1887

n South African Journal of Industrial Engineering - Laser coating of zirconium and ZrO composites on TiAlV for biomedical applications

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Abstract

Coating is a technology for improving the surface properties of components. Laser coating produces uniform composition with thickened layers that display a good metallurgical bond to the base material. These coatings are dense and crack-free, and have non-porous microstructures. The advantages of the process are that the components' surface will have high resistance to wear and corrosion, even at elevated temperatures. In this work, TiAlV base material was coated with zirconium and zirconia composite material to improve the base material's resistance to corrosion and wear. Zirconium powder mixed with binder (PVA and cold glue) was melted to produce a thin layer, which was then bonded to the TiAlV by irradiation with a fibre laser, thus forming a zirconium + zirconia composite due to an in-situ reaction in the liquid state. The presence of binder in the Zr powder indicated a change in the microstructural behaviour, as the results showed a gradual increase in the hardness of the coated TiAlV from top to bottom. It was also found that Zr + PVA binder coating was uniformly deposited, and had a less dendritic structure compared with Zr without binder or Zr with cold glue.

Oppervlakbedekking is 'n tegnologie wat die oppervlak-eienskappe van komponente verbeter. Laseroppervlakbedekking verskaf 'n uniforme samestelling van dik lae met goeie metallurgiese hegting aan die basis materiaal. Hierdie bedekkings is dig en kraakvry en het nie-poreuse mikrostrukture. Die voordele van die proses is dat die komponent se oppervlak 'n hoë weerstand teen slytasie en korrosie het, selfs by hoë temperature. TiAlV basis materiaal word in dié studie bedek met Zr en ZrO2 samestellings om die komponent se weerstand teen korrosie en slytasie te verbeter. Zr-poeier wat gemeng is met 'n verbinder (PVA en koue lym) is gesmelt om 'n dun lagie te vorm. Die lagie is gebind aan die TiAlV component deur bestraling met 'n vesellaser. Die teenwoordigheid van die verbinder in die Zr-poeier het gelei tot 'n verandering in die mikrostruktuur, die resultate toon 'n geleidelike toename in die hardheid van die bedekte TiAlV van bo na onder. Daar is ook gevind dat die bedekking met die Zr saam met die PVA verbinder uniform gedeponeer is en 'n minder dendritiese struktuur gehad het as die Zr sonder binder of die Zr met die koue lym.

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/content/indeng/25/1/EJC154315
2014-05-01
2016-12-06
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