On the one hand, you have aggressive melts, thermal loads in excess of 1.000 °C, and temperature gradients of several hundred degrees. One the other, there is the need for maximum process reliability, plant availability, energy effi ciency, and melt purity. The result is a requirement profi le that is more than a match for conventional materials.

To reconcile these demands, titanate aluminium has been developed. It is a ceramic material that distinguishes itself by a unique combination of thermal and physical properties. High-purity aluminum oxide and titanium oxide are combined into a microporous material via a precision-controlled reaction sintering process.

Characteristics:

- Low thermal conductivity
- Low thermal expansion
- Excellent thermal shock behavior
- Good corrosion resistance
- Outstanding temperature resistance
- No or little wetting by most molten metals

 

MATERIAL	MgO Magnésia	BN boron nitride	SiC Silicium carbide	SiN Silicium nitride	Ti3Al Aluminium titanate	AlN Aluminium nitride
Ref	MG2300	NB HD	SIC2500	SIN1300	ALU-TIT T	AlN140	AlN180
Purity	MgO	BN	SiC	SSN	Al2TiO5
Main characteristics
Densityg/cm3	2,5	2.2	3,1	3,2	3,35	3,24	3,31
	2,8		3,2	3,22
Open porosity %	20	0	0	0	12,5
	30
Particle size µm	70	-	1	5	> 0,2
Mechanical characteristics 20 °C
Hardness vickers HV10 N/mm²	-	190	2500	1600
Compressive strength N/mm²	800	160	2900	2500		2100	2000
Flexural strength N/mm²	165	32-46	430	750	25	350	>300
Modulus of elasticity Gpa	250	58-83	440	300	17	310	310
Thermal characteristics
Max use Temp °C	2300	1600	1800	1300	1000
Specific heat 20°C J/kg°K	-	1960	1000	700
Thermal cond. 100°C W/mK	-	49	90	35	1,4	140	180
Thermal expansion 20-1000°C 10-6 /K-1	13,5	8	4,1	3,3	< 1 (20 à 600°C)	5,6	5,6
Electrical characteristics
Resistivity  20°C Ohmcm	10^14	5^12	10^2	10^12	50.10^8	>10^12	>5x10^12
Resistivity  500°C Ohmcm	10^10	-	-	-
Resistivity  1000°C Ohmcm	10^7	10^9	0,2	10^7
Dielectric strength  kV/mm	9	39	-	-		> 25	> 20