Composites on the basis sulfuric polimer with reinforcement skeleton AlSi
Mirosław Cholewa, Maria Dziuba-Kałuża
Quarterly No. 1, 2009 pages 73-77
DOI:
keywords: composite, skeleton casting, strenght testing
abstract In article metod of manufacturing composite elements was shown. The composite elements was constructed with closed skeleton casting and polymer - ceramic filler. AlSi alloys with antimony were used for manufacturing the closed skeleton castings. Polymer warp SULCEM® and seediness mineral filler were created polymer, sulfuric concrete SULBET®. Sulfuric concrete, which was filled aluminium skeletons very good mechanical properties was characterized (for specialist solutions compression strenght is Rc = 73÷86 MPa, whereas bending strenght is Rg = 10÷15 MPa), excellent corrosion resistance, fastness to acid, fastness oil, minicipal wastes resistance and very low absorbability. Al-Si alloys with antimony were used for manufacturing the reinforcement skeletons. Antimony belong to the group of chemical elements which modify structure of Al-Si alloys. Application of antimony as modifier is often unsatisfactory. In presented research antymony was applied in order to decrease surface tension of liquid alloy to minimize production of Al2O3 oxides on stream front and to maximize the castability of the alloy. Application antimony as a modifier of structure was assumed in the background. Reinforcement experimental castings were manufactured in variables technological conditions: range of pouring temperature 983÷1013 K, temperature of mould 293÷333 K and height of gating system 265 mm. The aim of researches of mechanical properties was investigated in- fluence filler on compression strenght of composite shaped. Researches of compression strenght on composite samples, polymer concreate and aluminium skeleton samples were conducted. For samples of aluminium skeleton was obtained nonlinear dependence compresive stress on strain. This connected with buckling insignificant, which connectors of aluminium skeleton reinforcement were undergo during compression. Linear dependence compresive stress on strain for composite samples and polymer warp samples was observed. Polymer, sulfuric concrete samples under effect maximal stress undergo brittle cracking. However in case of samples from composite, aluminium skeleton limits brittle cracking of concrete. In composite samples obtained considerable increase of compression strenght in comparision with warp and reinforcement samples. The manufacturation conditions of experimental skeleton castings which ensure profitable mechanical properties of composite shaped. Based on tests, which were performed authors deduced, that manufacturing of composite castings is possible with use of traditional casting technology, without use of expensive laboratory - devices, with applied classical gating system. The following research will aimed to increase complexity of external and internal structure casting skeleton reinforcement.