Papers by Keyword: B₄C

Abstract: In the aerospace industry, titanium and its alloys have garnered significant attention for their low density, rendering them highly desirable materials. Nonetheless, their wear resistance has posed challenges, prompting extensive research into titanium-based composite materials. This study investigates the tribological performance of various titanium-based metal specimens reinforced with distinct ceramic and intermetallic materials. Specifically, specimens were fabricated to include a 20% volume fraction of pre-alloyed TiAl intermetallics, renowned for their reduced density, while others incorporated 30% boron carbide (B₄C). All specimens were meticulously prepared using Inductive Hot Pressing under optimized conditions. The primary objective is to discern the most effective option in terms of wear resistance. Comprehensive analyses, encompassing mass loss measurements, track width evaluations, wear assessments, and friction coefficient analyses, were conducted to achieve this goal.

Abstract: The optimal modes (temperature, time, pressure force) of spark plasma sintering (SPS) and hot pressing of boron carbide obtained by various methods are determined. The initial powders were obtained from soot and amorphous boron by the mechanochemical synthesis method, by the high-temperature synthesis (SHS) method and by the carbon reduction method. The structure and the properties of SPS sintered and hot-pressed boron carbide blanks were determined. The highest value of the relative density was achieved during SPS sintering of blanks from B₄C powders obtained by mechanosynthesis and SHS methods. It was found out the optimal conditions for sintering blanks from B₄C powder obtained by mechanosynthesis. The density value reaches 99.0 rel.% at 1500 °C/25 MPa and sintering time of 45 min. For powders obtained by the SHS method, the density of sintered blanks is 98.5 rel.%. at 1800 °C/30 MPa with sintering time of 45 min. The highest value of the relative density was achieved during the hot pressing of blanks from B₄C powders obtained by mechanosynthesis.

Abstract: The current paper deals about the fabrication of composite material is to combine the desirable attributes of metals and ceramics. Aluminium 6063 used as a base material in combination with the Silicon carbide ,Boron carbide and fly-ash were used as reinforcement material. Our intention is to increased or enhanced properties of pure Aluminium 6063 by addition of Silicon Carbide ,Boron Carbide and fly-ash. The process of fabrication composite material is prepared by using stir casting method. In this paper, addition of Silicon Carbide 1% , Boron Carbide 1% and fly-ash1% with aluminium increasing percentage ratio the mechanical properties of composite material is enhanced, so it is clear that the effect of Silicon Carbide , Boron Carbide and fly-ash were helpful to increasing properties of pure Aluminium by addition. The influence of reinforced ratio of silicon carbide, Boron carbide and fly-ash particles on mechanical behavior was examined. The effect of different weight percentage of silicon carbide, Boron carbide and fly-ash in composite on tensile strength, hardness, microstructure was studied. It was observed that the hardness & tensile strength of the composites increased with increasing reinforcement elements addition in it. The distribution of silicon carbide, Boron carbide and fly-ash particles was uniform in aluminum.

Abstract: In the present scenario, the automobile industry, and aerospace industries are considerable scuffles to strive for innovative lightweight materials among manufacturing industries. They preserve their place by reducing the cost of their products and services. For this tenacity, the demand for lightweight material, low cost, and high-performance material are needed. Aluminum matrix composite is developed to fulfill and becomes an engineer’s material. Aerospace & Automobile industries are eager to introducing compound aluminum metal matrix composites due to their excellent mechanical & tribological properties which makes a reduction in the weight of the component. In this project the LM13 as the matrix material while SiC and B₄C have been considered as dual reinforcement. Stir casting is the modest and inexpensive method of fabricating an aluminum matrix composite. For the Evaluation of Mechanical &Tribological behavior of DRP composite castings (LM13/B₄C/SiC) selection for experimentation tests. In this paper different specimens of the MMC with LM13 Al Alloy 2wt% SiC and 2wt% B₄C, 2wt% SiC and 4% B₄C, 4wt% SiC, 2wt% B₄C, 4wt% SiC and 4wt% B₄C are taken for carried to invention out the increase in DRP in the composites will intensification the mechanical properties of the LM13 Al Alloy SiC and B₄ C composite formed.

Abstract: The article describes the preparation and comparative wear resistance testing Fe-Cr-C- (B) coating materials, intended to harden the working bodies of agricultural machines, using high-performance method of inductive surfacing, and contains the results of microstructure analysis of such coatings. These coatings are made of powder compositions, based on PG-US25 high-chromium cast iron, and borate flux for inductive surfacing of P-0.66 grade, modified with W, B, Cr carbides in amounts from 2...5 to 25...30 wt.%, which can be applied to machine’s elements without significant technology changes. Modifying agents were commercial products (WC-W₂C / Co spherical cast tungsten carbide, B₄C abraser). The article demonstrates that the injection of these complexes into the fusion mixture for inductive surfacing can increase their hardness (up to 1000...1200 HV₁₀₀) and wear resistance of the surfacing metal 3.1...4.5 times, compared to the base metal (65G steel), and 1.3...1.8 times, compared to the base material. The observed changes in coatings characteristics are explained by Charpy effect, dispersion hardening and the formation of new phases in the coatings (boride eutectics).

Abstract: In this paper, the modified phenolic resin-based adhesive was prepared by dissolving different components. After low temperature curing, SiC samples were bonded by the binder. The samples were treated at different temperatures (400°C, 800°C, 1200°C, 1500°C) under an inert atmosphere. The bonding strength of samples was tested after heat treatment at room temperature. The results showed that the bonding strength of the B₄C modified phenolic resin (PF) based adhesive is the highest. When the heat treatment temperature was above 1200°C, the bond strength increased with the additive amount of boron carbide at room temperature. The microstructures of the samples were observed by optical microscope and scanning electron microscope. The effects of the modified filler and heat treatment temperature on the bonding strength of the phenolic resin based adhesive were investigated. The bonding strength of boron carbide-modified phenolic resin-based binder was tested under high temperature. It was found that the bond strength at high temperature was lower than that at room temperature, and the bond strength decreased with the increase of temperature.

Abstract: In the present paper aluminum matrix composites were fabricated using base material AA6082-T6. SiC and B₄C particulates were used as reinforcement to obtain hybrid and non-hybrid composites through the conventional stir casting process. AA6082-T6/SiC composites with 5, 10, 15 and 20 wt % of SiC; AA6082-T6/B₄C composites with 5, 10, 15 and 20 wt % of B₄C and AA6082-T6/(SiC+B₄C) hybrid composites with 5, 10, 15 and 20 wt % of (SiC+B₄C) taking equal fraction of SiC and B₄C were made and the microstructure study was carried out. X-Ray diffraction (XRD) patterns revels the presence of reinforcement within the matrix along with some other compounds. The microstructure of the fabricated composites was examined with the help of Scanning electron microscope (SEM) and the micrographs revealed that the dispersion of reinforced particles was reasonably uniform at all weight percentages.

Abstract: The thermal conduction behavior of the neutron absorbing ceramic boron carbide in the initial stage of the irradiation was analyzed and a classical thermal conduction model was used to estimate the variation of the thermal conductivity in this paper. The calculated thermal conductivity using the model shows a large degration in the initial stage of irradiation. As the burnup increases, the thermal conductivity turns to be free of temperature dependence. These calculated results are consistent well with the expermental data of thermal conductivity of the irradiated boron carbide, which may suggest that the variation of the thermal conductivity of boron carbide is predominantly determined by the point defects scattering in the initial stage of irradiation.

Abstract: Powder metallurgy is a popular technique to synthesize metal matrix composites with uniform distribution of the reinforcements. The present work aims to synthesize Al-B₄C composites through powder metallurgy route and study their properties. The compositions of the composites are Al-5%B₄C, Al-10%B₄C & Al-15%B₄C. Blending of powders, compaction and sintering process were carried out as per standard powder metallurgy procedure. The distributions of the reinforcements were analyzed for the sintered specimens by the help of scanning electron microscope. The effect addition of B₄C in the Aluminium matrix on the properties such as density, porosity, hardness and compressive strength were discussed. Results show that addition of B₄C improves the properties of Al-B₄C composites.

Abstract: According to the theory of meso-structure design, milling powders were blended with un-milled Al particulate to increase ductility. Two kinds of Al particulate-toughened composites were fabricated by using powder metallurgy method, where the mass fraction of B₄C in the B₄C-Al agglomerate particles was 40%, but 32% and 16% in the whole composite. The microstructure of composites was examined by scanning electron microscope (SEM), and its mechanical properties were studied. The results indicate that Al particulate-toughened sample has a slight plasticity with bulks of aluminum alloy in the composite. But meso-structure design has no effect on improvement on the plasticity and toughness of the sample B₄C-Al/Al (16%)(3^#), where the mass fraction of B4C in the whole composite is 16%. In the present study, the strengthening and deformation mechanism of the composites were also discussed.