Wear properties of magnesium matrix composites reinforced with SiO₂ particles

Abstract

PurposeThe purpose of this paper is to improve the wear resistance and tribological properties of magnesium and its alloys in order to apply them to the friction components.Design/methodology/approachWear test, microhardness measurements, X‐ray diffraction (XRD), optical and electron microscopy examinations were applied.FindingsThe ceramic SiO2, which has different particle‐sized reinforced pure Mg‐SiO2 composites, is produced by powder metallurgy using high ball milling, pressing and sintering. Mg2Si and MgO intermetallic phases produced by powder metallurgy in the Mg‐SiO2 composite are dispersed as homogeneous into the Mg matrix. Mg‐SiO2 composites exhibited a lower wear rate than the unreinforced pure magnesium specimens. Despite the pure Mg, the wear resistance of the composite is 61 per cent and the wear volume decrease with reducing SiO2 particle size. The hardness of the composite is increased in a ratio of 70 per cent with the distribution of the Mg2Si and MgO phases into the Mg matrix.Practical implicationsIn this paper, pure Mg powder with purity of 99.9 per cent and SiO2 powders with a mean particle size of −500, −250, −125, −75 and −10 μm are mixed by mechanical alloying. The wear behaviour of Mg‐SiO2 composite, with the different particle‐sized composites dispersed with Mg2Si and MgO intermetallic phases under dry friction condition is studied. The microstructural and mechanical properties of composite material samples are determined by differential scanning calorimeter, XRD, microhardness, optical and scanning electron microscopy tests.Originality/valueSiO2 particles distributed in the matrix are effective to improve hardness and wear resistance when contacting counter materials. In the present study, the magnesium powders with different particle size SiO2 powders are mechanically alloyed with a Turbola Spex 80000 mixer.

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“…pilling) along with heavy scratches which could have contributed to lowering the friction between the bottles (soft material) against the conveyor belt (harder material) (Figure 3, right, see arrows). This mixed abrasive-plastic deformation mechanism has been observed in other studies (Aydin and Findik, 2010). However, this deformation was not observed on the aluminium cans, whose worn area was characterised by linear scratches only (i.e.…”

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“…In addition, the surface films may cause the consequence of sullying, oxidizing and removing the material. Mustafa [17] has created an impression with respect to an explanation of the occurrence of dry friction in composite materials. According to his job, it has been reported that the aim behind friction is cross-section vibration.…”

“…Additionally, substance responses, for example, tribological oxidation and disintegrations, happen -every one of these variables at long last leads to fractures, cracks and wear. Depending on the load, rotational speed and viscosity, the operating point of a journal bearing can be located in a fluid, mixed, or boundary friction scheme [17]. Using a Stribeck curve, this relationship can be viewed as in Figure 2.…”

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“…Each group of material has its unique properties in term of mechanical and chemical properties. For example, metal has high thermal conductivity, high hardness level and high tensile strength compared to the ceramic material which is low fracture characteristic, high elastic feature and their hardness depending on the temperature effect [8,9]. Besides that, in term of low density, low mass, higher performance resistance of abrasion and better tribology behaviour the material such as ceramic is advantageous compared to metal [10,11].…”