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Composite Materials A novel interesting field Rui Zhang zhangray@zzu

Composite Materials A novel interesting field Rui Zhang zhangray@zzu.edu.cn. What do we want?. The most advanced information The most useful technique The most practical training. Outline What are Composite Materials? New Uses for Composites How to make Composites?

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Composite Materials A novel interesting field Rui Zhang zhangray@zzu

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  1. Composite Materials A novel interesting field Rui Zhang zhangray@zzu.edu.cn

  2. What do we want? • The most advanced information • The most useful technique • The most practical training

  3. Outline • What are Composite Materials? • New Uses for Composites • How to make Composites? • What can we learn from the study on Composites? • What left for us to do in the coming study ? • What can we be in our future?

  4. What are Composite Materials Composites: Artand Science making and using materials those did not appear until several years ago, and those do not exit now and will be discovered in the future composed of at least 2 different kinds of materials 1. Ceramics + Ceramics: Al2O3 + Y2O3 (YAG): transparent, new laser generator 2. Ceramics + Organics: SiC + resin 3.Ceramics + Metals (Cermet): Diamond + Co

  5. StructuralUses:stronger, more flexible, more reliable 1. In rocketry and missile: New Uses of Composites nose cone to withstand extreme temperatures 2. In jet aircraft: protective composite coating 3. Machining tools: high speed cutting, polishing 4. Reinforcement clusters: (Cu +SiC)/ Fe, Al etc.

  6. Functional uses:energetic, sensitive, smart etc. T1  T2 1 .Energetic cells: thermoelectric materials (for military uses and for wild researches) Porous composites Carbon Nano Tube (CNT) + SiO2 TiO2 + SiO2 CNT + Nano Ag 2. Luminescent materials: Al2O3-Eu2O3-SrCO3 3. Environmental materials:

  7. Exhausted gas PO2 (1) PO2 (2)  4. Sensors: more sensitive, accuracy ZrO2-Y2O3 clean the air other sensors of humidity, light, distance, toxic gases

  8. 5. Electronics: substrates: AlN + Al; Al2O3 + Al; SiC + Cu; etc high thermal-releasing property 6. Smart items PTC Piezoelectrics: nano robot capacitors: BaTiO3 + BN; PbTiO3 + PbMg1/3Nb2/3O3; SiTiO3 + PbTiO3; etc high dielectric property with low losses SiC + Al2O3 + MgO + SiO2

  9. How to make Composites? 1. Powder preparation: even co-dispersion Mechanical method, Chemical method 2. Forming: pressing, extrusion, casting 3. Firing: the key process Conventional sintering, Hot-pressing, Vacuum sintering

  10. What can we learn from the study on Composites? Advanced Theories : • Chemistry and physics at high temperature • Mechanical theories • Microstructure theory • Quantum theory (nanometer materials, superconductor) • Electric, luminescent, magnetic, and thermal theories • Other interdisciplinary theories

  11. advanced techniques : • The most advanced processing apparatus Microwave sintering: 915 MHz or 2450 MHz volumetric heating, energy-saving, clean, rapid (0.5 h) Spark plasma sintering (SPS): high pulsed current, rather rapid (10 min)

  12. Advanced analysis technology X-ray diffraction (XRD): to identify the phases. Scanning electron microscope (SEM): to to observe the morphologies Transmission electron microscope (TEM) to to examine the bonding structures of different phases High resolution TEM (HRTEM) to to observe the atomic arrangement at the boundary

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  16. Cu Cu Cu2O Cu Cu 40 nm

  17. Auger microscope (AES): to detect the surface elements. Energy dispersion spectra (EDS) to determine the elements

  18. Thermal analysis Differential scanning calorimetry (DSC), Thermogravimetry (TG), Mass spectroscopy (MS) to measure the thermodynamic behaviour useful for determination of heat treatment profile temperature, heating rate, protective atmosphere etc.

  19. O2 CO2

  20. What left for us to do in the coming study ? Confidence! Diligence ! Devotion ! Success and development!

  21. What can we be in our future? Scientists of Materials Science. Engineers of Materials Engineering. Researchers of Advanced materials Bosses of Materials Enterprise. Professors of Materials Science and Engineering Senior Employee(Superintendent) in foreign corporation

  22. Nobel Prize Winner: Prof. Kroto insists: Doubtand Question are the two prerequisites to do scientific researches

  23. Thank you for your attention and Any questions?

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