MMET-281_SP_24_HW3

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Texas A&M University *

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281

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Chemistry

Date

Feb 20, 2024

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pdf

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1

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Homework 3 (40 points) MMET-281 Spring 2024 Due: Apr 1, 2024 at 5pm Basic Questions (2 points each 20 points) (Quiz) 1. What are the three most widely used classes of additive manufacturing processes in the aerospace industry? 2. What is a major disadvantage of selective laser melting? 3. What is a major process characteristic of additive manufacturing? 4. True or false: Vat photopolymerization is the only AM process family that has both scanning-type AM and full- layer AM processes. 5. What is the major difference between binder jetting and material jetting (i.e., PolyJet) 6. What is secondary additive manufacturing? 7. When creating ceramic products such as mugs, what is a major difference between slip casting and a jiggering process? 8. True or false: Ceramics cannot be injection molded. 9. What is the purpose of sintering a ceramic material? 10. True or false: CBN can be a good alternative to industrial diamonds in many cases. Independent Research Questions (20 points) (PDF document template on Canvas) 1. (5 points) Find or create a part that you think would not work for an additive manufacturing process. Present your part and explain why you think it could not be made using AM. 2. (5 points) Make a trade-off table comparing and contrasting the advantages and disadvantages additive versus formative manufacturing processes in the manufacturing of powder-based parts. 3. (10 points) Using Matweb, look up the properties of one natural ceramic, one carbide, and one nitride and make a properties table . A failure strength metric (tensile, flexure, etc.), hardness, thermal expansion coefficient, melting temperature, and creep temperature are the parameters of interest. Extra credit (+4 points) In HW 2, you had to explain three major differences between powder metallurgy and powder injection molding, assuming you are using a non-ferrous metal powder in each case. Starting with the previous problem answer, add laser powder bed fusion to consideration and discuss.
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