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1 Journal of Achievements in Materials and Manufacturing Engineering

1 2012

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Application of HP-HT methodin the manufacture of NiAl phase

Hyjek P., Sulima I., Malczewski P., Jaworska L.

Journal of Achievements in Materials and Manufacturing Engineering

2012

Vol. 55, nr 2

700--705

Purpose: The aim of the study was to determine the effect of variable temperature and constant pressure to consolidate the powder mixture of nickel and aluminum in an amount to provide receipt of NiAl intermetallic phase. In particular, the influence of high pressure - high temperature (HP-HT) method to change the structure of sintered density, porosity, Young’s modulus and Vickers hardness. Design/methodology/approach: Using the parameters of the sintering pressure of 7±0.2 GPa and a temperature of 1300, 1400 and 1500°C formation during 60 s, using a HP-HT Bridgman, sintered intermetallic phase NiAl. Sinters were obtained X-ray qualitative analysis, as well as the physical properties of the selected set: the density and Young’s modulus. Strength properties of hardness were determined in an attempt to Vickers. Microstructural observations were performed on an optical and scanning microscope, EDS analysis was performed also received NiAl phases. Findings: Manufactured by HP-HT phase NiAl characterized by compact design with relatively low porosity. Microscopic observations and EDS analysis revealed the existence of a complex multi-phase structure, which also resulted from microhardness tests. It was found that the optimum properties have produced NiAl phase at the sintering temperature of about 1300°C. Research limitations/implications: Experimental confirmation of the possibility of producing sintered metal powder HP-HT method implies the desirability of extending research in the direction of increased property including through the addition of other elements or ceramic compounds, heat treatment processes, and also via a change in pressure - which is one of the main parameters of the sintering process. Practical implications: Sintered NiAl phases can be used as a matrix composites reinforced with ceramic particles. Composite based on intermetallic phase NiAl as a result of strengthening the ceramic particles should have correspondingly high strength properties at elevated temperatures, as well as resistance to oxidation and abrasion. Originality/value: Used for the manufacture of NiAl intermetallic phase sintering technology under high pressures (HP) and the temperatures (HT), which then parameters were well-chosen to get optimum usable properties (mechanical and physico-chemical properties). In addition, the studied process characterized the short time of consolidation of powders as well as the possibility to obtainment of assumed chemical composition.