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Composite Materials

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ENMAT101A Engineering Materials and Processes Associate Degree of Applied Engineering (Renewable Energy Technologies) Lecture 23 – Composite Materials. Composite Materials. EMMAT101A Engineering Materials and Processes. Composite Materials (Higgins 23).

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  1. ENMAT101A Engineering Materials and ProcessesAssociate Degree of Applied Engineering (Renewable Energy Technologies)Lecture 23 – Composite Materials

  2. Composite Materials EMMAT101A Engineering Materials and Processes

  3. Composite Materials (Higgins23) ‘Composites‘ are mixtures of two separate components, one being the matrix (glue), the other giving strength/hardness/stiffness usually as particles or fibres. This chapter is particle composites, next chapter fibre composites Moldavite, a natural glass formed by meteorite impact, from Besednice, Bohemia A modern greenhouse in Wisley Garden, England, made from float glass Roman Cage Cup from the 4th century CE EMMAT101A Engineering Materials and Processes

  4. 23.1 Introduction (Higgins23.1) 23.1.1 Particle composites Particle-hardened composites Dispersion-hardened composites 'Filler' composites To make sure the particle stick (cohesion); Mechanical bonding (rough surface) Physical bonding (Van der Waals) Chemical bonding Solid-solution bonding Higgins EMMAT101A Engineering Materials and Processes

  5. 23.2 Particle-hardened composites (Higgins23.2) These are generally the products of powder metallurgy in which extremely hard particles of a ceramic material are held in a tough ductile matrix of some metal. Such materials are called cermets and are used for cutting tools and die materials. Higgins EMMAT101A Engineering Materials and Processes

  6. 23.2 Particle-hardened composites EMMAT101A Engineering Materials and Processes

  7. 23.2 Particle-hardened composites (Higgins23.2) Higgins EMMAT101A Engineering Materials and Processes

  8. 23.3 Dispersion-hardened materials (Higgins23.3) Small particles impede slip in the matrix. 23.3.1 Sintered aluminium powder (SAP) Higgins EMMAT101A Engineering Materials and Processes

  9. 23.3 Dispersion-hardened materials (Higgins23.3) 23.3.2 Manufacturing processes 23.3.3 Modern superalloys Higgins EMMAT101A Engineering Materials and Processes

  10. 23.4 Mortar and concrete (Higgins23.4) 23.4.1 Mortar 23.4.2 Concrete Higgins EMMAT101A Engineering Materials and Processes

  11. 23.5 Tarmacadam(Higgins23.5) Higgins EMMAT101A Engineering Materials and Processes

  12. Resources. Wikipedia: Concrete EMMAT101A Engineering Materials and Processes

  13. Glossary Cohesion Mechanical bonding Physical bonding Chemical bonding Solid-solution bonding Cermets Sintering Matrix Mechanical alloying Aggregate Rich and lean Cement/aggregate ratio Portland cement Dispersion hardened material EMMAT101A Engineering Materials and Processes

  14. QUESTIONS Higgins Ch23, Newell, Timmings, Sheedy, Callister, Ashby • Define all glossary terms • Explain the issues of making strong concrete regarding water ratio, cement ratio, aggregate and sand, curing time and temperature, curing humidity. Explain what would be done to achieve high strength and low shrinkage. • What is a cermet and what are they used for? Give some examples of cermets and explain what properties they have that make them suitable for their purpose. • Give five reasons for a particle to be added to a matrix – include a range of different types of particle composites. • Explain how small particles can strengthen a ductile metal matrix even when the particles are rounded. (Dispersion hardened material). EMMAT101A Engineering Materials and Processes