Engineering materials with nanocrystalline structure could be exploited under simultaneous action of mechanical loading and corrosion environments; therefore, their corrosion resistance is important. Surface nanocrystalline structure was generated on middle carbon steels by severe plastic deformation using the method of mechanical pulse friction treatment. This treatment additionally includes high temperature phase transformation and alloying. Using a complex of the corrosive, electrochemical and physical investigations, it was established that nanocrystalline structures can be characterized by lower or increased corrosion resistance in comparison with the reference material. It is caused by the action of two confronting factors: arising energy level and anticorrosive alloying of the surface layer.
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http://dx.doi.org/10.1186/s11671-016-1266-3 | DOI Listing |
ACS Nano
January 2025
National Engineering Research Center for Biomaterials, Sichuan University, Chengdu 610064, P. R. China.
Regeneration of diabetic bone defects remains a formidable challenge due to the chronic hyperglycemic state, which triggers the accumulation of advanced glycation end products (AGEs) and reactive oxygen species (ROS). To address this issue, we have engineered a bimetallic metal-organic framework-derived Mn@CoO@Pt nanoenzyme loaded with alendronate and Mg ions (termed MCPtA) to regulate the hyperglycemic microenvironment and recover the osteogenesis/osteoclast homeostasis. Notably, the Mn atom substitution in the CoO nanocrystalline structure could modulate the electronic structure and significantly improve the SOD/CAT catalytic activity for ROS scavenging.
View Article and Find Full Text PDFMicromachines (Basel)
November 2024
School of Materials Science and Chemical Engineering, Harbin University of Science and Technology, Harbin 150080, China.
Integrating nanocrystalline diamond (NCD) films on silicon chips has great practical significance and many potential applications, including high-power electronic devices, microelectromechanical systems, optoelectronic devices, and biosensors. In this study, we provide a solution for ensuring heterogeneous interface integration between silicon (Si) chips and NCD films using low-temperature bonding technology. This paper details the design and implementation of a magnetron sputtering layer on an NCD surface, as well as the materials and process for the connection layer of the integrated interface.
View Article and Find Full Text PDFMaterials (Basel)
December 2024
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China.
High-entropy alloys (HEAs) with ultrafine grained and high strength can be prepared by mechanical alloying (MA) followed by sintering. Therefore, MA, as a unique solid powder processing method, has many effects on the microstructures and mechanical properties of the sintered bulk HEAs. This work focused on the alloying behavior, morphology, and phase evolution of FeCrNiAl (x = 1.
View Article and Find Full Text PDFInt J Mol Sci
December 2024
Institute of Technical Physics and Materials Science, HUN-REN Centre for Energy Research, Konkoly-Thege str. 29-33, H-1121 Budapest, Hungary.
We present a novel method for preparing bioactive and biomineralized calcium phosphate (mCP)-loaded biopolymer composite scaffolds with a porous structure. Two types of polymers were investigated as matrices: one natural, cellulose acetate (CA), and one synthetic, polycaprolactone (PCL). Biomineralized calcium phosphate particles were synthesized via wet chemical precipitation, followed by the addition of organic biominerals, such as magnesium gluconate and zinc gluconate, to enhance the bioactivity of the pure CP phase.
View Article and Find Full Text PDFACS Appl Mater Interfaces
January 2025
Institute of Experimental Physics, Faculty of Mathematics Physics and Informatics, University of Gdańsk, Wita Stwosza 57, Gdańsk 80-308, Poland.
This study examines the structure and properties of NiMo-C coatings synthesized via reactive magnetron sputtering of a NiMo alloy target in an argon/acetylene atmosphere. The coating structure evolves with carbon content from nanocrystalline, through amorphous to quasi-amorphous with a nanocolumnar structure. The nanostructure consists of metallic columns perpendicular to the substrate surrounded by an amorphous carbon shell.
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