Laser remelting of plasma sprayed nanostructured Al2O3–TiO2 coatings at different laser power

In this study, Ni60/Ni-WC composite coatings were first prepared by plasma spraying. Then, the coatings were remelted successively with a CO2 laser. The influences of laser power on the microstructural characterization and microhardness of the coatings were investigated. The results show that the defects of as-sprayed coating like lamellar stacking microstructure and pores were eliminated by laser remelting, and the remelted coating possessed a denser microstructure. With the increase of the laser power, the burning loss and dissolve of the WC particles is increased, while the dilution rate of the coating becomes large. The laser-remelted samples had higher hardness than the as-sprayed one. Laser power has a great impact on the coating and an optimized process parameter is helpful to achieve appropriate melting of WC particles, which leads to retain a high proportion of hard phase in the coating, good combination between the WC particles and Ni-base matrix alloy, and high microhardness.

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BONDING ZONE MORPHOLOGIES CHARACTERISTICS OF LASER REMELTED HA COATINGS

Surface Review and Letters ◽

10.1142/s0218625x0600861x ◽

2006 ◽

Vol 13 (05) ◽

pp. 655-660

Author(s):

DIANGANG WANG ◽

CHUANZHONG CHEN ◽

QUANHE BAO ◽

LIANG ZHANG ◽

TINGQUAN LEI

Keyword(s):

Laser Power ◽

Electron Probe ◽

Scanning Speed ◽

Laser Remelting ◽

Element Analysis ◽

Transition Layers ◽

Bonding State ◽

Electron Probe Microanalyzer ◽

Bonding Zone ◽

Plasma Sprayed

The low bonding strength between plasma sprayed hydroxyapatite (HA) coatings and substrates is one of the problems, which should be solved. In this paper, the as-sprayed HA coatings were retreated by laser remelting. The microstructure and element analysis in coatings were studied by electron probe microanalyzer (EPMA) and the accessory of energy spectrum analyzer. The results show that the bonding state can be improved greatly after laser remelting and it is a metallurgical combination between transition layers and substrates. Generally, with the increase of laser power and the decrease of scanning speed, the bonding state between the surface and transition layer will be improved much more, but the value of Ca / P ratio will deviate much more from 1.67. In this experiment, the optimum technological parameter is that the laser power is 600 W and the scanning speed is 11.2 mm/s.

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Laser remelting of plasma-sprayed conventional and nanostructured Al2O3–13wt.%TiO2 coatings on titanium alloy

Journal of Alloys and Compounds ◽

10.1016/j.jallcom.2010.06.207 ◽

2010 ◽

Vol 506 (1) ◽

pp. 356-363 ◽

Cited By ~ 35

Author(s):

Chonggui Li ◽

You Wang ◽

Lixin Guo ◽

Junqi He ◽

Zhaoyi Pan ◽

...

Keyword(s):

Titanium Alloy ◽

Laser Remelting ◽

Tio2 Coatings ◽

Plasma Sprayed

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Grain growth characteristics of plasma-sprayed nanostructured Al2O3-13wt.%TiO2 coatings during laser remelting

Ceramics International ◽

10.1016/j.ceramint.2021.02.062 ◽

2021 ◽

Author(s):

Lifeng Xu ◽

Dongsheng Wang

Keyword(s):

Grain Growth ◽

Growth Characteristics ◽

Laser Remelting ◽

Tio2 Coatings ◽

Plasma Sprayed

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Laser remelting of plasma sprayed coatings

International Congress on Applications of Lasers & Electro-Optics ◽

10.2351/1.5059132 ◽

1998 ◽

Author(s):

K. L. Wang ◽

William M. Steen ◽

Y. M. Zhu

Keyword(s):

Laser Remelting ◽

Plasma Sprayed Coatings ◽

Plasma Sprayed ◽

Sprayed Coatings

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Laser surface remelting of plasma sprayed nanostructured Al2O3–13wt%TiO2 coatings on titanium alloy

Applied Surface Science ◽

10.1016/j.apsusc.2009.06.033 ◽

2009 ◽

Vol 255 (20) ◽

pp. 8603-8610 ◽

Cited By ~ 51

Author(s):

Y. Wang ◽

C.G. Li ◽

W. Tian ◽

Y. Yang

Keyword(s):

Titanium Alloy ◽

Laser Surface ◽

Laser Surface Remelting ◽

Tio2 Coatings ◽

Plasma Sprayed

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Effects of Laser Remelting at Cryogenic Conditions on Microstructure and Wear Resistance of the Ti6Al4V Alloy Applied in Medicine

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.183.215 ◽

2011 ◽

Vol 183 ◽

pp. 215-224 ◽

Cited By ~ 1

Author(s):

A. Zieliński ◽

M. Jażdżewska ◽

J. Łubiński ◽

Waldemar Serbiński

Keyword(s):

Surface Treatment ◽

Laser Treatment ◽

Laser Power ◽

Ti6al4v Alloy ◽

Laser Remelting ◽

Linear Rate ◽

Surface Cracking ◽

Continuous Work ◽

Cryogenic Conditions ◽

Made In

The titanium and its alloys can be subjected to surface treatment, including laser treatment. In this work a new laser treatment at cryogenic conditions of Ti6Al4V alloy has been described. The work has been aimed at establishing whether such surface treatment could be suitable for implants working under wear in biological corrosive environment. The remelting has been made with the use of CO2 continuous work laser at laser power between 3 and 6 kW, at scan rate 0.5 and 1 m/s. The microstructure, surface topography, hardness, microhardness and wear linear rate and mass loss under tribological tests made in Ringer`s solution have been made. The results have shown that despite the surface cracking the tribological properties in simulated body fluid have been substantially improved.

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