Zirconia ceramics (review)

Vityaz, P. A.; Ermolenko, I. N.; Fedorova, I. L.; Ulyanova, T. M.

doi:10.1007/bf00793880

Cited by 3 publications

(3 citation statements)

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“…The addition of hydrochloric acid to 0.2 OH 0 , that is, M ZrOCl 2 helped to produce smaller final particle sizes; however, slower particle formation and growth kinetics resulted. In summary, there seems to be a competitive effect CO(NH 2 ) 2 / 3H 2 O r CO 2 / 2NH / 4 / 2OH 0 (pHF) [5] between the ZrOCl 2 concentration and the acidity of the ZrOCl 2 / H 2 O r ZrO 2 (s) / 2HCl (pHf).…”

Section: Resultsmentioning

confidence: 94%

“…mance of other materials (such as alumina and mullite, as well as nonoxide ceramic matrices, SiC and Si 3 N 4 ) could The significance of the production of monodispersed col-be dramatically enhanced by inclusion of zirconia in the loidal particles (i.e., ultrafine powders that are uniform in form of nanoparticles (5). The metastable tetragonal and grain size, shape, and composition) can never be overempha-monoclinic phases of zirconia play a significant role as hardsized.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Nucleation and Growth for Synthesis of Nanometric Zirconia Particles by Forced Hydrolysis

Harris

Byers

1998

Journal of Colloid and Interface Science

116

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Section: Resultsmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Nucleation and Growth for Synthesis of Nanometric Zirconia Particles by Forced Hydrolysis

Harris

Byers

1998

Journal of Colloid and Interface Science

116

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“…Scientists and engineers have an exceptional interest in zirconia because of its unique and excellent properties: high refractoriness and corrosion resistance, mechanical strength, fracture toughness and some more [12]. The mechanical properties of zirconia is a function of phase structure and composition.…”

Section: Powdermentioning

confidence: 99%

Plasma spray deposition on surfaces with curvature

Ba¹

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Plasma spraying has been widely used to apply coatings on complex engineering components due to its high deposition rate and wide choice of materials. However, the complexity of the components shape leads to the deficiency of the plasma spraying process. In addition, the coating profile continues to change, which will affect the subsequent spraying. Hitherto, the desired coating profiles need to be optimized, mostly by costly and extensive trial and error tests done by highly-trained manpower. A deposition model thus is desirable to predict the continuously changing profiles on complex surfaces. By this means, the cost and effort of the spraying test will be reduced significantly. Curved surface or even more complex component surface can be considered to comprise of multiple flat surfaces. A semi-empirical methodology to predict the deposit formation on curved substrates has been developed in this thesis. The methodology is developed by three vital steps: • Computational fluid dynamics (CFD) analysis to obtain the spatial distribution of particles and their corresponding in-flight parameters. • Droplet splatting behavior analysis to establish correlations for spread factor, aspect ratio and elongation factor with respect to the impact velocity and impact angle. • Modeling of deposit growth with time, with the data acquired in the particles parameters simulation and the correlations for splat morphologies. In the CFD analysis using FLUENT V6.03©, the spraying process is modeled as a three-dimensional steady state plasma plume by the volumetric heating of the arc gas in the torch. Solutions of the plasma flow velocity and temperature fields are firstly obtained. Particles are introduced into and interact with the plasma flow by a one-way coupling method. The heat and momentum equations are solved Abstract II to obtain the spatial distributions of the particles and their corresponding in-flight parameters, including velocity, temperature, size and mass flow rate. SprayWatch© on-line diagnostics system is used to measure the particles velocity and flight angle for the freestream case (with no substrate inclusion). The simulated results captured by a plane at the distance 80 mm agree well with the SprayWatch© measurements. The particle parameters from simulation are used in the deposition code, while the SprayWatch© measurements are used for selection of droplet parameters in the simulation of droplet splatting behavior. The effect of substrate inclusion and shape on the particle in-flight behavior is also investigated. It is found that the substrate inclusion and shape (concave or convex) significantly influence the plasma flow fields in the vicinity of the substrate The particles parameters remain relatively unaffected if their size is larger than a threshold value (10 m). The analysis of droplet splatting behavior is divided into two aspects: • A droplet impacts onto the flat substrate under normal impact. • A droplet impacts onto the curved substrate at different impact angles. Individual splats are captured by th...

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