PermAmelt Thermocouple Protection Tube / Temperature Sensors, Instruments and components/ Products/Tashika-Japan

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PermAmelt Thermocouple Protection Tube

New Engineering ceramic for use in molten Aluminum

FEATURES:

Quick response
Maintenance free
Prolonged Service life
High oxidation resistance
No contamination of the bath
Excellent thermal shock resistance
Low thermal expansion coefficient
No corrosion from molten alumina
High strength up to 1,000°C covering the range of molten aluminum.

DESCRIPTION:
Closely resembling to metal, PermAmelt is a new unique engineering ceramic. it is good choice as thermocouple protection tubes and immersed heater protection tubes for use in molten aluminum baths, even where there are rapid temperature fluctuations. Due to impermeable and non-wetting surface of PermAmelt, the thermocouples assemblies need no daily washing or coating thereby proving use maintenance free use in molten aluminum baths, much longer than any other protection tube material.

PermAmelt thermocouple protection tubes require no preheating due to their low thermal expansion coefficient and thermal shock resistance. Their low heat conductivity helps to prevent temperature drop in the molten aluminum bath and contributes to energy conservation. Since the tubes are of ceramic material, there is no iron pick-up to create inclusion in the aluminum.

TECHNICAL PROPERTIES OF PERMAMELT

BULK DENSITY(g/cm³)/ ( RELATIVE DENSITY %)	3.10~3.15/ (97~98)
BENDING STRENGTH (Kg/mm²) At Room Temp. At 1,000°C At 1,200°C At 1,400°C	60~70 40~45 30~35 —
COMPRESSIVE STRENGTH (Kg/mm²) At Room Temp.	170~190
YOUNG’S MODULES (x10Kg/mm²) At Room Temp.	2.9~3.1
POISSON’S RATIO	0.24~0.25
K1C-VALVE (MN/m^3/2) [FRACTURE TOUGHNESS]	5.3
VICKERS HARDNESS (Kg/mm²) AT ROOM TEMP.	1400~1550
FRICTION FACTOR (CERAMICS TO CERAMICS)	0.6
THERMAL EXPANSION COEFFICIENT (x10^-7/°C)	33~35
THERMAL CONDUCTIVITY (Kcal/mh°C) AT 100°C	16~17
THERMAL SPALLING RESISTANCE (°C)	750~800
WEIGHT INCREASE BY OXIDATION IN AIR (mg/cm²) AT 1,200°C x 24 hours AT 1,400°C x 24 hours	0.2~0.5 _
ELECTRICAL RESISTIVITY (W·cm) At Room Temp. At 1,000°C	>10¹⁶ 10¹³~10¹⁴

STANDARD SIZES (in mm)

O.D(mm)	I.D(mm)	LENGTH(mm)
11.5	6.5	300	400	500	600	700	800	900	1000	1100
15	9
22	14
28	16
32	20

CORROSION RESISTANCE AGAINST MOLTEN METALS

METAL/Temp.	(720 hours)
Tin 300°C
Lead 450°C
Zinc 550°C
Aluminum 800°C
Copper 1,200°C

CHEMICAL STABILITY

Chemical	HF	HCL/ HNO₃	HCL		HNO₃		H₂SO₄		H₃PO₄	NaOH
Strength	10%	3/1	36%	20%	61%	25%	95%	30%	85%	30%
At Room Temp.
At Boiling Point	-	-	-			-		-

Color Code for Chemical & Corrosion resistance

No change (decreased strength 0%)

Slight change (<30%)

Change (<50%)

Considerable change (>50%)

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