Objective
1. To obtain at laboratory and at pilot level close to theoretical density Mullite, Mullite-Zirconia, Mullite-Zirconia-Alumina and Mullite- Zirconia-Titania(ss) reaction sintered composites. 2. To determine the room and high-temperature mechanical properties-o~f, KIC, slow crack growth and thermal shock-of the selected composites. 3. To study the relationship between high-temperature mechanical properties and microstructure of the selected composites in order to evaluate these materials as candidates for structural parts in adiabatic engines.
The objectives of this project are as follows:
to obtain at laboratory level and at pilot level close to theoretical density mullite, mullite zirconia, mullite zirconia alumina and mullite zirconia titania(ss) reaction sinteredcomposites;
to determine the room temperature and high temperature mechanical properties (o-f KIC, slow crack growth and thermal shock) of the selected composites;
to study the relationship between high temperature mechanical properties and microstructure of the selected composites in order to evaluate these materials as candidates for structural parts in adiabatic engines.
Mullite and zirconia doped mullite as well as mullite zirconia, mullite zirconia alumina and mullite zirconia titania reaction sintered composites close to theoretical density (greater than or equal to 98%) were obtained at laboratory level and at pilot plant level. The effect of a small amount of alkaline impurities on the zircon+alumina reaction sintered process, microstructure and room and high temperature mechanical properties were established. The o-f (280 to 350 MPa) and KIC (2.5 to 5.5 MPa m{-0.5} values were kept almost constant up to 1300 C in all compositions studied.
In the particular case of zirconia doped mullite (0.6 weight %) a drastic increase in the o-f value (approximately 2.5 times) was obtained at 1200 C after 8h annealing at 1500 C without any change in the creep rate value (approximately 10{-9}S{-1}.
THE REACTION SINTERED MULLITE-ZRO2 MATERIALS ARE STRONG CANDIDATES FOR STRUCTURAL ENGINE APPLICATIONS DUE TO THE GOOD HIGH TEMPERATURE MECHANICAL PROPERTIES OF THE MULLITE MATRIX, THEIR GOOD THERMAL SHOCK RESISTANCE, THEIR GOOD CHEMICAL STABILITY AND THEIR LOW DENSITY.
DIFFERENT PHASE COMPOSITIONS OF MULLITE, ZIRCONIA AND ALUMINA WILL BE PROCESSED AT LABORATORY AND PILOT-PLANT LEVEL IN ORDER TO PRODUCE GROGS AND DENSE SAMPLES FOR HIGH TEMPERATURE MECHANICAL TESTS. FINE POWDERS WILL BE PRODUCED FROM THE GROGS BY DIFFERENT MILLING ROUTES. AFTER CHEMICO-PHYSICAL CHARACTERISATION OF THE POWDERS AND DETERMINATION OF THEIR SINTERING BEHAVIOUR A SERIES OF SAMPLES WILL BE PREPARED BY DIRECT REACTION SINTERING. MICROSTRUCTURAL AND ROOM TEMPERATURE MECHANICAL PROPERTIES OF THESE SAMPLES WILL BE PERFORMED. THE STUDY OF THE FOLLOWING HIGH TEMPERATURE MECHANICAL PARAMETERS IS FORESEEN : FRACTURE STRENGHT, FRACTURE TOUGHNESS, YOUNG'S MODULUS, CRACK GROWTH RESISTANCE, SLOW CRACK GROWTH, THERMAL SHOCK BEHAVIOUR, THERMAL FATIGUE BEHAVIOUR.
THE APPLICATION OF CERAMICS TO ENGINES HAS AN ENORMOUS COMMERCIAL POTENTIAL. EVERY ENGINE TECHNOLOGY FROM TRANSPORTATION VEHICLES TO STATIONARY POWER GENERATORS WILL BE AFFECTED. ENGINES AND TURBINES USING CERAMIC TECHNOLOGY WILL BE ABLE TO OFFER HIGHER FUEL EFFICIENCY COMBINED WITH REDUCED EMISSIONS. HEAT EXCHANGERS, RECUPERATORS, ARE EXPECTED TO BENEFIT IN A SIMILAR WAY FROM THE APPLICATION OF CERAMICS TECHNOLOGY.
Fields of science (EuroSciVoc)
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
- engineering and technology materials engineering composites
- engineering and technology environmental engineering energy and fuels
- engineering and technology materials engineering ceramics
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Coordinator
24500 ARGANDA DEL REY (MADRID)
Spain
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