Table 1 Reinforcements and stir casting process parameters factor and levels.

From: Development, modelling and optimization of process parameters on the tensile strength of aluminum, reinforced with pumice and carbonated coal hybrid composites for brake disc application

S/N

Processing factors

Unit

Factors designation

Level

1

2

3

4

1

Brown pumice

wt%

BP

2.5

5

7.5

10

2

Coal ash

wt%

CA

2.5

5

7.5

10

3

Stirrer speed

rpm

SS

200

300

400

500

4

Pouring temperature

°C

TP

700

750

800

850

5

Stirring duration

min

SD

5

10

15

20

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