CHAPTER 9

1) Briefly describe the powder metallurgy technology and explain briefly three (3) methods of production of metallic powder.

(2 marks)

2) What are the production steps involved in making powder-metallurgy parts and describe what happens during the sintering process.

(2 marks)

3) Porosity is a unique and inherent characteristic of powder metallurgy technology which needs secondary operation such as Impregnation and infiltration. What the differences between both processes?

C03/C4 (3 marks)

4) Sketch the condition of the metal powder particles after the production of metallic powder:

i) Blending,

ii) Compacting, and iii) Sintering.

(1 mark)

5) Powder metallurgy (P/M) application enables the manufacturing of small, intricate partsof high precision resulting in high density, net-shape and the elimination of scrapduring the process. Describe some of the characteristics of the metal powders to beconsidered in P/M.

(4 marks)

6) Briefly explain the importance of additives such as lubricants, binder and deflocculants in powder melallurgy process.

(2 marks)

7) Define the following terms with reference to powder metallurgy process.

i) Infiltration

ii) Impregnation

(4 marks)

8) Briefly describe the powder metallurgy technology and explain briefly three (3) methods of production of metallic powder.

(4 marks)

9) What are the production steps involved in making powder-metallurgy parts and describe what happened during the sintering process.

(3 marks)

10) Powder metallurgy (P/M) applications enable the manufacturing of small, intricate partsof high precision resulting in high density, net-shape and the elimination of scrap duringthe process. Discuss the importance of each of the following processes:i) Mixing and blendingii) Compactingiii) Isostatic compressioniv) Sintering

(6 marks)

11) Powder Metallurgy process can make parts which other manufacturing processes are unableto carry out. Hard cutting tools, small gears and refractory parts are some of the examples ofpowdered parts.i) Describe briefly the powder metallurgy process.ii) What are the advantages of powder metallurgy process over other manufacturingprocesses of casting or forging?

(4 marks)

12) Differentiate the method of Conventional Compaction and lsosatic Pressing in PowderMetallurgy processing. Support your answer with sketches.

(6 marks)