Intermetallic TiAl-based matrix composites: Investigation of the chemical and mechanical compatibility of a protective coating adapted to an alumina fibre

2000 ◽  
Vol 48 (20) ◽  
pp. 4763-4774 ◽  
Author(s):  
A. Brunet ◽  
R. Valle ◽  
A. Vassel
Keyword(s):  
Protective Coating ◽  
Matrix Composites ◽  
Alumina Fibre ◽  
Mechanical Compatibility

Development and Test of Oxide/Oxide CMC Combustor Liner Demonstrators for Aero Engines

2016 ◽  
Author(s):  
Thomas Behrendt ◽  
Stefan Hackemann ◽  
Peter Mechnich ◽  
Yuan Shi ◽  
Sandrine Hönig ◽  
...  
Keyword(s):  
Protective Coating ◽  
Mechanical Design ◽  
Early Stage ◽  
Ceramic Matrix Composites ◽  
Matrix Composites ◽  
Failure Model ◽  
Design Development ◽  
Post Test ◽  
Aero Engines ◽  
Combustor Liner

Ceramic matrix composites (CMC) offer the potential of increased service temperatures and are thus an interesting alternative to conventional combustor alloys. Tubular combustor liner demonstrators made of an oxide/oxide CMC were developed for a lean combustor in a future aero-engine in the medium thrust range and tested at engine conditions. During the design various aspects like protective coating, thermo-mechanical design, development of a failure model for the CMC as well as design and test of an attachment system were taken into account. The tests of the two liners were conducted at conditions up to 80% take-off. A new protective coating was tested successfully with a coating thickness of up to t=1 mm. Different inspection criteria were derived in order to detect crack initiation at an early stage for a validation of the failure model. With the help of detailed pre- and post-test computer tomography scans to account for the micro structure of the CMC the findings of the failure model were in reasonable agreement with the test results.

Hydroxyapatite Matrix Composites by Hot Isostatic Pressing: Part 1. Alumina Fibre Reinforced

2012 ◽  
Vol 15 ◽  
pp. 73-83 ◽  
Author(s):  
N. Ehsani ◽  
A.J. Ruys ◽  
C.C. Sorrell
Keyword(s):  
Fracture Toughness ◽  
Hot Isostatic Pressing ◽  
Decomposition Temperature ◽  
Pressureless Sintering ◽  
Matrix Composites ◽  
Natural Bone ◽  
Alumina Fibre ◽  
Al2o3 Fibre ◽  
Toughness Improvement

Fracture Toughness Improvement of the Hydroxyapatite Matrix Composite, to a Level Comparable to that of Natural Bone for in Vivo Applications, Was the Aim of the Present Work. Hot Isostatic Press Using a Graphite/stainless Steel Encapsulation System Enabled the Production of Fully Dense Decomposition-Free Hap with Toughness Improvements of: 2.4 Times (Al2O3 Fibres, Optimally 20 Vol%). Glass Encapsulation of Fibre-Reinforced Hap Resulted in Aeration from Sample Volatilization. Further, it Was Found that the Hap Decomposition Temperature Was Higher at 100 Mpa (the Hiping Pressure) than for Pressureless Sintering. the Toughening Effect of the Al2o3 Fibre Additive Induced Plastic Deformation and Ductile Fracture.

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