellent properties, including high melting point, high hardness and brittle nature make the alumina ceramic difficult to machine and needing high cost by using conventional manufacturing methods. Coating is an important method for alumina fabrication. The excellent properties of coatings can be used for special surface protection and ceramic parts repairing. Comparing with other coating methods, laser cladding method has many good properties to overcome the drawbacks. The reported investigations on laser cladding provide little information about alumina materials for ceramic coating. In this paper, effects of different input variables of laser cladding of alumina materials for ceramic coating were studied. And this paper for the first time reported the relationship between the properties (including surface roughness, flatness and powder efficiency) and input variables such as laser power, powder feeding rate and laser head moving rate. The obtained results will be helpful to establish efficient and effective processes for ceramics coating.

Preparation and performance of alumina ceramic coating doped with aluminum nitride by micro arc oxidation

2020 ◽  
Vol 46 (10) ◽  
pp. 17112-17116 ◽  
Author(s):  
Wei Yang ◽  
Shangkun Wu ◽  
Dapeng Xu ◽  
Wei Gao ◽  
Yuhong Yao ◽  
...  
Keyword(s):  
Aluminum Nitride ◽  
Ceramic Coating ◽  
Alumina Ceramic ◽  
Micro Arc Oxidation ◽  
And Performance

Laser-induced deposition of alumina ceramic coating on stainless steel from dry thin films for surface modification

2014 ◽  
Vol 40 (4) ◽  
pp. 6151-6156 ◽  
Author(s):  
Y. Adraider ◽  
Y.X. Pang ◽  
F. Nabhani ◽  
S.N. Hodgson ◽  
M.C. Sharp ◽  
...  
Keyword(s):  
Thin Films ◽  
Stainless Steel ◽  
Surface Modification ◽  
Ceramic Coating ◽  
Alumina Ceramic

Influence of the Alumina Ceramic Coating on Friction and Stability of the Iron Contacts

2020 ◽  
Vol 143 (3) ◽  
Author(s):  
Le Van Sang ◽  
Natsuko Sugimura ◽  
Hitoshi Washizu
Keyword(s):  
Smoothed Particle Hydrodynamics ◽  
Ceramic Coating ◽  
Coating Layer ◽  
Substrate Surface ◽  
Alumina Ceramic ◽  
Alumina Coatings ◽  
Coated Particles ◽  
Particle Hydrodynamics ◽  
Smoothed Particle ◽  
Coated Surface

Abstract The study focuses on monitoring influence of the alumina coatings on friction and stability of the microscale iron contacts by the smoothed particle hydrodynamics. The obtained results show a better stability and a higher value of the friction coefficient of the coated surface compared to those of the uncoated one. This study also supposes that in concern of stability of the surface the coating should be done with only the substrate surface accompanied with the roughness of the coating layer. The proportion of the coated particles is found to be strongly resulting in the friction properties, and the roughness of the coating layer also slightly results in those. The surface reaches the most stability at the proportion of around 70%.

Process Parameters Optimization for Micro-Arc Oxidation of Hot-Dip Aluminum Coating on Stainless Steel

2010 ◽  
Vol 135 ◽  
pp. 190-193
Author(s):  
Zong Wei Niu ◽  
Zhi Yong Li ◽  
F.F. Wang ◽  
Jia You Zhang ◽  
Ai Hong Wang
Keyword(s):  
Stainless Steel ◽  
Process Parameters ◽  
Ceramic Coating ◽  
Aluminum Film ◽  
Alumina Ceramic ◽  
Parameters Optimization ◽  
Duty Ratio ◽  
Main Process ◽  
Action Time ◽  
Micro Arc Oxidation

Alumina ceramic coating was gained by micro-arc oxidation of hot-dip aluminum film on stainless steel. The main properties indexes of ceramic coating include the thickness, the hardness and the surface roughness. The main process parameters determine above properties include the electric current density, the duty ratio of the pulse, the frequency of the pulse and the action time. The artificial neural network model was established to forecast the properties and optimize the process parameters for the micro-arc oxidation of aluminum film. Experimental results proved that the optimization model has high veracity and can be applied to the choice of process parameters.

Characterization of thermal barrier coatings formed by electon-beam physical vapor deposition (EB-PVD)

1989 ◽  
Vol 47 ◽  
pp. 426-427
Author(s):  
Ozer Unal
Keyword(s):  
Thermal Barrier Coatings ◽  
Physical Vapor Deposition ◽  
Ceramic Coating ◽  
High Vacuum ◽  
Ceramic Coatings ◽  
High Energy ◽  
Thermal Barrier ◽  
Protective Oxide ◽  
Barrier Coatings ◽  
Energy Beam

Interest in ceramics as thermal barrier coatings for hot components of turbine engines has increased rapidly over the last decade. The primary reason for this is the significant reduction in heat load and increased chemical inertness against corrosive species with the ceramic coating materials. Among other candidates, partially-stabilized zirconia is the focus of attention mainly because ot its low thermal conductivity and high thermal expansion coefficient.The coatings were made by Garrett Turbine Engine Company. Ni-base super-alloy was used as the substrate and later a bond-coating with high Al activity was formed over it. The ceramic coatings, with a thickness of about 50 μm, were formed by EB-PVD in a high-vacuum chamber by heating the target material (ZrO2-20 w/0 Y2O3) above its evaporation temperaturef >3500 °C) with a high-energy beam and condensing the resulting vapor onto a rotating heated substrate. A heat treatment in an oxidizing environment was performed later on to form a protective oxide layer to improve the adhesion between the ceramic coating and substrate. Bulk samples were studied by utilizing a Scintag diffractometer and a JEOL JXA-840 SEM; examinations of cross-sectional thin-films of the interface region were performed in a Philips CM 30 TEM operating at 300 kV and for chemical analysis a KEVEX X-ray spectrometer (EDS) was used.

Porous Alumina Ceramic Prepared by HEMA-TBA Gelcasting System

2017 ◽  
Vol 32 (7) ◽  
pp. 731 ◽  
Author(s):  
XIE Yu-Zhou ◽  
PENG Chao-Qun ◽  
WANG Xiao-Feng ◽  
WANG Ri-Chu ◽  
LUO Feng
Keyword(s):  
Porous Alumina ◽  
Alumina Ceramic
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