CBSE Class 10 Answered
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 | 06 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 | 07 Jun, 2013, 11:48: AM
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