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Bimetal Castings with a Titanium Working Layer

Dulska Agnieszka

Archives of Foundry Engineering

2023

Vol. 23, iss. 2

21--28

The paper presents the technology of bimetallic castings using the casting method of applying layers directly during the casting process. The bimetallic casting consists of a load-bearing part (typical casting material, i.e. gray cast iron with flake graphite) and a working part (titanium insert). The titanium insert was made by printing using the selective laser melting (SLM) method, and its shape was spatial. The verification of the bimetallic castings was carried out mainly based on metallographic tests, temperature and thickness measurements. Structure examinations containing metallographic microscopic studies with the use of a light microscope (LOM) and a scanning electron microscope (SEM) with microanalysis of the chemical composition (energy dispersive spectroscopy - EDS).The aim of the tests was to select the appropriate geometrical insert parameters for bimetallic castings within the tested range. The correct parameters of both the insert, pouring temperature and the casting modulus affect the diffusion processes and, consequently, the formation of carbides and the creation of bimetallic castings.

Preparation and characterization of hydrothermally treated hydroxyapatite containing titania layer on commercially pure titanium

Teker D., Muhaffel F., Cimenoglu H.

Archives of Materials Science and Engineering

2014

Vol. 68, nr 1

5--9

Purpose: To investigate the effect of hydrothermal treatment (HT) on bioactivity of micro arc oxidized (MAO) and MAO/) commercially pure titanium (Cp-Ti). Design/methodology/approach: Cp-Ti (Grade IV) samples were oxidized in order to generate titania layer via micro arc oxidation (MAO) process. The samples were treated at 400 V for 5 minutes in a calcium acetate hydrate and disodium hydrogen phosphate anhydrous containing electrolyte. Subsequently, hydrothermal treatment (HT) was applied on oxidized surface in an autoclave with a water solution whose pH adjusted to 11.0-11.5 by adding NaOH, at 200 and 230°C for 2.5, 5 and 10 h and cooled in the autoclave to achieve improved bioactivity behaviour. The bioactivity tests were employed by soaking the samples in a 1.5X simulated body fluid (SBF) to characterize biological response of treated surfaces. The mean elemental composition, surface and cross-sectional morphology, phase composition and surface roughness were examined by energy dispersive spectrometer (EDS) equipped scanning electron microscopy (SEM), X-ray diffractometer (XRD) and profilometer, respectively. Findings: It is found that after MAO+HT process, the surface roughness of the samples was reduced due to the homogeneous distribution of HA agglomerates. The improved surface properties of CP-Ti modified with micro arc oxidation and hydrothermal treatment showed that it can be a good potential candidate for biomedical applications instead of bare CP-Ti. Originality/value: Different HT conditions parameters and the hydroxyapatite crystallization mechanism on oxidized surfaces of the Cp-Ti samples was examined.