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

Citations

Please use one of the following formats to cite this article in your essay, paper or report:

  • APA

    McDanel Advanced Ceramic Technologies LLC. (2019, April 25). Alumina and Sialon Raw Materials – Composition and Properties. AZoM. Retrieved on November 21, 2024 from https://www.azom.com/article.aspx?ArticleID=3167.

  • MLA

    McDanel Advanced Ceramic Technologies LLC. "Alumina and Sialon Raw Materials – Composition and Properties". AZoM. 21 November 2024. <https://www.azom.com/article.aspx?ArticleID=3167>.

  • Chicago

    McDanel Advanced Ceramic Technologies LLC. "Alumina and Sialon Raw Materials – Composition and Properties". AZoM. https://www.azom.com/article.aspx?ArticleID=3167. (accessed November 21, 2024).

  • Harvard

    McDanel Advanced Ceramic Technologies LLC. 2019. Alumina and Sialon Raw Materials – Composition and Properties. AZoM, viewed 21 November 2024, https://www.azom.com/article.aspx?ArticleID=3167.

Tell Us What You Think

Do you have a review, update or anything you would like to add to this article?

Leave your feedback
(Logout)
Your comment type
Submit

Sponsored Content

Editorial Highlights

The Current State of the Global Semiconductor Market

The Current State of the Global Semiconductor Market

The global semiconductor market has entered an exciting period. Demand for chip technology is both driving the industry as well as hindering it, with current chip shortages predicted to last for some time. Current trends will likely shape the future of the industry, which is set to continue to show

How are Graphene Batteries Made?

How are Graphene Batteries Made?

The primary distinction between graphene-based batteries and solid-state batteries lies in the composition of either electrode. Although the cathode is commonly changed, carbon allotropes can also be employed in fabricating anodes.

Newsletters you may be interested in

See all Newsletters »

Terms

While we only use edited and approved content for Azthena answers, it may on occasions provide incorrect responses. Please confirm any data provided with the related suppliers or authors. We do not provide medical advice, if you search for medical information you must always consult a medical professional before acting on any information provided.

Your questions, but not your email details will be shared with OpenAI and retained for 30 days in accordance with their privacy principles.

Please do not ask questions that use sensitive or confidential information.

Read the full Terms & Conditions.

Provide Feedback