1,721,299 research outputs found
Contemporary light weight composite material -milestone towards automotive brake rotor application
No full textLightweight materials are significantly replacing heavy materials in the automotive industry in order to compensate weight reduction which in turn translates to energy saving. Efforts by researchers to overcome this limitation give rise to contemporary light weight composite materials which has the potential tribo-mechanical properties to replace automotive tribo-components. Metal matrix composite has the potential weight reduction of approximately 40-55% when compared to cast iron heavy materials. This advantage offers a great flexibility to automotive manufacturers as substitute materials particularly for dynamic loaded components such as brake rotors due to its unsprung mass. In this key note paper, reinforced silicon carbide (SiCp)-aluminium light weight composite material with stir casting fabrication method has been discussed. A strategic conceptual design approach, energy saving model and prototype development have been presented with the milestone towards automotive brake rotor application. The systematic and step-by-step approach of full design has been shown for better understanding of the design concept of automotive brake rotor. The author also highlighted finite element (FE) simulation and actual braking analyses for thermal performance stability whereas actual braking test result using a passenger car (Proton Wira 1.3) brake system rig set up to capture thermal distribution on the brake rotor surface
A systematic literature review
No full textThis presentation shows a systematic journey to write a systematic literature review (LR). This session will help you determine whether you are in the right track to read, write and structuring research materials for your research. The discussion on the requirement for LR, and highlight points on critical assessment and citation of reference sources to consider when do the right literature review for your research. At the end of the session you will be able to walk away with an understanding of the flow of activities you should follow when completing your literature review to continue your ever exciting research in your field of interest
Composite brake rotor: energy savings and wear performance
No full textThe global demand for light weight energy savings and high-performance characteristic material has translated to the emergence of advanced composite materials. Presently, cast iron is used for brake rotor production, however, it has very high-density property which makes the brake disc heavier resulting to more fuel consumption and emission of carbon monoxide (CO) thereby making the environment unsafe. The manufacturing process emits harmful amount of CO2 gas during production. The recyclability of the cast iron is advantageous but the evolution of CO2 during remelting has to be taken into consideration. In this invention, lightweight composite brake rotor is fabricated using a modified stir casting method in order to investigate the energy savings potential and also optimize the wear performance of the aluminium matrix composite (AMC) material integrity. This invention is specifically targeted at the automotive industry for automotive brake rotor application. The aim is to develop an energy saving aluminium composite brake rotor with weight reduction and energy savings in order to replace the existing cast iron material brake rotor without sacrificing wear performance. The new composite brake rotor achieved a 50% weight reduction and a corresponding energy savings of 19% when compared to the existing cast iron brake rotor. Moreover, the wear performance AMC exhibited better lubrication contact which in turn improves the life span of the produc
Particulate composite surface by TIG torch surfacing
No full textThe particulate composite surfaces have been developed in thick surface layers on a low alloy steels by preplacing different ceramic carbide particles into a shallow melt pool produced on a moving sample using traditional TIG torch melting technique. Surface layers ranging in thickness from 0.05 to 1.0 mm are formed, the thickness being determined by the process variables of heat input, particles feed rate and gas flow rate. Typical operating conditions employ TIG input energies, preplaced particle amount, gas flow rate and working distance. The composite surface was investigated by a diversity of techniques, including optical microscopy, scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS), X-ray diffraction (XRD) and Microhardness testing.
This paper discusses the types of surface morphology or structures which have been produced by preplacing ceramic particles on the substrate of low alloy steels and TIG melting/particle injection process (so called re-solidification process) and considers the effect upon these structures developed by different processing parameters which in turn change the mode of dissolution or particle reeling. Special consideration is given to the degree of hardness development on the particulate composite surface after re-solidification via TIG torch melting technique
Hot rolled alloy steel wire rod for pre-stressed steel - Specification
Get PDFThis Malaysian Standard specifies the requirements for hot-rolled steel wire rods for pre-stressing steel bar concrete. This standard is applicable for the manufacture of hot rolled steel wire rods for pre-stressing steel bar concrete (hereinafter referred to as wire rod)
Novel activated Ni-P-hBN composite powder for efficient solid lubricant coating application
No full textAs new technologies evolve, new demands are created for protective coatings which are required to have stability over a range of quite aggressive service conditions. For instance, the surfaces of shafts, bearings and steam turbine blades for use in turbine engines are to be protected against daunting effect of high-temperature dry sliding wear. Under this condition, conventional liquid lubrication is inadequate due to the limitation on the temperature at which the liquid lubricant can be used; moreover, most of the materials for unlubricated hard coatings such as TiC ceramics are not suitable for dry sliding applications due to their high friction coefficient and wear rate. In order to meet the requirement of extreme and demanding tribological applications, high- performance wear resistant composite coating with outstanding self-lubricating properties have been developed in this new innovation based on the advanced lubrication concept of combining hard TiC and soft reinforcement phase of hexagonal boron nitride (hBN). hBN is a well known effective solid lubricant for high-temperature application. Due to the challenge of its non-wettability with most metal-ceramic matrices, a novel electroless plating technique was developed by the innovators to coat the surface of hBN with thin layer of Nickel-Phosphorous (Ni-P) deposits which has been patented recently. Finally, a cheaper powder preplacement and tungsten inert gas (TIG) arc torch method was employed to consolidate the newly developed composite hBN powder particles in the near-surface region of AISI 4340 low alloy steel (LAS). Laboratory tests were carried out to assess the tribological performance of the developed TiC/Ni-P-hBN hybrid composite coated steel as compared to TiC and TiC/hBN coatings. The tribological assessments of the new composite coated steel product exhibitted an improved performance in term of microstructural integrity or morphology and stable frictional control at high temperature
- …
