All Outputs (47)

Gas and liquid-fuelled HVOF spraying of Ni50Cr coating: microstructure and high temperature oxidation (2016)
Journal Article
Song, B., Pala, Z., Voisey, K., & Hussain, T. (in press). Gas and liquid-fuelled HVOF spraying of Ni50Cr coating: microstructure and high temperature oxidation. Surface and Coatings Technology, https://doi.org/10.1016/j.surfcoat.2016.07.046

Ni50Cr thermally sprayed coatings are widely used for high temperature oxidation and corrosion in thermal power plants. In this study, a commercially available gas atomised Ni50Cr powder was sprayed onto a power plant alloy (ASME P92) using both gas... Read More about Gas and liquid-fuelled HVOF spraying of Ni50Cr coating: microstructure and high temperature oxidation.

Modelling and experimental study on ?-phase depletion behaviour of HVOF sprayed free-standing CoNiCrAlY coatings during oxidation (2016)
Journal Article
Chen, H., Jackson, G., Voisey, K., & McCartney, D. (2016). Modelling and experimental study on ?-phase depletion behaviour of HVOF sprayed free-standing CoNiCrAlY coatings during oxidation. Surface and Coatings Technology, 291, 34-42. https://doi.org/10.1016/j.surfcoat.2016.02.008

This paper investigates the β-phase depletion behaviour during oxidation of free-standing CoNiCrA1Y (Co-31.7%Ni-20.8%Cr-8.1%A1-0.5%Y, all in wt%) bond coats prepared by high velocity oxy-fuel (HVOF) thermal spraying. The microstructure of the coating... Read More about Modelling and experimental study on ?-phase depletion behaviour of HVOF sprayed free-standing CoNiCrAlY coatings during oxidation.

Effects of pre-cracking on small punch creep testing of a vacuum plasma-sprayed CoNiCrAlY coating (2016)
Journal Article
Chen, H., Hyde, T., Voisey, K., & McCartney, D. (2018). Effects of pre-cracking on small punch creep testing of a vacuum plasma-sprayed CoNiCrAlY coating. Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications, 232(3), 242-249. doi:10.1177/1464420715622495

This paper presents the results of small punch creep testing (SPCT) of a vacuum plasma-sprayed (VPS) CoNiCrAlY coating (Co – 31.7%, Ni – 20.8%, Cr – 8.1%, Al – 0.5%, Y, all in wt%) carried out at 750 grad. C. Coating cross-sections, after initial hea... Read More about Effects of pre-cracking on small punch creep testing of a vacuum plasma-sprayed CoNiCrAlY coating.

Laser cladding of Ni50Cr: A parametric and dilution study (2016)
Conference Proceeding
Song, B., Hussain, T., & Voisey, K. T. (2016). Laser cladding of Ni50Cr: A parametric and dilution study. . https://doi.org/10.1016/j.phpro.2016.08.072

© 2016 The Authors. The increasing use of biomass as a fuel is leading to higher fireside corrosion of the heat exchangers in boilers due to the high chlorine and alkali metal content in the fuel. Laser cladding of Ni50Cr is a promising technique to... Read More about Laser cladding of Ni50Cr: A parametric and dilution study.

Green corrosion inhibitors: amino acids and plant extracts (2015)
Conference Proceeding
Elphick, D., Ajayi, O., Everitt, N., & Voisey, K. (2015). Green corrosion inhibitors: amino acids and plant extracts.

Corrosion inhibitors are chemicals that are used in many industries to control corro-sion. As they are injected into process streams they have to be continually replen-ished in order to maintain protection. Many chemicals used are environmentally un-... Read More about Green corrosion inhibitors: amino acids and plant extracts.

Laser drilling of via micro-holes in single-crystal semiconductor substrates using a 1070nm fibre laser with millisecond pulse widths (2015)
Journal Article
Maclean, J. O., Hodson, J. R., & Voisey, K. T. (2015). Laser drilling of via micro-holes in single-crystal semiconductor substrates using a 1070nm fibre laser with millisecond pulse widths. Proceedings of SPIE, 9657, Article 965704. https://doi.org/10.1117/12.2175898

© 2015 SPIE. Micro-machining of semiconductors is relevant to fabrication challenges within the semiconductor industry. For via holes for solar cells, laser drilling potentially avoids deep plasma etching which requires sophisticated equipment and co... Read More about Laser drilling of via micro-holes in single-crystal semiconductor substrates using a 1070nm fibre laser with millisecond pulse widths.

Effect of surface conditions on internal oxidation and nitridation of HVOF MCrAlY coatings (2015)
Journal Article
Chen, H., McCartney, D., & Voisey, K. (in press). Effect of surface conditions on internal oxidation and nitridation of HVOF MCrAlY coatings. Materials at High Temperatures, 32(1-2), https://doi.org/10.1179/0960340914Z.000000000103

This study deals with the isothermal oxidation behaviour of high velocity oxy-fuel sprayed MCrAlY coatings. Both free-standing coatings and coatings attached to IN738 and CMSX4 substrates undergo isothermal oxidation at 1100°C for up to 100h. The eff... Read More about Effect of surface conditions on internal oxidation and nitridation of HVOF MCrAlY coatings.

Effect of Q-switched laser surface texturing of titanium on osteoblast cell response (2014)
Journal Article
Voisey, K., Scotchford, C., Martin, L., & Gill, H. (2014). Effect of Q-switched laser surface texturing of titanium on osteoblast cell response. Physics Procedia, 56, https://doi.org/10.1016/j.phpro.2014.08.027

Titanium and its alloys are important biomedical materials. It is known that the surface texture of implanted medical devices affects cell response. Control of cell response has the potential to enhance fixation of implants into bone and, in other ap... Read More about Effect of Q-switched laser surface texturing of titanium on osteoblast cell response.

Fibre laser piercing of mild steel: the effects of power intensity, gas type and pressure (2014)
Journal Article
Hashemzadeh, M., Powell, J., & Voisey, K. (2014). Fibre laser piercing of mild steel: the effects of power intensity, gas type and pressure. Optics and Lasers in Engineering, 55, https://doi.org/10.1016/j.optlaseng.2013.10.001

Laser piercing is used to generate a starting point for laser cutting. The pierced hole is normally larger than the kerf width, which means that it cannot lie on the cut line. An experimental program investigating the piercing process as a function o... Read More about Fibre laser piercing of mild steel: the effects of power intensity, gas type and pressure.

The application of specific point energy analysis to laser cutting with 1 ?m laser radiation (2014)
Journal Article
Hashemzadeh, M., Suder, W., Williams, S., Powell, J., Kaplan, A., & Voisey, K. (2014). The application of specific point energy analysis to laser cutting with 1 ?m laser radiation. Physics Procedia, 56, https://doi.org/10.1016/j.phpro.2014.08.110

Specific point energy (SPE) is a concept that has been successfully used in laser welding where SPE and power density determine penetration depth. This type of analysis allows the welding characteristics of different laser systems to be directly comp... Read More about The application of specific point energy analysis to laser cutting with 1 ?m laser radiation.

Effect of prior laser microstructural refinement on the formation of amorphous layer in an Al86Co7.6Ce6.4 alloy (2014)
Journal Article
Li, C., Murray, J., Voisey, K., Clare, A., & McCartney, D. (2014). Effect of prior laser microstructural refinement on the formation of amorphous layer in an Al86Co7.6Ce6.4 alloy. Applied Surface Science, 289, https://doi.org/10.1016/j.apsusc.2013.10.140

Laser surface melting (LSM) pre-treatment was conducted before large area electron beam (LAEB) treatment in an attempt to eliminate the cracking of the amorphous layer. In our previous work, LAEB treatment successfully generated an amorphous layer on... Read More about Effect of prior laser microstructural refinement on the formation of amorphous layer in an Al86Co7.6Ce6.4 alloy.

Neutron strain scanning of fibre and diode laser welds in stainless steel and Ti6Al4V (2014)
Journal Article
Voisey, K., Folkes, J., Srithorn, J., & Hughes, D. (2014). Neutron strain scanning of fibre and diode laser welds in stainless steel and Ti6Al4V. Physics Procedia, 56, https://doi.org/10.1016/j.phpro.2014.08.051

Fibre lasers provide an unprecedented combination of high beam quality, brightness and low cost. Fibre laser beams can provide an exceptionally high power density beam with a relatively large depth of focus. Compared to more established laser welding... Read More about Neutron strain scanning of fibre and diode laser welds in stainless steel and Ti6Al4V.

Application of small punch creep testing to a thermally sprayed CoNiCrAlY bond coat (2013)
Journal Article
Chen, H., Hyde, T., Voisey, K., & McCartney, D. (2013). Application of small punch creep testing to a thermally sprayed CoNiCrAlY bond coat. Materials Science and Engineering: A, 585, https://doi.org/10.1016/j.msea.2013.06.080

High velocity oxy-fuel thermal spraying was used to prepare free-standing CoNiCrAlY (Co–31.7% Ni–20.8% Cr–8.1% Al–0.5% Y (wt%)) bond coat alloy samples approximately 0.5 mm thick. Creep tests were conducted at 750 °C on these samples using a small pu... Read More about Application of small punch creep testing to a thermally sprayed CoNiCrAlY bond coat.

Amorphous layer formation in Al86.0Co7.6Ce6.4 glass-forming alloy by large-area electron beam irradiation (2013)
Journal Article
Li, C., Murray, J., Voisey, K., Clare, A., & McCartney, D. (2013). Amorphous layer formation in Al86.0Co7.6Ce6.4 glass-forming alloy by large-area electron beam irradiation. Applied Surface Science, 280, https://doi.org/10.1016/j.apsusc.2013.05.005

Amorphous Al-Co-Ce alloys are of interest because of their resistance to corrosion, but high cooling rates are generally required to suppress the formation of crystalline phases. In this study, the surface of a bulk crystalline Al-Co-Ce alloy of a gl... Read More about Amorphous layer formation in Al86.0Co7.6Ce6.4 glass-forming alloy by large-area electron beam irradiation.

Corrosion behaviour of crystalline and amorphous forms of the glass forming alloy Fe43Cr16Mo16C15B10 (2012)
Journal Article
Bakare, M., Voisey, K., Chokethawai, K., & McCartney, D. (in press). Corrosion behaviour of crystalline and amorphous forms of the glass forming alloy Fe43Cr16Mo16C15B10. Journal of Alloys and Compounds, 527, https://doi.org/10.1016/j.jallcom.2012.02.127

The corrosion behaviour of both crystalline and largely amorphous forms of the Fe-based glass forming alloy, Fe43Cr16Mo16C15B10 alloy was investigated. Two different methods were used to induce transformation to the amorphous form of the alloy: laser... Read More about Corrosion behaviour of crystalline and amorphous forms of the glass forming alloy Fe43Cr16Mo16C15B10.

Abrasive wear behaviour of conventional and large-particle tungsten carbide-based cermet coatings as a function of abrasive size and type (2011)
Journal Article
Kamdi, Z., Shipway, P., Voisey, K., & Sturgeon, A. (2011). Abrasive wear behaviour of conventional and large-particle tungsten carbide-based cermet coatings as a function of abrasive size and type. Wear, 271(9-10), https://doi.org/10.1016/j.wear.2010.12.060

Abrasive wear behaviour of materials can be assessed using a wide variety of testing methods, and the relative performance of materials will tend to depend upon the testing procedure employed. In this work, two cermet type coatings have been examined... Read More about Abrasive wear behaviour of conventional and large-particle tungsten carbide-based cermet coatings as a function of abrasive size and type.

Scanning electrochemical microscopy at thermal sprayed anti-corrosion coatings: effect of thermal spraying on heterogeneous electron transfer kinetics (2011)
Journal Article
Niaz, A., Boatwright, A., Voisey, K., & Walsh, D. A. (2011). Scanning electrochemical microscopy at thermal sprayed anti-corrosion coatings: effect of thermal spraying on heterogeneous electron transfer kinetics. Journal of Electroanalytical Chemistry, 657(1-2), https://doi.org/10.1016/j.jelechem.2011.03.009

The effect of thermal spraying on the electrochemical activity of an anti-corrosion superalloy was studied quantitatively using scanning electrochemical microscopy (SECM). The superalloy used was Inconel 625 (a Ni base superalloy) and thin coatings o... Read More about Scanning electrochemical microscopy at thermal sprayed anti-corrosion coatings: effect of thermal spraying on heterogeneous electron transfer kinetics.

Mechanical properties and microstructure of VPS and HVOF CoNiCrAlY coatings (2011)
Journal Article
Saeidi, S., Voisey, K., & McCartney, D. (2011). Mechanical properties and microstructure of VPS and HVOF CoNiCrAlY coatings. Journal of Thermal Spray Technology, 20(6), https://doi.org/10.1007/s11666-011-9666-5

HVOF and VPS coatings were sprayed using a Praxair (CO-210-24) CoNiCrAlY powder. Free standing coatings underwent vacuum annealing at different temperatures for times of up to 840h. Feedstock powder, as-sprayed and annealed coatings were characterise... Read More about Mechanical properties and microstructure of VPS and HVOF CoNiCrAlY coatings.

Fibre laser cutting of thin section mild steel: an explanation of the 'striation free' effect (2011)
Journal Article
Powell, J., Al-Mashikhi, S., Kaplan, A., & Voisey, K. (2011). Fibre laser cutting of thin section mild steel: an explanation of the 'striation free' effect. Optics and Lasers in Engineering, 49(8), https://doi.org/10.1016/j.optlaseng.2011.03.011

This paper presents the results of an experimental and theoretical investigation into the phenomenon of 'striation free cutting', which is a feature of fibre laser/oxygen cutting of thin section mild steel. The paper concludes that the creation of ve... Read More about Fibre laser cutting of thin section mild steel: an explanation of the 'striation free' effect.

Heat affected zones and oxidation marks in fiber laser-oxygen cutting of mild steel (2011)
Journal Article
Al-Mashikhi, S., Powell, J., Kaplan, A., & Voisey, K. (2011). Heat affected zones and oxidation marks in fiber laser-oxygen cutting of mild steel. Journal of Laser Applications, 23(4), https://doi.org/10.2351/1.3614404

The effect of cutting speed and sheet thickness on surface oxidation and heat affected zones (HAZs) has been investigated for laser-oxygen cutting of mild steel sheet with a fiber laser. Optical and scanning electron micrographs were used to determin... Read More about Heat affected zones and oxidation marks in fiber laser-oxygen cutting of mild steel.