Question

Which from the following alloys is used in gas turbine engines?

• A. Titanium alloy
• B. Cupra-nickel
• C. Stainless steel
• D. Nichrome

Hint:

Whenever a question asks for a common alloy optimized explicitly for severe high-temperature oxidation resistance, think of Nickel-Chromium based systems (Nichrome) or superalloys.

Answer 1

The Correct Option is D

Step 1: Understanding the Question:
The question asks us to identify the specific alloy from the options that is used in the manufacturing or operation of high-temperature environments like gas turbine engines.

Step 2: Key Formula or Approach:
Gas turbine engines operate under extreme conditions featuring incredibly high temperatures (often exceeding $1000^\circ\text{C}$) and highly oxidizing atmospheres. Materials used in these zones require exceptional resistance to thermal oxidation, creep, and scaling.

Step 3: Detailed Explanation:
Let's evaluate the properties of each option:

• Titanium alloys: Celebrated for their high strength-to-weight ratio and outstanding corrosion resistance, but they suffer structural degradation and oxidation when subjected to the sustained extreme thermal thresholds of turbine combustion zones.

• Cupra-nickel: Excellent marine-grade corrosion resistance but lacks high-temperature strength.

• Stainless steel: Good overall properties, but standard grades lose mechanical strength rapidly at extreme temperatures.

• Nichrome: Composed primarily of nickel and chromium, this alloy is specially engineered to form a protective layer of chromium oxide when heated. It offers an exceptionally high melting point and incredible resistance to oxidation and scaling under intense heat. Therefore, it is highly suited for heating components and specific high-temperature engineering sections in gas turbine systems.

Step 4: Final Answer:
The correct alloy is Nichrome, corresponding to option (D).