Al2O3 ceramic reinforced with 4-wt% multiwalled carbon nanotube (CNT) is plasma sprayed for improving the fracture toughness of the nanocomposite coating. Two different methodologies of CNT addition have been adopted in the powder feedstock to assist CNT dispersion in the nano-Al2O3 matrix. First, spray-dried nano-Al2O3 agglomerates are blended with 4 wt% CNT as powder-feedstock, which is subse...

In severe conditions, braking may cause the temperature on the disc-pad interface to rise up to 800 °C 1 . At such a temperature, the properties of organic compounds are disrupted, coefficient of friction (CoF) decreases, and the rate of wear increases exponentially. This phenomenon is called “fade” 2 . Ideal brake pads, without causing any fades, are expected to function in uniform and stable ...

D. Niblett, S. C. Porter, I. Gabbott, G. Reynolds, T. Morgan, K. Karan, J. Greenamoyer, R. Hach University of Manchester, Ashland Specialty Ingredients, AstraZeneca Purpose Aqueous film coating still remains a complex process in which the process parameters selected can have a major impact on ultimate product quality. In this study, a wide range of processing parameters was performed in order t...

High-velocity oxygen fuel (HVOF) thermal spraying uses a combustion process to heat the gas flow and coating material. A computational fluid dynamics (CFD) model has been developed to predict gas dynamic behavior in a HVOF thermal spray gun in which premixed oxygen and propane are burnt in a combustion chamber linked to a parallel-sided nozzle. The CFD analysis is applied to investigate axisymm...

Glassy deposits mainly comprising of calcium–magnesium–alumina–silicate (CMAS) accelerate the spallation thermal barrier coatings (TBCs). In this work, an Al2O3 layer was produced on yttria-stabilized zirconia (YSZ) coating by plasma spray–physical vapor deposition (PS–PVD). The effects processing parameters during PS–PVD process microstructures deposited were investigated. A homogeneous with p...

The influence of polyvinylpyrrolidone (PVP), a commonly used binder and adhesive, on the aggregation of spheroids coated with hydroxypropylmethylcellulose (HPMC) was studied. The aggregation propensities of spheroids coated by HPMC alone and by HPMC with polyethylene glycol (PEG) were compared with those coated by HPMC with PVP and the viscosity of the coating solutions determined. The coating ...