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2003 Course Powder Metallurgy

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Total No. of Questions : 12] P1324 [Total No. of Pages : 3 [3764]-176 B.E. (Prod. & Ind. Engg.) POWDER METALLURGY (411085) (2003 Course) 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) Powder Metallurgical technique is Indispensable for certain types of products. Explain. [8] b) Compare & contrast the testing procedures for fused & sinter metal products (Cast & P/M products). [8] OR Q2) a) Describe briefly the effects of powder characteristics on the strength & density of P/M parts. [8] b) Discuss the merits & demerits of powder metallurgy technique for shaping. [8] Q3) a) Explain the role of different factors on the degree of compaction of a metal powder.To what extent can the theoretical density be approaches by compacting? [8] b) Write in brief about the basic components of the compacting tools for most P/M products. [8] OR Q4) a) Describe the process, types, advantages & shortcomings of heat treatment. Give some of its applications. [8] P.T.O. b) Write short note on following : i) Role of lubricants in die compaction. ii) [8] Die design. Q5) a) What is Sintering? Explain the stages of Sintering. [6] b) Why do green compacts Shrink during Sintering? Discuss the factors that determine the amount of Shrinkage in a compact. [6] c) What are the pre-requisites of a Sintering furnace? Describe the essential [6] parts of a Sintering furnace. OR Q6) a) Critically discuss various theories of Sintering. [6] b) What is liquid-phase Sintering? Explain its stages & advantages & applications in industry. [6] c) What are the functions of a Sintering atmosphere? What atmospheres are used for Sintering metal powder parts? [6] SECTION - II Q7) a) What are the advantages of Isostating pressing? Describe the wet & dry bag tooling methods of Isostatic pressing. [10] b) Compare & contrast the roll compaction & Die compaction. [6] OR Q8) a) What are the advantages & shortcomings of hot Isostatic pressing? Give some applications also. [6] b) Write short note on following : i) Polymer blends. ii) [10] P/M forging. Q9) a) Describe with the help of a flowsheet the production of tungusten carbide powder. [8] b) What are the advantages of porous bearings? Describe their production in brief. [8] OR [3764]-176 -2- Q 10) a) Discuss the manufacturing of carbide-tipped tools by P/M method. Describe its properties & uses also. [8] b) Write short note on following : i) Self lubricated bearings. ii) [8] Electrical contact material. Q11) a) Why is heat treatment of P/M parts done? [6] b) What are the different processes employed for finishing P/M parts? [6] c) Why has Machining of P/M parts become a necessity? Outline the general rules you would adopt for machining of the Sintered parts. [6] OR Q12) Write short note on following : [18] a) Near net-shape. b) Production of nano composites. c) Quality & economics of P/M components. rrrr [3764]-176 -3-

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