Nanostructured diamond coatings for orthopaedic applications

Catledge, Shane A.; Thomas, Vinoy; Vohra, Yogesh K.

doi:10.1533/9780857093516.2.105

Cited by 26 publications

(27 citation statements)

References 157 publications

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“…5 We have carried out an extensive study on the growth and characterization of NCD micro-anvils. A total of ten-anvils were fabricated to confirm the reproducibility of the growth process.…”

Section: Resultsmentioning

confidence: 99%

“…2 It is also well established from extensive literature on NCD coatings on metals that NCD thin-film material has higher fracture toughness and improved mechanical properties compared to their micro-crystalline diamond counterparts. 5 We report in this letter on the successful synthesis of a NCD micro-anvil on top of a single crystalline diamond by combining mask-less lithography with a Author to whom correspondence should be addressed. Electronic mail: ykvohra@uab.edu microwave plasma CVD and demonstrate the application of CVD grown micro-anvils in ultra-high pressure studies on materials.…”

Section: Introductionmentioning

confidence: 99%

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Nanocrystalline diamond micro-anvil grown on single crystal diamond as a generator of ultra-high pressures

et al. 2016

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By combining mask-less lithography and chemical vapor deposition (CVD) techniques, a novel two-stage diamond anvil has been fabricated. A nanocrystalline diamond (NCD) micro-anvil 30 μm in diameter was grown at the center of a [100]-oriented, diamond anvil by utilizing microwave plasma CVD method. The NCD micro-anvil has a diamond grain size of 115 nm and micro-focused Raman and X-ray Photoelectron spectroscopy analysis indicate sp3-bonded diamond content of 72%. These CVD grown NCD micro-anvils were tested in an opposed anvil configuration and the transition metals osmium and tungsten were compressed to high pressures of 264 GPa in a diamond anvil cell.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Nanocrystalline diamond micro-anvil grown on single crystal diamond as a generator of ultra-high pressures

et al. 2016

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“…These surfaces were then processed using a microwave plasma Chemical Vapor Deposition (CVD) system to deposit a 3–5 μm layer of NSD[15]. The NSD coatings are not phase-pure diamond, but consist of nanocrystalline diamond grains (10–100 nm) along with amorphous carbon to yield a measured hardness of 60–70 GPa [16].…”

Section: Methodsmentioning

confidence: 99%

A wear simulation study of nanostructured CVD diamond-on-diamond articulation involving concave/convex mating surfaces

2015

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Using microwave-plasma Chemical Vapor Deposition (CVD), a 3-micron thick nanostructured-diamond (NSD) layer was deposited onto polished, convex and concave components that were machined from Ti-6Al-4V alloy. These components had the same radius of curvature, 25.4mm. Wear testing of the surfaces was performed by rotating articulation of the diamond-deposited surfaces (diamond-on-diamond) with a load of 225N for a total of 5 million cycles in bovine serum resulting in polishing of the diamond surface and formation of very shallow, linear wear grooves of less than 50nm depth. The two diamond surfaces remained adhered to the components and polished each other to an average surface roughness that was reduced by as much as a factor of 80 for the most polished region located at the center of the condyle. Imaging of the surfaces showed that the initial wearing-in phase of diamond was only beginning at the end of the 5 million cycles. Atomic force microscopy, scanning electron microscopy, Raman spectroscopy, and surface profilometry were used to characterize the surfaces and verify that the diamond remained intact and uniform over the surface, thereby protecting the underlying metal. These wear simulation results show that diamond deposition on Ti alloy has potential application for joint replacement devices with improved longevity over existing devices made of cobalt chrome and ultra-high molecular weight polyethylene (UHMWPE).

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“…butoxide 0.01% mol per 500 g lactic acid to PLA powders (Molecular weight = 100,000-150,000 and viscosity = 2.17 ± 0.059 cP) [6,8,9].…”

Section: Preparation Of Poly-l-lactic Acid (Pla)mentioning

confidence: 99%

“…Then, soaked the bones in oxidizing solution for 72 h and calcined at 950 °C for 12 h [8]. Finally, milling and sieving to be powders [6].…”

Section: Preparation Of Hydroxyapatite (Ha)mentioning

confidence: 99%

Effect of forming conditions of poly-lactic acid/hydroxyapatite to tensile strength of canine bone fixation plate using full factorial experimental design

et al. 2018

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Abstract. Problems of using metallic bone fixation plates for canine lead to the idea of the replacement with biocomposite materials. In this research, polylactic acid (PLA) blends with hydroxyapatite (HA) powder 5-15% was used as biocomposite material. The specimens were formed by hot compression molding and the experiment in investigating suitable forming condition was based on the 2 3 full factorials with the center point design of experiment. There are many types of research attempting to develop a prototype of bone fixation plates from a substitute material including forming conditions, in order to obtain the effective bone fixation plate to use. This paper presents the tensile strength for the proposed biocomposite bone fixation plates. After the mechanical testing on various conditions, the tensile strength results ranged from 40 to 60 MPa and it showed that the higher HA ratio had significant effect to the decrease of the tensile strength. This preliminary experiment reveals the tensile strength of forming conditions of PLA/HA composite, which may indicate a direction for improving the better mechanical properties of the bone fixation plates.

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Nanostructured diamond coatings for orthopaedic applications

Cited by 26 publications

References 157 publications

Nanocrystalline diamond micro-anvil grown on single crystal diamond as a generator of ultra-high pressures

Nanocrystalline diamond micro-anvil grown on single crystal diamond as a generator of ultra-high pressures

A wear simulation study of nanostructured CVD diamond-on-diamond articulation involving concave/convex mating surfaces

Effect of forming conditions of poly-lactic acid/hydroxyapatite to tensile strength of canine bone fixation plate using full factorial experimental design

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