Journal ArticleDOI
Surface Engineering of Mo-Base Alloys for Elevated-Temperature Environmental Resistance
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TLDR
In this paper, the fundamental concepts of reactive diffusion pathway analysis and kinetic biasing are used to design a multilayer Mo-Si-B-base coating with a phase sequencing that allows for structural and thermodynamic compatibility and an underlying diffusion barrier to maintain coating integrity.Abstract:
The synthesis of robust coatings that provide protection against environmental attack at ultrahigh temperatures is a difficult challenge. To achieve this goal for Mo-base alloys, the fundamental concepts of reactive diffusion pathway analysis and kinetic biasing are used to design a multilayer Mo-Si-B-base coating with a phase sequencing that allows for structural and thermodynamic compatibility and an underlying diffusion barrier to maintain coating integrity. The coating design concepts have a general applicability. The coating structure evolution during high-temperature exposure facilitates a prolonged lifetime as well as self-healing capability. The borosilicide coatings that can be synthesized by a pack cementation process yield superior environmental resistance for Mo-base systems at temperatures up to at least 1,700°C and can be adapted to apply to other refractory metal and ceramic systems.read more
Citations
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Journal ArticleDOI
Alloy design for aircraft engines
TL;DR: This research presents a new generation of metallic materials that are fundamental to advanced aircraft engines and their applications are expanding the scope for discovery and implementation for future generations of advanced propulsion systems.
Journal ArticleDOI
Effect of filler on the oxidation protective ability of MoSi2 coating for Mo substrate by halide activated pack cementation
TL;DR: In this paper, the effect of filler cases, such as Al2O3, SiO2 and SiC, on the microstructure and oxidation resistance of MoSi2 coating was studied.
Journal ArticleDOI
Sustainability through alloy design: Challenges and opportunities
Jaclyn Leigh Cann,Anthony De Luca,David C. Dunand,David Dye,Daniel B. Miracle,Hyun Seok Oh,Elsa Olivetti,Tresa M. Pollock,Warren J. Poole,Rui Yang,Cemal Cem Tasan +10 more
TL;DR: In this paper, the authors discuss the most urgent sustainability challenges that can be addressed with alloy design, to help orchestrate the increasing interest in metallurgical research to focus on these most critical challenges.
Journal ArticleDOI
Environmentally Resistant Mo-Si-B-Based Coatings
TL;DR: In this paper, a spray deposition of Mo followed by a chemical vapor deposition of Si and B by pack cementation is used to develop an aluminoborosilica surface.
Journal ArticleDOI
Effect of thermodynamically metastable components on mechanical and oxidation properties of the thermal-sprayed MoSi2 based composite coating
TL;DR: In this article, thermodynamically metastable components in plasma-sprayed MoSi2 based composite coatings were comparatively investigated to reveal their impacts on mechanical performance and oxidation behavior of the free-standing coatings.
References
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Journal ArticleDOI
Thermal Barrier Coatings for Gas-Turbine Engine Applications
TL;DR: In this article, the structure, properties, and failure mechanisms of thermal barrier coatings (TBCs) are reviewed, together with a discussion of current limitations and future opportunities.
MonographDOI
Introduction to the high-temperature oxidation of metals
TL;DR: In this article, the authors present a solution to Fick's second law for a semi-infinite solid and a rigorous derivation of the kinetics of internal oxidation, as well as the effects of impurities on oxide defect structure.
Journal ArticleDOI
Materials selection guidelines for low thermal conductivity thermal barrier coatings
TL;DR: In this paper, the minimum thermal conductivity of yttria-stabilized zirconia for high-temperature barrier coatings was investigated and a materials parameter was developed that can be used to identify candidate alternatives for high temperature applications.
Book
Introduction to high temperature oxidation of metals
Neil Birks,Gerald H. Meier +1 more
TL;DR: In this paper, the authors introduce high temperature oxidation of metals, and introduce the concept of high temperature oxidization of metals and its application in the field of high-temperature computer vision.
Journal ArticleDOI
Corrosion of Silicon-Based Ceramics in Combustion Environments
TL;DR: In this paper, the processes of passive oxidation, deposit-induced corrosion, active oxidation, scale/substance interactions, and scale volatility are studied in the case of high-purity SiC and Si3N4 in pure oxygen, giving attention to such secondary elements in the ceramics as water and CO2 oxidants, combustion environment impurities, and thermal cycling.