Amorphous Coatings and Surfaces on Structural Materials

Joshi, Sameehan S.; Katakam, Shravana; Arora, Harpreet Singh; Mukherjee, Sundeep; Dahotre, Narendra B.

doi:10.1080/10408436.2015.1053602

Cited by 82 publications

(25 citation statements)

References 119 publications

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“…Although a high laser fluence (power) input leads to formation of an integral metallurgical bond through melting of the coating and part of the substrate, it also contributes to undesirable compositional dilution between the coating and the substrate . Accordingly, laser processing at higher fluence (power) input increased Al concentration in the glass coating (Figures and ). On the contrary, lower laser fluence (power) has lower level of mixing and change of the glass composition but it will result in poor adhesion of the coating with the substrate .…”

Section: Discussionmentioning

confidence: 91%

Laser coating of bioactive glasses on bioimplant titanium alloys

Kuo

Joshi

et al. 2018

Int J of Appl Glass Sci

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Laser-assisted material processing is a promising field for new material synthesis. This study explores the feasibility of using laser as a tool to synthesize SiO 2 -Na 2 O-CaO-P 2 O 5 bioactive glass coatings on Ti-6Al-4V alloy for bio-implant application. Various laser processing conditions were explored to investigate their effects on coating characteristics. Detailed microstructure and elemental distribution on the top surface and in the cross-sectional region of the bioactive glasscoated alloy were investigated by scanning electron microscope and energy dispersive spectroscopy. Bio-mineralization in simulated body fluid for both representative-coated samples and uncoated control sample for comparison was carried out. The thermokinetic effects during laser processing were simulated using a multi-physics finite element model. The results demonstrated synthesis of bioactive glass coating on the metal substrate with local segregation of Na, P, and Si elements and considerable dilution of Al and Ti in the coating from the alloy substrate impacted the bioactivity of the coating. Although the observations suggest that the laser processing is a promising method in applying bioactive glasses coatings, further efforts are warranted to optimize laser processing conditions to produce adherent coating while retaining its bioactivity. K E Y W O R D S

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Section: Discussionmentioning

confidence: 91%

Laser coating of bioactive glasses on bioimplant titanium alloys

Kuo

Joshi

et al. 2018

Int J of Appl Glass Sci

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“…Laser are employed for variety of applications such as bar code scanners [5], sensing [6,7], heat treatment [8-10], surface engineering [11,12], and machining of various materials [2]. In the medical field, they have been used for various surgeries in the fields including dentistry, opthalmology, and orthopedics.…”

Section: Laser Machiningmentioning

confidence: 99%

Non-conventional and Hybrid Methods of Bone Machining

Dahotre

Joshi

2016

Machining of Bone and Hard Tissues

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Having explored the basics of important fundamental contact (mechanical) and noncontact (thermal) operations involved in machining of the bones, the discussion will proceed towards some of the non-conventional techniques. These techniques have evolved as a result of research works on interaction of bones with various energy sources such as photon/electron beam and mechanical vibrations. Hybrids of fundamentals operations of machining have also been taken into account. Laser, microwave, and ion-beam based methods have been discussed under beam based techniques. Ultrasonic machining which has been extensively explored for bone application has been dealt in a separate section. Pneumatic and hydraulic machining have been taken into account under the section on hybrid machining. These nonconventional/hybrid techniques are not as popular as conventional ones but hold a huge potential for the future. High Energy Beam Based TechniquesThe high energy beam based methods employ some sort of radiation as the means of energy source for removal of the bone material. These techniques have mostly been employed previously in case of the structural materials. Unlike conventional mechanical contact methods employing physical tools which result in generation of heat as the secondary effect, beam based techniques employ heat as the primary means of tooling. The heat is generated by means of various electromagnetic waves within the electromagnetic spectrum such as ultraviolet, microwave, and infrared with various combinations for ranges of energy and wavelength ( Fig. 3.1). As the combinations dictate the extent and mode of interaction of the energy source with the workpiece, any machining operation can be carried out with careful process control. Most common methods explored in this category include laser, ion-beam, and microwave machining which are discussed in detail in the following subsections. Laser MachiningLasers (Light Amplification by Stimulated Emission of Radiation) have been used as a means of machining for quite some time now. Theoretically any wavelength within the electromagnetic spectrum can be made into a laser source. Principally, a lasing medium is excited using a energy source such as inert gas flash lamp. The input of energy (Fig. 3.2a) transfers the electrons within the atoms of the medium to higher energy state, technically termed as population inversion. On the other hand, the random absorption of energy gives rise to spontaneous emission (Fig. 3.2b). In case of population inversion, these electrons jump to lower energy state at the same time emitting photons of the same energy corresponding to difference between ground and excited state (Fig. 3.2c). A set of two mirrors, some times called resonators, one totally and the other partially reflecting, generates the chain reaction giving rise to highly concentrated beam coming out of the partially reflecting mirror (Fig. 3.3). This beam is monochromatic, coherent, and highly collimated in nature and can be employed for various applications depending on the wavele...

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“…Wear volume Sliding distance × Normal load (1) The worn morphologies and chemical compositions were characterized by S3400 scanning electron microscopy (SEM, Hitachi, Ltd., Tokyo, Japan) and energy dispersive X-ray spectrometer (EDS, Hitachi, Ltd.). Figure 1 plots the loop curves of nanoindentation tests for the FePSiB-based coatings and Q235 steel substrate.…”

Section: Materials and Experimental Proceduresmentioning

confidence: 99%

“…The discovery of metallic glass coating (MGCs) technology is a remarkable way of making use of the superior properties of amorphous alloys for structural applications [1][2][3][4]. MGCs have been proved an effective way to improve surface properties such as anti-corrosion and wear resistance [2][3][4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Effects of Cr and Nb Additions on Sliding Wear Behaviors of the FePSiB Coatings

et al. 2018

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The tribological properties of the FePSiB amorphous/nanocrystalline coatings with Cr and Nb additions were investigated in reciprocating mode against tungsten carbide friction coupling with different dry sliding conditions. The wear rates of the FePSiB-based coatings increase linearly with the normal load and sliding speed. The coatings with Cr and Nb promote the formation of successive and compact oxide film on friction surface, which decreases significantly wear rate of the coating. Nano-mechanical characterization done to map the correlation between the elastic properties and wear resistance. The main damage mechanisms of the FePSiB-based coatings under dry friction conditions are abrasion wear, delamination failure and oxidation wear.

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Amorphous Coatings and Surfaces on Structural Materials

Cited by 82 publications

References 119 publications

Laser coating of bioactive glasses on bioimplant titanium alloys

Laser coating of bioactive glasses on bioimplant titanium alloys

Non-conventional and Hybrid Methods of Bone Machining

Effects of Cr and Nb Additions on Sliding Wear Behaviors of the FePSiB Coatings

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