Pure metal and alloy

37,465 views

Published on

Published in: Education, Business, Technology
3 Comments
10 Likes
Statistics
Notes
No Downloads
Views
Total views
37,465
On SlideShare
0
From Embeds
0
Number of Embeds
136
Actions
Shares
0
Downloads
495
Comments
3
Likes
10
Embeds 0
No embeds

No notes for slide

Pure metal and alloy

  1. 1. Alloys
  2. 2. The Differences Between Pure Metals & Alloys
  3. 3. Pure Metals Pure Metals have the following physical properties … High Density. High Melting & Boiling Points. Good Conductors Of Heat & Electricity. Malleable. Ductile. Lustrous.
  4. 4. Pure Metals <ul><li>High Density </li></ul><ul><li>Pure metals is made up of one type of atoms, thus all atoms are of the same size. </li></ul><ul><li>The atoms in a pure metals are orderly arranged & closely packed together. </li></ul>Orderly arranged & closely packed together
  5. 5. Pure Metals <ul><li>High Melting & Boiling Points </li></ul><ul><li>The forces of attraction between the very closely-packed atoms are very strong, thus a large amount of energy is required to overcome these forces. </li></ul>
  6. 6. Pure Metals <ul><li>Ductile </li></ul><ul><li>Although the forces of attraction of the atoms are very strong, they are not rigid. </li></ul><ul><li>So, when a force is applied, the layers of atoms can slide over one another. </li></ul><ul><li>This is why metals are ductile @ can be stretched. </li></ul>
  7. 7. FORCE FORCE
  8. 8. Pure Metals <ul><li>Malleable </li></ul><ul><li>The arrangement of atoms in pure metals are not perfect because there are some empty spaces in between the atoms. </li></ul><ul><li>So, when a metal is knocked @ pressed, groups of atoms may slide & then settle into new positions. </li></ul>
  9. 9. FORCE
  10. 10. The weakness of pure metals are ... WEAK & SOFT due to their DUCTILITY & MALLEABILITY.
  11. 11. Alloys <ul><li>Alloy is a mixtures of two or more elements with a certain fixed composition in which the major component is a metal. </li></ul><ul><li>Characteristics of alloy are, : </li></ul><ul><li>Stronger </li></ul><ul><li>Harder </li></ul><ul><li>Resistant to corrosion </li></ul><ul><li>Have a better finish </li></ul><ul><li>& </li></ul><ul><li>Lustrous </li></ul>
  12. 12. Alloys Why Make Alloys ? To increase the strength and hardness of a pure metal. To increase the resistance to corrosion of a pure metal. To improve the appearance of a pure metal.
  13. 13. Composition, Properties, & Uses of alloys
  14. 14. BRONZE Composition 90% of copper & 10% of tin. Properties Hard, strong, does not corrode easily & shiny surface.
  15. 15. BRASS COMPOSITION 70% of copper & 30% of zinc. PROPERTIES Harder than copper.
  16. 16. Cupro-nickel COMPOSITION 75% of copper & 25% of nickel. PROPERTIES Beautiful surface, shiny, hard & does not corrode easily.
  17. 17. STEEL COMPOSITION 99% of iron & 1% of carbon. PROPERTIES Hard & Strong.
  18. 18. STAINLESS STEEL <ul><li>COMPOSITION </li></ul><ul><li>74% Iron, 8% Carbon & 18% chromium. </li></ul><ul><li>PROPERTIES </li></ul><ul><li>Shiny, strong & does not rust. </li></ul>
  19. 19. DURALUMIN <ul><li>COMPOSITION </li></ul><ul><li>93% of aluminium, 3% of copper, 3% of magnesium & 1% manganese. </li></ul><ul><li>PROPERTIES </li></ul><ul><li>Light & strong. </li></ul>
  20. 20. PEWTER <ul><li>COMPOSITION </li></ul><ul><li>96% of tin, 3% of copper & 1% of antimony. </li></ul><ul><li>PROPERTIES </li></ul><ul><li>Shiny, strong, & does not corrode. </li></ul>
  21. 21. 9-CARAT GOLD <ul><li>COMPOSITION </li></ul><ul><li>37.5% of gold, 11% of silver & 51.5% copper. </li></ul><ul><li>PROPERTIES </li></ul><ul><li>Shiny, strong, & does not corrode. </li></ul>
  22. 22. .. THE END ..

×