scholarly journals Thermo-Mechanical Behaviour of HfO2 Coatings for Aerospace Applications

2008 ◽  
Vol 59 ◽  
pp. 87-91 ◽  
Author(s):  
K. Mergia ◽  
Volker Liedtke ◽  
T. Speliotis ◽  
G. Apostolopoulos ◽  
S. Messoloras
Keyword(s):  
High Temperature ◽  
Composite Materials ◽  
Magnetron Sputtering ◽  
Mechanical Behaviour ◽  
Ceramic Composite ◽  
Protective Layer ◽  
Radiation Frequency ◽  
Aerospace Applications ◽  
Ceramic Composite Materials ◽  
Very High

The use of ceramic composite materials in aerospace applications requires the development of oxidization protection coatings which can withstand very high temperatures. HfO2 is a promising material as a high temperature oxidization protective layer. HfO2 coatings have been deposited by radiation frequency magnetron sputtering all over the surface of SiC substrates and were tested under re-entry conditions. Also their oxidization resistance in air in the temperature range 1100 to 1450°C has been examined. The coatings were found to be stable and well-adhering to the substrate even after 100 re-entry cycles. No oxidization of the underlying SiC structure is observed. Re-entry and oxidization tests result in the formation of HfSiO4 at the HfO2/SiC interface, which further promotes their oxidization resistance.

scholarly journals High-temperature heat-shielding, ceramic and ceramic-metal composite materials for new-generation aviation equipment

2020 ◽  
pp. 83-92
Author(s):  
Yu. A. Balinova ◽  
D. V. Graschenkov ◽  
A. A. Shavnev ◽  
V. G. Babashov ◽  
A. S. Chaynikova ◽  
...  
Keyword(s):  
High Temperature ◽  
Composite Materials ◽  
Ceramic Composite ◽  
Metal Composite ◽  
Structural Elements ◽  
Temperature Heat ◽  
Metal Ceramic ◽  
Ceramic Composite Materials ◽  
Heat Shielding ◽  
New Generation

This paper describes achievements of the All-Russian Scientific Research Institute of Aviation Materials in the field of creating high-temperature heat-shielding, ceramic and metal-ceramic composite materials. The advantages and prospects of applying the developed materials in the manufacturing of structural elements of aircraft and friction joints are discussed. The synthesis features and basic properties of metal-ceramic composite materials based on light alloys, refractory metal matrices, ceramic composite materials for use in heavily loaded structural elements of modern aircraft are presented. The main achievements in the field of heat-shielding materials based on refractory oxide fibres are presented, along with their properties and application in new-generation aircrafts.

Life Prediction Based on Material State Changes in Ceramic Matrix Composite Materials

2007 ◽  
Author(s):  
Ken Reifsnider ◽  
S. W. Case
Keyword(s):  
High Temperature ◽  
Composite Materials ◽  
Gas Turbines ◽  
Ceramic Composite ◽  
Ceramic Matrix Composite ◽  
Ceramic Composites ◽  
Stress Strain ◽  
Material State ◽  
State Changes ◽  
Ceramic Composite Materials

Monolithic ceramics and continuous fiber reinforced ceramic composites are being developed for use in high temperature applications such as combustor liners in gas turbines, thrust deflectors for jet engines, and thruster nozzles. Ceramic composite materials possess the high temperature resistance properties of ceramics, but have better creep and cyclic properties. However, the properties of these materials change somewhat with time at service temperatures, i.e., their material state changes as a function of service conditions and history. The authors have developed a methodology for representing and combining the effects of high temperature material state changes in CMCs, along with changes in applied stress / strain conditions during service, to estimate remaining strength and life of ceramic composite materials and components. Fatigue, creep rupture, and time dependent deformation are combined by a strength metric in integral form to create a time-resolved, point-wise estimate of current remaining strength and life in material elements. Application of this methodology in discrete element representations of mechanical behavior of structural elements with nonuniform stress / strain states has been implemented.

Perspective high-temperature ceramic composite materials

2011 ◽  
Vol 81 (5) ◽  
pp. 986-991 ◽  
Author(s):  
E. N. Kablov ◽  
D. V. Grashchenkov ◽  
N. V. Isaeva ◽  
S. St. Solntsev
Keyword(s):  
High Temperature ◽  
Composite Materials ◽  
Ceramic Composite ◽  
Ceramic Composite Materials

TEM study of boron additions to cobalt aluminide

1988 ◽  
Vol 46 ◽  
pp. 546-547
Author(s):  
Gerald B. Feldewerth
Keyword(s):  
High Temperature ◽  
Turbine Engines ◽  
Major Drawback ◽  
University Of Missouri ◽  
Specific Strength ◽  
Aerospace Applications ◽  
Wide Range ◽  
Ordered Alloys ◽  
The University ◽  
Very High

In recent years an increasing emphasis has been placed on the study of high temperature intermetallic compounds for possible aerospace applications. One group of interest is the B2 aiuminides. This group of intermetaliics has a very high melting temperature, good high temperature, and excellent specific strength. These qualities make it a candidate for applications such as turbine engines. The B2 aiuminides exist over a wide range of compositions and also have a large solubility for third element substitutional additions, which may allow alloying additions to overcome their major drawback, their brittle nature.One B2 aluminide currently being studied is cobalt aluminide. Optical microscopy of CoAl alloys produced at the University of Missouri-Rolla showed a dramatic decrease in the grain size which affects the yield strength and flow stress of long range ordered alloys, and a change in the grain shape with the addition of 0.5 % boron.

Design and development of ring-on-ring jig for biaxial strength testing of brittle ceramic composite materials: ZrB2-30wt-%SiB6

2019 ◽  
Vol 118 (4) ◽  
pp. 159-168 ◽  
Author(s):  
Alejandro Carrasco-Pena ◽  
Ryan Jordan ◽  
Jessica Dieguez ◽  
Arturo Coronado-Rodríguez ◽  
Veli B. Ozdemir ◽  
...  
Keyword(s):  
Composite Materials ◽  
Ceramic Composite ◽  
Strength Testing ◽  
Design And Development ◽  
Ceramic Composite Materials
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