Alumina and Sialon Raw Materials – Composition and Properties

McDanel Advanced Ceramic Technologies LLC is a leading manufacturer of high quality refractory tubes and sheaths, supplying major heat-using industries worldwide for over 80 years.

They offer high purity alumina, mullite, partially stabilized zirconia and sialon tubing. The impervious fine grained ceramic products are used in many applications where it is necessary to provide a protective atmosphere at high temperatures without contamination. Material selection depends upon operating working conditions such as peak temperature, chemical environment and abruptness of temperature change.

Various rods, tubes, crucibles, dishes, boats, trays and discs are standard items and a significant capability for producing custom shapes is available.

Alumina

Alumina (Al2O3) is one of the most versatile of refractory ceramic oxides and finds use in a wide range of applications.

Aluminas are generally more chemically resistant, harder, stronger and more refractory than mullite.

Composition

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

Material

99.8 Alumina

AP35
99 Alumina

AV30

Alumina

Al2O3

99.82%

99%

95.50%

Silica

SiO2

0.06%

0.7%

2.90%

Calcia

CaO

0.04%

0.03%

0.28%

Magnesia

MgO

0.035%

0.07%

1.10%

Iron oxide

Fe2O3

0.025%

0.07%

0.07%

Sodium oxide

Na2O

0.008%

0.05%

0.15%

Titania

TiO2

0.004%

-

-

Chromic oxide

Cr2O3

0.003%

-

-

Potassium oxide

K2O

0.001%

-

-

Boron oxide

B2O3

0.001%

-

-

Physical Properties

Table 2. Physical properties of McDanel Advanced Ceramic Technologies alumina grades.

Property

99.8 Alumina

AP35
99 Alumina

AV30

Bulk Density

3.91g.cm-3/244lb.ft-3

3.83g.cm-3 / 239lb.ft-3

3.72g.cm-3 / 232lb.ft-3

Open Porosity

0%

0%

0%

Flexural Strength at 20°C

380MPa/55ksi

345MPa / 50ksi

345MPa / 50ksi

Flexural Strength at 1000°C

165 MPa/24ksi

205 MPa / 30ksi

138 MPa / 20ksi

Compressive Strength at 20°C

3650MPa/530ksi

2550MPa / 370ksi

2100MPa / 305ksi

Thermal Properties

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

Property

99.8 Alumina

AP35
99 Alumina

SiAlON ST

Thermal Conductivity at 20°C

36W/m.K / 250BTU.in/ft2.hf.°F

29W/m.K / 201BTU.in/ft2.hf.°F

25W/m.K / 174BTU.in/ft2.hf.°F

Thermal Conductivity at 800°C

8.2W/m.K / 57BTU.in/ft2.hf.°F

7.2W/m.K / 50BTU.in/ft2.hf.°F

5.7W/m.K / 40BTU.in/ft2.hf.°F

Expansion Co-Efficient 20-1000°C

8.4x10-6/°C / 4.7x10-6/°F

8.4x10-6/°C / 4.7x10-6/°F

8.2x10-6/°C / 4.6x10-6/°F

Max Use Temp (no load)

1800°C / 3272°F

1800°C / 3272°F

1700°C / 3092°F

Source: McDanel Advanced Ceramic Technologies

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

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