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Recently Asked powder metallurgy Questions
Expert help when you need it- Q1: Question 9. (a) What are the three major reactions that occur during chain polymerization?(b) What are two methods by which a linear chain polymerization reaction can be terminated? (5 points)See Answer
- Q2: Question 8. Using Pauling's equation (in Chapter 2), compare the percent covalent character of the following compounds: hafnium carbide (HfC), titanium carbide (TiC), tantalum carbide (TaC), boron carbide (BC), and silicon carbide (SiC).(5 points)See Answer
- Q3: What safety gear should be used when operating the table saw?See Answer
- Q4: Question 7. The nose cap and the wing leading edges of the space shuttle may reach temperatures of up to1650°C. (a) Would the silica fiber compound (HRSI) be a suitable candidate for these sections of the shuttle?(b) If not, select a suitable material for this location. (c) List the important properties of the selected material that satisfy the design needs.(5 points)See Answer
- Q5: Question 4. An austenitized 4340 standard steel bar is cooled at different rates (see Figure 2).Predict what will be the constituents in the microstructure of the bar at 200°C for the following cooling rates:(6 points) (a) 5°C/s (51-mm from the quenched end of a Jominy bar) (b) 8°C/s (19.0-mm from the quenched end of a Jominy bar) (c) 50°C/s (9.5-mm from the quenched end of a Jominy bar) See Answer
- Q6: Question 5. A metal-matrix composite (MMC) is made of a 6061-Al alloy matrix and continuous boron fibers.The boron fibers are produced with a 15.5 um diameter tungsten-wire core that is coated with boron to make a final 107 um diameter fiber. A unidirectional composite is made with 63 vol % of the boron fibers in the Al6061 matrix. Assuming the law of mixtures applies to isostrain conditions, calculate the tensile modulus of the composite in the direction of the fibers. Data are EB = 370 GPa, Ew = 410 GPa, and EAI = 70.4 GPa. (5 points)See Answer
- Q7: Question 6. Calculate the average molecular weight Mm for a thermoplastic that has the following weight fractions fi for the molecular weight ranges listed:(5 points) See Answer
- Q8: Question 3. Figure 1 illustrates the deformation mechanisms in polymers. (4 points) (a) Which mechanism is dominant in the stretching of a rubber band? (b) Which mechanism(s) represent plastic deformation? (c) Which mechanism is pronounced in polyethylene above its glass transition temperature? (d) Which mechanism is associated with the highest elastic modulus? See Answer
- Q9: List the similarities and differences of forging and compacting metal powders.(Graduate students only)See Answer
- Q10: Describe the features of a screw extruderand its functions.See Answer
- Q11: Are there applications in which you, as a manufacturing engineer, would not recommend a PM product? Explain.See Answer
- Q12: Compare thermoplastics and thermosets in terms of material properties and its effect on the possible manufacturing process that can be used to create parts from each material.See Answer
- Q13: Describe the blow molding process in terms of its steps, capabilities, type of materials used, and final products.See Answer
- Q14: Why is there density variation in the compacting of powders? How is it reduced?See Answer
- Q15: Explain why the mechanical and physical properties of PM parts depend on the powder distribution, shape, and size.See Answer
- Q16: The axisymmetric part shown in the accompanying figure is to be produced from fine copper powder and is to have a tensile strength of150 MPa. Determine the compacting pressure and the initial volume of powder needed 25Dimensions in mm해야12-20→25See Answer
- Q17: Explain why in rotational modeling we only can create thin-walled parts.See Answer
- Q18: Name the various methods of powder production and list what is the major features for each method.See Answer
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