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/m3/2) [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. (D)

30 30 30 30 30 30 30 20 20 20 40

I.D. (d)

20 20 20 20 20 20 20 14 14 14 30
Length (L) 400 500 600 700 800 900 1000 400 500 600 1300

         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%)

For further information please Email us at: sales@tashika.co.jp

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