In situ formation of metal-ceramic composite coatings by detonation spraying of titanium

2014 ◽  
Author(s):  
V. Yu. Ulianitsky ◽  
D. V. Dudina ◽  
I. S. Batraev ◽  
N. V. Bulina ◽  
A. I. Kovalenko ◽  
...  
Keyword(s):  
Ceramic Composite ◽  
Composite Coatings ◽  
Detonation Spraying ◽  
Metal Ceramic ◽  
In Situ Formation

Corrosion resistant metal-ceramic composite coatings for tribological applications

2021 ◽  
pp. 1-34
Author(s):  
Peter Renner ◽  
Swarn Jha ◽  
Yan Chen ◽  
Tariq Chagouri ◽  
Serge Kazadi ◽  
...  
Keyword(s):  
Ceramic Composite ◽  
Low Cost ◽  
Composite Coatings ◽  
Salt Spray ◽  
Extreme Environments ◽  
Safe Procedure ◽  
Corrosion Resistant ◽  
Wide Range ◽  
Metal Ceramic ◽  
Corrosion Resistant Coatings

Abstract Effective design of corrosion-resistant coatings is critical for the protection of metals and alloys. Many state-of-the-art corrosion-resistant coatings are unable to satisfy the challenges in extreme environments for tribological applications, such as elevated or cryogenic temperatures, high mechanical loads and impacts, severe wear, chemical attack, or a combination of these. The nature of challenging conditions demands that coatings have high corrosion and wear resistance, sustained friction control, and maintain surface integrity. In this research, multi-performance metal-ceramic composite coatings were developed for applications in harsh environments. These coatings were developed with an easy to fabricate, low-cost, and safe procedure. The coating consisted of boron nitride, graphite, silicon carbide, and transition metals such as chromium or nickel using epoxy as vehicle and bonding agent. Salt spray corrosion tests showed that 1010 carbon steel (1/4 hard temper) substrates lost 20-100× more mass than the coatings. The potentiodynamic polarization study showed better performance of the coatings by seven orders of magnitude in terms of corrosion relative to the substrate. Additionally, the corrosion rates of the coatings with Ni as an additive were five orders of magnitude lower than reported. The coefficient of friction of coatings was as low as 0.1, five to six times lower than that of epoxy and lower than a wide range of epoxy resin-based coatings found in literature. Coatings developed here exhibited potential in applications in challenging environments for tribological applications.

On the Elaboration of Metal-Ceramic Composite Coatings by Laser Cladding

2016 ◽  
Vol 879 ◽  
pp. 1288-1293 ◽  
Author(s):  
Anne Mertens ◽  
Thibaut L’Hoest ◽  
Julien Magnien ◽  
Raoul Carrus ◽  
Jacqueline Lecomte-Beckers
Keyword(s):  
Mechanical Properties ◽  
Laser Cladding ◽  
Ceramic Composite ◽  
Composite Coatings ◽  
Preliminary Investigation ◽  
Metallic Matrix ◽  
Stainless Steel 316L ◽  
Additive Process ◽  
Silicon Carbides ◽  
Metal Ceramic

This paper reports on a preliminary investigation into the elaboration, by the additive process known as laser cladding, of composite coatings with a matrix of stainless steel 316L reinforced with varying contents of tungsten (WC) or silicon carbides (SiC) particles. Laser cladding is characterised by ultra-fast solidification and cooling rates, thus giving rise to ultra-fine out-of-equilibrium microstructures and potentially enhanced mechanical properties. Both types of composite coatings – i.e. with SiC or WC ‒ are compared in terms of their microstructures and hardness. Special attention is given to the dissolution of the carbides particles and to interfacial reactions taking place between the particles and the metallic matrix.

In Situ Synthesis of Rod-Like Tielite / Alumina Ceramic Composites via Mechanical Activation

2007 ◽  
Vol 352 ◽  
pp. 111-114
Author(s):  
Xiao Hu Chen ◽  
Xiao Min Chen ◽  
Huang Zhao ◽  
Ji Huai Wu
Keyword(s):  
Composite Materials ◽  
Mechanical Activation ◽  
Ceramic Composite ◽  
Ceramic Composites ◽  
Al2o3 Ceramic ◽  
Longitudinal Length ◽  
In Situ Formation ◽  
Ceramic Composite Materials ◽  
Α Al2o3

The purpose of this paper is to investigate the possibility of rod-like Al2TiO5 / α-Al2O3 composites in situ formation via a mechanical activation process. A QM-ISP-4 Planetary Mill was employed to activate mechanically the mixtures of anatase and corundum in air at room temperature for different times. The milled powder mixtures were pressed into platelets and then sintered in air at 1300°C for 3 h. The XRD results showed that only Al2TiO5 and α-Al2O3 phases could be detected in the sintered samples when the activated time reached 30 hours. The SEM observations illustrated the unusual microstructure of Al2TiO5 / α-Al2O3 ceramic composite materials. Abnormal grains with longitudinal length ~10 μm23 transversal length ~1 μm and equiaxed matrix grains of ~3 μm on an average were observed. EDXA proved that the rod-like grains and the fine equiaxed matrix grains were composed of Al2TiO5 and α-Al2O3, separately. The roles of anisotropic grain growth caused by mechanical activation are discussed for the in situ formation of rod-like Al2TiO5 / α-Al2O3 ceramic composite materials.

Hot Corrosion of NiCrAlY/(ZrO2-CeO2-Y2O3) Composite Coatings in NaCl-Na2SO4 Molten Salt

2010 ◽  
Vol 658 ◽  
pp. 228-231 ◽  
Author(s):  
Jae Ho Lee ◽  
Dong Bok Lee
Keyword(s):  
Corrosion Resistance ◽  
Molten Salt ◽  
Hot Corrosion ◽  
Ceramic Composite ◽  
Composite Coatings ◽  
Air Plasma Spray ◽  
Air Plasma ◽  
Coating Surface ◽  
Metal Ceramic ◽  
Sprayed Coatings

The metal/ceramic composite coatings that consisted of (Ni-22Cr-10Al-1Y) and (ZrO2-25CeO2-2.5Y2O3) were prepared by the air plasma spray (APS) method. The as-sprayed coatings consisted of metal-rich and ceramic-rich regions, between which the -Al2O3 oxide stringers existed owing to the oxidation of Al in (Ni-22Cr-10Al-1Y) during APS. The composite coatings were hot corroded at 800 and 900 oC for up to 50 h in 75%NaCl-25%Na2SO4 molten salt. The corrosion products that formed on the coating surface during hot corrosion were mostly dissolved off into the molten salt. The scales that remained on the coating surface consisted primarily of Cr2O3, and a lesser amount of NiO and Al2O3. The corrosion resistance decreased, as not only the test temperature and time but also the amount of metal in the coating increased.

Laser Induced in-situ Formation of Titanium Composite Coatings

2009 ◽  
Vol 36 (12) ◽  
pp. 3272-3276 ◽  
Author(s):  
梁京 Liang Jing ◽  
高明媛 Gao Mingyuan ◽  
刘常升 Liu Changsheng ◽  
陈岁元 Chen Suiyuan ◽  
赵倩 Zhao Qian
Keyword(s):  
Composite Coatings ◽  
In Situ Formation
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