Question

MULTIPLE CHOICE QUESTIONS

2. What are some of the advantages of powder metallurgy compared to typical bulk deformation, e.g. forging: (a) generally higher material strength, (b) generally better surface quality, (c) higher dimensional accuracy, (d) more material options, (e) higher production rate.

3. Which of the following surface processing methods are typically utilized to enhance the wear resistance of materials: (a) nitriding, (b) zinc electroplating, (c) electropolishing, (d) anodizing, (e) physical vapor deposition, (f) galvanizing.

Please help with these MC questions. Thanks!

Answer 1

Solution 2:

Advantages of powder metallurgy over bulk deformation are Better surface quality, higher dimensional accuracy,more material options & high production rate. this is because in case of bulk deformation like forging surfaces often get damaged due to sudden impact and precise dimensional control cannot be achieved as it is carried at macroscopic level where macroscopic forces are used directly for deformation. Also, powder mettalurgy is flexible in sense that all materials cannot undergo bulk deformation( like brittle ones). Moreover bulk deformation is carried discretely while powder mettalurgical operations allows multiple materials to be treated simultanously giving high production rate.

Solution3:

Nitriding is used for increasing hardness of materials hence increasing wear resistance of materials, rest process are used for increasing corrosion resistance of materials.