Advanced Functional and Structural Thin Films and Coatings: Coating Technologies and Surface Structuring for Tools II
Sponsored by: TMS Functional Materials Division, TMS: Thin Films and Interfaces Committee
Program Organizers: Adele Carrado, University of Strasbourg; Ramana Chintalapalle, University of Texas at El Paso; Gerald Ferblantier, University of Strasbourg - IUT LP / ICube Laboratory - CNRS; Nancy Michael, University of Texas at Arlington; Karine Mougin, Cnrs, Is2m; Heinz Palkowski, Clausthal University of Technology; Nuggehalli Ravindra, New Jersey Institute of Technology; Vikas Tomar, Purdue University
Thursday 8:30 AM
March 18, 2021
Room: RM 19
Location: TMS2021 Virtual
Session Chair: Heinz Palkowski, IMET; Ravindra Nuggehalli, New Jersey Institute of Technology
8:30 AM Invited
Nanoengineered Coating; Lotus Effect, Morphology, Contact Angles and Wettability: Narsingh Singh1; Lisa Kelly1; Narasimha Prasad1; Brett Setera1; Stacey Sova1; David Sachs1; Bradley Arnold1; Fow-Sen Choa1; Christopher Cooper1; 1University of Maryland, Baltimore County
The lotus effect is known from centuries for self-cleaning properties in nature for leaves of the lotus plant. The understanding of the surface behavior, interaction, wettability and topographies of surfaces with fluids is very important to remove impurities from the electronic and optical devices and components. We synthesized nano particle filled composites by wet and semi wet techniques to achieve hydrophobicity and hence the lotus effect. Nanocomposites with different composition of polymers doped with titania nanoparticles were studied to evaluate effects on wettability. Light scattering methods were used to study the absorptions and particle size. The contact angle and hydrophobic characteristics were very composition dependent in thin film composites. At certain compositions, we observed that material showed very high anisotropy in droplet shapes which diminished with loadings of nanoparticles. These composites did not show any change in hydrophobic characteristics when exposed with ultraviolet radiation.
9:00 AM
High-quality Diamond Films on Q-carbon Coated Austenitic Stainless Steels 304 and 316: Pratik Joshi1; Siddharth Gupta2; Ariful Haque2; Jagdish Narayan2; 1NC State University; 2Intel Corporation
Coatings of diamond-related materials are appealing owing to their high hardness but exhibit inadequate adhesion and toughness, especially on stainless steel substrates. In this study, we have studied the effect of surface scratch and Q-carbon interlayer on the nucleation and growth of CVD microdiamonds on 304 and 316 austenitic SS. The quality of the diamond films was assessed using SEM, XRD, and Raman spectroscopy. We have also characterized the inclusions in diamonds grown on bare SS using EBSD. The Q-carbon seed layer helped growth of better quality diamonds (50% less graphitic) with FWHM of 11.5 cm-1 and demonstrated higher nucleation density in comparison with amorphous carbon-coated and bare 316 SS substrates. Diamonds grown on Q-carbon displayed ballas type of microstructure indicative of high toughness. This study on Q-carbon nanocomposite coatings provides a new pathway for fabricating ultrahard carbon-based coatings on stainless steels for biomedical and tribocorrosive applications.
9:20 AM
Ni-Zn-Al2O3 Cermet Nanocomposite Coatings by High-pressure Cold Spraying: V S N Jagannadh Sripada1; Gobinda Saha1; 1University of New Brunswick
One of the challenges in transportation vehicles such as aerospace, automotive, and rail cars is the greenhouse gas (GHG) emission associated with high fuel consumption. Structural lightweighting aims to tackle this problem by careful design and selection of materials at the component conceptual design stage. Once adopted, their manufacturing requires nanoscale material deposit and built of the component so to develop the competitive mechanical and tribological properties concurrently.This research is focused on the development of nanostructured surface protective coatings and 3D-freeform components on the sole idea of ceramic-metallic (cermet) composite materials. This paper presents the design of a novel cermet Ni-Zn-Al2O3 feedstock particle in high-energy mechanical alloying (HE-MA) process, followed by their deposition in a high-pressure cold spray (HPCS) additive manufacturing process. Results from investigating the feedstock deposition efficiency (DE) and bonding mechanisms will be presented on the merit of both feedstock and spray process detailed parametric study.
9:40 AM Invited
Manipulating Polyolefin Performance by Control of Morphology through Processing: Michael Jaffe1; 1New Jersey Innovation institute
While polymer backbone chemistry may play a limiting role in polymer performance, control of morphology through processing enables the use of a given chemistry for wide range of applications. One example of this is the use of high density polyethylene in grocery bag and the use of the same chemistry to provide high strength, high modulus fibers used in ballistic protection helmets. While one usually associates high modulus polyethylene products with ultra-high molecular weight and gel spinning, it was shown by the late Professor Ian M. Ward that similar moduli could be obtained from moderate molecular weight polyethylene and melt spinning. Recent work at MIT showed that ultra-oriented polyethylene nanofibers showed Griffith behavio. At a time where the ecological impact of plastics is under scrutiny, the use of a given chemistry over a wider range is applications is again becoming attractive and presents opportunity for the future.