Tailoring protective coatings for all-oxide ceramic matrix composites in high temperature-/high heat flux environments and corrosive media

2007 ◽  
Vol 38 (9) ◽  
pp. 690-697 ◽  
Author(s):  
W. Braue ◽  
P. Mechnich
Keyword(s):  
Heat Flux ◽  
High Temperature ◽  
Protective Coatings ◽  
Ceramic Matrix Composites ◽  
Ceramic Matrix ◽  
High Heat ◽  
High Heat Flux ◽  
Oxide Ceramic ◽  
Matrix Composites ◽  
Corrosive Media

A Study of Bridged Delaminations in High Temperature Laminates Under Heat Flux Loading

Materials ◽  
2003 ◽  
Author(s):  
Thomas Siegmund ◽  
Ashwin Hattiangadi
Keyword(s):  
Heat Flux ◽  
High Temperature ◽  
Thermal Loading ◽  
Significant Contribution ◽  
Thermal Protection ◽  
Ceramic Matrix Composites ◽  
Ceramic Matrix ◽  
High Heat ◽  
Heat Fluxes ◽  
Matrix Composites

High temperature ceramic matrix composites (CMCs) are material considered in many applications where high heat fluxes constitute a significant contribution to loading. The laminates can fulfill their function as thermal protection layers only if they stay intact, i.e. without internal delaminations or spalling, such that the heat flux remains undisturbed by such events. Crack bridging is an important effect in CMCs, and its implication to CMC laminates under thermal loading is investigated.

Current Status of Oxide Fibre-Reinforced Oxide Ceramic Matrix Composites for Gas Turbine Applications

2010 ◽  
Vol 434-435 ◽  
pp. 1-4
Author(s):  
Cengiz Kaya
Keyword(s):  
High Temperature ◽  
Gas Turbine ◽  
Ceramic Matrix Composites ◽  
Composite Plates ◽  
Ceramic Matrix ◽  
Thermomechanical Properties ◽  
Current Status ◽  
Oxide Ceramic ◽  
Matrix Composites ◽  
Recent Developments

Recent developments in the processing, understanding and mechanical/thermomechanical properties of oxide fibre reinforced oxide ceramic matrix composites for high temperature applications are reported. Two dimensional composite plates and uni-directional tubular composite (so called mini-composite) specimens are successfully manufactured and their microstructure, matrix/ fiber interface as well as mechanical properties are examined. It is shown that the microstructural variations, such as porosity size and interface between fibre and matrix determine the fracture behaviour and high temperature performance of the composites. The optimised components produced are considered to be suitable for gas turbine applications.

Processing and Characterization of Ultra-High Temperature Oxide Fiber-Reinforced Oxide Ceramic Matrix Composites with Improved Thermomechanical Properties

2008 ◽  
Vol 368-372 ◽  
pp. 1778-1781 ◽  
Author(s):  
Cengiz Kaya ◽  
Figen Kaya
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Ceramic Matrix Composites ◽  
Composite Plates ◽  
Ceramic Matrix ◽  
Matrix Cracking ◽  
Oxide Ceramic ◽  
Matrix Composites ◽  
Mullite Ceramic ◽  
Pressure Infiltration

A combined technique comprising electrophoretic deposition (EPD) and low-pressure infiltration was used for the fabrication of multi-layer woven mullite ceramic fabric reinforced alumina ceramic matrix composites (CMCs) for high temperature applications. Two different interface materials, NdPO4 and ZrO2 were synthesised and used for coating the woven ceramic fibres by EPD. The manufactured CMC components with suitable interface material are targeted for use at 1300-1400 oC in an oxidising atmosphere and have shown very good mechanical properties in multi-layer plate forms. Damage mechanisms, such as debonding, fibre fracture, delamination and matrix cracking within the composite plates subjected to flexural loading are analysed. It is shown that the composites with NdPO4 interface and 40 vol.% fibre loading have better mechanical properties in terms of strength and damage-tolerant behaviour. The final components produced are considered to be suitable for use as shroud seals and insulating layers for combustor chambers in aircraft engines.

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