Characteristic

Porous ceramics are ceramics that have countless pores inside.
Ceramics have low thermal conductivity due to their porous nature, are lighter than metals, and have high heat resistance and thermal shock resistance.

Maruwai Yano Ceramic Works can provide large-scale porous ceramic production.
Maximum production size Φ720×1260H (for porous alumina crucible)

Shape/Application

  • Crucible and pod for vacuum melting
  • Thermal shock resistant material products, insulation parts, melting furnace parts
  • Tamman tube/sleeve/tube/pipe
  • Setter/heart plate
  • fireproof nozzle

Porous ceramics properties table

Alumina

product name A-PU99 A-PU98 A-PU96 A-PU93 A-PU85
Material Alumina99.5% Alumina98% Alumina96% Alumina93% Alumina85%
main component Al2O3
purity
(%)		 99 98 96 93 85
Bulk specific gravity
(g/cm3)		 2.9 3.2 3.1 2.9 2.8
porosity
(%)		 25 18˜20 18˜20 23˜25 20˜22
Thermal conductivity
(W/m･K)		 3.5 3.5 3.4 2.7 2.4
bending strength
(Mpa)		 9˜12 27˜30 30˜33 12˜18 12˜15
thermal expansion coefficient
( 20~1000℃)×10-6/K) )		 7.1 7.5 7.2 7 5.5
Fire resistance
(℃)		 2050 2000 1970 1800 1750
Safe use temperature
(℃)		 1850 1800 1700 1650 1600

Mullite･magnesia･zirconia･silica

product name A-PU69 M-PU99 M-PU98 Z-PUC-F4 S-PU08
Material Alumina69% magnesia99% magnesia98% zirconia silica
main component Al2O3/SiO2 Mgo ZrO2 SiO2
purity
(%)		 69/30 98.8 98 95 93
Bulk specific gravity
(g/cm3)		 2.5 3 2.9 4.4 1.8
porosity
(%)		 24˜27 16˜18 20˜22 18˜20 17˜19
Thermal conductivity
(W/m･K)		 2.1 4.1 3.9 0.8 2.3
bending strength
(Mpa)		 15˜18 13˜16 8˜12 15˜20 10˜14
thermal expansion coefficient
( 20~1000℃)×10-6/K) )		 4.5 12.5 12.3 5.9 1.3
Fire resistance
(℃)		 1700 2650 2200 2550 1300
Safe use temperature
(℃)		 1550 1900 1800 1900 1200