The ins and outs of Refractory metal

1. The ins and outs of Refractory metal Presented by: Kyle Levesque Date: 2/28/2006

2. What are refractory metals? • Refractory metals are metals that have high resistance to … • Heat changes • Wear • Corrosion (at certain temperatures) • Some places you may have already used a refractory metals... • Light bulbs • Drill bits • TIG Welders • Electrolytic Capacitors • Medical equipment

3. Some Metals in this category Pictures from: • These metals are not fabricated by casting must be made through powder metallurgy • In a pure form they are brittle • Can be difficult to machine

4. Formally know as Wolfram • Very hard metal that is steel gray to white in color. • Highest melting point 6192 °F • Highest tensile strength at high temperatures (3000 °F and up)

5. Can be used in small quantities to harden steels and others metals (primary use of this transition metal) • Very hard metal that is grey metallic in color. • High cost $40 a pound in 2000 • High melting point • Molybdenum has many medical uses as well.

6. Rare soft transition metal • Gray bluish in color when exposed to air • Pure metal form making it physically inert • Many uses (alloys, reactors, jewelry)

7. Very rare element that is heavy and very corrosive resistant • It has a Blue-gray luster • Great conductor of heat and electricity • Used manly in capacitors and super-alloys

8. More common metal out of the refractory metals • Silvery White in color • High strength low density 43% lighter than steel • Good corrosive resistance, light weight, high melting point, and availability makes this metal widely used from armor to paint coatings

9. Some issues with Refractory metals • Refractory metals at high temperatures oxidization extremely easily. ( imagine TIG welding with out the gas on) • Poor ability to machine at low temperatures • High Cost • Powders are toxic and can effect things biologically or can be high irritants

10. For more information…. References: • Wikipedia, the free encyclopedia. Great source for metal uses and properties. Specifics on refractory metals can be found at: http://en.wikipedia.org/wiki/Refractory_metal • http://www.rembar.com/tech2.htmmachining and thermal properties of Refractory metals. • http://www.candldevelopment.com/refractory_elements.htm Basic element uses and properties.

11. Are there any questions?