The aim of this work is to assess the influence of two blast media on the deposition of hydroxyapatite onto a titanium substrate using a novel ambient temperature coating technique named CoBlast. CoBlast was developed to address the problems with high temperature coating techniques. The blasting media used in this study were Al2O3 and a sintered apatite powder. The prepared and coated surfaces were compared to plasma sprayed hydroxyapatite on the same substrates using the same hydroxyapatite feedstock powder. X-ray diffraction analysis revealed the coating crystallinity was the same as the original hydroxyapatite feedstock powder for the CoBlast samples while evidence of amorphous hydroxyapatite phases and β-TCP was observed in the plasma sprayed samples. The blast media type significantly influences the adhesive strength of the coating, surface roughness of both the substrate and coating and the microstructure of the substrate. The coating adhesion increased for the CoBlasted samples from 50 MPa to 60 MPa for sintered apatite powder and alumina, respectively, while plasma spray samples were significantly lower (5 MPa) when tested using a modified pull-test. In conclusion, the choice of blast medium is shown to be a key parameter in the CoBlast process. This study indicates that sintered apatite powder is the most suitable candidate for use as a blast medium in the coating of medical devices.
DixonTShawMEbrahimS. Trends in hip and knee joint replacement: socioeconomic inequalities and projections of need. Ann Rheum Dis2004; 63(7): 825–830.
2.
InghamEFisherJ. The role of macrophages in osteolysis of total joint replacement. Biomaterials2005; 26(11): 1271–1286.
3.
Le GuéhennecLSoueidanALayrolleP. Surface treatments of titanium dental implants for rapid osseointegration. Dental Mater2007; 23(7): 844–854.
4.
KusakabeHSakamakiTNiheiK. Osseointegration of a hydroxyapatite-coated multilayered mesh stem. Biomaterials2004; 25(15): 2957–2969.
5.
FreemanCOBrookIMJohnsonA. Crystallization modifies osteoconductivity in an apatite–mullite glass–ceramic. J Mater Sci Mater Med2003; 14(11): 985–990.
6.
HavertyDTofailSAMStantonKT. Structure and stability of hydroxyapatite: Density functional calculation and Rietveld analysis. Phys Rev B2005; 71(9): 094103–094103.
7.
TofailSAMHavertyDStantonKT. Structural order and dielectric behaviour of hydroxyapatite. Ferroelectrics2005; 319(1): 117–123.
8.
HenchLL. Bioceramics: from concept to clinic. J Am Ceramic Soc1991; 74(7): 1487–1510.
9.
TsuiYCDoyleCClyneTW. Plasma sprayed hydroxyapatite coatings on titanium substrates Part 1: Mechanical properties and residual stress levels. Biomaterials1998; 19(22): 2015–2029.
10.
LiHKhorKACheangP. Titanium dioxide reinforced hydroxyapatite coatings deposited by high velocity oxy‐fuel (HVOF) spray. Biomaterials2002; 23(1): 85–91.
11.
ZhitomirskyIGal-OrL. Electrophoretic deposition of hydroxyapatite. J Mater Sci: Mater Med1997; 8(4): 213–219.
12.
O’FlynnKStantonK. Optimisation of the enamelling of an apatite–mullite glass–ceramic coating on Ti6Al4V. J Mater Sci: Mater Med2011; 22(9): 2035–2044.
13.
PrevyP. X-ray diffraction characterization of crystallinity and phase composition in plasma-sprayed hydroxyapatite coatings. J Thermal Spray Technol2000; 9(3): 369–376.
14.
FazanFMarquisPM. Dissolution behavior of plasma-sprayed hydroxyapatite coatings. J Mater Sci: Mater Med2000; 11(12): 787–792.
15.
SobieszczykSZielińskiA. Coatings in arthroplasty: review paper. Adv Mater Sci2008; 8(4): 35–54.
16.
CookSDThomasKAKayJF. Experimental coating defects in hydroxylapatite-coated implants. Clin Orthopaed Related Res1991; 265: 280–280.
17.
CollierJPSurprenantVAMayorMB. Loss of hydroxyapatite coating on retrieved, total hip components. J Arthroplasty1993; 8(4): 389–393.
18.
O'NeillLO'SullivanCO'HareP. Deposition of substituted apatites onto titanium surfaces using a novel blasting process. Surf Coat Technol2009; 204(4): 484–488.
19.
O'SullivanCO'HarePO'LearyND. Deposition of substituted apatites with anticolonizing properties onto titanium surfaces using a novel blasting process. J Biomed Mater Res Part B: Appl Biomater2010; 95(1): 141–149.
20.
O'HarePMeenanBJBurkeGA. Biological responses to hydroxyapatite surfaces deposited via a co-incident microblasting technique. Biomater2010; 31(3): 515–522.
21.
SchuhABigoneyJHönleW. Second generation (low modulus) titanium alloys in total hip arthroplasty. Materialwissenschaft und Werkstofftechnik2007; 38(12): 1003–1007.
JiangXPWangXYLiJX. Enhancement of fatigue and corrosion properties of pure Ti by sandblasting. Mater Sci Eng A2006; 429(1–2): 30–35.
24.
TeohSH. Fatigue of biomaterials: a review. Int J Fatigue2000; 22(10): 825–837.
25.
ParkJWKimYJParkCH. Enhanced osteoblast response to an equal channel angular pressing-processed pure titanium substrate with microrough surface topography. Acta Biomaterialia2009; 5(8): 3272–3280.
26.
KollerGCookRJThompsonID. Surface modification of titanium implants using bioactive glasses with air abrasion technologies. J Mater Sci: Mater Med2007; 18(12): 2291–2296.
27.
de FaoiteDBrowneDJChang-DiazFRStantonKT. A review of the processing composition and temperature-dependent mechanical and thermal properties of dielectric technical ceramics. J Mater Sci2012; 47(10): 4211–4234.
28.
BohlerMKanzFSchwarzB. Adverse tissue reactions to wear particles from Co-alloy articulations, increased by alumina-blasting particle contamination from cementless Ti-based total hip implants: a report of seven revisions with early failure. J Bone Joint Surg-British Vol2002; 84(1): 128–128.
29.
O'SullivanCO'HarePByrneG. A modified surface on titanium deposited by a blasting process. Coatings2011; 1(1): 53–71.
30.
HasegawaMDoiYUchidaA. Cell-mediated bioresorption of sintered carbonate apatite in rabbits. J Bone Joint Surg British Vol2003; 85–B(1): 142–147.
31.
Gammon LM, Briggs RD, Packard JM, et al. Metallography and microstructures of titanium and its alloys 2004, ASM International, Member/Customer Service Center, Materials Park, OH, 44073–0002, USA.
32.
ASTM. Standard test method for tension testing of calcium phosphate and metallic coatings, ASTM International: West Conshohocken, PA, 2011.
33.
ÇelikEDemirkıranAŞAvcıE. Effect of grit blasting of substrate on the corrosion behaviour of plasma-sprayed Al2O3 coatings. Surf Coat Technol1999; 116–119: 1061–1064.
34.
EpinetteJAManleyMT. Fifteen years of clinical experience with hydroxyapatite coating in joint arthroplasty, Springer: France, 2004.
35.
ThomasMLindleyTJacksonM. The microstructural response of a peened near-α titanium alloy to thermal exposure. Scripta Materialia2009; 60(2): 108–111.
36.
ChristianJWMahajanS. Deformation twinning. Progr Mater Sci1995; 39(1–2): 1–157.
37.
GariboldiEPrevitaliB. High tolerance plasma arc cutting of commercially pure titanium. J Mater Process Technol2005; 160(1): 77–89.
38.
TsuiYCDoyleCClyneTW. Plasma sprayed hydroxyapatite coatings on titanium substrates Part 2: optimisation of coating properties. Biomater1998; 19(22): 2031–2044.
39.
WiskottHWADoumasTScherrerSS. Microstructures of brazings and welds using grade 2 commercially pure titanium. Int J Prosthedontics2001; 14(1)
40.
NouriAHodgsonPDWenCE. Effect of process control agent on the porous structure and mechanical properties of a biomedical Ti–Sn–Nb alloy produced by powder metallurgy. Acta Biomaterialia2010; 6(4): 1630–1639.
