Question

Oxidation resistance should be the prime requirement for the high temperature structural applications.

(a) True

(b) False

I had been asked this question in a job interview.

Asked question is from Directional Solidification topic in section Pattern and Mould, Principles of Gating & Risering of Casting-Forming-Welding I

Answer 1

Correct option is (a) True

To elaborate: A primary requirement for high temperature structural applications is an adequate oxidation resistance at temperature more than 1000 ⁰C. So, attention must be focused on those alloys which have a high concentration of aluminium and silicon, however, these elements produce protective oxide scales of alumina and silica respectively to protect the material.