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2010
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tom Nr 12
241-246
PL
W pracy przedstawiono wyniki badań zmęczeniowych dla kompozytów na osnowie poliamidu z napełniaczem mineralnym tuf, dodanego w ilości wagowej 10, 15, 25%. Wyznaczenie standar-wej charakterystyki zmęczeniowej w postaci wykresu Wöhlera jest długotrwałe, czasochłonne raz bardzo kosztowne stąd też została zaproponowana nowa, zmodyfikowana metoda badań Oparta na metodzie Lehra stosowanej przy badaniach metali. Przeprowadzone badania potwierdziły możliwość wykorzystania tej metody do wyznaczania wytrzymałości zmęczeniowej kompozytów poliamidowych
EN
In this work the results of investigations fatigue test for composites base on PA6 with differ addition powder of tuff were presented. The long-term loading is expensive, difficult to perfo and long-lasting. That's why a simpler and cheaper method is highly desirable. The presen' method of evaluation the short - test strength are Lehr method.
2
Content available remote Structure of metal matrix composites with an addition of tuff
100%
EN
The article presents preliminary results of tests of metal matrix composites structure which was modified by an addition of powdered volcanic tuff. Distribution and shape of ceramic particles as well as the quality of the bonding along the tuff- metal matrix interface were studied. Depth of tuff element diffusion in the matrix as well as diffusion in tuff particles were checked. Micro-hardness and porosity of the composites were also tested. The tuff from Filipowice near the town of Krzeszowice was used for the tests. Powder metallurgy was applied to obtain the composites and the matrix materials were copper and 316L steel powders. The tuff was introduced in 2, 5 and 10 % by weight. To remove water from the channels of aluminosilicates, the tuff was baked at 850oC for 4 hours and then cooled together with the oven. The tests revealed good quality of the bonding of the tuff particles and the matrix and their even distribution. The addition of tuff improved the hardness of the composites and reduced their porosity which has great significance because of possible applications of this kind of materials in general and copper composites in particular. This gives grounds for further studies on volcanic tuff use in metal composites.
PL
Przedmiotem niniejszej pracy było określenie wpływu napełniacza mineralnego tuf na właściwości kompozytów termoplastycznych. Wytworzono kompozyty na osnowie poliamidu, polipropylenu i polietylenu zawierające 10, 15, 25%wag. napełniacza tuf. Przedstawiono rezultaty badań właściwości wytrzymałościowych, wskaźnik mięknienia Vicata oraz wskaźnika szybkości płynięcia. We wnioskach stwierdzono, że kompozyty te cechuje wyższa sztywność, twardość powierzchni oraz wysoki wskaźnik płynięcia, co umożliwia wtrysk wyrobów o skomplikowanych kształtach. Oprócz tego podnoszą one swoją odporność temperaturową i ograniczają kurczliwość.
EN
In this paper the influence of tuff on the mechanical properties, Vicat softening temperatures and melt flow index for composites based on different polymeric matrix have been presented. First results of investigations of mechanical properties of polymer composites with mineral tuff are very promising. Composites based on PA6, PP and HDPE with different addition of tuff powder are characterized with good ability of dissipation of energy, increased stiffness and good melt flow index. The low price of making tuff powder enable to use this filler to modify such polymers as polyamide and polyolefin's in the future. In these materials tuff can replace glass fiber and other mineral filler increasing stiffness.
4
100%
EN
Possibilities of reusing and developing of waste plastics are one of the main problems of waste management for municipal government especially in the context of adapting Polish law to standards of EC [1]. During the last 10 years total amount of plastics waste increased twice, especially in communal agglomerations. Among communal waste plastics make up 7 to 14% of whole their mass and 30% of their volume [1,2]. Plastic products have been recycled to be used in a number of different products often different from their original use. Reclaimed plastics can’t be used as products which have contact with food or as high demands esthetic and hygienic products, they also shouldn’t be applied as short-time used products because they quickly come back to plastics store-place. Reclaimed plastics have lower properties than virgin plastics – mainly the strength falls with the simultaneous fall of modules and increase fragile especially for PP, PE, PS and PET [1]. One of the possibilities of reinforcement of polyolefines is adding diverse fillers like glass or carbon fibers (but they are rather expensive) and natural fillers like mineral, wood and others [3]. It’s especially important for wasted of low density polyethylene which has low modulus. For the tests it was used waste polyethylene (LDPE and HDPE) from industrial with 15% mineral fillers – tuff. For the tests it was prepared two kinds of composites materials with 15% of tuff powder. Besides for comparison it was tested recycled polyethylene (HDPE and LDPE) and next was tested specimens cut out from produced europallets (with 15% of tuff). It was tested mechanical properties all prepared composite materials like tensile strength, stress and bending e-modulus and processing properties like melt flow, Vicat point and photos on SEM microscope.
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