Sliding Wear Tests Research Articles

Deformation behavior of plasma sprayed Fe-based amorphous/ nanocrystalline coating under multi-scale tribological contact

Deformation behavior of Fe-based amorphous/ nanocrystalline coating synthesized by plasma spraying has been studied under multi-scale tribological contact. Nano- and micro-scale scratch investigation under constant and ramped loading revealed that deformation occurred mainly through plowing of coating surface by the probe. During low load (nano-scale) scratch tests, shear band generation was detected in the form of serrations in lateral force/ coefficient of friction curves under both constant (2 and 5 mN) and ramped (0–5 mN) loading conditions. Prominent shear bands around the scratch track with lesser fracture/ chipping were observed at high load (micro-scale) under ramped loading. Further, high load nanoscratch test under constant loading revealed aggravated fracture and chipping on the coating surface. Macro-scale deformation behavior studied using ball-on-disc dry sliding wear test at constant applied load (10 N) revealed that dominating wear mechanism in the coating was fatigue accompanied by abrasive and oxidative wear.

Microstructure and mechanical properties of NiCoCrAlY laser cladding coating after high-current pulsed electron beam irradiation

ABSTRACTSurface modification of laser cladding coating NiCoCrAlY was carried out by high-current pulsed electron beam irradiation. The microstructure of the NiCoCrAlY coating after irradiation was studied by XRD and SEM. The results showed that the NiCoCrAlY cladding layer displays slip and a nanocrystalline structure following high-current pulsed electron beam irradiation. The high-density slip structure affects the residual stress on the surface of the melted coating, resulting in a change of the phase structure. The mechanical properties of the NiCoCrAlY coating were studied using a Vickers micro-hardness tester and a straight-line-reciprocating dry sliding wear tester. The results showed the average microhardness of the melted coating increased by 9%, and the average wear coefficient decreased by 33.7% after five electron beam irradiations.

OPTIMIZATION OF WEAR STUDIES ON LASER CLADDED AZ61 MAGNESIUM ALLOY WITH NANO-TITANIUM DIOXIDE USING GREY RELATIONAL ANALYSIS

Laser cladding (LC) is mostly employed to enhance the wear resistance of magnesium alloy substrates. Adding nanoparticles will further strengthen the tribo surface properties, making them suitable for applications requiring lightweight components. This work investigated a dry sliding wear analysis for the laser-cladded AZ61 magnesium alloy with TiO2 nanoparticles at different volume ratios through the LC method. The spatial dispersion of the TiO2 nanoparticles in the AZ61 magnesium alloy microstructure was analyzed using scanning electron microscopy (SEM). The reinforcement ratio, sliding speed, and normal load were selected to study the tribo performance of the cladded surface. Coefficient of friction (COF) and wear loss analyses were performed using a pin on the disc dry sliding wear test. The effect of dry sliding variables on reinforcement ratio was analyzed with an orthogonal array experimental design. Grey relational analysis (GRA) studied multiple wear test responses to reveal optimal conditions to decrease the wear and friction coefficient of the AZ61 laser cladded surface. The reinforcement percentage of nanoceramic TiO2 particles in the AZ61 alloy surface was the most significant factor, contributing 97.76%, followed by a contribution of 0.26% by sliding speed and a normal load of 1.82%, confirmed with the grey relational grade. Both SEM and GRA confirmed that the reinforcement ratio of 10% exhibited lower wear loss and friction coefficient. The revealed wear mechanism operating on the worn surface of laser-cladded AZ61 magnesium alloy was micro-grooving exerted by a counter surface at all sliding conditions. This study shows that the LC of magnesium alloys will be preferred in sliding seal and lightweight gear applications.

Synergy Study Between a Lubricant Oil Layer and a Microstructural Graphite to Reduce Friction and Wear of a Thermally Modified Low-Carbon Gray Cast-Iron Cylinder Liner

The results of a sliding wear tests on base and thermal treated gray cast iron (GCI) samples from internal combustion engine cylinder liner are reported here for dry and lubricated conditions. A thermal treatment was applied to samples of 10 x 10 mm to avoid the effect of residual stress and to obtain the microstructure of interest. Tribological tests were carried out up to 27000 cycles at room temperature. A frequency of 15 Hz, a stroke amplitude of 6 mm, and a maximum contact pressure of 1.12 GPa were selected. Under the unlubricated settings, a noticeable decrease in friction coefficient and specific wear rate are attributed to the appearance of irregular graphite nodules in the heating–quenching process. The significance of thermal treatment applied to low carbon cast iron in the derived self-lubricating function and its synergistic role with the oil lubricant is discussed. In this context, this work illustrates, for the first time, how the change in the morphology from flake graphite to irregular nodule graphite positively determines the reliability of gray casting irons.

Dry-sliding wear analysis and prediction using response surface method and fuzzy logic for Kota stone dust–fly ash–epoxy hybrid composites

This paper reports on the utilization of waste Kota stone dust and fly ash as filler materials in polymeric resin for the development of a new class of hybrid composite. Epoxy is taken as polymeric resin for the fabrication of different sets of hybrid composites. The fabricated samples are tested for their physical, mechanical, and dry-sliding wear properties. An experimental investigation shows the density, void contents, and water absorption rate increase as a linear function of fillers content. Mechanical testing is performed to evaluate the tensile, compressive, flexural, and hardness properties. From the experimentation, it is observed that the mechanical properties under investigation improve with the addition of either of the fillers. The maximum tensile strength obtained is 33.6 MPa, whereas flexural strength increases to 63.96 MPa resulting in an appreciable improvement. The compressive strength improves to 102.39 MPa and hardness reaches a Shore D number of 84. Sliding wear tests are performed as per the L16array based on the response surface method (RSM) using pin-on-disk apparatus. It has been observed that filler content, sliding velocity, sliding distance, and normal load in the declining sequence are significant in affecting the wear rate. Furthermore, the wear rate of composites is predicted with the help of response surface method and fuzzy logic within the experimental domain, and the results are compared with the outcomes reported in some of the existing literature. The study of worn composite surfaces using a scanning electron microscope resulted that the formation of wear tracks, grooves, craters, cavities, wear debris, etc. are some of the dominant mechanisms causing wear loss. As a result of our research, gainful utilization of wastes like Kota stone dust and fly ash for preparing polymer composites has opened up.

Mechanism Correlating Microstructure and Wear Behaviour of Ti-6Al-4V Plate Produced Using Selective Laser Melting

In the present study, a dry sliding wear test has been conducted to analyse the wear rate of Ti-6Al-4V alloy specimens which were fabricated using selective laser melting and conventional methods. Microstructure, micro- and nanohardness, and wear behaviour of selective laser melting specimens were investigated and compared with commercially available conventionally fabricated Ti-6Al-4V specimens. The mechanism correlating microstructure and wear behaviour of conventional and selective laser melting based Ti-6Al-4V specimens have been explained. The microhardness of the selective laser melting specimen was improved by around 22.4% over the specimen from the conventional method. The selective laser melting specimen showed broadened peaks and an increase in intensity height greater than that of the conventional specimen due to the presence of the martensite phase. The selective laser melting specimen possessed 41.4% higher nanohardness than that of the conventional specimen. The selective laser melting specimen had a 62.1% lower wear rate when compared to that of the conventional specimen. The selective laser melting specimen exhibited 62.7% less coefficient of friction than that of the conventional specimen at a 50 N load with 1.2 m/s sliding velocities. The finer needle-like microstructures of the specimen produced using the selective laser melting process had higher wear resistance, as it had higher hardness than the conventional specimen.

Superior wear resistance of dual-phased TiC–TiB2 ceramic nanoparticles reinforced carbon steels

The present study investigated the microstructure and wear properties of annealed carbon steels with the addition of TiC–TiB2 ceramic nanoparticles. It was found that the presence of 0.02 wt% nanoparticles could decrease the amount of widmanstatten structure, promote the formation of finer pearlite from 33.0% to 46.3% and refine the grains from 67.0 μm to 47.5 μm. In ball-on-plate reciprocating sliding wear tests, the wear volume loss was reduced up to 27.2% while the test load of 50 N and sliding velocity of 60 mm/s were utilized. After examining the wear tracks, it was observed that the spalls, grooves, smearing, delamination, oxidative areas and wear debris were found within the worn areas. The ceramic nanoparticles increased the hardness of substrates, inhibited dislocations and plastic deformation, retarded the cracks on surfaces and sub-surfaces, and withstand the load which enhanced the anti-wear performance of annealed carbon steels. This research could provide a new method to improve the wear performance of carbon steel components.

Sliding wear behavior of Co-Cr-Mo alloys with C and B additions for wear applications

The present study analyzes the effect of boron and carbon additions on the microstructure and wear performance of a Co-30Cr-5Mo alloy. This alloy was based on the chemical composition of the ASTM F75 alloy which is frequently used in gas turbines and high temperature applications subject to wear. For this study, a 0.5 wt% B and C additions were used to modify the microstructure and obtain a 37 %vol of reinforcing phases composed by M23C6 carbides and M3B2 borides. The microstructure of this alloy showed a network formed by the reinforcing phases, similar to the microstructure observed in the Co-30Cr-8.5W alloys, exhibiting hardness values between 43 and 48 HRC and excellent wear properties. Characterization was made through optical and electronic microscopy and X ray diffraction for phase identification in the as-cast and after heat treatment at 1200 °C for 3 h. Hardness was measured in both conditions in HRC scale. Sliding wear tests based on G77 standard were undertaken with 50 and 100 N load during 5 km sliding distance. The friction coefficient was monitored during the tests by measuring the normal and tangential forces. Wear depth, surface roughness, and volume wear losses were measured by using a non-contact 3D profiler. Results show an increase on the hardness and the reduction of the wear losses, in the alloy with the simultaneous addition of 0.5% wt of B and 0.5% wt of C. A decrease in the average friction coefficient with the increase in the volume of reinforcing phases was also observed. The base alloy showed a high degree of adhesion and higher roughness values. On the other hand, the predominant wear mechanism in the reinforced alloys was oxidative wear followed by a small degree of adhesion and micro-ploughing caused by the wear products between sliding surfaces. Cross-sectional analysis showed a lower degree of deformation under the surface in the B and C added alloys, attributed to the presence of the reinforcing phases and the strengthening of the matrix promoted the transition from adhesive wear to oxidative wear.

Correlating topographical characteristics of relaxed layer to tribology in Cu-Gr-TiC composite system

The copper graphite composites are often being applied as bearing materials in various industries. In present investigation, the correlation between the topographical characteristics of relaxed layer to tribology in Cu-Gr-TiC composite system has been investigated. For this purpose, the flake powder metallurgy approach was used to fabricate Cu-Gr-TiC composites and the tribology of these composites was studied under lubricating (synthetic SAE 20W40 motor oil) condition. Variable loads of 10 N–70 N, sliding velocities of 0.75 m s−1–3 m s−1, and sliding distances of 2000 m–8000 m were the test parameters for sliding wear of composites under lubricating conditions. The worn surfaces were examined using SEM and EDS while topographical parameters were studied by AFM. The other properties like mechanical and physical properties were also studied for the sintered samples to better correlate the overall results of surface topography and tribology. The tests depict the successful fabrication of the composites. The composite having 4.5 wt% TiC particles exhibit maximum hardness and least wear and CoF under lubricating environment. The results of sliding wear test conducted under lubrications revealed that rise in the concentration of nano TiC particles in the matrix improves the composite’s tribological performance. The mechanism of wear for pure copper sample is abrasion whereas for TiC particle reinforced composite is smooth ploughing and delamination. The surface topographical parameters that are average surface roughness, area peak to valley height and skewness depicted less roughness values and better load bearing capacity for 4.5 wt% TiC reinforced Cu-Gr sample. The fabricated TiC reinforced copper graphite composites could be utilized as bearing materials in automotive industries.

Advanced diamond-reinforced metal matrix composite (DMMC) coatings via HVAF process: Effect of particle size and nozzle characteristics on tribological properties

High-velocity air fuel (HVAF) spraying is a versatile and cost-effective platform to fabricate wear resistant coatings. In this work, deposition of Nickel–Phosphorus cladded diamond feedstock is explored as a greener alternative to realize highly wear resistant large-area coatings. To the best of authors knowledge. this is the first study that has utilized HVAF technique for developing wear resistant Ni–P coatings reinforced with diamond (NCD). This work also aims to understand the effect of particle size by using coarse (20–30 μm) and fine NCD (10–15 μm) particles as feedstock. The importance of utilizing appropriate processing conditions was also highlighted by using two different nozzle configurations, for which the two powder particle sizes exhibited considerable differences in terms of microstructure, phase characteristics and mechanical properties. Further, the effect of annealing on the above coating characteristics was also examined, and it is shown that optimal spraying conditions can preclude the need for post-treatment. Furthermore, the as-deposited and annealed coatings were subjected to sliding wear tests to assess their tribological performance. Post-wear analysis performed on worn surfaces revealed the associated wear mechanisms. The results ensuing from this work lay the foundation for realizing new generation of HVAF sprayed wear resistant Ni–P/diamond composite coatings for diverse applications.

Study on Sliding Wear Characteristics of Tungsten Carbide Particle Reinforced Copper Matrix Composites Under Electrical Contact

Tungsten carbide (WC) particles reinforced copper (Cu) composites (1⁓5 wt.% WC/Cu) were fabricated by a hot-pressed sintering process and their mechanical, electrical properties and sliding wear behaviors were studied. The results show that the relative density and electrical conductivity of the sintered composites decrease whereas the microhardness increase, with increasing the mass fraction of WC reinforcements. During the sliding wear tests without electrical current, the wear rate of the WC/Cu composites decreases with an increase of WC reinforcement mass fraction. The increase in the normal load leads to the increase of wear rate. The wear rate under electrical contact increases with the increase of electrical current density. The dominant wear mechanism under electrical contact sliding conditions is the combination of the abrasive wear and oxidations resulted from electrical currents. The WC/Cu composites are promising electrical contact materials to restrain spark/arc discharge during the electrical contact sliding.

B2-structured Fe3Al alloy manufactured by laser powder bed fusion: Processing, microstructure and mechanical performance

Prealloyed Fe3Al was successfully manufactured by laser powder bed fusion. The best set of process parameters led to parts with a relative density of 99.5 %, a surface roughness, Sa, of 31.5 ± 5.6 μm and a hardness of 319 ± 14 HV0.1. Its microstructure as well as its mechanical properties at room and high temperatures were analyzed. The results of the chemical composition showed minor variations in aluminum content oscillating between 21 and 28 at.% along the melt pool. Additionally, elongated grains were observed to grow parallel to the building direction, as well as the development of a weak {001} texture along the building direction. The mechanical properties were influenced by the temperature. Compression tests showed a loss in strength with the increase in temperature, from a yield strength of 621 ± 40 MPa at room temperature to 89 ± 20 MPa at 650 °C. Reciprocating sliding wear tests showed that fragmentation of the intermetallic at room temperature occurs, whereas plastic deformation dominated at higher temperatures. For all temperatures, tribochemical wear was also present due to the oxidation of wear debris.

Characteristics of Hydroxyapatite-Modified Coatings Based on TiO2 Obtained by Plasma Electrolytic Oxidation and Electrophoretic Deposition

In order to modify the surface of light metals and alloys, plasma electrolytic oxidation (PEO) is a useful electrochemical technique. During the oxidation process, by applying a positive high voltage greater than the dielectric breakdown value of the oxide layer, the formation of a ceramic film onto the substrate material is enabled. The resulting surface presents hardness, chemical stability, biocompatibility, and increased corrosion wear resistance. The current study aims to investigate the corrosion resistance and tribological properties of PEO-modified coatings on titanium substrates produced by applying either direct or pulsed current in a silicate-alkaline electrolyte. In this way, a uniform TiO2 layer is formed, and subsequently, electrophoretic deposition of hydroxyapatite particles (HAP) is performed. The morpho-structural characteristics and chemical composition of the resulting coatings are investigated using scanning electron microscopy combined with energy dispersive spectroscopy analysis and X-ray diffraction. Dry sliding wear testing of the TiO2 and HAP-modified TiO2 coatings were carried out using a ball-on-disc configuration, while the corrosion resistance was electrochemically evaluated at 37 °C in a Ringer's solution. The corrosion rates of the investigated samples decreased significantly, up to two orders of magnitude, when the PEO treatment was applied, while the wear rate was 50% lower compared to the untreated titanium substrate.

Mechanical and tribological properties of 5A06 aluminum alloy at low temperature

There are significant differences in the mechanical and tribological properties of 5A06 aluminum alloys subjected to a wide temperature range, and the related research has received very limited attention so far. In this paper, the mechanical properties of 5A06 aluminum alloy were obtained by tensile test at temperature as low as 77K, which laid a foundation for analyzing its tribological properties. Then, dry linear reciprocating sliding wear tests were performed on a ball-on-disc tribometer to explore the friction behavior and wear mechanism of 5A06 aluminum alloy at different temperatures from low temperature (173K) to room temperature (293K). Finally, the wear morphology and chemical composition of the worn surface were characterized by an optical 3D measurement system and a scanning electron microscope equipped with an energy dispersive spectroscopy. The results indicate that the ambient temperature affects the tribological properties of 5A06 aluminum alloy by changing its mechanical properties and the dissipation of friction heat. Compared with 293K, the coefficient of friction decreases by 14.66% and the wear rate decreases by 70.79% at 173K. The main wear mechanisms of 5A06 aluminum alloy are delamination wear and oxidation wear at 293K and 273K, and a combination of abrasive wear, adhesive wear and oxidation wear at 223K and 173K.

Effect of cryogenic treatment on wear behavior of Sleipner cold work tool steel

Cryogenic treatment, also known as subzero heat treatment, is a cooling process that complements conventional heat treatment to improve the properties of metals. Unlike coatings, it is a one-time, inexpensive, permanent operation that affects the entire part. This method is mainly applied to tool steels used in mold making. In this study, the changes caused by the effects of shallow and deep cryogenic treatment on Sleipner cold work tool steel were investigated in terms of microhardness, microstructure, coefficient of friction (COF), and wear rate (WR). For this purpose, the test specimens were subjected to the cryogenic treatments performed at two different temperatures (−80 ºC for the shallow cryogenic treatment (SCT) and − 180 ºC for the deep cryogenic treatment (DCT)) and various retention times (12 h, 24 h for SCT and 12 h, 24 h, 36 h for DCT). Dry sliding wear tests were carried out under different loads (10 N and 20 N) and varying test durations (60, 120, and 240 min) at a constant sliding speed of 0.075 m/s. According to the microhardness results, it was determined that the cryogenic treatment increased the hardness by 6.53 %. According to the microstructure investigations, a more homogeneous structure was observed with the cryogenic treatment, and secondary carbide precipitations were detected. It was observed that the conventional heat-treated (CHT) sample gave the highest COF value with an average coefficient of friction of 0.63. The lowest COF value of 0.58 was observed in the DCT-12 sample. After the wear tests, the lowest wear rate value for both load values was obtained from the DCT-36 specimen.

Three-dimensional microscopic comparison of wear behavior between immature and mature enamel: an in vitro study

BackgroundDental enamel, the hardest outermost layer of a human tooth, is subjected to occlusal forces throughout life during different oral function as talking, mastication etc. Due to this continuous stress, wear causes the loss of this protective shell. This study aimed to detect microscopic differences in enamel’s wear behavior among different age groups of adolescents and adults.Aims and methodsEnamel specimens from immature open-apex and mature closed-apex premolars were subjected to simulated occlusal wear of impact and sliding wear test ISWT. Upper and lower enamel specimens were made to come in contact under controlled conditions. The enamel specimens’ surfaces were examined using different microscopes. The upper and lower specimens were subjected to the following tests; pre-test light microscopy examination, enamel specimens’ preparation for ISWT, scanning laser confocal microscopy of upper specimens, three-dimensional (3D) colored laser microscope and a Profilometer imaging of the lower specimens.ResultsWear characteristics, including wear areas, crater depths, and relation to enamel microstructures, differed among different age groups. Immature enamel from the upper specimens was more resistant to chipping than mature enamel with no statistically significant wear area difference. The immature enamel craters from the lower specimens were wider and deeper than those in the mature enamel; the wear areas in the mature enamel in the lower specimens were almost flat and smooth. The wear areas in the immature enamel in the lower specimens were significantly larger than those in the mature enamel.ConclusionsWear characteristics of the immature enamel are different from those of the mature enamel. Hence, it should be repaired using restorative materials with compatible wear properties.

Tribocorrosion Behaviour of a Ti–25Nb–3Zr–2Sn–3Mo Alloys Induction Nitride Layer in a Simulated Body Fluid Solution

Ti–25Nb–3Zr–2Sn–3Mo (TLM) alloys have been used in orthopaedics due to their excellent biocompatibility. However, the poor tribological performance caused by the low shear strength limits the applicability of TLM alloy. Herein, the surface of the TLM alloy was strengthened by induction nitriding technology, and the microstructure of the formed nitride layer as well as its corrosion property were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM) and electrochemical workstation. The results showed that a gradient nitride layer with a thickness of ~30 μm was obtained on the surface of the TLM alloy after induction nitriding and the surface microhardness of the TLM alloy also increased from approximately 230 HV to 1253 HV. Meanwhile, the corrosion resistance of the TLM alloy in simulated body fluids (SBFs), was significantly improved by the nitride layer, which was supported by the corrosion potential value increasing from −665.77 (the raw sample) to −241.00 mV (the nitrided sample). Triborrosion behaviour is also characterized by a reciprocating sliding wear tester connected to an electrochemical workstation with different electrochemical conditions. The results evidenced that the TLM alloy has excellent tribocorrosion resistance after induction nitriding, who’s the mechanical material loss (WA) was only 0.23% of that of the raw sample under a 10 N load, and the total material loss (WT) was 15% of that of the raw sample.

Modification of flame-sprayed NiCrBSi alloy wear-resistant coating by friction stir processing and furnace re-melting treatments

Wear-resistant coatings are critical to many industries for extending the life span of components and reducing costs. NiCrBSi coatings are one of the most utilized Ni-base wear-resistant coatings for both ambient and high temperature applications, capable of being applied by both welding and thermal spray processes. If thermal spraying is used to apply NiCrBSi coatings, a modification treatment is often needed to minimize imperfections of the coating layer and improve its properties. Here, use of friction-stir processing (FSP) and furnace re-melting (FR) processing are investigated in terms of their effect on the microstructure and wear properties of a NiCrBSi coating applied on plain carbon steel. Optical and electron microscopy, X-ray diffraction analysis, sliding wear test, and micro-hardness measurements have been used to characterize samples. Based on the results, FSP improved performance versus FR in terms of homogeneity, micro-hardness enhancement, and elimination of defects, leading to more homogeneous coating structures. Also, porosity in the coating layer drastically decreased from 14 % in the as-sprayed condition to 0 % after the FSP process. Additionally, by performing the friction-stir processing, the hardness of the coating increased by 60 % due to a reduction of defects in the layer while breaking down and homogeneously dispersing hard particles in the microstructure.

A comparative analysis of the effect of laser surface treatment on the dry sliding wear behavior of ductile cast irons with different microstructures

In this study, the wear behavior of ferritic (GJS 400) and pearlitic (GJS 700) ductile cast iron (DCI) specimens after laser surface hardening were investigated comparatively. In general, multi-pass laser applications are inevitable in a laser surface treatment (LST) applied for surface hardening because the laser spot diameter is quite small compared to the applied surface area. This situation may cause a decrease in wear resistance due to residual stress formation because of the thermal gradient and softening effect due to the overlap ratio. In this study, a single-pass laser surface hardening (LSH) process with a laser pulse area of 20 × 5 mm2 compatible with the laser energy density (6.28 J/mm3) used in the literature, was applied to overcome these limitations. Thus, it is aimed to make it possible to evaluate the comparative analysis more reliably. After LSH processes, hardness values of DCI samples increased approximately 4.3 times compared to untreated ones due to the transformation hardening effect. In the microstructure of the laser-treated pearlitic DCI samples, martensite was present as the dominant phase in addition to a small amount of residual austenite. As for the ferritic DCI samples, the ledeburite and martensite phases were detected. Dry sliding wear tests were performed using different loads (5 N, 10 N) and sliding speeds (10 mm/s, 20 mm/s, 30 mm/s). As a result, the wear volume loss values of laser-treated ferritic and pearlitic DCI samples could be reduced by approximately 26.6% and 30.7%, respectively, compared to untreated ones. The COF values of the untreated samples increased with increasing load, while those of LSHed decreased. Severe plastic deformation and delamination were observed for untreated samples, while mild plastic deformation and micro-grooves were observed for samples with LSHed.

Mechanical and dry sliding wear analysis of porcelain reinforced SAE660 bronze bearing alloy composite fabricated by stir casting method

In today's competitive global market, the conventional engineering materials need to be replaced with novel materials. The present research aims to investigate the mechanical and tribological performance of the porcelain reinforced conventional bronze bearing alloy (SAE660) composite made by liquid metallurgy stir casting process. The mechanical characterizations of the composites were carried out by means of a Vickers microhardness tester and universal testing machine. A pin-on-disc wear test rig was employed to examine the wear behavior of matrix alloys and composites under atmospheric conditions. After the sliding wear test, the worn surfaces were analyzed with a scanning electron microscope (SEM). The test results revealed that the addition of porcelain as a reinforcement (3, 6 and 9 wt%) significantly enhanced the mechanical and tribological performance of the SAE660 bronze bearing alloy. The composite containing 6 wt% of porcelain exhibited better mechanical properties whereas 9 wt% porcelain reinforced composite exhibited maximum wear resistance. The wear mechanisms such as delamination, ploughing, and abrasion wear were identified as the main wear mechanisms for material removal during the sliding wear test.