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Stopy intermetaliczne i spieki ciężkie jako nowe materiały

100%

Bojar Z. , Jackowski A. , Michałowski J. , Piętaszewski J. , Przetakiewicz W. , Włodarczyk E.

tom Z. 72

83-96

W referacie posumowano wyniki prac w zakresie technologii wytwarzania i przetwarzania stopów na osnowie faz międzymetalicznych, w szczególności z układów Ni-Al i Fe-Al oraz omówiono efekty związane z uplastycznieniem wybranych stopów. Zbadano wpływ rodzaju proszku żelaza, stopnia utlenienia proszku wolframu oraz rodzaju atmosfery spiekania na jakość spieków W-7%Ni-3%Fe. Oceniono wpływ obciążenia wybuchowego spieku na jego właściwości.

The results of investigations of Ni-Al and Fe-Al intermetallic alloys were summarised in this paper. Many different methods utilising plastic forming, heat treatment and thermomechanical tretment of castings as well hot pressing and sintering of powder materials and consolidation of layered structures or protective coatings were used to obtain new alloys on a base or with significant contents of intermetallic phases in the structure. The influence of sintering atmosphere, sort of iron powder and level of tungsten powder oxidation on selected properties of W-Ni-Fe sinters was investigated. The effect of explosive loading of sinters on their properties was described too.

The effect of casting porosities on cavitational erosion of intermetallic alloy FeAl36

86%

Jasionowski R. , Przetakiewicz W. , Zasada D.

2010

tom Vol. 10, iss. 3

175--178

The machinery and equipment elements operating in a turbulent fluid flow, are exposed to destruction as a result of the impact of the cavitation, corrosion and abrasion processes, among which are hardest to minimize the imploding cavitation bubbles. Repeated cavitation implosions of bubbles give rise to cracks, material loss, resulting in increased flow resistance and reduction of the efficiency of the device, or even its destruction. In order to prevent or mitigate the cavitation phenomenon and its harmful effects, two basic methods are applied. The first of these is the selection of geometrical parameters and hydraulic machinery and the relevant elements of the streamlined shape and flow channels. The second solution is the selection of engineering plastics with greater resistance to cavitation. In case of materials manufactured with the casting method, a very important role is being played by the quality of manufactured casting having the smallest number of casting defects. The aim of the present study was to examine the effect of casting porosities of an intermetallic alloy FeAl36 on cavitational erosion.