Page 162 - Module DMV20173

8.0 POWDER PROCESSING

SUMMARY

In this chapter we have studied that :

1. powder processes is a net-shape forming process consisting of producing metal
powders, blending them, compacting them in dies, and sintering them to impart
strength, hardness, and toughness;
2. the powder processes is capable of producing relatively complex parts

economically, in net-shape form, to close dimensional tolerances, and from a wide
variety of metal and alloy powders;
3. secondary and finishing operations may be performed on powder processes parts
to improve their dimensional accuracy, surface finish, mechanical and physical
properties, and appearance;

4. ceramics are particularly attractive for applications such as heat-engine
components, cutting tools, and components requiring resistance against wear and
corrosion;
5. ceramic processing generally started with crushing and milling of raw materials

and mixed with additive materials to enhance powder characteristics;
6. the next important processes are shaping and forming which involve with slip
casting, extrusion, pressing and injection moulding;
7. after drying, green machining applied to form desired ceramic shape before

sintered at elevated temperature;
8. ceramic processing subsequently may be subjected to further processing to
produce the final desired shapes.

REFERENCES

1. S. Kalpakjian, S.R. Schmid, Manufacturing Engineering and Technology 5 edition,
th
Prentice Hall, 2005.
2. Reed James, Principles of Ceramic Processing

BPLK 194 DMV 20173