Ceramic Tube & Rods

CERAMIC TUBE & ROD MATERIAL COMPARISON CHART

			Mullite	Alumina	Zirconia
PROPERTIES	UNITS	TEST	3AL2O3 •2SIO2	Al 99.8%	MPSZ	YTZP
Physical Properties
Density	grams/cc	ASTM C20	2.80	3.92	5.72	6.02
Color			Tan	Ivory	Ivory	Ivory
Permeability			Gas-Tight	Gas-Tight	Gas-Tight	Gas-Tight
Mechanical Properties
Elastic Modulus Typical 20º C	GPa(psi•106)	ASTM C848	150 (22)	370 (54)	200 (29)	210 (30)
Flexural Strength (MOR) Typical 20º C Typical 1000º C	MPa (kpsi)	ASTM F417	170 (25) 151 (22)	375 (54) 210 (30)	620 (90) –	900 (130) –
Compressive Strength Typical 20º C	MPa (kpsi)	ASTM C773	550 (80)	2500 (363)	1750 (254)	2500 (363)
Fracture Toughness Range	MPa•m1/2	NOTCHED BEAM	2	4 - 5	11	13
Hardness	NEWTONS GPa(Kg/mm2)	ROCKWELL 45N KNOOP 1000g	70 7.4 (750)	83 14.1 (1440)	77 11.8 (1200)	81 12.7 (1300)
Thermal Properties
Thermal Conductivity 20º C	W/mºK	ASTM C408	3.5	30.0	2.2	2.2
Coefficient of Thermal Expansion 25 to 1000º C	10-6/ºC (10-6/ºF)	ASTM C372	5.3 (2.9)	8.2 (4.6)	10.1 (5.6)	10.3 (5.7)
Specific Heat at 100º C	j/kgºK (cal/g/ºC)	ASTM E1269	950 (0.23)	880 (0.21)	400 (0.14)	400 (0.10)
Thermal Shock (Note 1)	DºC(DºF)	DTc	300 (570)	200 (392)	350 (660)	350 (660)
Electrical Properties
Dielectric Strength 6.25 mm Thickness	AC-kv/mm (AC-volts/mil)	ASTM D116	9.8 (248)	8.7 (220)	9.4 (240)	9.0 (228)
Dielectric Loss	25ºC@1MHz 25ºC@5GHz	ASTM D2520	0.002 –	< 0.0001 < 0.0001	0.001 –	0.001 –
Volume Resistivity 25º C 500º C 1000º C	ohm-cm	ASTM D1829	> 1014 5 x 1012 3 x 105	> 1014 2 x 1010 5 x 107	> 1013 2 x 105 < 103	> 1013 2 x 104 < 103
Dielectric Constant	25º C@1MHz		6.0	9.8	28.0	29.0
General Characteristics			Good thermal shock resist-ance NOT recommended for high temp. vacuum application (low cost)	Hard, corrosive resistant, capable of withstanding use at high temperature, low dielectric loss at microwave frequencies	Impact resistant, high strength, polishes easily	Oxygen ionic conductive, extreme temper-ature resistant

This chart is intended to illustrate typical properties of
advanced ceramic materials available from Ortech Ceramics..
The information set forth herein is offered for comparison
only, and is not to be construed as absolute engineering data
or constituting a warranty or representation for which we
assume legal responsibility.

Note 1: Thermal Shock Resistance – Tests are run by quenching
samples into water from various elevated temperatures.
The change in temperature where a sharp decrease in flexural
strength is observed is listed as delta Tc.

Material Characteristics Chart


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