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Projects / Programmes source: ARIS

Developmnt of multi-functional B4C-Al and B4C-Mg composites for emerging applications

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Research activity

Code Science Field Subfield
2.04.00  Engineering sciences and technologies  Materials science and technology   

Code Science Field
T152  Technological sciences  Composite materials 
Keywords
B4C-Al composite, B4C-Mg composite, infiltration, multi-functional materials
Evaluation (rules)
source: COBISS
Evaluation of bibliographic research performance indicators according to ARIS methodology
Citations Citations for bibliographic records in COBIB.SI that are linked to records in citation databases
source: WoS source: Scopus source: COBISS
Researchers (7)
no. Code Name and surname Research area Role Period No. of publications
1.  17165  PhD Aleš Dakskobler  Materials science and technology  Researcher  2005 - 2008  153 
2.  13250  Marina Jelen  Materials science and technology  Researcher  2005 - 2008  62 
3.  04968  PhD Varužan Kevorkijan  Materials science and technology  Head  2005 - 2008  352 
4.  26151  Fedja Marušič  Materials science and technology  Researcher  2005  8 
5.  15599  Tomislav Pustotnik    Technical associate  2006 - 2008  8 
6.  11093  PhD Srečo Davor Škapin  Chemistry  Researcher  2005 - 2008  594 
7.  19821  PhD Marko Udovič  Chemistry  Researcher  2005 - 2008  68 
Organisations (2)
no. Code Research organisation City Registration number No. of publications
1.  0106  Jožef Stefan Institute  Ljubljana  5051606000  91,887 
2.  0719  IMPOL Inustry of Metal Semimanufactures d.o.o.  Slovenska Bistrica  5040736  138 
Abstract
The objective of the proposed project is the development of B4C-Al-Si and B4C-Mg compoisites with tailored mechanical (fracture toughness, hardnes, wear resistance) and thermal (conductivity, dilatation) properties. By modifying the surface chemical composition of B4C particles in the perform, the formation of single or complex bonding phases having mechanical properties (especially hardness) comparable with sintered B4C, during pressureless infiltration of the perform with molten metal or by an additional thermal treatment of infiltrated perform, will be assured. For achieving these aims the following trials will be made: (i) applicability of additives as boron and magnesium, which with aluminium are forming AlMgB14 with hardness (35-40 GPa) exceeding hardness of B4C, (ii) combination of additives B, Mg and TiB2, which form complex copound AlMgB14-xTiB2, which hardness is even higher (40-46 GPa), and (iii) efficiency of the hexagonal-BN protective layer, made by mechanical alloying, which should prevent the contact between molten aluminium and B4C. The possible inhibiting of byproducts (e.g. Al3C4) formation will be tested by applying Al-Si alloy wit 45-70 wt %Si. The assumption is that lower Al concentration will cause that the rate of infiltration will be significantly higher in comparison with the chemical formation of byproducts. Preparation of composites by applying infiltration has an additional advantage, enabling the formation of graded composites, by increasing or decreasing the grain size of the B4C particles in the individual composite layers. In such a way, it is possible to gain, within composite layers, graded variation of several mechanical and thermal properties. Due to the great practical importance of functionally graded materials, several graded B4C-Al composite samples will be made by infiltration in order to investigate their microstructure as well as selected mechanical and thermal properties. Infiltration of B4C with magnesium as an alternative to B4C-Al system is still not enough investigated. In contact with B4C, molten magnesium, in opposite to aluminium, does not form any carbides, which, as a rule, have negative influence on the mechanical properties of the composite. According to that, as a part of the proposed project tasks, the B4C-Mg composites will be prepared by pressureless infiltration, characterized and functionally compared with B4C-Al composites.
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