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Author: haroonkhan

  • Functions of Paints

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    haroonkhan
    in

    Irrespective of the type of paint, in general, the functions of paints are as follows:

  • PAINTS

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    haroonkhan
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    Paint is mainly composed of two ingredients, viz., a base which is a solid material and a liquid called a vehicle. The vehicle carries the solid matter, distributes it evenly and enables the solid matter to adhere to the surface.

  • INTRODUCTION

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    haroonkhan
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    Apart from protecting various building units from the weathering action of the atmosphere, the main objective of surface finishing materials is to provide a decorative finish to obtain a clean, colourful and pleasing surface. Surface finishing materials are paints, varnishes, distempers and white/colour washing. The surfaces may be plastered wall surfaces, ceilings, wooden surfaces, metallic…

  • Nickel Alloys

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    haroonkhan
    in

    Important nickel alloys are iconel and monel metals. The composition of iconel is 75% nickel, 15% chromium and 9% iron. Monel metal comprises two-thirds nickel, one-thirds copper with a small percentage of elements like iron, silicon, manganese and carbon. Iconel can be cast, forged, rolled and cold drawn. It has brittle behaviour when the temperature…

  • Magnesium Alloys

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    haroonkhan
    in

    Magnesium alloys comprise 3–10% aluminium, 1–3.8% zinc and 0.4% manganese. The two important magnesium alloys are dow metal and electron metal. Dow metal comprises 9.1% magnesium and 9% aluminium. Electron metal, a trade name of magnesium, is a base alloy that contains 4% zinc and small percentages of copper, iron and silicon. The tensile strength…

  • Aluminium Alloys

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    haroonkhan
    in

    Principal elements that are alloyed with pure aluminium to improve its tensile strength and hardness are copper, silicon, manganese, zinc, magnesium and nickel. Copper is the main hardening element for aluminium alloy by the addition of a small percentage of magnesium, which improves the hardness and strength after heat treatment. Similarly, the addition of a…

  • Copper Alloys

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    haroonkhan
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    Two important principal classes of copper alloys are brass and bronze. Brass is primarily an alloy of copper and zinc, whereas bronze is a combination of copper and tin. Brasses are formed with 5–45% of zinc and copper. Brasses possess excellent mechanical properties. They are corrosion resistant and are readily machinable. The mechanical properties of…

  • NON-FERROUS ALLOYS

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    haroonkhan
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    Non-ferrous alloys may be defined as a coherent non-ferrous metallic mass produced by combining two or more non-ferrous metals. Some important non-ferrous alloys are discussed below.

  • Nickel

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    haroonkhan
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    Nickel is found combined with iron sulphides in deposits. The properties of nickel are as follows:

  • Magnesium

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    by

    haroonkhan
    in

    It occurs in nature in several minerals such as magnesite (MgCO3), dolomite (CaCO3, MgCO3), kieserite (MgSO4 · H2O) and carnalite (MgCl2 · KCl · 6H2O). The metal is prepared by the chloride or oxide process. The oxide process is not in use anymore. In the chloride process, a melted mixture of chlorides of sodium, potassium and magnesium…