Abrasive Wear Characteristics Research Articles

Expression of Concern: Synergy of silica sand and waste plastics as thermoplastic composites on abrasive wear characteristics under conditions of different loads and sliding speeds

Expression of Concern: Synergy of silica sand and waste plastics as thermoplastic composites on abrasive wear characteristics under conditions of different loads and sliding speeds

Tribological characteristics of three-body abrasive wear on MoS2 films

Tribological characteristics of three-body abrasive wear on MoS2 films

Abrasive wear behavior of AZ31 −B4C composites

Abrasive wear behavior of AZ31 −B4C composites having varying amount of B4C particles (0 −2 wt%) is investigated. AZ31 −B4C composites are synthesized through ultrasonic assisted stir casting method. Characterizations of as-cast composites are performed through optical microscopy and field emission scanning electron microscopy. Compositional analyses are performed using energy dispersive X-ray analysis (EDS). Microstructural analyses disclose uniform distribution of B4C ceramic particles in AZ31 matrix. Compositional analyses confirm incorporation of B4C particles in AZ31 matrix. Both microhardness testing and density measurements are performed. Microhardness value is enhanced by 54.9% compared to base alloy by incorporating 2 wt% of B4C particles. Pin-on-disk tribotester is employed to scrutinize abrasive wear and friction characteristics of developed materials at varying sliding distance (40, 50 and 60 mm track dia.) and different abrasive grits (400, 500 and 600 grit). Wear rate of AZ31 alloy is about 1.3 − 1.5 times more than AZ31 − 2.0B4C composite for all experimental conditions. Wear rate reduces with increase in abrasive grit size while the same increases with increase in sliding distance. Finally, worn surface morphology of developed materials is also analyzed through FESEM and EDAX spectra. Examination of worn surface morphology discloses that abrasion and oxidation are dominant for composite samples.

Tribological behavior of styrene butadiene rubber conveyor belts: effects of applied load and rotational speed

Conveyor belts are used for material transportation in the mining and construction industries. The friction and wear properties of the styrene butadiene rubber (SBR) used in conveyor belts are investigated, including the effects of the applied load and rotational speed on the friction coefficient and weight loss. The sliding wear mechanism of the SBR is analyzed using scanning electron microscope, energy dispersive spectrometer, and Fourier transform infrared spectrometer. The results demonstrate that the friction coefficient and total weight loss of SBR increase as a function of rotational speed, whereas the friction coefficient decreases and the total weight loss increases as a function of increasing applied load. The maximum friction coefficient occurred at a loading of 10 N and a speed of 120 revolutions·min−1, and the maximum total weight loss occurred at a loading of 20 N and a speed of 120 revolutions·min−1. In comparison to the unworn surface, the worn surface of the SBR exhibits melting, adhesive, and abrasive wear characteristics. The increases in the hardness, yellowing, oxygen content, and the number of complex structures, such as hydroxyl, aldehyde, ketone, and ether groups, occur simultaneously.

Investigating the impact of TiO2 filler on abrasive wear characteristics of bamboo fiber-reinforced epoxy composites using the Taguchi method

Purpose The purpose of this study is to investigate the impact of titanium oxide (TiO2) filler on the abrasive wear properties of bamboo fiber reinforced epoxy composites (BFRCs) using a Taguchi approach. The study aims to enhance the abrasive wear resistance of these composites by introducing TiO2 filler as a potential reinforcement, thus contributing to the development of sustainable and environmentally friendly materials. Design/methodology/approach This study focuses on the fabrication of epoxy/bamboo composites infused with TiO2 particles within the Wt.% range of 0–8 Wt.% using hand layup techniques. The resulting composites were subjected to wear testing according to ASTM G99-05 standards. Statistical analysis of the wear results was carried out using the Taguchi design of experiments (DOE). Additionally, an analysis of variance (ANOVA) was used to determine the influential control factors impacting the specific wear rate (SWR) and coefficient of friction (COF). Findings The study illuminates how integrating TiO2 filler enhances abrasive wear in epoxy/bamboo composites. Statistical analysis of SWR highlights abrasive grit size (grit) as the most influential factor, followed by normal load, Wt.% of TiO2 and sliding distance. Analysis of the COF identifies normal load as the primary influential factor, followed by grit, Wt.% of TiO2 and sliding distance. The Taguchi predictive model closely aligns with experimental results, validating its reliability. The morphological study revealed significant differences between the unfilled and TiO2-filled composites. The inclusion of TiO2 improved wear resistance, as evidenced by reduced surface damage and wear debris. Originality/value This research paper aims to integrate TiO2 filler and bamboo fibers to create an innovative hybrid composite material. TiO2 micro and nanoparticles show promise as filler materials, contributing to improved tribological properties of epoxy composites. The utilization of Taguchi’s DOE and ANOVA for statistical analysis provides valuable guidance for academic researchers and practitioners in optimizing control variables, especially in the context of natural fiber reinforced composites.

Effect of ceramic particle shape on wear resistance mechanism of zirconia toughened alumina ceramic reinforced high chromium cast iron architectural composite

Zirconia toughened alumina (ZTA)/high chromium cast iron (HCCI) architectural composites are widely used in many fields, and several factors can affect their wear resistance. The objective of this study was to examine the three-body abrasive wear characteristics of an irregularly shaped ZTA/HCCI composite in comparison with conventional HCCI and crushing ZTA/HCCI composites. Irregularly shaped ZTA was prepared in this study, and ZTA/HCCI composites were fabricated with different ZTA shapes. The mass loss rates of crushed and irregularly shaped ZTA/HCCI composites were observed 0.29 % and 0.26 %, respectively, when subjected to the three-body abrasive wear process. These results indicated the improved wear resistance of the ZTA/HCCI composite. Because the irregularly shaped ZTA ceramic particles did not have sharp edges, which suppressed the tendency for stress concentration, the internal stress was significantly reduced. Therefore, the likelihood of crack formation was substantially reduced, reducing the probability of failure and increasing the wear resistance. In this study, this approach provided a new idea to enhance the wear resistance.

Influence of T6 heat treatment on the microstructure and tribological properties of ADC12-GNPs composites

The graphene nanoplatelets (GNPs) were used as reinforcement to fabricate the ADC12-GNPs composites via ultrasonic-assisted casting, then the composites were adopted T6 heat treatment. The microstructures and wear performance were investigated in detail. The GNPs effectively refined the α-Al grains and form a strong Al-GNPs interfacial structure with the matrix, and the T6 heat treatment further rounded the Si phases and precipitated nanoscale θ′-Al2Cu. With the increase of load, the wear rate increases. And with the increase of sliding velocity, the wear rate shows a tendency of decreasing and then increasing. The wear rate and COF of the ADC12-GNPs/T6 composites showed a maximum reduction of 63.3 % and 39.2 %, respectively, compared to the matrix. The self-lubrication and refinement strengthening effect of GNPs improved the wear resistance, and the interaction between nanoscale θ′-Al2Cu precipitates and dislocations enhanced the tribological properties. Wear morphology and three dimensional profile analysis showed that the surface roughness of the ADC12-GNPs/T6 composite was 2.73 μm, which was 150 % lower than that of the matrix (6.82 μm) when the sliding velocity was 0.28 m/s and the load was 40 N, showing typical abrasive wear characteristics.

Comparative Micro-Scale Abrasive Wear Testing of Thermally Sprayed and Hard Chromium Coatings

Nowadays, due to the carcinogenic effects of chrome, replacing the hard chromium used for hydraulic components like rods and cylinders is becoming increasingly requested. Thermally sprayed coatings are a solution to the problem; however, proper understanding and characterisation of their tribological behaviour are essential for the successful exploitation of surface engineering. Thus, the main aim of this study is to evaluate the abrasive wear characteristics of two metal sprayed layers, tungsten carbide (WC) deposited through the high-velocity oxygen fuel coating (HVOF) method and Fe alloy coating deposited through thermal spraying with an electric arc with a wire-electrode G3Si1, and compare the results with those of an electrochemically deposited hard chromium layer. Their wear resistance is then related to their hardness. The results highlight the tribological performances of the thermally sprayed coatings. The HVOF WC10Co4Cr coating has a wear coefficient and a material wear volume that are hundreds of times lower than those of the other two coatings.

Effect of Stroke Length on the Abrasive Wear Characteristics of A-356 (0–10 wt%) SiCp Composite in Reciprocating Sliding Conditions

In this study, abrasive wear behavior of A356/(0–10)wt.% SiCp composites are reported using an in house designed and developed pin-on-reciprocating plate abrasive wear and friction test rig confirming to ASTM G133-05 standards. A356 alloy and A356/10 wt.% SiCp composite are prepared through stir casting method adopting standard foundry practices. The hardness of heat treated A356/10 wt.% SiCp composite is found to be 22.56% higher than A356 alloy. This study primarily focused on the effect of variation of stroke length from 65 mm to 100 mm on the abrasive wear characteristics of A356 alloy and it’s composite at different loads (5, 7.5, 10, and 12.5 N) by keeping a constant sliding velocity of 0.2 m/s slid through 25 m. The abrasive wear is found to be higher for the alloy than the composite. It is also revealed from the experimental investigation that as the stroke length is reduced from 100 mm to 65 mm, the abrasive wear loss of A356 alloy and its composites are found to increase. The reason for increase in wear is attributed to high frequency of oscillation and less energy dissipation per cycle at lower stroke length (65 mm) compared to that at higher stroke length (100 mm). Coefficient of friction (CoF) of tribo pairs tested is found to increase with load at the two different stroke lengths studied.

Parameter Optimization and DEM Simulation of Bionic Sweep with Lower Abrasive Wear Characteristics.

High wear rates during the tillage process often result in significant financial losses and wasted farming seasons. In this paper, a bionic design was used to reduce tillage wear. Inspired by wear-resistant animals with ribbed structures, the bionic ribbed sweep (BRS) was designed by combining a ribbed unit with a conventional sweep (CS). BRSs with different parameters (width φ, height h, angle θ, and interval λ) were simulated and optimized using the DEM and RSM methods at a working depth of 60 mm to evaluate the magnitude and trends of three responses: tillage resistance (TR), number of contacts between the sweep and soil particles (CNSP), and Archard wear value (AW). The results showed that a protective layer could be created on the surface of the sweep with a ribbed structure to reduce abrasive wear. Analysis of variance proved that factors φ, θ, and λ had significant effects on AW, CNSP, and TR, while factor h was insignificant. An optimal solution was obtained using the desirability method, including 8.88 mm φ, 1.05 mm h, 3.01 mm λ, and 34.46° θ. Wear tests and simulations showed that wear loss could be effectively reduced at different speeds by the optimized BRS. It was found to be feasible to create a protective layer to reduce partial wear by optimizing the parameters of the ribbed unit.

Synergy of silica sand and waste plastics as thermoplastic composites on abrasive wear characteristics under conditions of different loads and sliding speeds

The diverse nature of polymers with attractive properties has replaced the conventional materials with polymeric composites. The present study was sought to evaluate the wear performance of thermoplastic-based composites under the conditions of different loads and sliding speeds. In the present study, nine different composites were developed by using low-density polyethylene (LDPE), high-density polyethylene (HDPE) and polyethylene terephthalate (PET) with partial sand replacements i.e., 0, 30, 40, and 50 wt%. The abrasive wear was evaluated as per the ASTM G65 standard test for abrasive wear through a dry-sand rubber wheel apparatus under the applied loads of 34.335, 56.898, 68.719, 79.461 and 90.742 (N) and sliding speeds of 0.5388, 0.7184, 0.8980, 1.0776 and 1.4369 (m/s). The optimum density and compressive strength were obtained to be 2.0555 g/cm3 and 46.20 N/mm2, respectively for the composites HDPE60 and HDPE50 respectively. The minimum value of abrasive wear were found to 0.02498, 0.03430, 0.03095, 0.09020 and 0.03267 (cm3) under the considered loads of 34.335, 56.898, 68.719, 79.461 and 90.742 (N), respectively. Moreover, the composites LDPE50, LDPE100, LDPE100, LDPE50PET20 and LDPE60 showed a minimum abrasive wear of 0.03267, 0.05949, 0.05949, 0.03095 and 0.10292 at the sliding speeds of 0.5388, 0.7184, 0.8980, 1.0776 and 1.4369 (m/s), respectively. The wear response varied non-linearly with the conditions of loads and sliding speeds. Micro-cutting, plastic deformations, fiber peelings, etc. were included as the possible wear mechanism. The possible correlations between wear and mechanical properties, and throughout discussions for wear behaviors through the morphological analyses of the worn-out surfaces were provided.

Effect of stacking sequence on abrasive wear behavior of abaca natural fiber reinforced polymer composites hybridized with glass fiber

This paper aims to investigate the tribological behavior of Abaca/Glass fiber reinforced epoxy hybrid composite. Different stacking sequences of Abaca(A) and Glass(G) fiber (AAAA, AGAG, AGGA, GAAG) are reinforced with epoxy polymer for fabrication of hybrid composite structure. Dry sliding abrasive wear characteristics of developed composites is analyzed by pin-on-disc (ASTM G99) test rig. The experiment is operated with different sliding velocities (1, 2, 3 m/s), applied load (10, 20, 30 N) and sliding distance of 2000 m. The experimental result indicates abrasive wear resistance is drastically enhanced with the abaca and glass fiber reinforcement in epoxy composite. Furthermore, least wear is found for AGGA hybrid composite. Morphology of worn surfaces were investigated by SEM analysis that indicates formation of micro crater, micro grooves and micro cracks.

Three-Body Abrasive Wear-Resistance Characteristics of a 27Cr-Based 3V-3Mo-3W-3Co Multicomponent White Cast Iron with Different Ti Additions

A multicomponent white cast iron containing 5 wt.% each of Cr, V, Mo, W, and Co (MWCI) is known to have excellent wear-resistance properties due to the precipitation of some very hard carbides, such as MC, M2C, and M7C3. However, it seems possible to improve the wear resistance of MWCI by increasing the carbide volume fraction (CVF). Thus, 27 wt.% Cr based on 3 wt.% each of V, W, Mo, and Co was simultaneously added into the white cast iron. To avoid the tendency of carbides to crack due to high M7C3 precipitation levels, titanium (0–2 wt.% Ti) was also added. A rubber wheel abrasive machine test according to the ASTM G65 standard with two different abrasive particle sizes (average: 75 and 300 μm) was used to evaluate the wear characteristics of the alloy. The results show that the wear resistance of these new alloys (0Ti, 1Ti, and 2Ti) is lower than that of MWCI in small silica sand, owing to the lower hardness. However, a different condition is present in large silica sand, for which the abrasive wear resistance of MWCI is lower than that of the 0Ti and 1Ti specimens. In addition, TiC precipitation effectively refined the size of M7C3 carbides and reduced their cracking tendency. Thus, the wear resistance of 1Ti is comparable to that of 0Ti, although it has a lower hardness factor. However, the wear resistance of the alloy significantly decreased following the addition of Ti by more than 1 wt.% due to the lower hardness and CVF. Therefore, it can be said that the abrasive wear characteristics of the alloy are not only affected by the hardness, but also by the micro-structural constituents (type, size, and volume fraction of carbides) and silica sand size.

High-stress abrasive wear characteristics of ultra-high strength press-hardening steel

Ultra-high strength steels are widely utilized in many applications operating in harsh abrasive wear conditions. For instance, the machineries used in mining and mineral handling or in agricultural sector require robust, but cost-effective wear-resistant materials. Steels provide excellent combination of mechanical properties and usability. This study encompasses mechanical and wear testing of an experimental medium-carbon press-hardening steel. The as-received material was austenitized at two different temperatures and quenched in water. Additionally, low-temperature tempering was applied for one variant. In total, three variants of the press-hardening steel were produced. Microstructural characterization and mechanical testing were conducted for the steel samples. The wear testing was carried out with high-stress abrasive method, in which the samples were rotated inside a crushed granite bed. A commercial 400 HB grade wear-resistant steel was included in the wear testing as a reference. The experimental steel showed very high mechanical properties reaching tensile strength up to 2600 MPa with hardness of 750 HV10. Wear testing resulted in only minimal differences between the three variants indicating that the improved impact toughness by tempering did not significantly affect the wear resistance. The reference steel had nearly two times greater mass loss compared to the higher hardness press-hardening steels. Microhardness measurements on the worn surface showed drastic increase in hardness for the deformed structure for all samples. It was concluded that even the high-hardness martensitic steels exhibit notable wear surface work-hardening. Therefore, hardness was determined to be the most significant factor affecting the wear performance of studied steels.

Mechanical and Three Body Abrasive Wear Behaviour of Nano-Filler Filled, Chopped Glass Fiber Filled Hybrid Composites

Polymer matrix composites are developed for tribological applications due to the possibility of optimizing the properties with the addition of special filler materials as reinforcement. Filler filled polymer matrix composite systems are used in many automotive parts and components like brake pads or clutches which require high coefficient of friction coupled with low wear. However, in most cases it is the primary concern to develop polymer composites that posses low friction and low wear properties under dry sliding conditions against smooth metallic counterparts e.g., gears or bearings, chute liners and coal handling equipments in power plants, gear pumps handling industrial fluids, agricultural machine components. Polymer composites operate in applications where fluid and grease lubricants fail, and have superior tribological performance to traditional polymer composites. Particulate fillers or fibres or solid lubricants have been a part of notable reductions in the wear rate of the polymer matrix at very low loading, and there exists a wide scope on the development of polymer composites on the tribological behaviour. The incorporation of fillers in polymer could provide a synergism in terms of improving mechanical properties and wear performance, which has not been adequately explored so far. The research on nano fillers such as nano clay, Glass fiber and Titanium di-oxide (TiO2) in epoxy system is scarcely reported and further they focus on a few specific issues only. The present study was focused on investigating Mechanical - Tensile, Hardness, and three body abrasive wear characteristics of thermosetting based Epoxy composites and the effect of incorporation of nano clay, TiO2 nanoparticles and chopped glass fiber on microstructure, hardness, friction and abrasive wear are determined and analyzed. The main aim was to investigate the effect of applied load, sliding distance /abrading distance, sliding speed and percentage of filler. The surface morphology of the worn out surfaces were examined using SEM, to get a better understanding of the wear mechanisms.

Enhanced wear and corrosion resistances of AlCoCrFeNi high-entropy alloy coatings via high-speed laser cladding

In this study, an AlCoCrFeNi high-entropy alloy (HEA) coating was prepared on the surface of AISI 1045 steel by high-speed laser cladding (HLC). The microstructure, phase composition, element distribution, microhardness, wear, and corrosion resistance of the coatings were analyzed, respectively. It was found that a metallurgical bond was formed, the mail microstructure were the fine columnar and equiaxed dendrites, and the phase composition of the coating was a single-phase bulk cubic-centered structure (BCC/B2). Moreover, the elements of the HLC coating were evenly distributed without obvious segregation. Compared to conventional laser cladding (CLC), the efficiencies of cladding and processing quality were higher. The scanning speed of CLC was 10 mm/s with some pores and overburning on the surface of the coating. However, the scanning speed of HLC increased by 30 times to 300 mm/s, and the surface roughness of the HLC coating was 39.83% lower. The dilution ratio of the HLC coatings was 4.6%, which was 3 times lower than that of 13.4% by CLC. It also leads to a significant decrease in the grain size, element transition zone, and heat affected zone. As a result, the hardness of the coating increased by 100 HV, the friction coefficient decreased by 0.15, the wear weight loss was reduced by 9.85%, the self-corrosion potential increased by 84 mV, and the self-corrosion current density was one order of magnitude lower. Therefore, the potential application of HLC is suggested to effectively improve the wear and corrosion resistances of HEA coatings. Coatings were prepared by both conventional laser cladding (CLC) and high-speed laser cladding (HLC). The intersection of the laser beam and the powder stream in CLC was on the surface of the substrate, but in HLC it was slightly elevated above the surface of the substrate. Since 65% of the laser energy was used to melt the powder, and only a small amount of laser energy was used to melt the substrate, the area of the coating pools, the heat affected zone, and the dilution rate were reduced. The HLC coating was denser and finer, with consistent dendritic development in the same direction, and its roughness was only 60.17% of that of the CLC coating. Under the same test circumstances, the surface microhardness of the HLC coating rose by 100 HV, while the coefficient of friction and weight loss decreased. Furthermore, abrasive wear characteristics were more obvious. The grain boundaries of the HLC coating were enriched with Ni and Cr, and the area of the passivation film was increased. The passivation tendency of the coating became more evident as the arithmetic mean equilibrium potential increased. • HLC had a scanning speed of 300 mm/s, which was about 30 times faster than CLC. • The surface roughness of the HLC coating was 39.83% lower. • The HLC coating was denser and was also composed of a single-phase BCC/B2 structure. • The microhardness, wear and corrosion resistances of the HLC coating were enhanced. • AlCoCrFeNi HEA coating was mainly strengthened by fine grain strengthening.

Study on microstructure and abrasive behaviors of inconel 718-WC composite coating fabricated by laser directed energy deposition

Additive manufacturing enables the development of high-performance materials by in-situ alloying of multiple components. In this study, Inconel 718-based composite, reinforced with tungsten carbide (WC), was synthesized on a 316L stainless steel substrate using laser directed energy deposition (DED). The microstructural evolution, distribution density of WC particles, and strengthening mechanisms of the DED-processed metal matrix composite (MMC) with different WC particle sizes and ratios are systematically investigated. It illustrated that increasing laser power enables the microstructure transforming from equiaxed to dendritic, which is attributed to the different cooling rates and temperature gradients. In addition, the morphology of the 60% WC ratio of the particle composite shows macrocracks. The incorporation of different sized WC affects retained WC distribution density and tailors a gradient layer around the edge of the WC particle. The in-situ WC-W2C phases precipitated in the deposited layer and the evenly distributed high level of ex-situ retained WC particles induce solid solution strengthening and dispersion strengthening, respectively. As a result, the optimal size of the 90 μm WC/Inconel 718 shows the highest wear resistance. The underlying strengthening mechanisms are elucidated. Consequently, the wear mechanism of Inconel 718-based composite reveals the typical abrasive wear characteristics in the presence of WC particles.

Experimental investigation on three-body abrasive wear behaviour of novel natural cellulosic pigeon pea stalk fibre reinforced epoxy biocomposites

The current research explores the possibility of reinforcing massively available, less utilised, low-cost agro-residue fibres in an epoxy matrix to create a new tribo-material. This study focuses on determining the three-body abrasive wear behaviour (volume loss and specific wear rate (SWR)) of natural cellulosic pigeon pea (PP) stalk fibre reinforced epoxy composites. Further, abrasive wear characteristics of untreated and treated E/PP20 (20 wt.% PP stalk fibre-reinforced epoxy) composites were analysed using Taguchi and ANOVA techniques. Untreated and treated biocomposite specimens were developed using the hand lay-up (open mould) technique. At 11.77 N, 23.54 N, and 47 N loads, the SWR of untreated E/PP20 composite was reduced by almost 5.03%, 3.68%, and 22.30% compared to epoxy specimens. Results of the untreated E/PP20 composite showed that the applied load was the main contributing parameter (54.72%), followed by sliding distance (21.82%) and sliding speed (15.31%). Results of the treated E/PP20 composite showed that the applied load was the main contributing parameter (48.96%), followed by sliding speed (26.24%) and sliding distance (20.78%). The regression model predicted the SWR with a pooled error ranging from 2.37% to −17.77% for untreated composite and 9.87% to −11.49% for treated composite, respectively. The alkali-treated E/PP20 composite exhibited better abrasive resistance than the untreated E/PP20 composite. Scanning electron microscopy images of the treated composites showed good fibre adhesion with the matrix. In addition, the surface of the treated composite showed no fibre pullout or ploughing compared to that of the untreated composite. Surface topography revealed the formation of more craters on the surfaces of the untreated composites and small-sized dispersed craters on the treated composites.

Optimization of Abrasive Wear Characteristics of Polyethylene/Acrylate Copolymer Nanocomposites

Polymer nanocomposites are being used more widely in a variety of industries. As the compatibilizer, Elvaloy-AC-3427 (EAC) was used in addition to Cloisite 30B (C3B) as the reinforcement of filler in this research. For the production of Polyethylene/Cloisite 30B/Elvaloy AC-3427 nanomaterials, a twin-screw extruder is employed. Cloisite 30B was added to the Polyethylene matrix in the range of 2%, 3%, 4%, and 5%. The mechanical and thermal characteristics of the compounds have been examined. Nanocomposites were tested for their tribological properties utilizing abrasive wear load, C3B, and sliding distance which were all taken into consideration while performing the abrasive wear evaluations. Specific wear rate (SWR), coefficient of friction (COF), and weight loss were the abrasive wear test’s output metrics (SWR). For the purpose of enhancing the abrasive wear characteristics, grey relational analysis and grey fuzzy were used. An ANOVA was carried out to examine the connection between input parameters and output variables. Finally, the Polyethylene/Cloisite 30B/Elvaloy AC-3427 nanocomposites abraded wear samples were evaluated microscopically.

Microstructure and properties of ZrB2-SiC continuous gradient coating prepared by high speed laser cladding

A continuous gradient coating was prepared using ZrB2-SiC composite ceramic powder by high speed laser cladding (HSLC) technology on 304 stainless steel. The coating is mainly composed of ZrB2, ZrC, SiC, (Fe, Cr) solid solution and Fe3Si. Microstructure and element exhibit clearly continuous gradient distribution from bottom to top in the coating. The continuous gradient structure gave the coating excellent interfacial bonding and outstanding surface mechanical properties (hardness and wear resistance). The hardness of the coating was as high as1810 HV0.5 at room temperature, and it remained above 1000 HV5 at 800 °C. The coefficient of friction decreased from 0.58 to 0.27 and the wear morphology gradually showed clear characteristics of abrasive, adhesive and oxidative wear with the increasing of temperature.