Mullite Raw Materials from McDanel Advanced Ceramic Technologies

Mullites (3Al2O3.2SiO2) are refractory oxide materials combining low thermal expansion, good mechanical strength and resilience at elevated temperatures.

McDanel Advanced Ceramic Technologies LLC mullites are formulated to produce dense shapes, some in a glass matrix in order to yield maximum thermal shock resistance and good strength.

Composition of MV20 Mullite

Table 1. The compositions of mullite available from McDanel Advanced Ceramic Technologies.

Material

MV20

Alumina

Al2O3

55.2%

Silica

SiO2

41.9%

Calcia

CaO

0.3%

Magnesia

MgO

0.2%

Iron oxide

Fe2O3

0.8%

Sodium oxide

Na2O

0.4%

Titania

TiO2

0.5%

Potassium oxide

K2O

0.6%

Physical Properties of MV20 Mullite

Table 2. Physical properties of McDanel Advanced Ceramic Technologies mullite.

Property

MV20

Bulk Density

2.5g.cm-3/156lb.ft-3

Open Porosity

0%

Flexural Strength at 20°C

145MPa/21ksi

Flexural Strength at 1000°C

96MPa/14ksi

Compressive Strength at 20°C

655MPa/95ksi

Thermal Properties of MV20 Mullite

Table 3. Thermal properties of McDanel Advanced Ceramic Technologies alumina grades.

Property

MV20

Thermal Conductivity at 20°C

5W/m.K / 35BTU.in/ft2.hf.°F

Thermal Conductivity at 800°C

3.3W/m.K / 23BTU.in/ft2.hf.°F

Expansion Co-Efficient 20-1000°C

5.4x10-6/°C / 3.0x10-6/°F

Max Use Temp (no load)

1650°C / 3002°F

Grades and Applications of MV20 Mullite

Table 4. Grades and typical uses of mullite.

Grades

Typical Uses

MV20 is a dense mullite in a glassy matrix formulated to offer a high quality economical insulating tubing for thermocouple applications.

Insulators in oxidizing conditions for base and noble metal thermocouples used in conditions up to 1450°C.

MV30 is an extremely versatile and economical material. Its workability allows an extensive range and flexibility in fabrication. It is well suited for the casting of special shapes.

Thermocouple protection tubes, target and sight tubes, furnace muffles, diffusion liners, combustion tubes, radiant furnace tubes and kiln rollers.

Tolerances of MV20 Mullite Components

Table 5. Dimensional tolerances of mullite components

Material

To maximum outside diameter of:

25.4mm (1")

114.3mm (4 1/2")

152.4mm (6")

228.6mm (9")

Mullite

±5% or ±.65mm
±(0.025") min.

±3%

±4%

±5%

Standard camber tolerance is .794 mm (1/32")) per 305 mm (1 foot).
Standard strength tolerance is ±1.575 mm (1/16").
Tighter tolerances and non-catalog tolerances are provided by quotation.

Source: McDanel Advanced Ceramic Technologies

For more information on this source please visit McDanel Advanced Ceramic Technologies

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