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How much of a stabilizing oxide is present in partially stabilized zirconium?

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How much of a stabilizing oxide is present in partially stabilized zirconium?

(a) 5%

(b) 10%

(c) 18%

(d) 24%

I have been asked this question in an interview for internship.

The doubt is from Ceramics in chapter Non Metallic Materials of Engineering Material & Metallurgy

1 Answer

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Right choice is (a) 5%

Explanation: Zirconia is added with stabilizing oxides to avoid cracking. These stabilizing oxides may be MgO, CaO, or Y2O3. Partially stabilized zirconium contains about 5% stabilizing oxide, while fully stabilized oxides contain about 18% of the same.

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