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- 저자 : Anup Kumar Keshri (검색결과 2 건)
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Effect of Plasma Power on Corrosion Behaviour of Plasma Sprayed Hydroxyapatite Coatings
Swarnima Singh,Krishna Kant Pandey,Anup Kumar Keshri 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.11
Hydroxyapatite coating have been deposited on titanium alloys (Ti–6Al–4V) substrate by varying plasma power from 20to 35 kW using atmospheric plasma spraying. Effect of plasma power variation on the microstructure as well as corrosionbehaviour of the coatings has studied exhaustibly in simulated body fluid (SBF). Microstructural analysis revealed thatincreasing the plasma power from 20 to 35 kW has led to a more densified coating by minimizing the level of porosity andpartially melted region as well. This enhanced property is attributed to the higher velocity of the in-flight particles withtheir shorter residence time at 35 kW. The molten particles strike the substrate without losing much of its energy during itsflight, which further boosted the closed packing of the coating layers ensuing a reduced inter-splat region. These improvedmicrostructural properties also escorted to enhancement in corrosion resistance with increase in the plasma power. Thisenhancement in corrosion behaviour at higher power is attributed to reduction in pores and voids in the coatings whichhindered the penetration of SBF solution into the coatings.
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Arunkumar, P.,Aarthi, U.,Sribalaji, M.,Mukherjee, B.,Keshri, Anup Kumar,Tanveer, Waqas Hassan,Cha, Suk-Won,Babu, K. Suresh Elsevier 2018 Journal of alloys and compounds Vol.765 No.-
<P><B>Abstract</B></P> <P>Pure zirconia (ZrO<SUB>2</SUB>) and ceria (16 mol%) stabilized zirconia (CeSZr) thin films were prepared by electron beam physical vapor deposition with varying deposition rates (1, 4 and 8 Å/s) in order to correlate the phase changes to the mechanical property. X-ray diffraction and Raman spectra results indicate the presence of mixed monoclinic and tetragonal phases in ZrO<SUB>2</SUB> film, but tetragonal phase dominated at lower deposition rate. However, irrespective of the deposition rate, cerium addition to ZrO<SUB>2</SUB> resulted in complete stabilization of tetragonal phase. Depending on the presence of dual (ZrO<SUB>2</SUB>) or single (CeSZr) phase, either surface cracks or well-connected grain structure was observed in SEM, respectively. Thus, CeSZr film showed a four-fold increase in hardness in comparison to ZrO<SUB>2</SUB>, which can be attributed to the complete stabilization of tetragonal phase that hinders the crack propagation along the grain. Plastic deformation of CeSZr film was found to be 1.80 × 10<SUP>−2</SUP> GPa, which is about ∼55% higher as compared to pure ZrO<SUB>2</SUB> film (8.04 × 10<SUP>−3</SUP> GPa). Thus, the development of CeSZr coating may lead to better surface protection of many components.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Zirconia and ceria (16 mol%) stabilized zirconia (CeSZr) films deposited by EB-PVD. </LI> <LI> ZrO2 thin film showed mixed tetragonal and cubic structure. </LI> <LI> CeSZr thin film formed with single phase tetragonal structure. </LI> <LI> CeSZr film exhibited a four-fold increase in hardness in comparison to ZrO2 film. </LI> <LI> Deposition rate and chemistry influence the mechanical property of films. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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