Differences And Characteristics Of Aluminum-Graphite Consites

Great Essays
III. RESULTS AND DISCUSSIONS:
A. Characteristics of Aluminum-Graphite composites and the in-situ reaction
To examine the reaction condition of carbon flakes and Al powders, 4 wt. % carbon flakes were added to Al powders.
Fig. 1 shows the DSC plot obtained during heating and cooling of the green compact from room temperature to 750 0C and from 750 0C to room temperature at a heating/cooling rate of 3
0C /min under argon gas atmosphere. From the DSC heating curve it is evident that the total amount of heat absorbed during melting of Al-Gr is significantly the same as heat liberated during solidification. The small endothermic peak observed at 252.5 0C in the heating curve is attributed to the formation of silicon carbide (SiC). And also graphite
…show more content…
The development of SiC phase for 2, 3 and 4.0 wt. % C can be formed during hot extrusion process.
Fig. 2. XRD patterns of Al-Gr powders
Fig. 3. XRD patterns Al-Gr composite
This is also in good agreement with endothermic peak at 252.5
◦C observed in DSC of figure 2 and shown in SEM micrographs of Figure 4. The Presence of SiC as indicated in the XRD pattern confirms the feasibility of the in-situ reaction of silicon and carbon. The initiation temperature of this endothermic reaction with conventional micron sized SiC powder is usually carried out at relatively high temperature
(500 ◦C or 600◦C) [22, 23]. The low temperature of 252.5 ◦C observed in the present study is attributed to application of hot extrusion. The die pressure of extrusion enhanced the overall kinetic conditions and reaction rate of the in-situ reaction process at low temperature. Representative SEM micrographs of the composite with 3wt. % C prepared by compact and hot extrusion held at 500 ◦C are illustrated in Fig. 4. The microstructural feature of the composite reveals the presence of graphite and fine particles of SiC (less than 1 μm) that are uniformly distributed in aluminum matrix. XRD and
…show more content…
There was little evidence of plastic deformation, which results from a great graphite smeared filled more than other.
Fig. 9 a,b: Microstructure of Al micro-graphite composite 1,2 wt% respectively at sliding speed 1200 m, at contact load 40 N
Fig.10 a,b: shows the worn out surface of the micro-graphite content at 3,4 wt% respectively composites.
Fig. 10 shows the worn surface morphology of the composites containing different amounts of graphite particles tested under dry sliding conditions. The worn surface of Al–3 wt. % graphite is covered with a black film and the grooves are smaller in comparison to the Al–1 wt.% graphite and are filled with debris particles. Fig. 10b clearly shows that for Al 4 wt.
% graphite, the smeared layer becomes thicker and denser due to the increased graphite content. In fact, after wear test of this composite, most of the worn surface is covered uniformly by the graphite lubricating film which can prevent direct contact between the pin and the counterface. It has been found that the thickness of the graphite rich layer at the sliding surface plays an important role in the wear behavior of composites [24].

Related Documents

  • Improved Essays

    Pig Iron Research Paper

    • 334 Words
    • 2 Pages

    (1) Basic Substance. The basic substance used to make both steel and cast iron (gray and malleable) is the metal, iron in the form of pig iron. Pig iron is produced from iron ore, which occurs chiefly in nature as an oxide, the two most important oxides being hematite and magnetite. (2) Iron Ore. Iron ore is reduced to pig iron in a blast furnace, and the impurities are removed in the form of slag (figure 2 on the following page).…

    • 334 Words
    • 2 Pages
    Improved Essays
  • Improved Essays

    This is readily apparent when you survey the many aluminum containers for products found throughout your local supermarket. This metal has a great future in a world that is looking to become as green as possible. If you are a design engineer, you should consider the possibilities of using aluminum. If you are a consumer, keep your eye out for aluminum products, and always remember, all of your aluminum can be…

    • 430 Words
    • 2 Pages
    Improved Essays
  • Improved Essays

    Alloy Bat Research Paper

    • 631 Words
    • 3 Pages

    What makes a bat worth buying? Colleges and scientists continue to research and hypothesize on many topics. The experimenters test different types of bats such as alloy and composite. Many different factors come into play when developing reviews. For instance, experts are able to examine performance levels, materials, and price.…

    • 631 Words
    • 3 Pages
    Improved Essays
  • Improved Essays

    Fluoride is one of the most toxic substances known to humans. The substance is made up of a salt of hydrofluoric acid consisting of two elements, one of which is fluorine. You may have heard of this toxic acid, that is because it is commonly used at dentist offices. Fluoride is used by dentists to clean bacteria off your teeth and reduce tooth decay. Studies have shown that for years, the government has been poisoning the public water supply without citizens explicit consent.…

    • 641 Words
    • 3 Pages
    Improved Essays
  • Improved Essays

    Recyclized Time and effort Green building product Lightweight Strength Aluminum is easily moldable and elastic. Steel is not moldable or elastic but it is very tough and resilient. But yet steel, carbon steel is stronger than aluminum because of the weight and the thickness of the steel.…

    • 651 Words
    • 3 Pages
    Improved Essays
  • Decent Essays

    Palmyra / glass/ polyester have 60 KJ/m2 . It is 50% higher than PPLSF/CRF- polyester composite. The same result has observed Palmyra /glass/ Polyester[17], Curuva / Glass / Polyester[16], Coir / Jute / polyester[23] composite. Finally a negative hybrid effect obtained in impact…

    • 471 Words
    • 2 Pages
    Decent Essays
  • Improved Essays

    The purpose of this experiment has been met and all heat changes in each part of the experiment were measured. In Part I we had to calculate the specific heat (SH) and the atomic mass of a metal. In this case, Copper was examined and the specific heat of Copper was calculated to be 0.262 J/g℃, even though the actual specific heat is 0.387 J/g℃. The percent error of that calculation is 32.299%. A considerable reason for this error is inaccurately reading the thermometer to the tenth degree digit (0.1℃).…

    • 797 Words
    • 4 Pages
    Improved Essays
  • Decent Essays

    What Is Lithium?

    • 288 Words
    • 2 Pages

    Lithium is an element with the atomic number 3 on the periodic table. Its atomic symbol is Li. Lithium belongs in the most reactive group on the periodic table which is called alkali metal. Lithium under standard conditions is the lightest metal it is also one of the least dense solids. Lithium has an atomic mass of 6.94 and density of 0.534.…

    • 288 Words
    • 2 Pages
    Decent Essays
  • Decent Essays

    On the other hand, the reason I have avoided choosing stainless steel, iron, steel and wood over cast aluminum as the frame is that stainless steel is expensive and when creating stainless steel without the highest technology machine which is good. For this reason, the stainless steel is high cost, maintaining the machine will be costing money compared to cast aluminum which is casting. Also, stainless steel can be hard to handle meaning the material all be having a large amount of waste and re-work. Stainless is heard to welding because of its fast dissipation of heat which can create ruined pieces or even high scrap cost.…

    • 107 Words
    • 1 Pages
    Decent Essays
  • Decent Essays

    Due to project budget constrain, aluminium is chosen over stainless steel as it is cheaper. However aluminium is relatively weaker as compared to stainless steel. In order to compensate the weaker material strength, we chose to increase the thickness of the L-bracket and indexing plate. The thickness of the L-bracket and indexing plate are 10mm and 5mm…

    • 58 Words
    • 1 Pages
    Decent Essays
  • Great Essays

    Economies of scale Flow 1) Examples how economies of scale is helpful, 2) New technology and economies of scale. 3) Critic of economies of scale. 4) Economies of scope(From PDF) 5) Govt initiatives to achieve economies of scale. Economies of scale: The change in long run average cost as output increases is the basis of economies of scale.…

    • 2736 Words
    • 11 Pages
    Great Essays
  • Great Essays

    In this study, the main object is to find out the hardness change due the carbonized and non-carbonized alloys in air cool or water quench’s hardness differences. And the result showed that the carbonized with in air cool samples to compare with the normal air cool without covered carbon powder were similar, but the one covered with carbon were increased the overall hardness than the one without. On the carbonized with water quench it showed the one covered with carbon can provided more hardness (twice or more) than the center and also the one without covered carbon. Introduction: Diffusion on a manufacturing industry is a process of increasing the harness of the metal itself usually is for the alloy that contain carbon, which usually…

    • 1683 Words
    • 7 Pages
    Great Essays
  • Improved Essays

    All metal manufacturing includes a solidification process. The metal is either atomised to a powder, or it is cast. There is several casting methods used today. Many of the methods use the mould only once, for example sand mould casting, the lost-wax method and precision casting. For larger quantities of liquid metal, there are basically two methods: ingot casting and continuous casting.…

    • 387 Words
    • 2 Pages
    Improved Essays
  • Superior Essays

    Graphene Lab Report

    • 2628 Words
    • 11 Pages

    Introduction Graphene is considered as pure carbon in the form of a very thin, one atom thick nearly transparent sheet. It is very strong for its low weight (100 times more stronger than steel and it conducts heat and electricity efficiently. While scientists had theorized about graphene for decades, it was first produced in the lab in 2003. Because it is virtually two-dimensional, it interacts oddly with light and with other materials.…

    • 2628 Words
    • 11 Pages
    Superior Essays
  • Improved Essays

    4.TAGUCHI ANALYSIS FOR THE EXPERIMENTAL RESULTS To examine the 100Cr6 bearing steel through DCT, and to identify the optimum parameter condition of the DCT process, the prediction of the Taguchi analysis is used. The Taguchi analysis and ANOVA, gives the optimized parameter setting and the most influential factor of the DCT process respectively. The quality performance of the deep cryo-treated 100Cr6 steel samples based on the L9 OA was evaluated by conducting the reciprocatory wear tests.…

    • 1259 Words
    • 6 Pages
    Improved Essays