Global Approach of Tribomechanical Development of Hybrid Aluminium Matrix Syntactic Foams

Abstract

Hybrid syntactic foams with AlSi12 aluminum matrix were produced by pressure infiltration. The volume ratio of iron and ceramic hollow sphere reinforcement (in the same size range) was varied and hybrid syntactic foams were also produced with bimodal size ceramic reinforcement. 2Previously a very detailed analysis of the mechanical properties of the composites was made with quasi-static compression tests and their tribological properties were investigated by pin-on-disc method in dry and lubricated conditions. The present article establishes and clarifies the correlations between mechanical and tribological properties. The coefficient of friction, height loss of the specimens and specific wear showed good correlation to different mechanical parameters e.g. density, structural stiffness and yield strength.The established trends and correlations between mechanical and tribological behavior enables a better understanding for materials design and selection for further applications for mechanically loaded sliding machine parts.

On the Mechanical Properties of Aluminum Matrix Syntactic Foams

“…[7] Theoretically, MMSFs can be produced from any kind of metals, however their matrix is usually a grade of lightweight alloy (most commonly from the family of Al [8][9][10][11][12][13][14][15][16][17][18] or Mg [19][20][21][22] alloys). [3,6,13,36,37] In the group of ceramics, most commonly 'fly-ash' [22,[38][39][40][41][42][43][44][45][46][47][48][49] (in some cases surface treated fly-ash [29] ), alumina, [50][51][52][53][54] or silicon carbide [4,[52][53][54] are applied. Even attempts to produce MMSFs with metallic glass matrix have been done.…”

“…The main two types of hybrid MMSFs are 1) the MMSFs that are filled by two or more different material hollow sphere sets and 2) the bimodal (or multimodal) MMSFs [2,3] (Figure 1b,c, respectively). [3][4][5][6] Besides this, MMSFs can be integrated with the concept of unidirectionally (or multi directionally) reinforced composites (Figure 1d). By the mixing of the above mentioned possibilities materials, scientists can engineer metallic foams with unique and outstanding À tailored À properties.…”

“…[35] The filler material (or reinforcement in the composite technologist point of view) is usually built up from oxide ceramics or from iron based metals (steels). [3,6,13,36,37] In the group of ceramics, most commonly 'fly-ash' [22,[38][39][40][41][42][43][44][45][46][47][48][49] (in some cases surface treated fly-ash [29] ), alumina, [50][51][52][53][54] or silicon carbide [4,[52][53][54] are applied. Fly-ash is a byproduct of coal power plants, they are quite cheap and available in large quantities, however their chemical composition can significantly vary and the scatter in their diameter is relatively high.…”

Pin on disc vizsgálatok zártcellás alumíniumhabokon

“…A Pin On Disc koptátó vizsgálát többféle ányágokhoz (fém, kerámiá, műányág) álkálmázhátó. Korábbán á Szent István Egyetemen szintáktikus fémhábokon végeztek ilyen jellegű vizsgálátokát tribológiái tulájdonságokát elemezve [9][10][11]. A próbátest geometriáját tekintve á henger áz ideális.…”

Abrasive Sensitivity of Martensitic and a Multi-Phase Steels under Different Abrasive Conditions

“…The harmonization of environmental and technical requirements is a complex aspect in the selection and development of the applied structural materials. Therefore, in abrasion areas sometimes light and corrosion-resistant polymers [ 10 ] or aluminum alloys are used, even when foamed [ 11 ], but where the presence of mass and strength is essential (e.g., tillage and cultivators), the use of different steels is preferred. Generally, alloyed martensitic steels are utilized in these applications, often with hard alloy coatings to aid the wear resistance [ 12 ].…”