1. Ch. 12 1.3-4 students per table 2.Workbook & Textbook 3.Pencil / Pen 4.Start when quiet

2. Homework Check Pp. 199-200

3. Ch. 12: Categories of Materials 1.Wood & Modified Wood 2.Ceramics 3.Metals & Alloys 4.Plastics 5.Composites

4. Text / Work Books Text Book – p. 391 Work Book - p. 201 Copy the following definitions

5. WOOD Is a material obtained by harvesting and processing trees (p. 390)

6. MODIFIED WOOD Is treated wood or a material made from wood mixed with other substances

7. A CERAMIC Is a solid material obtained by heating inorganic matter containing various compounds, usually oxides.

8. A METAL Is a material extracted from a mineral ore.

9. AN ALLOY Is a mixture of a metal with one or more other substances.

10. STEEL HEAT TREATMENTS Are methods of enhancing certain mechanical properties of steel through periods of heating.

11. WOOD vs. MODIFIED WOOD: WOODMODIFIED WOOD

12. Properties

13. 1.SPECIES OF TREES HARDWOODSOFT WOOD

14. 2.SPEED OF GROWTH HEARTWOOD SAPWOOD

15. 3.WATER CONTENT

16. 4.HARDNESS, ELASTICITY, RESILIENCE & TOUGHNESS

17. 5.LOW THERMAL & ELECTRICAL CONDUCTIVITY

18. 6.EASY TO SHAPE & ASSEMBLE

19. 7.COLOURS & SHADES

20. 8.LIGHTNESS

21. Degradation Fungi Insects Microorganism

22. Pine Beetle

23. PROTECTION PRESSURE TREATINGROASTING Chromated Copper Arsenate (CCA) Maple

24. CERAMICS

25. Properties

26. 1.LOW ELECTRICAL CONDUCTIVITY

27. 2.HIGH DEGREE OF HARDNESS

28. 3.LOW THERMAL CONDUCTIVITY

29. 4.RESISTANT TO CORROSION

30. 5.MECHANICAL PARTS

31. CERAMICS: Degradation ACIDS – sulphuric acid BASE – calcium hydroxide THERMAL SHOCK

32. CERAMICS: Protection AVOID… ACIDS – sulphuric acid BASE – calcium hydroxide THERMAL SHOCK

33. METALS & ALLOYS:

34. Properties

35. 1.Good thermal and electrical conductivity

36. 2.Ductile

37. 3.Malleable

38. Degradation

39. OXIDATION = Corrosion

40. Protection

41. METALLIC COATINGS Enamel Galvanized Chrome

42. STEEL HEAT TREATMENTS: Quench Hardening

43. Homework Pp. 201-204