Ceramics reinforced metal base composite coatings produced by CO 2 laser cladding

2007 ◽  
Author(s):  
Xichen Yang ◽  
Yu Wang ◽  
Nan Yang
Keyword(s):  
Laser Cladding ◽  
Composite Coatings ◽  
Metal Base ◽  
Base Composite

Laser cladding Ni-base composite coatings reinforced by in-situ synthesized multiple carbide particles

2008 ◽  
Author(s):  
Ruiquan Kang ◽  
Mingxing Ma ◽  
Wenjin Liu ◽  
Minlin Zhong ◽  
Yide Kan ◽  
...  
Keyword(s):  
Laser Cladding ◽  
Composite Coatings ◽  
Base Composite ◽  
Carbide Particles

CRACKING BEHAVIOR OF CERAMIC PARTICLES REINFORCED NI-BASE ALLOYS COMPOSITE COATING BY LASER CLADDING

2005 ◽  
Vol 12 (01) ◽  
pp. 7-12 ◽  
Author(s):  
WEIPING ZHANG ◽  
SHUO LIU
Keyword(s):  
Laser Cladding ◽  
Metal Matrix ◽  
Composite Coatings ◽  
Medium Carbon Steel ◽  
Coating Materials ◽  
Cracking Behavior ◽  
The Matrix ◽  
Base Composite ◽  
The Difference ◽  
Transformation Stress

In-situ synthesized TiB2 particles reinforced Ni-base composite coatings with different compositions were fabricated on medium carbon steel using laser cladding. Cracking behavior in different coatings was studied by microanalysis. Results show that the coating quality is good with optimal laser parameters and coating compositions; whereas the cracks formed in the coating with high content of ceramic phases mainly include the following: the transcrystalline cracks in the bonding metal matrix, the high density cracks in the edge of the coating, micro-cracks on the interface of the matrix and the hardy ceramic phases and in the vicinity of the bonding interface in the heat-affected zone etc. Cracking behavior in the coating is mainly attributed to the thermal stress induced by the difference of the thermal expansion coefficient of the coating materials and the metal matrix, and the phase transformation stress plays an important role too.

Nanoparticulate-Reinforced Ti-Base Composites Prepared by Laser Cladding

2012 ◽  
Vol 497 ◽  
pp. 311-314 ◽  
Author(s):  
Wei Fu Wang
Keyword(s):  
Laser Cladding ◽  
Composite Coatings ◽  
Fracture Morphology ◽  
Powder Mixtures ◽  
Average Hardness ◽  
Hardness Tests ◽  
Peculiar Characteristic ◽  
Base Composite ◽  
Titanium Alloy Substrate ◽  
In Suit

With preplaced Ti-8Al-1Mo-1V + BN powder mixtures, the Ti-base composite coatings with in-suit synthesis nano particulates were obtained by laser cladding on titanium alloy substrate. The microstructures, fracture morphology, phase composition and mechanical property were studied by SEM, XRD and micro-hardness tests. The results show that, there are two kinds of typical nano particulates in the composites, i.e. the TiB with a diameter of ~400nm and the Ti2N with a diameter of ~10 nm. Both the TiB and Ti2N reinforced particulates are uniformly distributed in the composites. As a result, the average hardness of the composites were ~360HV0.05 which is about 20% higher than the substrate. In the composites, the distribution of Ti2N particulates shows a peculiar characteristic of dendrite-like morphologies. The analysis shows that the Ti2N precipitates out from the solid state α-Ti(N) is the reason why Ti2N is only of a diameter of ~10nm and distributes in a certain way of dendrite-like morphologies.

scholarly journals Isothermal Oxidation Performance of Laser Cladding Assisted with Preheat (LCAP) Tribaloy T-800 Composite Coatings Deposited on EN8

Coatings ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 843
Author(s):  
Sipiwe Trinity Nyadongo ◽  
Sisa Lesley Pityana ◽  
Eyitayo Olatunde Olakanmi
Keyword(s):  
Iron Oxide ◽  
Composite Coating ◽  
Laser Cladding ◽  
Composite Coatings ◽  
Parabolic Rate Constant ◽  
Mass Gain ◽  
Isothermal Oxidation ◽  
Operational Parameters ◽  
Temperature Oxidation ◽  
Service Environments

It is anticipated that laser cladding assisted with preheat (LCAP)-deposited Tribaloy (T-800) composite coatings enhances resistance to structural degradation upon exposure to elevated-temperature oxidation service environments. The oxidation kinetics of LCAP T-800 composite coatings deposited on EN8 substrate and its mechanisms have not been explored in severe conditions that are similar to operational parameters. The isothermal oxidation behaviour of the T-800 composite coating deposited on EN8 via LCAP was studied at 800 °C in air for up to 120 h (5 × 24 h cycles) and contrasted to that of uncoated samples. The mass gain per unit area of the coating was eight times less than that of the uncoated EN8 substrate. The parabolic rate constant (Kp) for EN8 was 6.72 × 10−12 g2·cm−4·s−1, whilst that for the T-800 composite coating was 8.1 × 10−13 g2·cm−4·s−1. This was attributed to a stable chromium oxide (Cr2O3) layer that formed on the coating surface, thereby preventing further oxidation, whilst the iron oxide film that formed on the EN8 substrate allowed the permeation of the oxygen ions into the oxide. The iron oxide (Fe2O3) film that developed on EN8 spalled, as evidenced by the cracking of oxide when the oxidation time was greater than 72 h, whilst the Cr2O3 film maintained its integrity up to 120 h. A parabolic law was observed by the T-800 composite coating, whilst a paralinear law was reported for EN8 at 800 °C up to 120 h. This coating can be used in turbine parts where temperatures are <800 °C.

Phase transformation and tribological properties of Ag-MoO 3 contained NiCrAlY based composite coatings fabricated by laser cladding

2017 ◽  
Vol 93 ◽  
pp. 79-86 ◽  
Author(s):  
Lingqian Wang ◽  
Jiansong Zhou ◽  
Benbin Xin ◽  
Youjun Yu ◽  
Shufang Ren ◽  
...  
Keyword(s):  
Phase Transformation ◽  
Laser Cladding ◽  
Tribological Properties ◽  
Composite Coatings
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