Advances in Surface Engineering II: Session II
Sponsored by: TMS Materials Processing and Manufacturing Division, TMS: Surface Engineering Committee
Program Organizers: Tushar Borkar, Cleveland State University; Arif Mubarok, PPG; Rajeev Gupta, North Carolina State University; Sandip Harimkar, Oklahoma State University; Tanaji Paul, Florida International University
Monday 2:30 PM
February 24, 2020
Room: 9
Location: San Diego Convention Ctr
Session Chair: Tushar Borkar, Cleveland State University
2:30 PM
Electroplating Powder for Cold Spray Applications: Gwendolyn Bracker1; Madeline Scott1; Elizabeth Hodges1; Richard Berdos2; Jeffery Rigali3; Victor Champagne4; Robert Hyers5; 1University of Massachusetts; 2Raytheon ; 3Pratt & Whitney; 4Cold Spray Innovations International; 5University of Massachusetts
Cold spray is a processing technique in which powder particles are accelerated toward a substrate on which they deposit and build a wrought coating. In this process it is essential to balance the velocity of the particle, the properties of the particle, and of the substrate; otherwise, the particles may either fail to deposit or, may erode the substrate. Current work is exploring approaches that would allow for harder particles to be deposited on the surface of more ductile substrate without eroding the substrate. One approach to accomplish this is electroplating a softer coating on the hard powder. However, electrodeposits readily form a continuous layer binding the particles into a matrix, rather than uniformly coating the powders. A novel approach to electroplating has been successful with several different combinations of coatings and powders.
2:50 PM
Surface Characterization and Mechanical Properties of Cr-coated Zr-4 Accident Tolerant Fuels Cladding Prepared using Different Coating Techniques: Rajnikant Umretiya1; Santiago Vargas1; Jessika Rojas1; Carlos Castano1; Reza Mohammadi1; 1Virginia Commonwealth University
Accident Tolerant Fuels (ATFs) have the potential to enhance the safety of nuclear power plants by offering better performance during normal operation, transient conditions, and accident scenarios. The development of ATF such as Cr-coated Zircalloy relies on the implementation and success of advanced coating technologies. This work investigates the surface characteristics of ATF cladding tubes of Chromium coated Zircaloy-4 manufactured using different coating techniques, Physical Vapor Deposition and Cold Spray. A comparison of their surface characteristics with current fuel cladding Zircaloy will be presented. After Cr-coating, the contact angle decreased, changing the surface wetting characteristics of the bare substrate. Various roughness parameters and chromium thicknesses have been assessed by advanced materials examination techniques such as Profilometry, AFM, SEM, and FIB. Besides, the hardness and adhesion of the coatings have been measured using micro-indentation and adhesion pull-off testing, respectively.
3:10 PM
Morphological Control of Tantalum Carbide through Surface Doping: Tianqi Ren1; Richard Tran1; Sebastian Lee1; Aric Bandera1; Manuel Herrera2; Xiang-Guo Li1; Shyue Ong1; Olivia Graeve1; 1University of California, San Diego; 2Universidad Nacional Autónoma de México
The morphology of nanoparticles plays a key role in tuning their chemical and physical characteristics. Here, we present a combined experimental and computational effort to explore the effects of surface doping on the surface thermodynamics, and by extension, the morphology of TaC nanoparticles. We base our study on nanoparticles of tantalum carbide doped with nickel, iron, cobalt, yttrium, and titanium and observe a 70% transition from round/irregular spheroids to cubes and cuboctahedrons with addition of various dopants. We determine that dopant segregation to the surface of the nanoparticles results in atomic orbital hybridization resulting in a significant decrease of up to 0.13 eVÅ-2 in the surface energy, thus providing the driving force for morphology control. These principles can be generalized to other transition metal-based ceramic nanoparticles.
3:30 PM
Mitigation of Asphaltene Deposition on Pipeline Alloy Steel Using Low-temperature Pack Aluminization: Soheil Daryadel1; Pralav Shetty1; Velu Subramani2; Paul Braun1; Jessica Krogstad1; 1University of Illinois at Urbana-Champaign; 2BP Products North America, Inc
Carbonaceous deposition is an undesirable phenomenon in the petroleum refineries, which causes significant structural degradation and production downtime. Recently, different methods have been proposed to remove or prevent the deposition. However, they are often expensive and require constant intervention. This work focuses on an innovative industrial-scale surface engineering technique to inhibit asphaltene deposition on pipeline alloy steels. Low-temperature pack aluminization is used on steel substrates to form an aluminide intermetallic layer to bias the native oxide to a protective alumina chemistry. High-temperature fouling experiment with a model sulfur containing asphaltene was conducted on bare and aluminized steel surfaces. Alloys with modified surface chemistry demonstrated significant less mass gain during the fouling test. Results show that the continuous passivating oxide scale acts as a protective barrier against undesirable environment and inhibits the asphaltene deposition. The proposed technique can yield important enhancement in the performance of pipeline steels, particularly in downstream applications
3:50 PM Break
4:10 PM
Pulse Potentiostatic Deposition of Fe-Zn based Intermetallic Coatings and Evaluation of its Catalytic Activity for Hydrogen Evolution Reaction: Srija Biswas1; Sourav Das1; Sambedan Jena2; Arijit Mitra1; Siddhartha Das1; Karabi Das1; 1Department of Metallurgical and Materials Engineering, Indian Institute of Technology Kharagpur; 2School of Nano Science and Technology, Indian Institute of Technology Kharagpur
The current study explores a novel method to obtain Fe-Zn intermetallic coatings from an alkaline, pyrophosphate-based electrolyte, followed by exploration of its application as a catalyst for Hydrogen Evolution Reaction(HER). The deposited intermetallic exhibits appreciable adherence to the underlying copper substrate with superior surface finish. Pulse potentiostatic deposition procedure has been employed to obtain the intermetallic deposits under pulse conditions: (A) -1.3 to -1.8V and (B) -1.6 to -1.8V at ~52 Hz frequency. Linear Sweep Voltammetry(LSV) provides an insight into the reduction mechanism of Fe(2+) to Fe(0) and Zn(2+) to Zn(0) states. Electrochemical Impedance Spectroscopy(EIS) has been carried out to understand the behaviour of the electrolyte and metal-complex species during the electro-deposition process. X-ray Diffraction studies(XRD) and Rietveld refinement verify the formation of Fe-Zn intermetallics. The surface morphology, nano-hardness, scratch, and electrocatalytic properties of these intermetallic coatings have been evaluated.
4:30 PM Cancelled
Effects of Ti and Y Addition on the Scale Spalling Resistance of CoNiCrAl Alloys: Liang Yang1; Yu Zheng1; Zhigang Yang1; 1Tsinghua University
CoNiCrAl is usually used as the material to bond coat in thermal barrier coatings (TBC) systems under high temperatures. With different amounts of reactive elements Ti and Y added into CoNiCrAl, the effects of their adding on Al2O3 scale spalling resistance are ascertained by examining specimens subjected to a cyclic oxidation and an isothermal oxidation experiments. The results show that with the same Y content, increasing Ti to 0.3 wt.% in the alloy, the scale adherence gets better, however, increasing Ti content to 0.5 wt.%, the adherence goes bad. With the same Ti content, when Y in the alloy lowers from 0.4 to 0.1 wt.%, the scale adherence improves. As introduced in our previous work, Ti and Y will both participate in the formation and growth of oxide peg, different sizes of oxide pegs and the interaction between them and reactive element will bring the different effects on the adherence of the scale.