Thermal Conductivities of Nanostructured Magnesium Oxide Coatings Deposited on Magnesium Alloys by Plasma Electrolytic Oxidation

Shen, Xiaoyang; Nie, Xueyuan; Hu, Henry

doi:10.1166/jnn.2014.9447

Cited by 4 publications

(2 citation statements)

References 18 publications

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“…193 For corrosion resistance, improved wear performance and reduced thermal transport behavior on the surface, the formation of nanostructured oxidic coatings on Mg alloys using plasma electrolytic oxidation (PEO) has also been reported. 194 Also, polymer encapsulation via RF plasma polymerization has been critically discussed towards tailoring biodegradability and biocompatibility of magnesium. 195 Nanoparticles and nanotechnology continue to fuel the future of many fields including this one.…”

Section: Future Directionsmentioning

confidence: 99%

Biodegradable Materials for Clinical Applications: A Review

Paramsothy¹,

Ramakrishna²

2015

rev adv sci engng

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This review article focuses on mechanical properties and composition of degradable polymer, metal (magnesium), ceramic and composite materials with respect to clinical application involving cortical/cancellous bone, dentin and enamel, and ligament, tendon and fascia. On the basis of mechanical property comparison, each class of densified material may be used to substitute cortical bone, may not be used to substitute cancellous bone, may be used to substitute enamel and dentin, may be used to substitute lower limb ligaments and tendons, and may be used to substitute selected upper limb and trunk ligaments and associated tissues. For relatively longer times of recovery from more severe orthopedic trauma, PLLA (poly L-lactic acid) and TMC (trimethyl carbonate) polymers, selected Mg alloys containing zinc (Zn), calcium (Ca) and/or rare-earth (RE) elements, or hydroxyapatite (HA) and tricalcium phosphate (TCP) as crystalline bioceramics apparently are most suitable. Mg alloys or composites have significant potential for clinical application where the ability to bear appropriate load at least in the initial stages of recovery prior to significant resorption and load transfer to new tissue is critical. However, there is no clear opinion at present regarding the toxicity levels of many alloying elements in Mg alloys, particularly concerning RE elements. There is also the potential issue of nanoparticle cytotoxicity concerning alloy nanocomposite degradation invivo. Compared to crystalline bioceramics, the higher index of bioactivity (I B) of amorphous glasses and glass ceramics reflects their superior ability to form a dense interphase and bond strongly with bone, despite their mechanical inferiority. The combination of bioceramic and biodegradable polymer is synergistic based on direct improvement of mechanical property and degradation resistance of the polymer, indirect reduction of foreign body interactions, and direct increase in toughness of the ceramic. Future directions of this field regarding developments on cellulose as a biodegradable material, bone tissue regeneration and engineering, stronger and more corrosion resistant and biocompatible magnesium alloy systems, applicable nanoparticles and nanotechnology, and soft tissue engineering such as vascular tissue engineering are also addressed.

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Section: Future Directionsmentioning

confidence: 99%

Biodegradable Materials for Clinical Applications: A Review

Paramsothy¹,

Ramakrishna²

2015

rev adv sci engng

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“…To avoid the rapid degradation of magnesium in the human body, techniques of surface treatment can be applied to improve corrosion resistance and mitigate degradation. Recent studies [2][3][4][5][6][7][8] demonstrate that Plasma Electrolytic Oxidation (PEO) is a relatively cost-effective and environmentally friendly technique to improve the corrosion and wear resistance of magnesium and its alloys. The PEO method can be used to form a thin or thick, hard and adherent ceramic-like coating on the surface of Mg alloys for automotive applications.…”

Section: Introductionmentioning

confidence: 99%

Effect of Nanostructured Oxide Coatings on Tensile Properties of Cast Pure Magnesium

Nie

2015

AMR

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In this work, nanostructured magnesium oxides were formed by PEO process on cast pure magnesium and the tensile properties of thin (5.8 μm) and thick (11.2 μm) coated samples were evaluated. The results obtained by uniaxial tensile testing show that the thin PEO coating had very little effect on the ultimate tensile strength (UTS) and elongation of the cast pure magnesium, while its yield strength was somewhat decreased. For the thick coated sample, both the yield strength and UTS decreased considerably, but the variation of the elongation was moderate, compared to the uncoated sample. The microstructures characterized by SEM revealed that the high porosity content and the large size of pores in the thick PEO coating should be responsible for the significant reduction in the properties of cast pure magnesium. The relationship between the tensile properties and microstructure of the PEO coated samples suggests that the thin PEO coating should be selected to protect the pure magnesium for biodegradable applications.

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