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Copper and its alloys

ENMAT101A Engineering Materials and Processes Associate Degree of Applied Engineering (Renewable Energy Technologies) Lecture 16 – Copper and its alloys. Copper and its alloys. EMMAT101A Engineering Materials and Processes. Copper and its alloys.

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Copper and its alloys

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  1. ENMAT101A Engineering Materials and ProcessesAssociate Degree of Applied Engineering (Renewable Energy Technologies)Lecture 16 – Copper and its alloys

  2. Copper and its alloys EMMAT101A Engineering Materials and Processes

  3. Copper and its alloys Note: This lecture closely follows text (Higgins Ch16) EMMAT101A Engineering Materials and Processes

  4. Copper (Higgins 16.1) READ HIGGINS 16.1 Some history… And for a bit more up-to-date action… Bronze-age weaponry http://en.wikipedia.org/wiki/File:Bronze_age_weapons_Romania.jpg EMMAT101A Engineering Materials and Processes

  5. Uses of copper http://www.inmetmining.com EMMAT101A Engineering Materials and Processes

  6. Worldwide Copper Production Worldwide Copper Production may be nearing its peak. Copper is closely linked to demands of industrial expansion– needed for both infrastructure and electrical products. EMMAT101A Engineering Materials and Processes

  7. Copper Price The price of copper is sensitive to production demands (set by manufacturing outlook: i.e. companies placing orders based on their projected production) It is also magnified by tightening supply as China and India increase demand. So copper price rises on optimism. Note the GFC drop. http://www.kitcometals.com EMMAT101A Engineering Materials and Processes

  8. The extraction copper (Higgins 16.2) READ HIGGINS 16.2 The extraction of copper The 2010 Copiapó mining accident in Chile’s San José copper–gold mine. The 33 miners were trapped 700m underground, surviving for a record 69 days before their rescue through drilled holes. Extraction of copper Wikipedia EMMAT101A Engineering Materials and Processes

  9. Properties of copper(Higgins 16.3) READ HIGGINS 16.3 Conductivity (electrical and thermal) Corrosion resistance Ductility http://www.reuters.com http://www.sciencelearn.org.nz EMMAT101A Engineering Materials and Processes

  10. Coppers and alloys(Higgins 16.4) READ HIGGINS 16.4 Oxygen-free high-conductivity (OFHC) copper: Electrolytically refined: Electrical uses 'Tough-pitch' copper: Heat refined. Lower conductivity. Deoxidised copper: Tough pitch copper deoxidised with phosphorus which improves weldability, but worse electrically. The Xstrata copper electrorefiningtankhouse at Copper Refineries in Townsville, Queensland, Australia. EMMAT101A Engineering Materials and Processes

  11. Coppers and alloys(Higgins 16.4) READ HIGGINS 16.4.1: Alloys of copper 1. Brasses: copper-zinc alloys 2. Bronzes: copper-tin alloys Phosphor bronzes: copper-tin-phosphorus alloys Gunmetals: copper-tin-zinc alloys 3. Aluminium bronzes: copper-aluminium alloys 4. Cupro-nickels: copper-nickel alloys Nickel silvers: copper-zinc-nickel alloys 5. Beryllium bronzes: copper-beryllium alloys EMMAT101A Engineering Materials and Processes

  12. The brasses(Higgins 16.5) Brass READ HIGGINS 16.5: CAREFULLY! Brass: Up to 45% Zn, also some Sn, Pb, Al, Mn, Fe Figure 16.1 The section of the copper-zinc equilibrium diagram which covers brasses of engineering importance. (Higgins) EMMAT101A Engineering Materials and Processes

  13. The brasses (Higgins 16.5) Complete copper-zinc equilibrium diagram: Phases: a up to 37% Zn: Ductile: e.g. 70/30 Cold working b above to 37% Zn Hot working Tin: corrosion Lead: machinablilty http://pwatlas.mt.umist.ac.uk EMMAT101A Engineering Materials and Processes

  14. The brasses(Higgins 16.5) READ HIGGINS 16.5: CAREFULLY! 70/30 Brass: That’s copper/zinc ratio (i) 70-30 brass as cast with cored crystals of a solid solution (ii) 70-30 brass, cold worked and then annealed at 600°C. The coring of the original cast structure has been removed by this treatment and recrystallisation has produced small crystals (twinned) of the solid solution a (Higgins Fig 16.2) EMMAT101A Engineering Materials and Processes

  15. The brasses(Higgins 16.5) READ HIGGINS 16.5: CAREFULLY! Brass: Up to 45% Zn, also some Sn, Pb, Al, Mn, Fe (iii) 60-40 brass as cast. This shows a typical Widmanstdtten structure and, on cooling, small a crystals (light) have precipitated from the bphase (dark). (Higgins Fig 16.2) EMMAT101A Engineering Materials and Processes

  16. Higgins EMMAT101A Engineering Materials and Processes

  17. Higgins EMMAT101A Engineering Materials and Processes

  18. The brasses(Higgins 16.5) READ HIGGINS 16.5.1 'Shape memory' alloys 'Shape memory' alloys have two distinct crystal structures that revert at a critical transformation temperature. Below the CTT structure is like martensite, and reverts back when heated above CTT. The shape change can be used to operate temperature-sensitive devices: automatic greenhouse ventilators, thermostatic radiator valves, de-icing switches, electric kettle switches and valves in solar heating systems. Note: The most widely used shape memory alloy is the equi-atomic Nickel Titanium alloy known commercially as Nitinol. http://www.doitpoms.ac.uk/tlplib/superelasticity/uses.php EMMAT101A Engineering Materials and Processes

  19. Tin bronzes(Higgins 16.6) READ HIGGINS 16.6 Tin bronzes, contain up to 18% Sn (Tin) with smaller amounts of P, Zn, Pb 1. Wrought tin bronzes up to 7% tin. Sheet, wire, drawn rod. 2 Cast tin bronzes with 10 to 18 % tin, used mainly for bearings. EMMAT101A Engineering Materials and Processes

  20. Bronzes(Higgins 16.6) EMMAT101A Engineering Materials and Processes

  21. Bronzes(Higgins 16.6) EMMAT101A Engineering Materials and Processes

  22. Aluminium bronzes(Higgins 16.7) READ HIGGINS 16.7 Two groups: cold-working alloys, and the hot-working alloys. 1. Wrought tin bronzes up to 7% tin. Sheet, wire, drawn rod. 2 Cast tin bronzes with 10 to 18 % tin, used mainly for bearings. 33 tonne propellor made from nickel aluminum bronze. qe-carrier.blogspot.com EMMAT101A Engineering Materials and Processes

  23. Aluminium bronzes(Higgins 16.7) EMMAT101A Engineering Materials and Processes

  24. Copper-nickel alloys (Higgins 16.8) READ HIGGINS 16.8 Cu and Ni complete solubility. Corrosion resistant. 16.8.1 Nickel-silvers EMMAT101A Engineering Materials and Processes

  25. EMMAT101A Engineering Materials and Processes

  26. Other copper alloys (Higgins 16.9) READ HIGGINS 16.9 16.9.1 Beryllium bronze Non-sparking tools 16.9.2 Copper-chromium Conductive & strong. 16.9.3 Copper-cadmium Drawn electrical wire 16.9.4 Copper-tellurium Machined electrical 16.9.5 Arsenical copper Thermal EMMAT101A Engineering Materials and Processes

  27. Online Resources. Cast Iron http://www.msm.cam.ac.uk/phase-trans/2001/adi/cast.iron.html Extraction of copper EMMAT101A Engineering Materials and Processes

  28. GLOSSARY • Brass • Bronze • Electrolysis • Phosphor bronzes • Gunmetals • Aluminium bronzes • Cupro-nickels • Nickel silvers • Beryllium bronzes EMMAT101A Engineering Materials and Processes

  29. QUESTIONS Moodle XML: Some questions in 10105 Steel • Define all the glossary terms. • Describe the name, uses and properties of 70/30 brass. • What constituents determine the names brass and bronze? • Describe how electrical grade copper is made. • Explain why applications that used copper alloys (e.g. cartridge brass) are being replaced with aluminium and mild steel. • Using current prices from LME (London Metals Exchange), determine the cost of ingredients for 1 tonne of High-tin bronze – Higgins Table 16.2. • Describe the following copper-based alloys and their uses. Monel, gunmetal, gilding metal, cartridge brass, free-cutting brass • What ingredient is added to brasses and bronzes to improve machability. Describe how this works in reference to microstructure. • Silver is the most conductive metal. By comparison, copper is 97%, gold 71% and aluminium 58%. Using current prices of each metal, rank conductivity per dollar. • Research the advantages and disadvantages of using aluminium vs copper for use as electrical conductors. Why is strength and conductivity difficult? EMMAT101A Engineering Materials and Processes

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