Preparation and Characterization of Nano-SiCP Strengthened MCrAlY Graded Coating by Laser Multi-Layer Cladding

2012 ◽  
Vol 557-559 ◽  
pp. 1937-1940
Author(s):  
Dong Sheng Wang ◽  
Zong Jun Tian ◽  
Bin Yang ◽  
Li Da Shen
Keyword(s):  
Composite Coating ◽  
Crystal Size ◽  
Vickers Microhardness ◽  
Intermetallic Alloy ◽  
Mcraly Coating ◽  
Sic Particles ◽  
Graded Coating ◽  
Formation Heat ◽  
Equiaxed Grains

Nano-SiC/MCrAlY graded coating was prepared by laser multi-layer cladding on TiAl base intermetallic alloy using composite MCrAlY powders with 1%, 2%, and 3% nano-SiC particles (mass fraction) in turn. The microstructure and microhardness of the composite coating were analyzed by means of scanning electron microscope (SEM) and Vickers microhardness tester. The results show that the microstructure of the composite coating was refined and composed of fine equiaxed grains because of addition of nanometer SiC particles, and the crystal size becomes small with increasing the nano-SiC content in the coating. In addition, due to small size and formation heat of the nano-SiC particles, SiC particles decompose and form new carbides in the coating after laser cladding. The hardness of the composite MCrAlY coating is obviously improved due to enhancement of multi-carbide and refinement of structure.

Microstructure and Wear Resistance of Laser Cladding Nano-Al2O3/MCrAlY Composite Graded Coating on TiAl Alloy

2012 ◽  
Vol 217-219 ◽  
pp. 1350-1353 ◽  
Author(s):  
Dong Sheng Wang ◽  
Zong Jun Tian ◽  
Song Lin Wang ◽  
Li Da Shen
Keyword(s):  
Wear Resistance ◽  
Laser Cladding ◽  
Wear Mechanism ◽  
Tial Alloy ◽  
Dry Sliding Wear ◽  
Hardness Tester ◽  
Mcraly Coating ◽  
Laser Cladding Process ◽  
Graded Coating ◽  
Equiaxed Grains

In this paper, the pure MCrAlY coating and nano-Al2O3 particles reinforced MCrAlY graded coating were prepared on TiAl base intermetallic alloy substrates by laser cladding process. Furthermore, the microstructure characterization, microhardness and wear resistance of the two kinds of MCrAlY coating were comparatively investigated with scanning electron microscope (SEM), HXD-1000TC hardness tester and MM-200 block-on-ring dry sliding wear tester. The results show that the laser-clad pure MCrAlY coating has a dendrite crystals characteristic. However, the graded composite MCrAlY coating consists of fine equiaxed grains because of addition of nanometer ceramic particles. Moreover, the grain size becomes small with increasing the nano-Al2O3 content in the coating. The microhardness and wear resistance of the composite coating is higher than that of the pure coating. The mainly wear mechanism of the pure MCrAlY coating is abrasive and delamination, while the mainly wear mechanism of the composites graded MCrAlY coating is abrasive.

scholarly journals Characterization Of Cerment Composite Coating Al2O3-Ni System

2019 ◽  
Vol 1294 ◽  
pp. 022011 ◽  
Author(s):  
Salih Y Darweesh ◽  
Ismael K Jassim ◽  
Amer SH Mahmood
Keyword(s):  
Composite Coating

Mechanistic Study and Characterization of Cold-Sprayed Ultra-High Molecular Weight Polyethylene-Nano-ceramic Composite Coating

2015 ◽  
Vol 25 (1-2) ◽  
pp. 160-169 ◽  
Author(s):  
Kesavan Ravi ◽  
Yuji Ichikawa ◽  
Kazuhiro Ogawa ◽  
Tiana Deplancke ◽  
Olivier Lame ◽  
...  
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Composite Coating ◽  
Ceramic Composite ◽  
Mechanistic Study ◽  
Ultra High Molecular Weight

scholarly journals EFFECT OF NANO SIC PARTICLES ON THE CHARACTERIZATION OF SIC/CU NANO-COMPOSITE

2021 ◽  
Vol 16 (61) ◽  
pp. 1111-1121
Author(s):  
M.A. Metwally ◽  
M. M. Sadawy ◽  
M. Ghanem ◽  
I.G. El-Batanony
Keyword(s):  
Nano Composite ◽  
Sic Particles

Structure Characterization of Sintered CaO-Al2O3-SiO2 Glass-Ceramic Reinforced with Spodumene

2013 ◽  
Vol 834-836 ◽  
pp. 309-314
Author(s):  
Zi Fan Xiao ◽  
Jin Shu Cheng ◽  
Jun Xie
Keyword(s):  
Glass Ceramic ◽  
Energy Dispersive Spectrometry ◽  
Crystal Size ◽  
Bending Strength ◽  
Glass Ceramics ◽  
Structure Characterization ◽  
X Ray Diffraction ◽  
Crystalline Phases ◽  
X Ray

A glass-ceramic belonging to the CaO-Al2O3-SiO2(CAS) system with different composition of spodumene and doping the Li2O with amount between 0~2.5 % (mass fraction) were prepared by onestage heat treatment, under sintering and crystallization temperature at 1120 °C for two hours. In this paper, differential thermal analysis, X-ray diffraction, scanning electron microscopy, energy dispersive spectrometry and bending strength test were employed to investigate the microstructure and properties of all samples. β-wollastonite crystals were identified as the major crystalline phases, and increasing Li2O was found to be benefit for the crystallization and tiny crystalline phases remelting, resulting in the content of major crystalline phases increased first and then decreased with increasing the expense of spodumene. Meanwhile, the crystal size can be positively related with the content of Li2O. The preferable admixed dosage of spodumene can be obtained, besides the strength of glass-ceramics can be more than 90 MPa.

Physicochemical characterization of Pt and Ir particles deposited on Ce(1-x)Ru(x)O2 solid-solutions for CO oxidation

MRS Advances ◽  
2019 ◽  
Vol 4 (61-62) ◽  
pp. 3433-3440
Author(s):  
E. Gonzalez-A ◽  
R. Rangel ◽  
J. Lara ◽  
J. J. Alvarado ◽  
P. Bartolo
Keyword(s):  
Solid Solutions ◽  
Crystal Size ◽  
Sol Gel ◽  
Physicochemical Characterization ◽  
Metallic State ◽  
Wet Impregnation ◽  
Iridium Nanoparticles ◽  
Gel Technique ◽  
Near Future

AbstractPt/Ce1-xRuxO2 and Ir/Ce1-xRuxO2 catalysts were prepared through the sol-gel technique, under microwave heating. In a first step, the Ce1-xRuxO2 solid solutions were prepared. Subsequently, an incipient wet impregnation process was carried out to homogeneously achieve the dispersion, either of platinum or iridium nanoparticles. The Pt/Ce1-xRuxO2 and Ir/Ce1-xRuxO2 catalysts were characterized by means of SEM, XRD, XPS, TEM, and specific surface area measurements. Crystal size and shifting into the CeO2 structure were detected after ruthenium doping producing the Ce1-xRuxO2 solid-solutions. Trough XPS technique Pt and Ir nanoparticles were found evenly dispersed in a metallic state. Those features allow us to foresee that, in the near future, these materials could be used efficiently as catalysts for oxidation process.

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