Search results for: K.A. Khor

Items from 1 to 20 out of 179 results

article

Higher in-flight particle velocities enhance in vitro tribological behavior of plasma sprayed hydroxyapatite coatings

N.W. Khun, Z. Li, K.A. Khor, J. Cizek

Tribology International > 2016 > 103 > C > 496-503

Hydroxyapatite (HA) coatings were deposited onto Ti6Al4V substrates via atmospheric plasma spraying under systematically varying spray parameters, leading to different in-flight particle velocities. Morphology, composition, and tribological properties of the coatings were then studied. The coatings deposited at higher in-flight particle velocities exhibited smoother surface topography, better inter-particle...

article

Comparative Study on the Corrosion Resistance of Al–Cr–Fe Alloy Containing Quasicrystals and Pure Al

R.T. Li, Vinod K. Murugan, Z.L. Dong, K.A. Khor

Journal of Materials Science & Technology > 2016 > 32 > 10 > 1054-1058

Al–Cr–Fe alloy containing quasicrystals has been consolidated using spark plasma sintering (SPS). Its corrosion resistance properties were comparatively investigated with pure Al by electrochemical methods in 3.5 wt% NaCl solution. Their corrosion current density was also compared with that of three commercial steels—316 stainless steel, AISI 440C stainless steel and AISI H13 tool steel. Al–Cr–Fe...

article

Identifying Indicators of Progress in Thermal Spray Research Using Bibliometrics Analysis

R.-T. Li, K.A. Khor, L.-G. Yu

Journal of Thermal Spray Technology > 2016 > 25 > 8 > 1526-1533

We investigated the research publications on thermal spray in the period of 1985-2015 using the data from Web of Science, Scopus and SciVal^®. Bibliometrics analysis was employed to elucidate the country and institution distribution in various thermal spray research areas and to characterize the trends of topic change and technology progress. Results show that China, USA, Japan, Germany, India and...

article

Al–Cr–Fe quasicrystals as novel reinforcements in Ti based composites consolidated using high pressure spark plasma sintering

R.T. Li, Z.L. Dong, K.A. Khor

Materials & Design > 2016 > 102 > C > 255-263

Ti based metal matrix composites (MMCs) reinforced with Al–Cr–Fe quasicrystals have been prepared using high pressure spark plasma sintering (HP-SPS) with a high heating/cooling rate of 200°C/min between 550°C and 750°C and without any isothermal process. As the sintering pressure increases, the compositional variation of Al–Cr–Fe reinforcements diminishes. It is found that under a sintering pressure...

article

Spark plasma sintering of Al–Cr–Fe quasicrystals: Electric field effects and densification mechanism

R.T. Li, Z.L. Dong, K.A. Khor

Scripta Materialia > 2016 > 114 > C > 88-92

In this study, gas atomized Al–Cr–Fe powders were consolidated using spark plasma sintering (SPS). Hypotheses about the densification mechanism were proposed and effects of the electric field were investigated. The densification is initially controlled by particle rearrangement and then by dislocation motion. The comparison of X-ray diffraction patterns of the SPSed sample and the sample annealed...

article

Microstructure characterization of Al–Cr–Fe quasicrystals sintered using spark plasma sintering

R.T. Li, Z.L. Dong, Vinod K. Murugan, Z.L. Zhang, more

Materials Characterization > 2015 > 110 > C > 264-271

In this study, Al–Cr–Fe powders were consolidated using spark plasma sintering at different temperatures (650°C, 700°C, 750°C and 800°C). The sintered samples were investigated using X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX) and transmission electron microscopy (TEM). The porosity of the pellets is very sensitive to the sintering temperature:...

article

Corrigendum to “Synthesis and characterization on atomphospheric plasma sprayed amorphous silica doped hydrxoyapatite coatings” [Surf. Coat. Technol. 206 (22) (2012) p. 4659–4665]

J.L. Xu, D. Joguet, J. Cizek, K.A. Khor, more

Surface & Coatings Technology > 2013 > 221 > Complete > 222

article

Synthesis and characterization on atomphospheric plasma sprayed amorphous silica doped hydrxoyapatite coatings

J.L. Xu, D. Joguet, J. Cizek, K.A. Khor, more

Surface & Coatings Technology > 2012 > 206 > 22 > 4659-4665

Plasma sprayed hydroxyapatite (HA) coatings have been widely investigated for application on surface of biomedical metals to improve bonding and interaction between body tissues and implant. In this study, a small amount of amorphous silicon dioxide (silica,~1, 2, 5wt.%) was introduced into HA slurry which was subsequently spray-dried into powder form. The powder feedstock was then sprayed onto Ti6Al4V...

article

Spark plasma sintering of sol–gel derived 45S5 Bioglass®-ceramics: Mechanical properties and biocompatibility evaluation

Q.Z. Chen, J.L. Xu, L.G. Yu, X.Y. Fang, more

Materials Science & Engineering C > 2012 > 32 > 3 > 494-502

This work aims to find an efficient sintering technique and optimal sintering conditions of a novel sol–gel derived Bioglass®-ceramic powder so as to achieve much improved mechanical properties compared to conventional Bioglass®. To this end, the spark plasma sintering (SPS) technique was for the first time used to densify the sol–gel derived Bioglass®-ceramic powder. It was found that the sol–gel...

article

Neutron diffraction residual strain measurements in nanostructured hydroxyapatite coatings for orthopaedic implants

R. Ahmed, N.H. Faisal, A.M. Paradowska, M.E. Fitzpatrick, more

Journal of the Mechanical Behavior of Biomedical Materials > 2011 > 4 > 8 > 2043-2054

The failure of an orthopaedic implant can be initiated by residual strain inherent to the hydroxyapatite coating (HAC). Knowledge of the through-thickness residual strain profile in the thermally sprayed hydroxyapatite coating/substrate system is therefore important in the development of a new generation of orthopaedic implants. As the coating microstructure is complex, non-destructive characterization...

article

Determination of the residual stress depth profile of uniaxial compacted ruthenium powder samples by X-ray diffraction

P. Angerer, E. Neubauer, L.G. Yu, K.A. Khor

International Journal of Refractory Metals and Hard Materials > 2009 > 27 > 6 > 1004-1008

Ruthenium samples with a cylindrical shape have been prepared by means of the Spark-Plasma-Sintering (SPS) process at sintering temperatures between 1200°C and 1600°C and a corresponding sintering time of 1min. Similar samples were obtained by conventional hot-pressing process methods at 1200°C and 1400°C for 60min. The residual stress components σ ₁₁ and σ ₃₃ directed parallel and...

article

Protein expression profiles in osteoblasts in response to differentially shaped hydroxyapatite nanoparticles

J.L. Xu, K.A. Khor, J.J. Sui, J.H. Zhang, more

Biomaterials > 2009 > 30 > 29 > 5385-5391

The use of synthetic hydroxyapatite as bone substitute calls for the knowledge of the influence on adjacent cells. The aim of this study was to investigate the proteins with differential protein expression levels in the proteome of human osteoblast cell line incubated separately with various nano sized hydroxyapatite powders with different shapes and chemical compositions using iTRAQ-coupled 2D LC-MS/MS...

article

Antibacterial Property of Cold-Sprayed HA-Ag/PEEK Coating

Noppakun Sanpo, Meng Lu Tan, Philip Cheang, K.A. Khor

Journal of Thermal Spray Technology > 2009 > 18 > 1 > 10-15

The antibacterial behavior of HA-Ag (silver-doped hydroxyapatite) nanopowder and their composite coatings were investigated against Escherichia coli (DH5α). HA-Ag nanopowder and PEEK (poly-ether-ether-ketone)-based HA-Ag composite powders were synthesized using in-house powder processing techniques. Bacteria culture assay of HA-Ag nanopowder and their composite powders displayed excellent bacteriostatic...

article

Preparation and characterization of a novel hydroxyapatite/carbon nanotubes composite and its interaction with osteoblast-like cells

J.L. Xu, K.A. Khor, J.J. Sui, W.N. Chen

Materials Science & Engineering C > 2009 > 29 > 1 > 44-49

Hydroxyapatite (HA) and its based biomaterials could chemically bond directly to bone when implanted, resulting in the formation of a strong bone-implant interface. Carbon nanotubes (CNT) are believed to be very promising in the enhancement ceramic matrix and played an important role as reinforcement for imparting strength and toughness to brittle HA bioceramic. Here we demonstrate the potential use...

article

Residual stress of ruthenium powder samples compacted by spark-plasma-sintering (SPS) determined by X-ray diffraction

P. Angerer, J. Wosik, E. Neubauer, L.G. Yu, more

International Journal of Refractory Metals and Hard Materials > 2009 > 27 > 1 > 105-110

Spark-plasma-sintering (SPS) experiments of cylindrical ruthenium powder samples have been performed at different sintering temperatures between 1200°C and 1600°C applying a comparatively short sintering time of 1min. The compacted samples have been characterized in respect of crystallite size, phase composition, and microstructure by X-ray diffraction and scanning electron microscopy techniques....

article

Hydroxyapatite/titania nanocomposites derived by combining high-energy ball milling with spark plasma sintering processes

Wenxiu Que, K.A. Khor, J.L. Xu, L.G. Yu

Journal of the European Ceramic Society > 2008 > 28 > 16 > 3083-3090

Hydroxyapatite-reinforced nanocomposites with titania nanocrystals addition are prepared by a homogeneous mixing of hydroxyapatite nanoparticles and titania nanocrystals based on high-energy ball milling and spark plasma sintering processes. The microstructural and mechanical properties of the HA/titania composites are studied by X-ray diffractometry analysis, Raman spectrometry, and scanning electron...

article

Residual stress in spark-plasma-sintered and hot-pressed tantalum samples determined by X-ray diffraction methods

P. Angerer, W. Artner, E. Neubauer, L.G. Yu, more

International Journal of Refractory Metals and Hard Materials > 2008 > 26 > 4 > 312-317

Tantalum samples have been compacted by the spark-plasma-sintering (SPS) sintering method. The sintering experiments have been conducted at temperatures between 1500°C and 1900°C and corresponding sintering times of 1min each. The compacted samples of cylindrical shape have been characterized in respect of their residual stress by X-ray diffraction (sin ² ψ-method). The stress components in...

article

In vitro effect of magnesium inclusion in sol–gel derived apatite

Guochao Qi, Sam Zhang, K.A. Khor, Chunming Liu, more

Thin Solid Films > 2008 > 516 > 16 > 5176-5180

Magnesium-containing apatite coatings were prepared on Ti6Al4V substrates by sol–gel dip coating method. Standard simulated body fluid (SBF) was used to evaluate the bioactivity of the coatings. A series of the coatings according to the composition (Ca _10−x Mg _x )(PO ₄ ) ₆ (OH) ₂ , where x=0 to 2, is synthesized and immersed in the standard SBF for periods of...

article

An interfacial study of sol–gel-derived magnesium apatite coatings on Ti6Al4V substrates

Guochao Qi, Sam Zhang, K.A. Khor, Wenjian Weng, more

Thin Solid Films > 2008 > 516 > 16 > 5172-5175

Magnesium apatite coatings on Ti6Al4V substrate were synthesized by the sol–gel dip-coating method. Magnesium was incorporated in the coating according to the formula (Ca _10−x Mg _x )(PO ₄ ) ₆ (OH) ₂ , where x=0, 0.50, 1.00, 1.50 and 2.00. Approximately 2-μm-thick apatite coatings were derived after five cycles of dip–drawing–drying–firing process. A transitional...

article

Evaluation of adhesion strength and toughness of fluoridated hydroxyapatite coatings

S. Zhang, Y.S. Wang, X.T. Zeng, K.A. Khor, more

Thin Solid Films > 2008 > 516 > 16 > 5162-5167

Adhesion strength and fracture toughness are two crucial mechanical properties for bioceramic coatings on metal implants directly affecting successful implantation and long-term stability. In this study, the adhesion strength of sol–gel derived FHA coatings on Ti6Al4V substrates was measured by pull-out tensile test, and the toughness was assessed by energy release method. With increase of the degree...

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Search results for: K.A. Khor

Higher in-flight particle velocities enhance in vitro tribological behavior of plasma sprayed hydroxyapatite coatings

Comparative Study on the Corrosion Resistance of Al–Cr–Fe Alloy Containing Quasicrystals and Pure Al

Identifying Indicators of Progress in Thermal Spray Research Using Bibliometrics Analysis

Al–Cr–Fe quasicrystals as novel reinforcements in Ti based composites consolidated using high pressure spark plasma sintering

Spark plasma sintering of Al–Cr–Fe quasicrystals: Electric field effects and densification mechanism

Microstructure characterization of Al–Cr–Fe quasicrystals sintered using spark plasma sintering

Corrigendum to “Synthesis and characterization on atomphospheric plasma sprayed amorphous silica doped hydrxoyapatite coatings” [Surf. Coat. Technol. 206 (22) (2012) p. 4659–4665]

Synthesis and characterization on atomphospheric plasma sprayed amorphous silica doped hydrxoyapatite coatings

Spark plasma sintering of sol–gel derived 45S5 Bioglass®-ceramics: Mechanical properties and biocompatibility evaluation

Neutron diffraction residual strain measurements in nanostructured hydroxyapatite coatings for orthopaedic implants

Determination of the residual stress depth profile of uniaxial compacted ruthenium powder samples by X-ray diffraction

Protein expression profiles in osteoblasts in response to differentially shaped hydroxyapatite nanoparticles

Antibacterial Property of Cold-Sprayed HA-Ag/PEEK Coating

Preparation and characterization of a novel hydroxyapatite/carbon nanotubes composite and its interaction with osteoblast-like cells

Residual stress of ruthenium powder samples compacted by spark-plasma-sintering (SPS) determined by X-ray diffraction

Hydroxyapatite/titania nanocomposites derived by combining high-energy ball milling with spark plasma sintering processes

Residual stress in spark-plasma-sintered and hot-pressed tantalum samples determined by X-ray diffraction methods

In vitro effect of magnesium inclusion in sol–gel derived apatite

An interfacial study of sol–gel-derived magnesium apatite coatings on Ti6Al4V substrates

Evaluation of adhesion strength and toughness of fluoridated hydroxyapatite coatings

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