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Title: High-strength bioresorbable Fe–Ag nanocomposite scaffolds: Processing and properties

High strength ductile iron-silver nanocomposite scaffolds were fabricated employing high energy attrition milling of micron-submicron powders, followed by cold sintering/high pressure consolidation. Particulate leaching method with soluble Na{sub 2}SO{sub 4} and K{sub 2}CO{sub 3} salts as porogens was used to create scaffolds with 50, 55, 60 and 73% volume fraction of pores. Part of specimens was annealed at 600, 800 and 900°C. Specimens were characterized employing X-ray diffraction, scanning electron microscopy (SEM) with electron probe microanalysis (EDS) and high resolution SEM. Mechanical properties were measured in compression and permeability was measured in permeameter based on Darcy’s law. Scaffolds with 50% and 55% porosity exhibited high compressive strength (18–22 MPa), compressive strength of 8–12 MPa was observed for scaffolds with 73% porosity. Treatments at 800 and 900°C result in increase of strength and ductility with some coarsening of microstructure. Best combination of compressive strength (15 MPa) and permeability (0.6{sup −6} cm{sup 2}) is close to the range of trabecular bone.
Authors:
 [1] ;  [2] ;  [3] ;  [2] ;  [2] ;  [1] ; ;  [1] ;  [2]
  1. Department of Materials Science and Technology, Techion-Israel Institute of Technology, Haifa, 32000 Israel (Israel)
  2. (Russian Federation)
  3. Skolkovo Institute of Science and Technology, Skolkovo, 143025 (Russian Federation)
Publication Date:
OSTI Identifier:
22492601
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1683; Journal Issue: 1; Conference: International conference on advanced materials with hierarchical structure for new technologies and reliable structures 2015, Tomsk (Russian Federation), 21-25 Sep 2015; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ANNEALING; COMPRESSION; COMPRESSION STRENGTH; DUCTILITY; ELECTRON MICROPROBE ANALYSIS; IRON; LEACHING; MICROSTRUCTURE; MILLING; PERMEABILITY; POROSITY; POTASSIUM CARBONATES; POWDERS; PRESSURE RANGE MEGA PA 10-100; SCANNING ELECTRON MICROSCOPY; SILVER; SINTERING; SODIUM SULFATES; TRABECULAR BONE; X-RAY DIFFRACTION