NiTi

This study aims to minimize the mechanical,
chemical and thermal damages on the blades of a compressor
used in aerospace engines by developing a superhydrophobic
coating on the blade surface. In the absence of
any information in open literature for the fabrication of
such coatings, an one-step plasma spray process was
implemented. For this, a well mixed powder of Ni and Ti
was used as feedstock material. The superhydrophobicity
characteristic of the coating was confirmed by the measurement
of the contact (165) and sliding angles (8 ± 1)
by the sessile drop technique. The adhesion test of the
coating showed the high force of adhesion at the interface
with a failure limit of 40.85 MPa. Furthermore, the abrasion
test depicted an excellent abrasion resistance of the
coating. These two investigations indicated that the coatings
had a very high mechanical durability. The coatings
also showed an excellent thermal stability up to 400 C.
Beyond this temperature (at 600 and 900 C), the superhydrophobic
characteristic changed for hydrophobic.
The pH and corrosion tests were also performed to assess
the chemical stability of coatings. They showed that the
coatings retained the superhydrophobic property for pH
ranging between 9.5 and 2.4. Beyond this range, at pH =
10 and pH = 2, the contact angles were 138 and 143,
respectively. In addition, the coatings exhibited a better
corrosion resistance than the substrate and coatings
developed by using other deposition techniques.

Single‐bi‐layer of Ni–Ti thin film was deposited using DC and RF magnetron sputtering technique by layer‐wise deposition of Ni and Ti on Si(100) substrate in the order of Ni as the bottom layer and Ti as the top layer. The deposition of these amorphous as‐deposited thin films was followed by annealing at 300 °C, 400 °C, 500 °C, and 600 °C temperature with 1‐h annealing time for each to achieve crystalline thin films. This paper describes the fabrication processes and the novel characterization techniques of the as‐deposited as well as the annealed thin films. Microstructures were analysed using FESEM and HRTEM. Nano‐indentation and AFM were carried out to characterize the mechanical properties and surface profiles of the films. It was found that, for the annealing temperatures of 300 °C to 600 °C, the increase in annealing temperature resulted in gradual increase in atomic‐cluster coarsening with improved ad‐atom mobility. Phase analyses, performed by GIXRD, showed the development of silicide phases and intermetallic compounds. Cross‐sectional micrographs exhibited the inter‐diffusion between the two‐layer constituents, especially at higher temperatures, which resulted either in amorphization or in crystallization after annealing at temperatures above 400 °C. Copyright © 2015 John Wiley & Sons, Ltd.

We used density functional theory to characterize various crystalline phases of NiTi alloys: (i) high-temperature austenite phase B2; (ii) orthorhombic B19; (iii) the monoclinic martensite phase B190; and (iv) a body-centered orthorhombic phase (BCO), theoretically predicted to be the ground state. We also investigated possible transition pathways between the various phases and the energetics involved. We found B19 to be

Since the introduction of engine-driven nickel-titanium (NiTi) instruments, attempts have been made to minimize or eliminate their inherent defects, increase their surface hardness/flexibility and also improve their resistance to cyclic fatigue and cutting efficiency. The various strategies of enhancing instrument surface include ion implantation, thermal nitridation, cryogenic treatment and electropolishing. The purpose of this paper was to review the metallurgy and crystal characteristics of NiTi alloy and to present a general over review of the published articles on surface treatment of NiTi endodontic instruments.

In this study, patterned microindents are generated on the surface of NiTi shape memory alloy by laser shock assisted direct imprinting (LSADI). During LSADI, the plasma pressure generated by the laser pulse punches the mask into the target material and thus generates patterned indents. It has been demonstrated that thermally controllable surface pattern can be generated on NiTi surface through LSADI. Compared to traditional imprinting techniques, LSADI does not require a sharp mold, nor does it involve any heating or etching process. ...

IntroductionThis clinical study was conducted to investigate the ability of chemomechanical preparation with 2.5% NaOCl + 17% ethylenediaminetetraacetic acid (EDTA) and rotary nickel-titanium (NiTi) system in removing endotoxin from primary root canal infection with apical periodontitis.

This article talks about the economic status of provincial India. It centers on the present status of provincial regions and the emerging powers that will change life in rustic territories through the mid twenty- first century. During the twentieth century, innovation disintegrated the business base of most country networks, discouraged earnings, and made out-relocation the main plan of action for millions. The fortunes of rustic networks are peripatetic. Some are proceeding to meet financial decrease. Others are attempting to adapt to quick development in the populace, land use clashes, and developing interest for open administrations. The twenty-first century could rather support provincial networks. Monetary and segment patterns are diminishing the expense of separation and expanding the estimation of the opportunity. Innovation is lessening the requirement for proximate workers. Interest in the provincial network way of life is developing. With viable provincial policy, rural networks could contribute considerably more to the national economy..

In the current work, by using NiTi plasma spray, superhydrophobic property is developed for compressor parts used in aerospace engine. The durability of the coating enhances in case of droplet impingement in cold condition (temperature = 25 °C). For the hot condition the aforesaid coating needs to become hydrophilic for the retention of high durability characteristic. The discussed switching is achieved by keeping the coating with in an influence of electric field. The results revealed that the surface roughness (12.4 µm) of the coating supports the attainment of superhydrophobic characteristic depicting contact and rolling angle of 164° ± 1.5 and 8° ± 1, respectively at normal condition. By applying electric field, the coating is converted to hydrophilic in hot condition noticed by impact mapping of droplets. Furthermore, it has been observed that the coated steel plate shows better efficiency as compared to uncoated steel plate under electric field.