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Table of Ceramic Materials Performance | Name | Steatite Ceramic | Cordierite Ceramic | Mullite Ceramic | 95% Alumina Ceramic | 99% Alumina Ceramic | ||||
Properties | Symbol | Units | C221 | C520 | C610 | C795 | C799 | |||
Open (apparent) porosity, maximum | ρa | Vol% | 0 | 20 | 0 | 0 | 0 | |||
Bulk density, minimum | ρa | Mg m-3 | 2.7 | 1.9 | 2.6 | 3.5 | 3.7 | |||
Flexural strength, minimum | Unglazed | Ϭft | MPa | 140 | 30 | 120 | 280 | 300 | ||
Glazed | Ϭfg | MPa | — | — | — | — | — | |||
Modulus of elasticity, minimum | E | GPa | 110 | 40 | 100 | 280 | 300 | |||
Mean coefficient of linear thermal expansion | α30–100(30 ℃ to 100℃) | 10–6 K–1 | 6 to 8 | 1.5~3.5 | 5~6 | 5~7 | 5~7 | |||
α30–300(30 ℃ to 300℃) | 10–6 K–1 | 7 to 9 | 1.5~3.5 | 5~6 | 6.5~7.5 | 6~8 | ||||
α30–600(30 ℃ to 600℃) | 10–6 K–1 | 7 to 9 | 2~4 | 5~7 | 6~8 | 7~8 | ||||
α30–1000(30 ℃ to 1000℃) | 10–6 K–1 | 8 to 10 | 2.5~5 | 5~7 | 7~9 | 7~9 | ||||
Resistance to thermal shock, minimum | △T | K | 100 | 300 | 150 | 140 | 150 | |||
Electric strength, minimum* | Ed | kV mm-1 | 20 | — | 17 | 15 | 17 | |||
Withstand voltage, minimum | U | kV | 30 | — | 25 | 18 | 20 |