I. The bond-energy curves for two engineering materials are shown on the curve t

Question

I. The bond-energy curves for two engineering materials are shown on the curve to the right. Your task is to select the better material for use in each application described below. Explain your reasoning for choosing material A or IR for each application, based on their bond-energy curves. (a) A device designed to sense temperature changes via changes in its dimensions. A substrate that is designed to be more thermally stable for electronic devices. (c) A nose for a hypersonic airplane that would provide structural integrity and provide some thermal protection. Examples of hypersonic vehicles include the Space Shuttle Orbiter and scramjets.

Explanation / Answer

(a) A device used to sense temperature change via changing its dimensions should use A because it has lower bond energy and it varies at different dimensions.

(b) B should be used because it requires more energy to break the bond so it would be more stable thermally

(c) B should be used because it would provide more thermal stability and the bond won't break in case of high pressure or high temperature.

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