Composite Coatings Elaborated by Plasma Spraying of Dry Coated Particles

2007 ◽  
Vol 560 ◽  
pp. 67-72 ◽  
Author(s):  
R. Cuenca-Alvarez ◽  
H. Ageorges ◽  
Pierre Fauchais
Keyword(s):  
Stainless Steel ◽  
Plasma Spraying ◽  
Composite Coatings ◽  
Metallic Matrix ◽  
Oxide Content ◽  
Properties Of Coatings ◽  
Ceramic Particles ◽  
Metallic Particles ◽  
Particle Coating ◽  
Α Al2o3

The influence of dry particle coating on the properties of coatings produced by d.c. arc plasma spraying is reported. A mechanofusion process is used to coat coarser metallic particles with fine ceramic particles without using either binders or solvents. The key parameters affecting the mechanofusion process and the corresponding plasma spraying method have been varied in order to increase the hardness of the resulting composite coatings. Efforts have been made to disperse homogeneously hard particles (α-Al2O3, SiC) into a metallic matrix (316L stainless steel) and check if it is possible to limit the oxidation of metallic particles during their flight in the plasma jet flowing in air. The hardness of resulting composite coatings depends on the metallic particle size even when the hard ceramic particles are homogenously dispersed into the metallic matrix. Spraying mechanofused powder composed of finer stainless steel particles (64 ,m), results in finer structured deposits that show a higher oxide content. On the contrary, a low oxidation rate of the metallic matrix is observed when coarser metallic particles (120 ,m), covered by a binary layer of α-Al2O3 and SiC are sprayed.

scholarly journals Microstructure of Coatings on Nickel and Steel Platelets Obtained by Co-Milling with NiAl and CrB2 Powders

Materials ◽  
2019 ◽  
Vol 12 (16) ◽  
pp. 2593
Author(s):  
Maciej Szlezynger ◽  
Jerzy Morgiel ◽  
Łukasz Maj ◽  
Olena Poliarus ◽  
Paweł Czaja
Keyword(s):  
Stainless Steel ◽  
Plasma Spraying ◽  
Composite Coatings ◽  
Atmospheric Plasma ◽  
Metallic Surfaces ◽  
Fine Ceramic ◽  
Optical Scanning ◽  
Transmission Electron ◽  
Powder Particles ◽  
Thick Coatings

Metal matrix composite coatings are developed to protect parts made from materials susceptible to wear, like nickel alloys or stainless steel. The industry-established deposition method is presently an atmospheric plasma spraying method since it allows the production of both well-adhering and thick coatings. Alternatively, similar coatings could be produced by co-milling of ceramic and alloyed powders together with metallic plates serving as substrates. It results in mechanical embedding of the powder particles into exposed metallic surfaces required coatings. The present experiment was aimed at the analysis of microstructure of such coatings obtained using NiAl and CrB2 powders. They were loaded together with nickel and stainless steel platelets into ball mill vials and rotated at 350 rpm for up to 32 h. This helped to produce coatings of a thickness up to ~40 µm. The optical, scanning, and transmission electron microscopy observations of the coatings led to conclusion that the higher the rotation speed of vials, the wider the intermixing zone between the coating and the substrate. Simultaneously, it was established that the total thickness of the coating deposited at specified conditions is limited by the brittleness of its nanocrystalline matrix. An increase in the hardness of the substrate results in a decrease of the intermixing zone. The above results indicate that even as the method based on mechanical embedding could so far produce thinner coatings than the plasma spraying, in the former case they are characterized by a more uniform nanocrystalline matrix with homogenously distributed fine ceramic particles.

Process and Properties of Pulse Electrodeposited RE-Ni-W-P-SiC Composite Coatings

2008 ◽  
Vol 41-42 ◽  
pp. 385-388
Author(s):  
Xiao Yun Zhu ◽  
Zhong Cheng Guo
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Rare Earth ◽  
Direct Current ◽  
Pulse Current ◽  
Composite Coatings ◽  
Pulse Frequency ◽  
Duty Ratio ◽  
Properties Of Coatings ◽  
Better Than

Process and properties of pulse electrodeposited RE-Ni-W-P-SiC composite coatings were studied. The results show that the deposited rate by pulse current is larger than that by direct current; the deposited coatings by pulse current are better than that by direct current in corrosion resistance and microhardness. And the corrosion resistance of the coatings with pulse current is better than that of stainless steel (1Cr18Ni9Ti). The duty ratio and the pulse frequency in the process of electrodeposition have a large influence on the deposition rate, the composition and the properties of coatings. SEM measurement shows that the crystals with pulse current are smaller and the surface is smoother than that by direct current. It is beneficial to make crystalline grain finer by mixing rare earth.

scholarly journals Microstructure Characteristics and Properties of HVOF Sprayed Ni-Based Alloy Nano-h-BN Self-Lubricating Composite Coatings

2015 ◽  
Vol 2015 ◽  
pp. 1-6 ◽  
Author(s):  
Xiaofeng Zhang ◽  
Long Zhang ◽  
Zhenyi Huang
Keyword(s):  
Solid Lubricant ◽  
Composite Coatings ◽  
Metallic Matrix ◽  
Medium Carbon Steel ◽  
High Velocity Oxygen Fuel ◽  
Hvof Spraying ◽  
Properties Of Coatings ◽  
Medium Carbon ◽  
Microstructure Characteristics ◽  
Oxygen Fuel

A Ni-based alloy/nano-h-BN self-lubricating composite coating was produced on medium carbon steel by high velocity oxygen fuel (HVOF) spraying technique. The powder feedstocks for HVOF spraying were prepared by ball milling and agglomerated the nano-h-BN with Ni-based alloy powders. The microstructure and mechanical properties of coatings have been investigated. With the increasing of h-BN contents, some delaminations appeared gradually in the coatings and a continuous network with h-BN phase embedded formed in the metallic matrix. The average microhardness of the self-lubricating coating was a little lower for the addition of soft solid lubricant. The friction coefficient of coatings is in the ranges of 0.38–0.48 and 0.38–0.52 at ambient temperature and 400°C, respectively. The maximum bonding strength of coatings reached 23.83 MPa.

Influence of Plasma Spraying Parameters on Coating Damage

2000 ◽  
Author(s):  
L. Bianchi ◽  
N. Baradel ◽  
N. Llorca-Isern ◽  
G. Bertran-Vidai
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Thermal Cycling ◽  
Plasma Spraying ◽  
Confocal Microscope ◽  
Properties Of Coatings ◽  
Low Viscosity ◽  
Spraying Parameters ◽  
Substrate Properties ◽  
Coating Microstructure

Abstract The influence of plasma spraying parameters on the mechanical properties of coatings has been studied. ZrO2-Y2O3 coatings were sprayed onto stainless steel and aluminium substrates at temperatures of about 75°C and 225°C. An original set of samples, facilitating the measurement of substrate deflection, was used to evaluate the effect of thermal cycling under different spraying conditions. In order to correlate thermal cycling values and mechanical properties to coating microstructure, the coatings were impregnated with low-viscosity resin and examined under a confocal microscope. The results reveal the influence of spraying temperature, substrate properties, and torch-substrate velocity on coating damage.

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

scholarly journals Improving the microstructure and mechanical properties of laser cladded Ni-based alloy coatings by changing their composition: A review

2020 ◽  
Vol 59 (1) ◽  
pp. 340-351
Author(s):  
Lin Yinghua ◽  
Ping Xuelong ◽  
Kuang Jiacai ◽  
Deng Yingjun
Keyword(s):  
Mechanical Properties ◽  
Wear Resistance ◽  
Corrosion Resistance ◽  
Rare Earth ◽  
Composite Coatings ◽  
Single Element ◽  
Properties Of Coatings ◽  
Hard Particles ◽  
Microstructure And Mechanical Properties ◽  
Nickel Based Alloy

AbstractNi-based alloy coatings prepared by laser cladding has high bonding strength, excellent wear resistance and corrosion resistance. The mechanical properties of coatings can be further improved by changing the composition of alloy powders. This paper reviewed the improved microstructure and mechanical properties of Ni-based composite coatings by hard particles, single element and rare earth elements. The problems that need to be solved for the particle-reinforced nickel-based alloy coatings are pointed out. The prospects of the research are also discussed.

Sign in / Sign up

Export Citation Format

Share Document