Fabrication of Highly Porous Alumina-Based Ceramics with Connected Spaces by Employing PMMA Microspheres as a Template

Table 1

Compositions of slurries used for slip-casting.

Sample	Al2O3	PMMA microsphere		MgO	SiC	SiO2	Water	Theoretical porosity
	(g)	Mean particle size (𝜇m)	g	(g)	(g)	(g)	(mL)	(%)
P20NONE	15	22.6	10	0			7.0	68.9
P60NONE		62.2					7.2	68.9
P90NONE		96.7					7.5	68.9
P20MgO(1)		22.6		0.1	0		7.5	68.7
P20MgO(3)		22.6		0.3		0	8.5	68.5
P60MgO(1)		62.2		0.1			8.0	68.7
P90MgO(1)		96.7					8.5	68.7
P20SiC(1)		22.6		0	0.1		7.0	68.8
P20SiC(3)		22.6			0.3		7.0	68.4
P20SiO2(4.5)		22.6		0	0	0.45	7.5	67.8

200 𝜇l polyvinyl alcohol, 200 𝜇l polycarboxylic acid ammonium, and 0.1 g polyethylene glycol were added to each slurry.