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MATERIAL SCIENCE

MATERIAL SCIENCE. 2013-2014. Offered to : 6 th Semester B.Tech students of CSE, IT and ECE Number of Credit : 4 (3 1 0) Evaluation Criteria : same as earlier semesters. The course in brief.

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MATERIAL SCIENCE

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  1. MATERIAL SCIENCE 2013-2014

  2. Offered to: 6th Semester B.Tech students of CSE, IT and ECE Number of Credit: 4 (3 1 0) Evaluation Criteria: same as earlier semesters The course in brief

  3. Engineer’s adapt materials and energy for society need. (Lawrece H Van Vlack in his famous book Elements of Material Science and Engineering) Materials and their properties are important for any discipline of Engineering. Particular disciplines have interest in particular properties and particular kind of materials. In this course we will bother about those properties which are used by ECE, CSE and IT engineers. What do engineers do?

  4. Dielectric materials 13 • Magnetic materials 13 • Polymers and Ceramics 04 • Superconducting Materials 04 • Optical Materials 04 • Thermoelectric materials 02 ***Notable exception, we will not teach Semiconductor materials****** What modules will be taught

  5. Further Insight

  6. P E ?????? ?????? Dielectric Materials Magnetic Materials

  7. Storage devices • Magnetic • Optical

  8. ??????

  9. Ceramic crockery; may be more

  10. Carbide cutters; GaN LEDs

  11. ????

  12. Bullet train , japan; speeds upto 400 kmph; based on magnetic levitation

  13. ?????

  14. ?????

  15. Laser needle therapy using optical materials

  16. ?????

  17. LCD mini panel

  18. Let us understand the importance of these module through some examples Examples: • Low dielectric in VLSI • Magnetic materials for data storage • Display devices in your mobile to your laptop • As you call your parents the message goes through optical materials. • Blue ray disk: Optical storage.

  19. Find Ten most advanced application of engineering science in your discipline which is already implemented and find out how material science played an important role in implementation of that. • Find out any two application of engineering science in your discipline which is already implemented and material science has not played an important role in implementation of that. • Ceramics are burnt clay: Now, find out what portion of your house and institute is made of ceramics. What about this class room? Any application in electronic devices? Exercises to convince you the importance

  20. That's easy. Look around. What do you see? Materials are everywhere! The clothes we wear are made from a variety of materials. Our home is made of materials - mostly manufactured. The glass in the windows, the ceramic dinnerware, the metal silverware, and everywhere we look we see products made from materials. • Most products are made from many different kinds of materials to satisfy the needs of the product. One way to look at materials is to consider the various generic descriptions such as metals, ceramics, plastics semiconductors, composites What are materials

  21. Metals: Large number of free electrons, good conductors of electricity and heat, not transparent to visible light. Quite strong, yet deformable, this accounts for their extensive use in structural applications. • Ceramics:Typically insulative to passage of electricity and heat and are more resistant to high temperatures and harsh environments than metals and polymers. Ceramics are hard but very brittle • Polymers:Very large molecular structure. These materials typically have low densities and may be extremely flexible. Polymer include your hair to familiar plastic and rubber materials • Composites:Consists of more than one material type. Fiberglass is a familiar example in which glass fibers are embedded within a polymeric material. A composite is designed to display a combination of the best characteristics of each component materials. Fiber glass acquires strength from the glass and flexibility from the polymer. Many of the recent material developments have involved composite materials. Classification of Materials

  22. Semiconductors: Electrical characteristics of these materials are extensively sensitive to the presence of minute concentrations of impurity atoms; these concentrations may be controlled over very small regions. The semiconductors have made possible the advent of integrated circuitry that has totally revolutionized the electronic industry. Organic material (Bio-material): These are polymeric materials composed of carbon compounds. All other 4 types of materials stated above may be organic material/ biomaterial. Therefore, this is not an uniquely defined class. Classification of Materials

  23. Smart (or intelligent) materials: These materials are able to sense changes in in their environments and respond to these changes in predetermined manners-traits that are found in living organisms. The component of smart material include some type of sensor that detects an input and actuator that performs a responsive and adaptive function. • Nano-Materials: Nanotechnology comprises any technological developments on the nanometre scale, usually 0.1-100nm. (One nanometer equals one thousandth of a micrometer or one millionth of a millimeter.) The term sometimes applies to any microscopic technology. Often the properties of materials changes at this length and when we develop new materials having the characteristic properties of nanometer scale then they are called nanomaterial. Nano-transistors are already in use. http://en.wikipedia.org/wiki/Nanomaterial More advanced materials

  24. It varies from requirement nut normally we look for: • Mechanical Properties: (like elasticity, plasticity, toughness, resilience, tensile strength, yield strength, impact strength, ductility, malleability, brittleness, hard ness, Fatigue, Creep etc.) • Thermal Properties: (like Heat capacity, Specific heat, Melting points, thermal expansion, thermal conductivity, thermal shock resistance) • Electrical Properties: (resistivity, conductivity, dielectric strenght, thermoelectricity etc. • Magnetic properties: (Permeablity, coerecive force, hysteresis, superconductivity) • Chemical properties: Chemical composition, corrosion resistance, acidity and alkalinity etc. • Optical properties: refractive index, absorptivity and absorption coefficient, reflectivity etc. • Physical properties: Dimension, appearance, density, color, porosity etc. Which properties of materials are of engineering interest?

  25. A Text book of solid state physics by S O Pillai • Material Science and engineering an Introduction by W D Callister Jr • Science of Engineering Materials by Srivastava and Srinivasan • Elements of Material Science and Enginnering by Lawrence H Van Vlack Books used for this course

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