1,721,003 research outputs found
Morphological, compositional an microstructural characterization of solid residues from incineration of municipal sewage sludge
No full textImproving lateral resolution of SEM/EDS observation by the use of advanced TEM sample preparation techniques in the characterisation of nanostructured coatings
No full textMANUFACTURE AND CHARACTERIZATION OF CONTINUOUS SIC FIBER REINFORCED ALUMINUM COMPOSITES BY LOW-PRESSURE PLASMA SPRAYING
No full textTHE FEASIBILITY OF THE LOW PRESSURE PLASMA SPRAYING (LPPS) PROCESS FOR PRODUCING CONTINUOUS FIBER REINFORCED METAL MATRIX COMPOSITES IS EVALUATED ON A LABORATORY SCALE. THE REINFORCEMENT USED WAS 140 MICRON DIAMETER SIC/C LONG FIBERS, WHILE ALUMINIUM WAS DEPOSITED AS MATRIX MATERIAL. RESULTS OF PRELIMINARY CHARACTERIZATION TESTS ARE PRESENTED, IN ORDER TO EVALUATE THE OVERALL QUALITY OF THE COMPOSITE. SCANNING ELECTRON MICROSCOPY, ENERGY DISPERSIVE SPECTROSCOPY, X-RAY DIFFRACTION ANALYSIS AND ROOM TEMPERATURE TENSILE TESTS WERE CARRIED OUT ON SPRAYED COMPOSITE MONOTAPES. THE LONG RAGE DIFFUSION OF CHEMICAL REACTIONS PRODUCTS IN THE INTERFACIAL ZONE WAS INVESTIGATED, AFFECTING MECHANICAL PROPERTIES OF THE COMPOSITE, WITH SPECIAL REFERENCE TO ULTIMATE TENSILE STRENGTH AND STRAIN. PLASMA SPRAYING FABRICATION METHOD SEEMS PROMISING IN REDUCING COST AND IMPROVING QUALITY OF THE FINAL PRODUCTS. THE WIDESPREAD APPLICATION OF LPPS AS A PRODUCTION TECHNIQUE FOR MMCS CAN BE ANTICIPATED. NEVERTHELESS FURTHER RESEARCH AND DEVELOPMENT ACTIVITIES ARE REQUIRED TO REVEAL AND TO REALIZE THE TRUE POTENTIAL OF THESE MATERIALS
Hot pressing of plasma sprayed SiC fiber reinforced Ti-6Al-4V alloy
No full textAdvanced titanium alloy metal matrix composites offer significant mechanical improvements over many conventional materials. In order to minimize fiber-matrix chemical reactions due to high temperatures involved in the fabrication methods, the final component can be obtained using two different steps: (1) fabrication of preforms (monotapes) by inert plasma spraying and (2) hot pressing of the fabricated preforms. Continuous SiC fiber-reinforced Ti-6Al-4V preforms were hot pressed to fabricate a composite multilayer. Different values of hot pressing processing parameters (temperature, applied load, bonding time) were investigated on the basis of a two-level factorial design. Metallographic and scanning electron microscopy (SEM) analyses were carried out to evaluate the bonding degree of the fabricated preforms. Preliminary three-point bending tests were also performed to understand the mechanical behavior and to show the more suitable values of the processing parameters for a hot pressing procedure. These values should be in the range of 830 to 950 degrees C (temperature), 80 MPa (applied stress), 20 to 30 min bonding time to avoid undesired phase transformation, large plastic flow of the metal matrix, and detrimental chemical reaction at fiber-matrix interface
Influenza del rapporto alcali/SO3 del clinker sul fenomeno di presa dei cementi Portland
No full textProduzione di film di diamante e simili al diamante attraverso processi di deposizione a bassa pressione: stato della ricerca
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Characterization and wear properties of a nanoscaled CrN/NbN multilayer coating obtained by non conventional reactive PVD
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