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

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Presentation transcript:

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

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

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

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

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

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

A METAL Is a material extracted from a mineral ore. Aluminum Chromium Copper Iron Magnesium Nickel Tin Zinc

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

Ferrous vs. Nonferrous Cast Iron Steel Aluminium Alloys Brass Bronze

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

WOOD vs. MODIFIED WOOD: WOODMODIFIED WOOD

Properties Species of trees Speed of growth Water content Hardness, elasticity and resilience Low thermal Low electrical Easy to shape & assemble Colors and shapes Lightness

1.SPECIES OF TREES HARDWOODSOFT WOOD

2.SPEED OF GROWTH HEARTWOOD SAPWOOD

3.WATER CONTENT

4.HARDNESS, ELASTICITY, RESILIENCE & TOUGHNESS

5.LOW THERMAL & ELECTRICAL CONDUCTIVITY

6.EASY TO SHAPE & ASSEMBLE

7.COLOURS & SHADES

8.LIGHTNESS

Degradation Fungi Insect Microorganism

Pine Beetle

PROTECTION PRESSURE TREATINGROASTING Chromated Copper Arsenate (CCA) Maple

CERAMICS

Properties Low electrical conductivity High degree of hardness Low thermal conductivity Resistant to corrosion Mechanical parts

1.LOW ELECTRICAL CONDUCTIVITY

2.HIGH DEGREE OF HARDNESS

3.LOW THERMAL CONDUCTIVITY

4.RESISTANT TO CORROSION

5.MECHANICAL PARTS

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

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

METALS & ALLOYS:

Properties Good thermal and electrical conductivity Ductile Malleable

1.Good thermal and electrical conductivity

2.Ductile

3.Malleable

METALS & ALLOYS: Degradation

OXIDATION = Corrosion

METALS & ALLOYS:

Protection Metallic Coating Steel Heat Treatments

METALLIC COATINGS Enamel Galvanized Chrome

STEEL HEAT TREATMENTS: Quench Hardening

APPENDIX 5 (p. 531)

PLASTIC & COMPOSITES Workbook p. 205 Textbook p. 397

A PLASTIC Is a material made of polymers, to which other substances may be added to obtain certain desirable properties (p. 397)

Polymer Structure

A THERMOPLASTIC Is a plastic that becomes soft enough when heated to be molded or remolded and that hardens enough when cooled to hold its shape

Thermoplastic Products

A THERMOSETTING PLASTIC Is a plastic that remains permanently hard, even when heated

Thermosetting Products

A COMPOSITE Is formed by combining materials from different categories to obtain a material with enhanced properties.

Carbon Fiber

APPENDIX 5 - (p. 530)

Wood, modified wood, ceramics, metals and alloys lab 1.Work with table groups 2.Write ALL names on hand-out 3.Hand in at the end of lab

Homework Workbook - p