Structure and Properties of Co-Cr-Mo Alloy Manufactured by Powder Injection Molding Method
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2021
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Abstract
Cobalt–chromium–molybdenum alloys samples were obtained by the powder injection molding method (PIM). PIM is dedicated to the mass production of components and can manufacture several grades of dental screws, bolts, stabilizers, or implants. As a skeleton component, ethylene–vinyl acetate (EVA copolymer) with a low temperature of processing and softening point was used. The choice of a low-temperature binder made it necessary to use a coarse ceramic powder as a mechanical support of the green sample during sintering. The injection-molded materials were thermally degraded in N2 or Ar-5%H2 and further sintered in N2-5%H2 or Ar-5%H2 at 1300 or 1350 °C for 30 min. The structure of the obtained samples was characterized by X-ray diffraction and electron microscopy. Mechanical properties, including hardness and three-point bending tests, confirmed that a nitrogen-rich atmosphere significantly increases the bending strength compared to the material manufactured in Ar-5%H2. This is due to the precipitation of numerous fine nitrides and intermetallic phases that strengthen the ductile γ-phase matrix.
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matula2021materialsstructure
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| Authors | Grzegorz Matula;Aleksandra Szatkowska;Krzysztof Matus;Błażej Tomiczek;Mirosława Pawlyta;Matula, Grzegorz;Szatkowska, Aleksandra;Matus, Krzysztof;Tomiczek, Błażej;Pawlyta, Mirosława; |
| Journal | Materials (Basel, Switzerland) |
| Year | 2021 |
| DOI |
10.3390/ma14082010
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