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I. Sulima, L. Jaworska and P. Figiel

Abstract

In this paper the properties of the austenitic stainless steel reinforced with various volume fractions of TiB2 ceramics have been studied. The high pressure- high temperature (HP-HT) method of sintering was applied to the formation of composites. Samples were sintered at pressure of 5 and 7 ±0.2 GPa and temperatures of 1273 K and 1573 K. For the tested materials, the relative density, Young’s modulus and hardness were measured. In order to investigate the structure changes, the scanning electron microscope was used. The obtained results show that the temperature and pressure influence on the mechanical and physical properties of the investigated composites.

Open access

P. Hyjek, I. Sulima and L. Jaworska

Abstract

The article presents the results of tests carried out on the manufactured composite materials based on a two-phase NiAl/Ni3Al matrix, which was enriched with the addition of TiB2 ceramic particles added in an amount of 4 and 7 vol%. The resulting mixtures were sintered by the High Pressure High Temperature (HP-HT) process. The results were compared to the results obtained for the sole matrix material produced under the same conditions. It has been shown that, at a lower density, the addition of reinforcing particles increases the composite hardness, Young’s modulus and resistance to frictional wear. However, higher addition of TiB2 (7 vol%) was observed to yield less satisfactory results, and despite higher hardness and lower density caused a decrease in other properties tested. The produced materials were characterized by a compact and highly differentiated microstructure free from any noticeable cracks and pores.

Open access

A. J. Dolata, M. Dyzia, L. Jaworska and P. Putyra

Abstract

The main purpose of the investigations was to develop the phase composition of the composite assuming that the component selection criterion will be the formability of piston work surfaces during the machining. Wear resistance under the friction conditions was assumed as the additional parameter for the assessment of composite material. In the study were used AlSi7Mg/SiC+Cg and AlSi7Mg/SiC+GR hybrid composites prepared by the stir casting method.

Open access

I. Sulima, L. Jaworska and J. Karwan-Baczewska

In the work, the effect the boron addition on the microstructure and properties of the composites with austenitic steel of matrix was investigated. The composites were consolidated using the high pressure-high temperature (HP-HT) method. Two composite types were fabricated, i.e. steel with 8 vol.% TiB2 and steel with 8 vol.% TiB2 and 1 vol.% boron. Density of sintered materials was measured according to the Archimedes principle. Mechanical properties were determined by Vickers microhardness and compression test. The wear resistance was investigeted using ball-on-disc method. The microstructure of composites was analyzed using a scanning electron microscope.

The results show that the boron addition and sintering parameters have influence on the mechanical and tribological properties of the composites. Materials are characterized by very high density. The composites with boron exhibited higher Young’s modulus and microhardness in comparison with the properties of composites without boron addition.