Study of YSZ/Al2O3 Composite Coatings Produced by Electrophoretic Deposition

2012 ◽  
Vol 538-541 ◽  
pp. 386-390
Author(s):  
Xiao Juan Lu
Keyword(s):  
Mechanical Properties ◽  
Milling Time ◽  
Particle Distribution ◽  
Composite Coatings ◽  
Deposition Process ◽  
Gradient Structure ◽  
Constraint Effect ◽  
Attrition Milling ◽  
Al2o3 Composite ◽  
Different Temperatures

YSZ/Al2O3 composite coatings have been fabricated by using EPD. The microstructures, mechanical properties and micro-stresses of the coatings produced from different sized powders and sintered at different temperatures have been studied. Different attrition milling time leads to different particle distribution modes, thereby different microstructures. Due to the deposition process and the constraint effect from the substrate, a gradient structure has been formed across the coating thickness.

Fabrication of Zirconia Coatings using Electrophoretic Deposition and Reactive Sintering

2002 ◽  
Vol 750 ◽  
Author(s):  
Ying Yuan ◽  
Xin Wang ◽  
Ping Xiao
Keyword(s):  
Particle Size ◽  
Thermal Treatment ◽  
Electrophoretic Deposition ◽  
Powder Mixture ◽  
Milling Time ◽  
Composite Coatings ◽  
Thermal Analyses ◽  
Reactive Sintering ◽  
Attrition Milling ◽  
Al Composite

ABSTRACTElectrophoretic deposition (EPD) technique has been used to fabricate green YSZ/Al composite coatings with controlled thickness and morphology. Such green coating was transformed into the YSZ/Al2O3 composite coating during following thermal treatment in air at temperatures up to 1200°C. Suspension for EPD was prepared by attrition-milling a mixture of yttria -stabilised zirconia (YSZ) and aluminium (Al) in acetyl-acetone (ACAC). The attrition milling reduced the particle size of the powder mixture. A mechanical alloying behaviour is believed to control the agglomeration and the breaking of large Al particles. Attrition milling also reduced the YSZ crystallite size, which can be attributed to the chemical reaction between YSZ/Al particles and ACAC. Thermal analyses and dilatometry measurements of the green compact indicate the temperature range for oxidation of Al and its effect on sintering of the coating. The coating obtained from EPD in the suspension after a longer milling time was found to have more uniform in microstructure.

scholarly journals Influence of LBE Temperatures on the Microstructure and Properties of Crystalline and Amorphous Multiphase Ceramic Coatings

Coatings ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 543
Author(s):  
Yong Chen ◽  
Liangbin Hu ◽  
Changjun Qiu ◽  
Bin He ◽  
Lihua Zhou ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Composite Coating ◽  
Composite Coatings ◽  
Ceramic Coatings ◽  
Flame Spraying ◽  
Liquid Lead ◽  
In Situ Reaction ◽  
Chemical Phase ◽  
Different Temperatures

An Al2O3–TiO2 amorphous composite coating with a thickness of 100–120 μm was fabricated on China low activation martensitic steel (CLAM steel) by oxygen acetylene flame spraying technology and the laser in-situ reaction method. We investigated the microstructures and mechanical properties of the coating after liquid lead-bismuth eutectic (LBE) alloy corrosion under different temperatures for 300 h and found that the corrosion temperature of the LBE had no observable effect on the microstructure and chemical phase of the Al2O3–TiO2 amorphous composite coatings. However, the mechanical properties (micro-hardness and shear strength) of the Al2O3–TiO2 multiphase coating deteriorated slightly with the increase in the immersion temperature of the LBE. As a result of oxygen acetylene flame spraying and laser in-situ reaction technology, it was found that the Al2O3–TiO2 amorphous composite coating exhibits an excellent LBE corrosion resistance, which is a candidate structural material for the accelerator-driven subcritical system (ADS) to handle nuclear waste under extreme conditions.

scholarly journals Microstructure and Mechanical Properties of Zn-Ni-Al2O3 Composite Coatings

Materials ◽  
2018 ◽  
Vol 11 (5) ◽  
pp. 853 ◽  
Author(s):  
Yang Bai ◽  
Zhenhua Wang ◽  
Xiangbo Li ◽  
Guosheng Huang ◽  
Caixia Li ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Composite Coatings ◽  
Microstructure And Mechanical Properties ◽  
Al2o3 Composite

Preparation of Fe Coating Al2O3 Nanometer Composite Powder and its Mechanical Properties after Hot Press Sintering

2010 ◽  
Vol 105-106 ◽  
pp. 16-19 ◽  
Author(s):  
Hong Xia Lu ◽  
Zhang Wei ◽  
Rui Zhang ◽  
Hong Liang Xu ◽  
Hai Long Wang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Raw Materials ◽  
Precipitation Method ◽  
Hot Press ◽  
Composite Ceramics ◽  
Composite Powders ◽  
Al2o3 Composite ◽  
Fe Content ◽  
Different Temperatures ◽  
Hot Press Sintering

Nano-Fe particles coating Al2O3 composite powders were prepared by heterogeneous precipitation method with nanometer -Al2O3 and Fe(NO3)3•9H2O as raw materials. The composite powders were analyzed by DSC-TG, XRD,SEM and Zeta potential. Results showed that Fe coating Al2O3 nanometer composite powders were obtained in the condition of being sintered at 500°C for 30min and reduced at 700°C for 1h in H2. The coating Fe nanometer particles are in the shape of sphericity with diameter about 30nm and the dispersion of the powders is uniform. Al2O3/Fe composite ceramics were obtained by hot-pressing (30MPa). The mechanical properties of the composite were investigated after hot press at different temperatures. With the increasing of Fe content in composite ceramics, the hardness of the composite is decreased. Fracture toughness of 10mol%Fe content is 5.62MPa after sintered at 1400°C, which is increasing 57% high than that of monolithic Al2O3 ceramics.

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