Advanced Ceramics – Impervious and Porous Haldenwanger Engineering Ceramics

The Haldenwanger business of Morgan Advanced Materials is the producer of high temperature, fine ceramics.

Morgan offers:

  • Components with reduced wall thickness and therefore lower heat absorption
  • Components having higher thermal shock resistance allowing increased heating rates
  • Light, but mechanically strong and thermally stable kiln furniture, which is suitable for fast firing
  • Thin, self-supporting designs

Impervious Materials

Allsint 99,7

Best, high temperature, ceramic material for kiln construction with 99,7% Al2O3 (the difference is mainly MgO and SiO2).

  • Type C 799 according to DIN VDE 0335
  • Refractoriness up to 1700 °C  1.800
  • Good thermal shock resistance due to high thermal conductivity
  • High mechanical strength
  • High electrical resistivity

Recommended applications:

  • High working temperature, chemical attack, e.g. hydrogen and other reducing gases
  • Clean kiln atmosphere
  • Thin-walled designs having high thermal shock resistance

Pythagoras 1800 Z

Impervious, mullite high performance material

  • Refractoriness up to 1600 °C
  • Very high thermal shock resistance
  • High mechanical strength
  • High electrical insulation even at high temperatures
  • Evaporation extremely low, therefore no contamination of kiln atmosphere; no reaction with heating element
  • Most suitable material for radiant heating tubes
  • Kiln tubes made of Pythagoras 1800 Z can be very thin-walled

Pythagoras

Most economical, mullite material for kiln components

  • Type 610 according to DIN VDE 0335
  • Application temperatures up to 1400 °C
  • Very good chemical resistance against gases free of fluorine
  • For kiln working under normal conditions Pythagoras has a good thermal shock resistance and good mechanical strength.
  • Pythagoras is a very economical material being used as impervious protection sheaths and insulators for temperature measurement.

Halsic-I

Silicon infiltrated reaction bonded silicon carbide (SiSiC)

  • Reaction bonded SiC matrix, free of pores, with residual metallic silicon
  • High temperature ceramics for highest mechanical loads
  • Extremely good oxidation resistance
  • Large sized components possible
  • Application temperatures up to 1350 °C
  • Corrosion resistant against strong acids and alkaline solutions
  • High thermal conductivity

Halsic-S

Pressureless sintered silicon carbide (SSiC)

  • Dense sintered SiC matrix with very low percentage of closed pores
  • High temperature ceramics for extreme mechanical loads
  • Extremely good oxidation resistance
  • Application temperatures up to 1600 °C
  • Corrosion resistant against strong acids and alkaline solutions

Porous Materials

Alsint Porous

High purity, porous 99.5% Al2O3

  • Better thermal shock resistance than Alsint 99.7
  • Refractoriness is similar to Alsint 99.7
  • Similar chemical resistance to Alsint 99.7
  • Reducing gases, even pure hydrogen, do not attack Alsint porous.
  • Alsint porous is mainly used for the manufacture of ignition dishes and crucibles, but also for porous outer protection tubes for thermocouples.
  • Isostatic pressing is possible, so that large tubes can also be manufactured.
  • Muffle tubes

SKA 100 NG

High purity, porous 99.5% Al2O3

  • Refractoriness up to 1700 °C
  • High thermal shock resistance
  • Good chemical resistance
  • SKA 100 NG can be used in protection furnaces with reducing or even hydrogen atmospheres.

SKA 100 NG as well as Alsint:

  • Does not react with the heating elements, no contamination of the kiln atmosphere due to evaporation.
  • Is most suitable for the porous, outer protection tube for thermocouples that must withstand very strong chemical attacks.

Sillimantin 60 NG

A specially developed material for use in kiln manufacture having an Al2O3 content between 73 – 75%.

  • Low porosity
  • Good thermal shock resistance
  • No reactions with the heating elements
  • Working temperatures of up to 1650 °C
  • Special shapes possible for bridging long distances between supports
  • Excellent chemical resistance.
  • No contamination of the kiln atmosphere through evaporation.
  • Suitable for kilns with a high temperature gradient
  • Sillimantin 60 NG can be used under severe conditions as the outer protective tube in temperature monitoring devices.
  • Rollers for roller kilns

Sillimantin 60

Most frequently used ceramic material in kiln designs

  • Type C530 according to DIN VDE 0335
  • Application temperatures up to 1400 °C
  • Refractoriness up to 1300 °C (subject to loading for roller applications)
  • No reactions with heating elements
  • This material can be formed using most moulding methods.
  • Numerous special designs are possible as well as a wide range of standard tubes
  • This material is used successfully in laboratory and industrial kilns.

Sillimantin 65

A specially developed material for use as rollers having an Al2O3 content between 78 – 80%

  • Refractoriness up to 1350 °C (subject to operational loading)
  • Negligible reaction with glazes because of fine porosity

Sillimantin KS

Most economical for support tubes

  • Refractoriness up to 1300 °C
  • Good mechanical strength
  • Large scale production with emphasis on the most commonly used diameters permitting economical manufacture.

Silicon Carbide

Conventional, clay-bonded silicon carbide

  • Excellent thermal conductivity allows the manufacture of thick-walled components having high mechanical strength.
  • Furnace tubes with high thermal shock resistance
  • Can be used in oxidising atmospheres up to 1400 °C
  • High mechanical strength because of a large wall thickness
  • Sighting tubes for optical temperature measurement Outer protection tubes for temperature measurement up to 1200 °C in light and heavy metal smelts

Fused Silica

99.8% SiO2

  • Very low thermal expansion
  • Excellent thermal shock resistance
  • Can be used continuously at temperatures up to 1000 °C

This material is used for:

  • Rollers in glass tempering furnaces
  • Crucibles in high-frequency melting
  • Riser tubes for continuous casting
  • Crucibles withstanding high thermal shock

Halsic-R

Recrystallised silicon carbide (RSiC)

  • Compact SiC matrix with open porosity
  • Classic ceramic for high temperature applications
  • Large sized components possible
  • Reliable bonding of coatings
  • Application temperatures: 1600 °C (oxidising) and approx. 2000 °C (under protective atmosphere)
  • Resistant against strong acids and alkaline solutions

Halsic-RX

Chemically doped recrystallised silicon carbide (RSiCdoped).

  • Compact SiC matrix with open porosity
  • Very good oxidation resistance Multiple increased life time compared to Halsic-R
  • Ideal material for porcelain fast firing
  • Large sized components possible
  • Reliable bonding of coatings
  • Application temperatures up to 1650 °C (oxidising)

This information has been sourced, reviewed and adapted from materials provided by Morgan Advanced Materials.

For more information on this source please visit Morgan Advanced Materials.

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