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1997 Course Powder Metallurgy

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Total No. of Questions :8] [Total No. of Pages : 2 P1129 [3864] - 25 B.E.(Prod. S/W) POWDER METALLURGY (1997 Course) (411085) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) Answer any three questions from each section. 2) Answers to the two sections should be written in separate books. 3) Neat diagrams must be drawn wherever necessary. 4) Figures to the right indicate full marks. 5) Use of logarithmic tables, slide rule, Mollier charts, electronic pocket calculator and steam tables is allowed. 6) Assume suitable data, if necessary. SECTION - I Q1) a) What is powder metallurgy? Discuss in brief some of the modern developments in powder metallurgy. [8] b) Briefly discuss the advantages & limitations of structural parts produced by P/M techniques. Compare the P/M method with other fabricating methods. [8] Q2) a) What is meant by metal powder characteristics? Discuss the chemical, physical & technological characteristics of metal powders. [8] b) Describe the various methods used for the determination of particle size & particle size distribution of powder. [8] Q3) a) Critically explain the technology of production of iron powders by reduction, electrodeposition, thermal / carbonyl decomposition & atomisation methods. [8] b) What is blending or mixing? It is extremely desirable in the production of [8] P/M parts, explain in brief. P.T.O. Q4) Write short notes on following (any three): a) Powder conditioning. b) Powder compaction. c) Production of ultrafine powders. d) [18] Flow sheet of electrolytic process. SECTION - II Q5) a) Explain the role of different factors on the degree of compaction of a metal powder. To what extent can the theoretical density be approached by compacting. [8] b) What are the factors that are required to be considered for a die design? Does the die design impose any limitation on the compacting load? Explain. [8] Q6) a) Compare & contrast hot compacting with cold die compacting. Do you expect any variation in compact strength & other properties in compacts obtained by both these two methods. [10] b) What is sintering? Explain the stages of it. [6] Q7) a) Why should the sintering furnace atmosphere be controlled? What atmospheres are generally used & how are these maintained / created? [8] b) Discuss the steps involved in the production of self lubricating bearings. What are their fields of application? [8] Q8) Write short note on following (any three): a) Sintered metal friction materials. b) Flowsheet of production of tungusten carbide powder. c) Ferrites. d) Heat treatment of P/M parts. e) Finishing P/M parts. jjj [3864]-25 2 [18]

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