Analysed was the surface of aluminides after inon nitriding in pulsed plasma. Analyses showed that on the surface of Ni- and Ti-aluminide existed aluminium nitride but no evidence of titatinum nitride was found on the surface of Ti-aluminide at given experimental conditions. Investigation is important for determination of proper conditions for ion nitriding. At Ti-aluminide inon nitriding should be at higher temperature compared to ion nitriding of Ni-aluminide. Investigations of aluminides are important for new cutting tools for metals where no presence of iron is allowed.
COBISS.SI-ID: 407978
For comparison of layers, formed in different atmospheres, three analysing methods were applied. Analyses revealed that most suitable oxide layer was formed during annealing on air. This is important for the producer of heaters.
COBISS.SI-ID: 602026
The simulation model considers the exact geometry of the furnace enclosure and the geometry of slabs. A view-factor matrix of the furnace enclosure was determined using the Monte Carlo method. The heat exchange was calculated using a three-temperature model. The heat conduction in was calculated using the 3D finite-difference method. The model was validated during the reheating process in the furnace. Developed model enables the application on production line, improves the reheating process of slabs, improves the yield of energy and reduces the emmission of gren house gasses.
COBISS.SI-ID: 623018
Investigations revealed that MoS2 improves the compressibility of powders and sinterability of poders mixtures, because of reaction with metal matrix and accelerating of condensing during sintering. Dispersion of thin complexe sulphides (Cr,V,Fe)S, improves the workability. A part of Mo was bound into complexe carbides of type M6C, that secure to held high hardness of the matrix. In synthesised composite was first time revealed the mutual coecistence of complexe carbides and sulphides. The new composite was synthesised with good lubrication and mechanical properties.
COBISS.SI-ID: 422058
Determination of orientation relationships between TiC particles and the surrounding aluminium matrix using transmission electron microscopy was the main objective. The melt of the commercial-purity aluminium and the commercial grain refiner AlTi3C0.15 were used to prepare experimental samples. The investigation showed that the {111} planes of TiC and aluminium were parallel what indicates the epitaxial nucleation of aluminium on {111} planes of TiC. Investigation is important for the producers, because AlTi3C0.15 is effective grain refiner that influences on better mechanical properties.
COBISS.SI-ID: 636586