Addition Of Silicon Carbide Particles Research Articles

The Effect of SiC Addition on AlNi Compact Mechanical Properties Produced Via Powder Metallurgy

This research directed to produce Al-Ni alloys by powder metallurgy technique since of its marketable and industrial significant. Nickel and aluminum powders were determined their particle size then the powders mixed and blended with percent (Al - 20% Ni). Silicon carbide particles (SiC) powder supplemented to master alloy powder by percent (4-6- and 8 wt. %) separately then these powders mixed to obtain homogeneous distribution, then the powders compacted in cold pressure at 700 MPa. The sintering procedure was performed at (530°C) for 8 hrs. At vacuum atmosphere (10-4 torr). After cooling these samples grinded and polished to estimate microstructure, density, porosity, LOM, SEM, EDS, X-ray diffraction ,hardness and wear tests at dissimilar circumstances. Results showed that the hardness increased by (52%) and wear rate decreased by (55%) at 8 wt % silicon carbide addition, and it was the best results.

Evaluation of Mechanical, Microstructure and Sliding Wear Characteristics of Different Al-Zn Alloy and Composite: A Comparative Research

Plain bearings are extensively used in many engineering application. The wear loss of bearing material is the one of the major parameter that affects the performance of bearing. In this investigation, four Al-25Zn alloy samples reinforced with silicon carbide and graphite content were fabricated using stir casting technique. The mechanical properties, microstructure and sliding wear characteristics of fabricated specimens were studied. Dry sliding wear characteristic of specimens was investigated using a pin on disc tribometer with EN24 shaft steel disc at three speeds 1.0472m/s, 2.0944m/s and 3.1416m/s and three different applied pressures 0.3747MPa, 0.7584MPa and 1.1421MPa as per Taguchi L9 orthogonal array. The microstructure examinations of the worn surfaces were carried out using a scanning electron microscope (SEM). The hardness, tensile strength and wear resistance of Al-25Zn alloy with the addition of silicon carbide particles is found to be increased. The addition of graphite particles in Al-25Zn alloy enhances the wear resistance and tensile strength of the composite, in spite of the substantial decrease of hardness. The worn surfaces show the presence of delamination and abrasive wear mechanisms in the localized region.

Influence of Non-Metallic Particles Addition on Wettability, Intermetallic Compound Formation and Microhardness of Sn-0.7Cu Lead Free Solder Paste

A non metallic reinforcement has attracted most of the worldwide researchers to enhance solder performance. Silicon carbide (SiC) particle is a semiconductor which had been used as a non metallic reinforcement in this research study.The fabrication of Sn-0.7Cu lead free solder paste was done by mixing the solder powder with flux. Then, Sn-0.7Cu/SiC composite solder paste was prepared by mixing solder powder, flux and various weight percentage (wt%) of SiC. The amount of SiC particles added was 0, 0.25, 0.50, 0.75 and 1.0 wt%. The influence of SiC addition was analyzed based on its wettability, IMC layer formation and microhardness properties. The addition of SiC particles had decreased the contact angle as well as thinner the IMC layer. The morphology of IMC layer changed from scallop like shape to combination of scallop and planar like shape with the addition of SiC particle. Apart from that, the microhardness was enhanced with addition of SiC particle into Sn-0.7Cu lead free solder paste.

Enhancement of Microstructural and Physical Properties of Sn-0.7Cu Lead-Free Solder with the Addition of SiC Particles

Nowadays, composite solder has gained researcher’s attention due to its promising improvement in physical and mechanical properties for lead-free solder. To improve the properties of Sn-0.7Cu (SnCu): the promising lead-free candidate, addition of silicon carbide (SiC) as a reinforcement was used into this study. However, its limitation on solderability as compared with SnAgCu (SAC) make it not an attractive alternative lead-free solder. This study was carried out to investigate the effect of SiC particle on microstructure evolution and physical properties of SnCu based solder alloys. SnCu-SiC composite solders were synthesized by powder metallurgy method (PM), which consists of several processes such as mechanical blending, compaction and sintering. Five different weight percentages of SiC particle; 0.00, 0.25, 0.50, 0.75 and 1.00 were mechanically blended with SnCu lead-free solder. The result shows that the addition of SiC particle has decreased the β-Sn area and refined the microstructure of composite solder. In addition, the improvement in microhardness of composite was achieved.

Mechanical behaviour of fly ash/SiC particles reinforced Al-Zn alloy-based metal matrix composites fabricated by stir casting method

In the present work Al-Zn/fly ash/SiC reinforced composites are fabricated through vortex method using stir casting route. Fly ash is abundantly available in thermal power plants which is considered to be a major industrial waste. This paper reports the microstructural evaluation and mechanical behaviour of aluminium-zinc alloy reinforced with fly ash and silicon carbide (SiC) has been investigated. Composites reinforced with fly ash and SiC in different weight percentages varying from 0 -10wt percentage with a particle size of 53μm were prepared. The prepared composites were characterized using optical microscope, scanning electron microscope (SEM), Electron back scattered diffraction(EBSD) and tensile testing machine. The microstructural studies revealed the presence of fly ash and SiC particulates and are distributed uniformly throughout the matrix whereas the grainsize refinement is observed in EBSD analysis. The incorporation of fly ash particles enhanced the hardness and tensile properties like ultimate tensile and yield strengths were improved by the addition of SiC particles. The strengthening mechanisms were discussed for the improved properties.

Dynamic mechanical properties and constitutive relationship of particle-reinforced AZ91D composites

The flow stress behavior of 10 vol % silicon carbide particulate reinforced AZ91D composites was investigated by compression tests. The addition of silicon carbide particles improves the strength of the composites enormously, three main mechanisms account for this behavior. Positive strain rate effect on yield strength under dynamic compression is available, and the mechanisms for strain rate sensitivity is analyzed. The adiabatic temperature rise converted from plastic deformation work at various strain rates is calculated, and the modified J-C model is employed to characterize the flow stress curves.

Influence of a few important parameters on the rheological behaviour of silicon carbide nanoparticles dispersed aqueous suspension

In this study, investigations have been carried out on the effect of a few important parameters such as molecular weight and concentration of dispersant (polyethyleneimine) as well as that of pH on the rheological behaviour of aqueous suspension comprising silicon carbide (SiC) nanoparticles. In addition to this, the effect of particle size and addition of finer SiC particles on the rheological behaviour of SiC suspension have been examined. It is observed that viscosity of suspension increases with the increase in molecular weight of dispersant and decreases as the concentration of dispersant increases. Further, it is noticed that viscosity of the suspension progressively increases below the pH ≈ 7.6 and above the pH ≈ 9.3, indicating that minimum viscosity i.e. maximum stabilization of suspension is obtained within the pH range of ≈ 7.6–9.3. It has been observed that variation of SiC particle size from submicrometer to nanometer range and addition of nanometric SiC powder in SiC suspension containing coarser particles increase the viscosity significantly.

Influence of Sic on Mechanical, Thermal, Fire and Wear Studies of Vinylester/Glass Fibre Composites

The objective of this current study was to examine the effect of Silicon Carbide (SiC) content in the glass fibre-reinforced vinylester composites. The 5 to 15 wt.% SiC dispersed vinylester/glass composite were fabricated using wet hand lay-up process. The tensile, flexural and impact properties were increased by the addition of SiC up to 10 wt.%. Results show that the addition of SiC particles increases modulus and strength, but reduces toughness. The enhancement in strength for composites was attributed to good interfacial adhesion and good degree of dispersion. The abrasive wear behavior of SiC filled vinylester/glass composite has been studied. The fire retardation properties increased with increase in the SiC loading. Dry sand/rubber wheel abrasion tests (RWAT) were carried out at 100 rpm test speed. The tests were carried out at 24 and 48 N loads by varying the abrading distance from 250, 500 and 750 mm. Experimental results of abrasive wear tests revealed that wear of composite was sensitive to variations of abrading distance and less sensitive to sliding velocity. The tensile fractured and worn surfaces were examined using scanning electron microscopy (SEM).

Effect of Copper Coated SiC Reinforcements on Microstructure, Mechanical Properties and Wear of Aluminium Composites

Experimental investigations are carried out to study the influence of copper coated Silicon carbide (SiC) reinforcements in Aluminum (Al) based Al-SiC composites. Wear behavior and mechanical Properties like, ultimate tensile strength (UTS) and hardness are studied in the present work. Experimental results clearly revealed that, an addition of SiC particles (5, 10 and 15 Wt %) has lead in the improvement of hardness and ultimate tensile strength. Al-SiC composites containing the Copper coated SiC reinforcements showed better improvement in mechanical properties compared to uncoated ones. Characterization of Al-SiC composites are carried out using optical photomicrography and SEM analysis. Wear tests are carried out to study the effects of composition and normal pressure using Pin-On Disc wear testing machine. Results suggested that, wear rate decreases with increasing SiC composition, further an improvement in wear resistance is observed with copper coated SiC reinforcements in the Al-SiC metal matrix composites (MMC’s).

Effects of ceramic particle size on microstructure and the corrosion behavior of cold sprayed SiCp/Al 5056 composite coatings

An Al 5056 alloy coating and Al 5056 based composite coatings reinforced with silicon carbide (SiC) particles were produced by cold spray technology. The microstructure was observed by different methods, from the coating surface through the cross sections to the interface. Attention was paid to key parameters governing the corrosion resistance of coatings: porosity, surface roughness, interface morphology and distribution of ceramic particles. The addition of SiC particles resulted in denser coating, homogeneous distribution of reinforcement phase and modified coating surface roughness and interface morphology. Corrosion behavior was studied by electrochemical measurements and corrosion resistance was also tested by long-term immersion. Results showed that the cold sprayed Al 5056 coating and SiCp/Al 5056 composite coatings provided cathodic protection for an aluminum substrate. SiCp/Al 5056 composite coatings showed better corrosion resistance than Al 5056 coating. Greater spraying efficiency and the best corrosion resistance were obtained with SiCp particles size close to 20μm.

Effect of SiC Particles Addition on the Wettability and Intermetallic Compound Layer Formation of Sn-Cu-Ni (SN100C) Solder Paste

The effects of SiC on wettability and intermetallic compound (IMC) formation of Sn-Cu-Ni solder paste composite were systematically investigated. Lead-free solder paste composite was produced by mixing silicon carbide (SiC) particle with Sn-Cu-Ni (SN100C) solder paste. The wettability of composite solder was studied by observing the contact angle between solder and copper substrate. The IMC phase formation on copper substrate interface was identified using X-ray diffraction (XRD). The phase as detected in the composite solder is Cu6Sn5.The wettability of composite solder was observed through contact angle between solder and copper substrate and Sn-Cu-Ni + 1.0 wt.% SiC shows improvements in wetting angle and suppresses the IMCs formation.

Effect of inclusion of SiC particulates on the mechanical resistance behaviour of stir-cast AA6063/SiC composites

This study investigates the mechanical resistance behaviour of AA6063 particulate composites with the inclusion of micron-sized silicon carbide (SiC) particles with different weight percentages in an AA6063 aluminium matrix. AA6063/SiC particulate composites containing 0, 5, 10, and 15 weight percent of SiC particles were produced by stir casting. Standard mechanical tests were conducted on the composite plates, and the mechanical resistance to indentation, tensile force and sliding force are evaluated. It has been observed that upon addition of SiC particles, the resistance against indentation is increased and the resistance against tensile force is initially increased and then decreased. Furthermore, using scanning electron microscopy (SEM), the fracture appearance of the broken specimen subjected to tensile force and morphological changes in the surface subjected to sliding force are analysed. The SEM images reveal that the addition of SiC particles in the AA6063 aluminium matrix initiates more cleavage facets. This leads to brittle fracture in the specimen subjected to tensile forces and less transition from material displacement to material removal in the specimen subjected to sliding forces.

Microstructure Researches of Metallic Composite Foams Based on AlMg Alloys

Composite materials are the most advanced class of materials invented and produced by humans in modern times as well as a challenge for the future in the field of scientific and technological performance. They are made up of at least two phases of different nature which are so combined to form a new material with a superior combination of properties. They are generally materials with unusual performances on the relationship between properties and specific gravity. Composites are multiphase materials with distinct and well-defined interface between the constituent phases ensuring a transfer of property but can lead to obtaining a product with exceptional performance from the starting material. In this paper we have focused research on Al-Mg alloys with magnesium and silicon carbide (SiC). Stabilized Aluminium Foams (SAF) are new class of materials with low densities and novel physical, mechanical, thermal, electrical and acoustic properties. They offer potential for lightweight structures, for energy absorption, and for thermal management; and some of them, at least, are cheap. Metal foams offer significant performance gains in light, stiff structures, for the efficient absorption of energy, for thermal management and perhaps for acoustic control and other, more specialized, applications. They are recyclable and nontoxic. They hold particular promise for market penetration in applications in which several of these features are exploited simultaneously. The paper presents some results related to the research of metallic foams based on AlMg10 metallic alloy obtained by melt bubbled C4H10 addition of SiC particles. Microsrtucture of these foams is analyzed by using (SEM) Scanning Electron Microscope, laying out the network of pores imbued into each others developed around SiC particles and other issues microstructural characteristics.

Microstructure and corrosion behavior of cold sprayed SiCp/Al 5056 composite coatings

Al 5056 composite coatings reinforced with silicon carbide (SiC) particles were deposited by cold spraying. The influence of fraction of ceramic particles on microstructure and corrosion behavior was evaluated. The results show that the addition of SiC particles yields coatings with lower porosity than Al 5056 coating. Quantitative analysis of 3-D optical microscopy images reveals that the maximum size of the embedded pores increases with the fraction of SiC particles. The corrosion performances of coatings were evaluated by open circuit potential measurements and potentiodynamic polarization scans in 0.1M sodium sulfate solution with pH fixed at 11.5. The OCP values of coatings were much lower compared to pure Al plate. Compared to pure Al plate, the anodic parts of the polarization curves of the coatings show a similar trend; however, the current densities of the coatings evaluated at an overpotential value of +600mV (Ioverp) were higher. The addition of SiC particles reduced Ioverp in comparison with Al 5056 coating. Nevertheless, the volume fraction of SiC in feedstock has no significant effect on the anodic polarization behavior. Since all the coatings are dense with a porosity lower than 2.5% and containing no interconnected porosity, thickness and porosity did not affect the corrosion behavior.

Effect of SiC addition on mechanical and wear characteristics of WC-32(W-Ti)C-6Co cemented carbides

The effect of silicon carbide (SiC) addition on mechanical and wear properties of cemented carbides was investigated in this study. Different percentages (1-7 wt. %) of SiC were added to the cemented carbides mixture of WC/32 wt. % (Ti–W) C/6 wt. % Co. The microstructural characteristics of the developed materials was identified using scanning electron microscopy (SEM) and Rockwell–A macrohardness (HRA), Vickers microhardness (Hv) as well as transverse rupture strength (TRS) were measured. The experimental results revealed that inserting SiC inclusion into the cemented carbides is found to be useless for two reasons. First, the microstructure of the developed carbides has more aggregations of largely contiguous SiC grains led to presence of rich/poor regions and consequently poor compatibility between carbides and the binder. Second, all properties of the cemented carbides greatly declined with the addition of SiC particles.

Thermal shock behavior of nano-sized SiC particulate reinforced AlON composites

Aluminum oxynitride (AlON) has been considered as a potential ceramic material for high-performance structural and advanced refractory applications. Thermal shock resistance is a major concern and an important performance index of high-temperature ceramics. While silicon carbide (SiC) particles have been proven to improve mechanical properties of AlON ceramic, the high-temperature thermal shock behavior was unknown. The aim of this investigation was to identify the thermal shock resistance and underlying mechanisms of AlON ceramic and 8 wt% SiC–AlON composites over a temperature range between 175 °C and 275 °C. The residual strength and Young's modulus after thermal shock decreased with increasing quenching temperature and thermal shock times due to large temperature gradients and thermal stresses caused by abrupt water-quenching. A linear relationship between the residual strength and thermal shock times was observed in both pure AlON and SiC–AlON composites. The addition of nano-sized SiC particles increased both residual strength and critical temperature from 200 °C in the monolithic AlON to 225 °C in the SiC–AlON composites due to the toughening effect, the lower coefficient of thermal expansion and higher thermal conductivity of SiC. The enhancement of the thermal shock resistance in the SiC–AlON composites was directly related to the change of fracture mode from intergranular cracking along with cleavage-type fracture in the AlON to a rougher fracture surface with ridge-like characteristics, crack deflection, and crack branching in the SiC–AlON composites.

Effect of SiCp as Reinforcement on the Corrosion Behavior of Cast Al-Mg Matrix

Metal matrix composite (MMC) are engineered materials manufactured by the action of incorporated reinforcement materials into metal matrix. As a result, stiff and hardened reinforcing phase in metallic matrix is obtained. The matrix includes a wider range of non-ferrous structures; meanwhile reinforcing phases comprise hardened nonmetallic particulates. The purpose of this paper is to investigate microstructural and electrochemical behavior of Al-Mg matrix reinforced with SiC particles (SiCp). The aluminum metal matrix composite was manufactured by the foundry vortex method. In the vortex process, SiC particles mixed into steel tubes at 1500 rpm were added to molten Al-Mg as-cast alloy. The metal-matrix composite (MMC) was characterized with the purpose of studying chemical interactions of SiC particles with the metal-matrix and its respective effect in electrochemical behavior. Results show that anodic dissolution in the cast Al-Mg matrix was accelerated by the formation of a non-stable oxide layer exhibiting partial protection with small resistance to polarization conditions, while the corrosion phenomena in Al-MMC was inhibited by the addition of silicon carbide particles

Effect of SiC additions on microstructure, mechanical properties and thermal shock behaviour of alumina–mullite–zirconia composites

Abstract This paper describes the effect of additions of silicon carbide (SiC) particles on density, microstructure, mechanical properties and thermal shock behaviour of slip-cast alumina–mullite–zirconia composites. Alumina, zircon and SiC powders were used to prepare highly concentrated (51 vol.% loading) and stable aqueous suspensions by using Dolapix dispersant (0.5 wt.%). The sintering process was carried out in two stages, first at 1600 °C and then 1500 °C, with 2 and 5 h holding, respectively. Densities and thermal shock properties as well as strength, toughness and hardnessof the prepared composites were evaluated. Two-stage sintering process of alumina–mullite–zirconia–SiC (AMZS) composites led to a remarkable grain size reduction and an increase of density. The maximum value of fracture toughness and minimum value of grain size were obtained by using 20 vol.% silicon carbide. Results showed that the addition of SiC particles (20 vol.%) improved the thermal shock resistance (Δ T = 1000 °C) of alumina–mullite–zirconia composites even after 10 heating cycles.

Electroless copper-phosphorus coatings with the addition of silicon carbide (SiC) particles

Cu-P-silicon carbide (SiC) composite coatings were deposited by means of electroless plating. The effects of pH values, temperature, and different concentrations of sodium hypophosphite (NaH2PO2·H2O), nickel sulfate (NiSO4·6H2O), sodium citrate (C6H5Na3O7·2H2O) and SiC on the deposition rate and coating compositions were evaluated, and the bath formulation for Cu-P-SiC composite coatings was optimised. The coating compositions were determined using energy-dispersive X-ray analysis (EDX). The corresponding optimal operating parameters for depositing Cu-P-SiC are as follows: pH 9; temperature, 90°C; NaH2PO2·H2O concentration, 125 g/L; NiSO4·6H2O concentration, 3.125 g/L; SiC concentration, 5 g/L; and C6H5Na3O7·2H2O concentration, 50 g/L. The surface morphology of the coatings analysed by scanning electron microscopy (SEM) shows that Cu particles are uniformly distributed. The hardness and wear resistance of Cu-P composite coatings are improved with the addition of SiC particles and increase with the increase of SiC content.

Oxidation behaviour of nano-sized SiC particulate reinforced Alon composites

Silicon carbide (SiC)–aluminium oxynitride (Alon) ceramic composites exhibited improved mechanical properties, but the high temperature oxidation behaviour was unknown. The aim of this investigation was to identify oxidation characteristics and kinetics of 8 wt% SiC–Alon composites over a temperature range between 700 °C and 1200 °C in air. The Alon matrix and SiC particles near the surface were oxidized to form Al 2O 3 and SiO 2, respectively. The starting oxidation temperature of Alon was observed to be about 1000 °C. While the addition of nano-sized SiC particles resulted in a reduced starting oxidation temperature due to the large cumulative surface area and high total surface energy, the oxidation resistance at higher temperatures of 1100 °C and 1200 °C was remarkably enhanced. The oxidation kinetics changed from a linear weight gain for pure Alon into a logarithmic weight gain for the composites due to the formation of a dense protective oxidation layer arising from the presence of SiO 2.