Effects of different binders on microstructure and phase composition of hydroxyapatite Nd–YAG laser clad coatings

Chien, Chi-Sheng; Hong, T.; Han, Tengfei; Kuo, Tsung-Yuan; Liao, Tze Yuan

doi:10.1016/j.apsusc.2010.09.108

Cited by 24 publications

(5 citation statements)

References 20 publications

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“…Many studies have shown that laser cladding enhances the bonding strength between bioceramic materials such as HA and FA and metallic substrates and hence inhibits the disintegration and detachment of the coating layer [21][22][23][24][25]. In a previous study [22], the present group investigated the effects of TiO 2 addition on the surface microstructure and bioactivity of FA coatings deposited on Ti6Al4V substrates using an Nd:YAG laser.…”

Section: Introductionmentioning

confidence: 93%

Bioactivity of fluorapatite/alumina composite coatings deposited on Ti6Al4V substrates by laser cladding

et al. 2016

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Hydroxyapatite (HA) is one of the most commonly used coating materials for metal implants. However, following high-temperature deposition, HA easily decomposes into an unstable phase or forms an amorphous phase, and hence, the long-term stability of the implant is reduced. Accordingly, the present study investigates the use of fluorapatite (FA) fortified with 20 wt% alumina (a-Al 2 O 3 ) as an alternative biomedical coating material. The coatings are deposited on Ti6Al4V substrates using a Nd:YAG laser cladding process performed with laser powers and travel speeds of 400 W/200 mm/min, 800 W/400 mm/min and 1200 W/600 mm/min, respectively. The results show that for all of the specimens, a strong metallurgical bond is formed at the interface between the coating layer and the transition layer due to melting and diffusion. The XRD analysis results reveal that the cladding layers in all of the specimens consist mainly of FA, b-TCP, CaF 2 , Ti and h-Al 2 O 3 phases. In addition, the cladding layers of the specimens prepared using laser powers of 400 and 800 W also contain CaTiO 3 and CaAl 2 O 4 , while that of the specimen clad using a power of 1200 W contains TTCP and CaO. Following immersion in simulated body fluid for 14 days, all of the specimens precipitate dense bone-like apatite and exhibit excellent bioactivity. However, among all of the specimens, the specimen that is prepared with a laser power of 800 W shows the best biological activity due to the presence of residual FA, apatite-generating CaTiO 3 and a rough cladding layer surface.

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Section: Introductionmentioning

confidence: 93%

Bioactivity of fluorapatite/alumina composite coatings deposited on Ti6Al4V substrates by laser cladding

et al. 2016

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“…Laser beam irradiation provides an intense source of high-coherence electromagnetic radiation and can produce a strong metallurgical bonded substrate-coating interface when used for cladding [5,29,30].…”

Section: Introductionmentioning

confidence: 99%

“…Many studies have examined the use of Ta or Ta 2 O 5 as bioactive coatings for metal implants [17,19,25,[28][29][30]. However, Ta is a metal, whereas Ta 2 O 5 is a ceramic, and the metallurgical properties of laserclad coatings vary signi cantly depending on the coating material.…”

Section: Introductionmentioning

confidence: 99%

Comparison of laser cladding properties of tantalum and tantalum pentoxide powders on titanium substrates

Li,

Hsieh,

Lin

et al. 2024

Preprint

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Tantalum (Ta) has excellent mechanical properties, biocompatibility, and corrosion resistance. However, its application is limited by its high cost. Tantalum pentoxide (Ta2O5), a stable oxide of Ta, is a key role of Ta surface with excellent biological properties and corrosion resistance and has the advantage of a lower cost. In this study, Ta and Ta2O5 powders were preplaced on titanium (Ti) substrates and irradiated by a diode laser to form single-layer single-pass coatings. For comparison purposes, the scanning process was performed using a range of laser powers (1000, 1500, and 2000 W) and scanning speeds (3–5, 4.5–7.5, and 6–10 mm/s). The Ta coatings showed no surface cracking. However, spherical pores were observed near the fusion line of the coating with the substrate in some samples. The porosity increases with the decrease of laser powers and the scanning speeds. The formation of these pores was attributed mainly to the evaporation of the Ti substrate during the cladding process and the subsequent entrapment of the vapor bubbles within the coating. The Ta2O5 coatings showed almost no pores but exhibited few transverse cracks on the coating surface as a result of the thermal expansion coefficient mismatch between the ceramic coating and metallic substrate. For all of the coatings, the coating hardness was significantly higher than that of the substrate. The Ta2O5 coatings (580–700 HV) showed a higher hardness than the Ta coatings (350–400 HV). Moreover, the coating hardness remained approximately constant through the coating depth, whereas that of the Ta coatings showed a notable reduction with an increasing distance from the coating surface.

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“…Some researchers have carried out relevant work on laser-cladding processes in the biomedical field. The typical hydroxyapatite (HA) coatings were fabricated on Ti alloy substrate by laser cladding [ 18 , 19 ]. Liu et al and Zheng et al fabricated the calcium phosphate coatings with bioactivity on Ti6Al4V [ 20 , 21 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of CeO2 on Microstructure and Wear Resistance of TiC Bioinert Coatings on Ti6Al4V Alloy by Laser Cladding

Chen

Liu

et al. 2017

Materials

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To solve the lack of wear resistance of titanium alloys for use in biological applications, various prepared coatings on titanium alloys are often used as wear-resistant materials. In this paper, TiC bioinert coatings were fabricated on Ti6Al4V by laser cladding using mixed TiC and ZrO2 powders as the basic pre-placed materials. A certain amount of CeO2 powder was also added to the pre-placed powders to further improve the properties of the TiC coatings. The effects of CeO2 additive on the phase constituents, microstructures and wear resistance of the TiC coatings were researched in detail. Although the effect of CeO2 on the phase constituents of the coatings was slight, it had a significant effect on the microstructure and wear resistance of the coatings. The crystalline grains in the TiC coatings, observed by a scanning electron microscope (SEM), were refined due to the effect of the CeO2. With the increase of CeO2 additive content in the pre-placed powders, finer and more compact dendrites led to improvement of the micro-hardness and wear resistance of the TiC coatings. Also, 5 wt % content of CeO2 additive in the pre-placed powders was the best choice for improving the wear properties of the TiC coatings.

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Effects of different binders on microstructure and phase composition of hydroxyapatite Nd–YAG laser clad coatings

Cited by 24 publications

References 20 publications

Bioactivity of fluorapatite/alumina composite coatings deposited on Ti6Al4V substrates by laser cladding

Bioactivity of fluorapatite/alumina composite coatings deposited on Ti6Al4V substrates by laser cladding

Comparison of laser cladding properties of tantalum and tantalum pentoxide powders on titanium substrates

Effect of CeO2 on Microstructure and Wear Resistance of TiC Bioinert Coatings on Ti6Al4V Alloy by Laser Cladding

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