what is thermite reaction? How it is used in joining railway tracks and cracked parts of machines.How do we get stainless steel?

Asked by  | 6th Jun, 2013, 01:22: PM

Expert Answer:

A thermite reaction is basically iron oxide (rust) reacting with aluminum to produce molten iron.  

When the mixture is heated, it starts reacting: the aluminum is more reactive than the iron, so it "pinches" the oxygen from the iron to make aluminum oxide and iron.

The typical chemical reaction is: 

Fe2O3 + 2Al ? 2Fe + Al2O3 + heat and light

Stainless steels are iron alloys with a minimum of 10.5% chromium. Other alloying elements are added to enhance their structure and properties such as formability, strength and cryogenic toughness. These include metals such as:

  • Nickel
  • Molybdenum
  • Titanium
  • Copper

Non-metal additions are also made, the main ones being:

  • Carbon
  • Nitrogen

Answered by  | 7th Jun, 2013, 11:48: AM

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