<abstract xmlns="http://www.w3.org/1999/xhtml">

The use of resorbable metallic biomaterials for temporary implants has increased dramatically in the last decade. Degradable biomaterials are desirable in some specific pediatric, orthopedic, and cardiovascular applications, in which they may overcome the disadvantages of permanent devices. The three main biodegradable metals: Mg, Fe, and Zn, are intensively studied as temporary orthopedic implant materials. Among them, iron, and iron-based alloys, have received attention as promising materials for the temporary replacement of bones, especially for applications where strong mechanical support during the bone healing process is required. The addition of a low amount of phosphorus can improve the mechanical properties of such materials without the risk of retarding the corrosion rate or affecting cell proliferation. The main goal of this work was to study the combined effect of phosphating and polymer coating of open-cell iron foams on their cytotoxicity and hemocompatibility. Obtained results indicated the positive influence of the PEG coating layer and phosphorus addition on material cytocompatibility. Moreover, the combination of these procedures led to the inhibition of hemolysis, platelet adhesion, and thrombus formation.
</abstract>

Department of Physical Chemistry, Faculty of Science

Department of Animal Nutrition, Dietetics and Animal Breeding

University of Veterinary Medicine and Pharmacy in Košice

Combined Effect of Phosphate and Polymer Coating on Cytotoxicity and Hemocompatibility of Iron Foams

<abstract xmlns="http://www.w3.org/1999/xhtml">

Advanced high-entropy (Hf-Ta-Zr-Nb-Ti)C ceramics were successfully fabricated by the combination of ball milling and a two-step sintering process at 2100 °C for 5, 10, and 20 minutes from commercially available powders. The microstructure characteristics and mechanical properties of the developed systems were investigated. The high-entropy ceramics exhibit: medium grain size from 8 μm to 11 μm, high compositional uniformity, and high relative density above 99.5 %. Vickers hardness for all systems decreased with increasing applied load, with the highest value HV1 = 22.0 GPa for the system sintered for 5 minutes, while the fracture toughness changed from 2.70 MPa.m1/2 to 3.50 MPa.m1/2. The highest four-point flexural strength of 284 MPa was measured for the system with the smallest grain size.
</abstract>

Technical University of Kosice, Faculty of Materials, Metallurgy, and Recycling

Effect of Sintering Time on Mechanical Properties of (Hf-Ta-Zr-Nb-Ti)C

Announcements: Eva Dudrová – 80 years

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Powder Metallurgy Progress

Volume 21 (2021): Issue 2 (December 2021)

Combined Effect of Phosphate and Polymer Coating on Cytotoxicity and Hemocompatibility of Iron Foams

Effect of Sintering Time on Mechanical Properties of (Hf-Ta-Zr-Nb-Ti)C

Announcements: Eva Dudrová – 80 years

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