Question
What are interstitial compounds? Give the classification of alloys with examples
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Answer
1. An interstitial compound or alloy is a compound that is formed when small atoms like hydrogen, boron, carbon or nitrogen are trapped in the interstitial holes in a metal lattice.
2. They are usually non-stoichiometric compounds.
3. Transition metals form a number of interstitial compounds such as TiC, ZrH1.92, Mn4N, etc.
4. The elements that occupy the metal lattice provide them new properties.
2. They are usually non-stoichiometric compounds.
3. Transition metals form a number of interstitial compounds such as TiC, ZrH1.92, Mn4N, etc.
4. The elements that occupy the metal lattice provide them new properties.
- They are hard and show electrical and thermal conductivity.
- They have high melting points higher than those of pure metals.
- Transition metal hydrides are used as powerful reducing agents.
- Metallic carbides are chemically inert.
- Ferrous alloys: Ferrous alloys have atoms of other elements distributed randomly in atoms of iron in the mixture. As the percentage of iron is more, they are termed ferrous alloys eg. nickel steel, chromium steel, stainless steel, etc.
- Non-ferrous alloys: Non-ferrous alloys are formed by mixing atoms of transition metal other than iron with a non-transition element. eg. brass, which is an alloy of copper and zinc.
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