Crack Propagation Resistance of α-Al2O3 Reinforced Pulsed Laser-Deposited Hydroxyapatite Coating on 316 Stainless Steel

Bajpai, Shubhra; Gupta, Ankur; Pradhan, S. K.; Mandal, Tapendu; Balani, Kantesh

doi:10.1007/s11837-014-1152-3

Cited by 21 publications

(8 citation statements)

References 62 publications

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“…For each sample, ten indentations were made using a maximum load of 30 mN with each indentation separated by 20 µm. Details about nano indentation test methodology can be found elsewhere [37]. Fig.…”

Section: Mechanical Property Characterizationmentioning

confidence: 99%

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Effect of semi-solid forging on microstructure and mechanical properties of in-situ cast Al-Cu-TiB 2 composites

Mathew

Mandal

Kumar

et al. 2017

Journal of Alloys and Compounds

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Permanent WRAP URL:http://wrap.warwick.ac.uk/87711 Copyright and reuse:The Warwick Research Archive Portal (WRAP) makes this work by researchers of the University of Warwick available open access under the following conditions. Copyright © and all moral rights to the version of the paper presented here belong to the individual author(s) and/or other copyright owners. To the extent reasonable and practicable the material made available in WRAP has been checked for eligibility before being made available.Copies of full items can be used for personal research or study, educational, or not-for-profit purposes without prior permission or charge. Provided that the authors, title and full bibliographic details are credited, a hyperlink and/or URL is given for the original metadata page and the content is not changed in any way. This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPT Abstract:The present work deals with the effect of semisolid processing on microstructure and mechanical properties of Al-4.5 % Cu -5% TiB 2 in-situ cast composites. The composite was prepared by flux assisted synthesis in which TiB 2 particles were formed in-situ through an exothermic reaction between K 2 TiF 6 and KBF 4 halide salts. Al-4.5wt% Cu alloy and Al-4.5%Cu-5 % TiB 2 composite samples were forged in semisolid state with 0.3 volume fraction of liquid. Semisolid forging was carried out for two forge reductions (30% and 50% forge reductions). Microstructure studies show that the semi-solid forging results in uniform distribution of TiB 2 particles and Al 2 Cu particles in the composite. Further, TiB 2 particles play a dual role as grain refiners as well as reinforcements of composites. EBSD and nano indentation studies shows that semisolid forging results in dynamic recrystallization of grains in the composite with significant grain refinement which leads to a marked increase in hardness and elastic modulus of the alloy as well as the composite.

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Section: Mechanical Property Characterizationmentioning

confidence: 99%

“…The total displacement (h max ) is the displacement of the indenter from its initial position at peak load (P max ). However, the material elastically recovers its shape partially, when the indenter is unloaded [37][38][39][40]. So the total displacement is composed of both elastic and plastic displacements.…”

Section: Mechanical Property Characterizationmentioning

confidence: 99%

Effect of semi-solid forging on microstructure and mechanical properties of in-situ cast Al-Cu-TiB 2 composites

Mathew

Mandal

Kumar

et al. 2017

Journal of Alloys and Compounds

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“…Unfortunately, poor fracture toughness and wear resistance of monolithic HA limit its potential applications as a coating material, especially on load-bearing metallic implants [5,6]. To achieve improved mechanical properties of HA coating, HA composite coatings reinforced with a second phase, such as alumina (Al 2 O 3 ) [7,8], yttria-stabilized zirconia (YSZ) [9,10], and titania [11,12] have been considerably developed in the past two decades. Despite significant improvement achieved in fracture toughness of these HA composite coatings, it should be noted that the addition contents of these ceramic particles, basically biologically inert, are usually as high as 30-50% in weight fraction (wt.%), inevitably leading to degradation of the excellent bioactivity and osteointegration associated with HA.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Scratch Performance of Plasma Sprayed Hydroxyapatite Composite Coatings Reinforced with BN Nanoplatelets

et al. 2020

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In recent years, research on hydroxyapatite (HA) coatings has been driven by the demands of clinical applications. However, the intrinsic brittleness of HA limits its potential in the use for the load-bearing implant. To improve mechanical properties of the HA coating itself, a HA composite coating reinforced with hexagonal boron nitride nanoplatelets (BNNP) was fabricated using plasma spray, and its scratch behavior was investigated in this research. Typical brittle fractures such as microcracks both in and beyond the residual groove and material chipping were observed in the HA coating, while stronger and tougher BNNP/HA coatings exhibited a dominant role in protecting them from scratch damage through resisting plastic deformation and brittle microfracturing. Moreover, easier grain sliding within a splat and splat sliding at the splat boundaries due to the presence of BNNPs, and the nature porosity at different length scales of the as-sprayed HA composite coatings would provide significant self-lubricating effects to reduce the lateral force during scratching and alleviate the contact damage. Therefore, the addition of BNNPs renders HA coating with low scratch friction and enhanced tolerance to surface damage, which is naturally beneficial for the long-term durability and reliability of the implants.

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“…To further improve mechanical properties of HA coating itself, HA composite coatings with a second phase (usually ceramic particles such as Al2O3, ZrO2, and TiO2) have been extensively explored [7][8][9][10][11][12]. Despite significant improvement achieved in fracture toughness of these HA composite coatings, it is necessary to note that the addition contents of these ceramic particles, basically biologically inert, are usually as high as 30-50% weight fraction, inevitably leading to degradation of the excellent bioactivity associated with monolithic HA.…”

Section: ． Introductionmentioning

confidence: 99%

Heat and Hydrothermal Treatment on the Microstructure Evolution of Plasma Sprayed Hydroxyapatite Coatings Reinforced with Graphene Nanoplatelets

Ren¹,

Zhao²,

Qi³

et al. 2018

Preprint

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Recent advances and demands in clinical applications drive a large amount of research to hydroxyapatite (HA) composite coatings fabricated by plasma spray. However, lower degree of HA crystallinity related to high temperature exposure in plasma spray usually leads to rapid weakening and disintegration of HA coatings and often promotes inflammatory responses in the surrounding tissue. In this research, graphene nanosheet (GNS) reinforced HA coatings were fabricated using plasma spray and followed by heat and hydrothermal treatment (hereafter referred to as thermal treatment). The addition of GNSs resulted in competing phenomenon to influence HA crystallinity viz. increased portion of the partially melted/unmelted zones and higher cooling rate during splat formation, leading to slight increase in HA crystallinity (~46.0-51.3%) in the as-sprayed coating. XRD and FTIR results showed that thermal treatment was capable of inducing significant transformation of amorphous HA to the crystalline form and removing other foreign non-HA compounds through regaining OH- ion, and therefore HA coatings displayed ~45.5-47.1% improvements in HA crystallinity regardless of addition or not of the GNS nanofillers. Microstructure observations revealed that thermal treatment enabled microcrack propagation due to stresses caused by crystallisation and phase transformations, and the residual partially melted/unmelted zone of the thermally treated GNS/HA coating was significantly decreased in size. More importantly, the added GNSs contributed greatly to the significant increase in surface nanoroughness of the thermally treated HA coatings owing to the fact that much more structural defects along with the GNSs mainly induced by thermal treatment might act as nucleation sites to accelerate HA nanoparticle precipitation, which would be beneficial for the improved adhesion strength of the osteoblast cells on the coating surface.

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Crack Propagation Resistance of α-Al2O3 Reinforced Pulsed Laser-Deposited Hydroxyapatite Coating on 316 Stainless Steel

Cited by 21 publications

References 62 publications

Effect of semi-solid forging on microstructure and mechanical properties of in-situ cast Al-Cu-TiB 2 composites

Effect of semi-solid forging on microstructure and mechanical properties of in-situ cast Al-Cu-TiB 2 composites

Enhanced Scratch Performance of Plasma Sprayed Hydroxyapatite Composite Coatings Reinforced with BN Nanoplatelets

Heat and Hydrothermal Treatment on the Microstructure Evolution of Plasma Sprayed Hydroxyapatite Coatings Reinforced with Graphene Nanoplatelets

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