activity 6.1a – material properties display metal - gold mr. heck
TRANSCRIPT
Section 1 - Categories of Materials
1. Organics
2. Metals and Alloys
3. Polymers
4. Ceramics
5. Composites
Category - Organic
• Organic means coming from a living source
• Examples include:
LEATHER(Car Upholstery)
BONE (Knife Handle)
ELMER’S GLUE (Milk Protein Glue)
Category – Metal/Alloy• Description:
Metal \Met"al\ (? or ?; 277), noun [F. m['e]tal, L. metallum metal, mine, Gr. ? mine; cf. Gr. ? to search after. Cf. {Mettle}, {Medal}.]
1. (Chem.) An elementary substance, as sodium, calcium, or copper, whose oxide or hydroxide has basic rather than acid properties, as contrasted with the nonmetals, or metalloids. No sharp line can be drawn between the metals and nonmetals, and certain elements partake of both acid and basic qualities, as chromium, manganese, bismuth, etc.
BRONZE ALLOY(Copper and Tin)STEEL ALLOY
(Iron and Carbon)COPPER
Part 2 – Properties of a single material - Gold
• What makes gold unique?– It rare, and valuable– Gold resists corrosion– It is a good conductor of electricity
Gold computerparts
GoldJewelry
Gold DentalWork
Material Life Cycle - Gold
Gold Ore Mined
Ore is smelted into Gold ingots
Gold ingots areformed into “blanks”(wire, chain, sheets)
Consumer products are made from gold blanks
Product made from Gold are services(Jeweler, Dentist…)
“Useless” Gold itemsmelted down
For scrap