Corrosion of Ceramic Materials

Opila, Elizabeth J.; Jacobson, Nathan

doi:10.1002/9783527603978.mst0409

Cited by 3 publications

(2 citation statements)

References 167 publications

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“…The fact that oxidation rate is higher under wet environment in comparison with dry environment (Figure 2c, green and orange curves), results from the ability of OH − to diffuse more efficiently through the already-grown oxide layer than the O 2− [57]. The difference in diffusion rate is also accentuated by the porosity of the oxide layer form under wet environment, due to the formation of nitrogen and hydrogen during the oxidation reaction [57,60].…”

Section: Ga 2 O 3 -Shell Thickness Evolution and Formationmentioning

confidence: 96%

GaN/Ga2O3 Core/Shell Nanowires Growth: Towards High Response Gas Sensors

et al. 2019

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The development of sensors working in a large range of temperature is of crucial importance in areas such as monitoring of industrial processes or personal tracking using smart objects. Devices integrating GaN/Ga2O3 core/shell nanowires (NWs) are a promising solution for monitoring carbon monoxide (CO). Because the performances of sensors primarily depend on the material properties composing the active layer of the device, it is essential to control them and achieve material synthesis in the first time. In this work, we investigate the synthesis of GaN/Ga2O3 core-shell NWs with a special focus on the formation of the shell. The GaN NWs grown by plasma-assisted molecular beam epitaxy, are post-treated following thermal oxidation to form a Ga2O3-shell surrounding the GaN-core. We establish that the shell thickness can be modulated from 1 to 14 nm by changing the oxidation conditions and follows classical oxidation process: A first rapid oxide-shell growth, followed by a reduced but continuous oxide growth. We also discuss the impact of the atmosphere on the oxidation growth rate. By combining XRD-STEM and EDX analyses, we demonstrate that the oxide-shell is crystalline, presents the β-Ga2O3 phase, and is synthesized in an epitaxial relationship with the GaN-core.

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Section: Ga 2 O 3 -Shell Thickness Evolution and Formationmentioning

confidence: 96%

GaN/Ga2O3 Core/Shell Nanowires Growth: Towards High Response Gas Sensors

et al. 2019

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“…Furthermore, the hierarchical structure of nonoxide CMCs (especially SiC-based CMCs) is designed to also resist in degrading environments (e.g. O2, H2O vapour, hydrocarbon or impurities such as Na + ) [25]. Nevertheless, if its protecting surface layers fail, the internal structure can suffer an accelerated degradation leading to a brittle and catastrophic failure of the component [26].…”

Section: Surface Integritymentioning

confidence: 99%

The new challenges of machining Ceramic Matrix Composites (CMCs): Review of surface integrity

Gavaldà-Diaz

Luna

Liao

et al. 2019

International Journal of Machine Tools and Manufacture

199

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Ceramic Matrix Composites (CMCs) are currently an increasing material choice for several high value and safety-critical components, fact that has recently originated the need of understanding the effect of several machining processes. Due to the complex nature of CMCs -i.e. heterogeneous structure, anisotropic thermal and mechanical behaviour and generally the hard nature of at least one of the constituents (e.g. fibre or matrix)machining become extremely challenging as the process can yield high mechanical and thermal loads. Furthermore, the orthotropic, brittle and heterogeneous nature of CMCs result in different material removal mechanisms which lead to unique surface defects. Hence, this review paper attempts to provide an informative literature survey of the research done in the field of conventional and non-conventional machining of CMCs with a main focus on critically evaluate how different machining techniques affect the machined surfaces. This is achieved by exploring and recollecting the different material characterisation techniques currently used to observe and quantify the mechanical and thermal surface and subsurface damages and highlight their governing removal mechanisms.

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