The bonding of plasma-sprayed hydroxyapatite coatings to titanium: effect of processing, porosity and residual stress

Yang, Yicheng; Chang, Edward F.

doi:10.1016/s0040-6090(03)00810-1

Cited by 68 publications

(39 citation statements)

References 30 publications

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“…To evaluate the crystallinity, we adopted a commonly used index of crystallinity (IOC) defined from the ratio of three strongest HA peaks ((211), (112), and (300)) intensity of the HACs (Ic) and the as-received HA powder (I p) according to the relationship IOC ¼ ðIc=I pÞ Â 100%. 5,13) This method assumes that the IOC of as-received powder is 100%. For observation of the cross-sectional microstructure, samples were carefully ground and polished to avoid inducing extra pores and cracks.…”

Section: Microstructure Observationmentioning

confidence: 99%

Effect of Crystallization on the Bonding Strength and Failures of Plasma-Sprayed Hydroxyapatite

Yang

Lui

2007

Mater. Trans.

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Hydroxyapatite coatings were synthesized on Ti-6Al-4V substrates using the plasma spraying process followed by vacuum and atmospheric post-heat treatments at various elevated temperatures. This study provides an evaluation of the bonding strength and crystallization rate of HACs resulting from the variations in crystallinity and thermal induced cracking. Experimental results provide evidence that the atmospheric heat-treated HACs possessed higher crystallization rate than the vacuum-heated specimens. It implies that the presence of an atmosphere with moisture plays an important role in improving the crystallization of HACs. The bonding strength of all samples was improved with increasing HA crystallization, and the optimal heating condition was found to be about 600 C. However, the crystallization-induced defects result in a serious microstructure and bonding strength degradation when the heating temperatures were higher than 600 C for both post-heat methods. On the basis of the fracture morphologies observation and the bonding strength data fluctuation of both heating conditions, the Weibull distribution function provides a powerful statistical analysis for assessing the failure mechanism and the reliability of plasma-sprayed and post heat-treated HACs.

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Section: Microstructure Observationmentioning

confidence: 99%

Effect of Crystallization on the Bonding Strength and Failures of Plasma-Sprayed Hydroxyapatite

Yang

Lui

2007

Mater. Trans.

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“…In contrast, the residual stress and pretreated surface roughness of the substrate greatly affect the adhesive strength. 27,28) From the fractographs and the failure mode as shown in Fig. 8, the area fraction of adhesive failure (ad) tend to decrease with increasing temperature as demonstrated in Table 2 and Fig.…”

Section: Variation Of Bonding Strength By Hydrothermal Treatmentmentioning

confidence: 93%

“…The variation of bonding strength in situ was suggested to be governed by (1) the microstructural feature, (2) interface reaction between coating and metal substrate and (3) residual stress of the coating. [24][25][26][27] However, statistically detailed examination is still needed. 27) From Fig.…”

Section: Ht200 -mentioning

confidence: 99%

“…[24][25][26][27] However, statistically detailed examination is still needed. 27) From Fig. 3, impurity phases such as TCP and TP can be reduced by hydrothermal treatment, though a few amount of retained CaO phase still can be recognized except for HT200, resulting from the slower reaction rate of CaO phase transformation into HA, compared with the hydrolytic process of Ca 3 (PO 4 ) 2 and Ca 4 P 2 O 9 .…”

Section: Ht200 -mentioning

confidence: 99%

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Effect of Hydrothermal Treatment on Microstructural Feature and Bonding Strength of Plasma-Sprayed Hydroxyapatite on Ti-6Al-4V

et al. 2004

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The effects of hydrothermal treating temperature on bonding strength pertaining to the microstructural evolution of plasma-sprayed hydroxyapatite coatings (HACs) on Ti-6Al-4V substrate were investigated. On the basis of the observed microstructure, the as-sprayed amorphous and impurity phases, such as -Ca 3 (PO 4 ) 2 , Ca 4 P 2 O 9 and CaO transform into crystalline HA after performing the hydrothermal treatment. Additionally, ultrafine crystallized particles can be recognized that the nucleation and grain growth occur by hydrothermal treatment at elevated temperatures of 175 C and 200 C. Furthermore, the hydrothermal treatment between 100 C and 150 C shows a significant decrease in microcracks, corresponding to an increase in bonding strength. This study reveals that even a small variation of hydrothermal heating temperature under 200 C can cause significant changes of the microstructural morphologies. Combining the experimental results of spraying defects, microstructural evolution and bonding strength, the knowledge of the hydrothermal-treated HACs will be helpful for the understanding and prediction in the biological stability and mechanical stability of HACs in the long-term clinical use.

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“…The bond strength values of the HVOF sprayed nanostructured titania coating and various HA thermal spray coatings found in the literature (Ref [14][15][16][17][18][19] are listed in Table 2. The mechanical strength of the nanostructured titania coating is higher than the mechanical strength of the epoxy glue used during the bond strength test of the ASTM standard C 633-01.…”

Section: Hardness and Bond Strengthmentioning

confidence: 99%

Biocompatible Nanostructured High-Velocity Oxyfuel Sprayed Titania Coating: Deposition, Characterization, and Mechanical Properties

Lima

Marple

et al. 2006

Journal of Thermal Spray Technology

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The bonding of plasma-sprayed hydroxyapatite coatings to titanium: effect of processing, porosity and residual stress

Cited by 68 publications

References 30 publications

Effect of Crystallization on the Bonding Strength and Failures of Plasma-Sprayed Hydroxyapatite

Effect of Crystallization on the Bonding Strength and Failures of Plasma-Sprayed Hydroxyapatite

Effect of Hydrothermal Treatment on Microstructural Feature and Bonding Strength of Plasma-Sprayed Hydroxyapatite on Ti-6Al-4V

Biocompatible Nanostructured High-Velocity Oxyfuel Sprayed Titania Coating: Deposition, Characterization, and Mechanical Properties

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