Calcium phosphate ceramic coatings on porous titanium: effect of structure and composition on electrophoretic deposition, vacuum sintering and in vitro dissolution

Ducheyne, Paul; Radin, S.; Heughebaert, M.; Heughebaert, J. C.

doi:10.1016/0142-9612(90)90005-b

Cited by 346 publications

(131 citation statements)

References 11 publications

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“…In contrast, thermal sprayed HA coating had many defects associated with the as-fabricated coatings, porosity, and cracks were evident, as well as the presence of amorphous phases. The interfacial and coating cracks are usually formed during cooling down of the fabricated components in the thermal spray process, due to large thermal expansion coefficient differences between the HA coating (aHA= 13 .5 X10" 6 /C) and the Ti substrate (0xTi= 9 .5 X10- 6 /C).…”

Section: Non-heat Treated Tis Ha Coating > Heat Treated T/s Ha Coatinmentioning

confidence: 99%

“…It has been demonstrated that nano ceramics have thermal expansion coefficients that nearly match the metal alloys due to the large volume fraction of atoms located at the grain boundary, which improves mobility [3,4]. To date, electrophoretic deposition ("EPD") of HA has been limited to conventional materials of micron grain size [5][6][7][8][9]. Mechanical properties of the micron HA are limited by relatively poor bend strength, fracture toughness, and compressive strength.…”

Section: Introductionmentioning

confidence: 99%

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Nanostructured Hydroxyapatite Coatings for Improved Adhesion and Corrosion Resistance for Medical Implants

et al. 2001

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Hydroxyapetite (HA) coating on medical implant has been used in commercial application for several decades. The coating, commercially made by thermal spray method, functions as a intermediate layer between human tissues and the metal implant. The coating can speed up early stage healing after operation but the life span is much limited by low interfacial bond strength, which comes from the dissolution of amorphous HA in human body fluid during its service. This amorphous phase is formed in coating process under high temperature. To overcome these problems, we have developed a novel room temperature electrophoretic deposition process to fabricate nanostructured HA coating. This nanostructured HA coating significantly improved coating's bond strength up to 50-60 MPa, 2-3 times better than the thermal sprayed HA coating. The nanostructured HA coating also has corrosion resistance 50-100 times higher than the conventional HA coating. X-ray diffraction shows that all the HA coating is fully crystalline phase. It is expected that the implants with the nanostructured HA coating will have much longer service life. Other benefits derived from this process include room temperature deposition, the ability to control the coating microstructure and phases, and low cost for production.

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Section: Non-heat Treated Tis Ha Coating > Heat Treated T/s Ha Coatinmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Nanostructured Hydroxyapatite Coatings for Improved Adhesion and Corrosion Resistance for Medical Implants

et al. 2001

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“…Dense and porous coating films of hydroxyapatite or related calcium phosphate for biomaterial have been also prepared by using the EPD process. [12][13][14][15] In addition, the EPD process was carried out as particle assembling technique for monodisperse microspheres of ceramics or polymer. A particle layer consisting of two or three dimensionally ordered microspheres can be prepared onto a flat substrate by the EPD method under the optimized conditions.…”

Section: -8mentioning

confidence: 99%

Macroporous Hydroxyapatite Ceramic Coating by Using Electrophoretic Deposition and Then Heat Treatment

Hamagami

Ato

Kanamura

2006

J. Ceram. Soc. Japan

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A macroporous hydroxyapatite ceramic coating was fabricated on a titanium substrate by an electrophoretic deposition EPD process followed by a heat treatment in order to obtain high performance bioactive porous hydroxyapatite. The key of this EPD process is a formation of composite particles by using a heterocoaguration reaction, consisting of hydroxyapatite ceramic nanoparticles for the ceramic frame material and monodisperse polystyrene polymer microspheres for template component, in a suspension. Microstructure of the porous ceramic coating layer depends on electrophoretic deposition parameters, and on heat treatment conditions. Under the optimized fabrication conditions, the hydroxyapatite ceramic coating layer with well-controlled macroporous structure was obtained. In vitro examination using a simulated body fluid revealed a good biocompatibility of the macroporous specimen.

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“…19 The dimples in the generated patterns are several tens of nanometers wide, six to ten nanometers deep, and arranged in highly ordered arrays. This is done by electropolishing a piece of metal (as large as several cm 2 ) in an optimized electrolyte at an optimized cell potential. 20 The a Author to whom correspondence should be addressed.…”

Section: Introductionmentioning

confidence: 99%

Ordered nano-scale dimple pattern formation on a titanium alloy (Ti-6Al-4V)

2012

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Due to the many applications of nanostructured surfaces – including in biomaterials – there is a strong interest in cost- and time-efficient methods for their fabrication. Previously, our group established a simple electrochemical method generating nanoscale patterns on large areas of a number of different metal surfaces. They consist of dimples that are around 6-10 nm deep and hexagonally closed packed with a tunable periodicity of around 50 nm. Ordering requires careful tuning of the surface chemistry, which makes the translation of these findings to multi-component alloys non-obvious. Here, we demonstrate for the first time that such a pattern can also be achieved on the surface of an alloy, namely Ti-6Al-4V. This alloy is of particular interest for biomedical implants. While dimple formation on the main component metals titanium and aluminum has previously been reported (albeit under conditions that differ from each other), we now also report dimple formation on pure vanadium surfaces to occur under very different conditions. Dimple formation occurs preferentially on the (dominant) α-phase grains of the alloy. The size of dimples of the alloy material is subject to the electropolishing potential, electrolyte concentration and surface chemical composition, which gives us the opportunity to control the surface features. Since a main application of this alloy are biomedical implants, this level of control will be an important tool for accommodating cell growth

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Calcium phosphate ceramic coatings on porous titanium: effect of structure and composition on electrophoretic deposition, vacuum sintering and in vitro dissolution

Cited by 346 publications

References 11 publications

Nanostructured Hydroxyapatite Coatings for Improved Adhesion and Corrosion Resistance for Medical Implants

Nanostructured Hydroxyapatite Coatings for Improved Adhesion and Corrosion Resistance for Medical Implants

Macroporous Hydroxyapatite Ceramic Coating by Using Electrophoretic Deposition and Then Heat Treatment

Ordered nano-scale dimple pattern formation on a titanium alloy (Ti-6Al-4V)

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