Page 161 - Module DMV20173

8.0 POWDER PROCESSING

(a) (b)
Figure 8.8 Shrinkage of ceramic product from (a) green body to (b) sintered body

Example 8.5:
What is the disadvantage of shaping operations after sintering process.
Solution:
Ceramic product becomes refractory after sintering process. Thus, it is very hard to
reshape the product.

8.3.7 FINISHING OPERATIONS

1. In order to produce near net shape product and enhance material
properties, post processing operations is employed to eliminate
unnecessary voids.
2. Process selection is an important consideration because of the brittle

nature of most ceramics and the additional costs involved in some of these
processes.
3. The finishing processes employed can be one or more of the following
operations:
a) Grinding (using a diamond wheel)

b) Lapping and honing
c) Ultrasonic machining
d) Drilling (by using a diamond-coated drill)
e) Electrical-discharge machining

f) Laser-beam machining
g) Abrasive water-jet cutting
h) Tumbling (to remove sharp edges and grinding marks)

BPLK 193 DMV 20173