Deposition of substituted apatites onto titanium surfaces using a novel blasting process

O’Neill, Liam; O’Sullivan, Caroline; O’Hare, Peter; Sexton, Leo; Keady, F.; O’Donoghue, John

doi:10.1016/j.surfcoat.2009.08.014

Cited by 39 publications

(63 citation statements)

References 28 publications

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“…As shown in Figure 9 To further probe the surfaces, trenches were milled into the coatings using the FIB technique followed by SEM examination. As shown in Figure 10, both the CoBlast and Shot Peen samples were found to deposit a HA layer on the alloy surface to a depth of less than 10 µm, which is in agreement with previous CoBlast studies [11,13]. There is a marked contrast however between the structures of the two treated surfaces, with the CoBlast surface clearly showing folding of the HA into the distorted metal surface, to form an intricate mechanochemical surface structure in which both layers are blended together.…”

Section: Coating Chemistry and Topographysupporting

confidence: 88%

“…While the CoBlast process has been reported to operate at gauge pressures of 90 psig (0.62 MPa) and at a jet height of 20 mm from the surface [11,13,14]. The corresponding shot preening process typically runs at lower gauge pressures of 40 -60 psig (0.28-0.41 MPa) and at nozzle orifice to substrate heights of up to 200 mm [15,16].…”

Section: Resultsmentioning

confidence: 99%

“…All surface blasting was carried out using a Comco Standard Lathe as described previously [11,13,14]. The processing utilised twin nozzles, one for the HA stream and a separate nozzle for the abrasive/shot peen flow ( Figure 2).…”

Section: Sample Preparationmentioning

confidence: 99%

“…This technique which is called CoBlast TM has been shown to successfully deposit coatings which offer promising biological responses both in-vitro and in-vivo [11,13,14].…”

mentioning

confidence: 99%

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Comparison between shot peening and abrasive blasting processes as deposition methods for hydroxyapatite coatings onto a titanium alloy

Byrne

O’Neill

Twomey

et al. 2013

Surface and Coatings Technology

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HighlightsComparison of two low temperature deposition methods for HA Combining silica shot with a flow of HA powder worked effectively Replacing the silica with alumina abrasive produced a more adherent coating AbstractRecent studies have shown that combining a compressed air jet with entrained hydroxyapatite (HA) particles with a jet of abrasive particles can be used to deposit a well adhered crystalline HA coatings onto titanium substrates. A similar particle bombardment process utilising a flow of shot peen particles and a flow of suitable powder particles has been used to deposit a range of coatings, though the deposition of bioceramic powders have not yet been reported by this method. In this study a direct comparison between the shot peen and abrasive bombardment processes has been undertaken to determine which technique yields coatings exhibiting higher levels of adhesion on titanium alloy substrates. Both processes were shown to effectively deposit a layer of crystalline apatite onto the titanium substrates over a range of pressures and jet to substrate heights. It was observed that for both processes that an increase in particle kinetic energy producing corresponding enhancements in both deposition rate and surface roughness. The shot peen process however produced a smooth layer of laminar apatite, which was readily removed from the surface using a scratch adhesion test technique.In contrast the combination of a jet of HA and abrasive powders resulted in an increase in surface abrasion and increased mechanical interlocking of the HA into the metal surface was observed. The mechano-chemical affect achieved resulted in a better adhered HA layer. The surface morphology obtained using the two treatments was significantly different with an increase in the average roughness (R a ) of ≈ 70 and 80 % for samples treated with abrasive particles over shot peen. This difference in surface treatment is further highlighted by the removal of the HA using an acid etch. The roughness (R a ) of the underlying titanium layer after this removal is, on average, >175 % higher for the surface treated with the abrasive particles during HA deposition.

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Section: Coating Chemistry and Topographysupporting

confidence: 88%

Section: Resultsmentioning

confidence: 99%

Section: Sample Preparationmentioning

confidence: 99%

“…This technique which is called CoBlast TM has been shown to successfully deposit coatings which offer promising biological responses both in-vitro and in-vivo [11,13,14].…”

mentioning

confidence: 99%

See 2 more Smart Citations

Comparison between shot peening and abrasive blasting processes as deposition methods for hydroxyapatite coatings onto a titanium alloy

Byrne

O’Neill

Twomey

et al. 2013

Surface and Coatings Technology

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“…This paper investigates a new method, CoBlast TM , for depositing a PTFE coating onto superelastic NiTi wire. It is an ambient temperature process developed to address the problems associated with high temperature-coating techniques, such as the formation of unwanted phases, amorphization of the coating and poor adherence of the coating [5][6][7][8][9][10][11][12][13][14]. The coating produced with CoBlast is composed of separated particles firmly embedded within the substrate instead of the laminar structure typical of other coating techniques.…”

Section: Introductionmentioning

confidence: 99%

Blast Coating of Superelastic NiTi Wire with PTFE to Enhance Wear Properties

Dunne

Roche

Twomey

et al. 2015

Shap. Mem. Superelasticity

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This work investigates the deposition of polytetrafluoroethylene (PTFE) onto a superelastic NiTi wire using an ambient temperature-coating technique known as CoBlast. The process utilises a stream of abrasive (Al 2 O 3 ) and a coating medium (PTFE) sprayed simultaneously at the surface of the substrate. Superelastic NiTi wire is used in guidewire applications, and PTFE coatings are commonly applied to reduce damage to vessel walls during insertion and removal, and to aid in accurate positioning by minimising the force required to advance, retract or rotate the wire. The CoBlast coated wires were compared to wire treated with PTFE only. The coated samples were examined using variety of techniques: X-ray diffraction (XRD), microscopy, surface roughness, wear testing and flexural tests. The CoBlast coated samples had an adherent coating with a significant resistance to wear compared to the samples coated with PTFE only. The XRD revealed that the process gave rise to a stress-induced martensite phase in the NiTi which may enhance mechanical properties. The study indicates that the CoBlast process can be used to deposit thin adherent coatings of PTFE onto the surface of superelastic NiTi.

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Osteoconductivity and growth factor production by MG63 osteoblastic cells on bioglass‐coated orthopedic implants

Tan

Naciri

Al‐Rubeai

2010

Biotech & Bioengineering

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We have produced Bioglass coatings for Orthopedic implants by using a novel coating technique, CoBlast. The two resultant surfaces, designated BG and hydroxyapatite (HA)/BG, were compared with their HA counterpart, OsteoZip in terms of osteoblastic cell attachment, adhesion, proliferation, differentiation, and growth factor production. BG and HA/BG were demonstrated by goniometry to be more hydrophilic than OsteoZip. This corresponded to enhanced protein adsorption, cell attachment, and cell adhesion documented by both quantitative and qualitative assessments. BG and HA/BG surfaces had a significant initial release of Si and Ca ions, and this was consistent with elevated cell proliferation and basic fibroblast growth factor levels. However, OsteoZip, being similar to HA/BG, exhibited better osteogenic differentiation than BG did, shown by augmented differentiation marker activity at both protein and mRNA levels. Sandwich ELISA was used to quantify angiopoietin and inducible nitric oxide synthase which are involved in peri-prosthetic angiogenesis and aseptic loosening of total hip replacement, respectively. Both Bioglass-derived coatings provide superior initial osteoconductivity to OsteoZip, and HA/Bioglass composite coating outruns in long-term osteogenic differentiation and prognostic bioprocesses. The novel coatings discovered in this study have significant potential in providing both orthopedic and therapeutic functions.

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Deposition of substituted apatites onto titanium surfaces using a novel blasting process

Cited by 39 publications

References 28 publications

Comparison between shot peening and abrasive blasting processes as deposition methods for hydroxyapatite coatings onto a titanium alloy

Comparison between shot peening and abrasive blasting processes as deposition methods for hydroxyapatite coatings onto a titanium alloy

Blast Coating of Superelastic NiTi Wire with PTFE to Enhance Wear Properties

Osteoconductivity and growth factor production by MG63 osteoblastic cells on bioglass‐coated orthopedic implants

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