A corundum-mullite refractory material

A corundum-mullite refractory material Refractories and Industrial Ceramics Vol. 46, No. 1, 2005 UDC 666.762.11 1 1 1 T. M. Khranovskaya, N. N. Savanina, and O. P. D’yachenko Translated from Novye Ogneupory, No. 10, p. 31, October, 2004. Original article submitted August 24, 2004. A corundum-mullite material has been developed for service at high temperatures under heavy-duty load-car- rying conditions and in corrosive media. The material can be used to fabricate a wide range of industrial pro- ducts: burner stones, stools, stands, supports, protecting sleeves, etc. OTM-959-grade corundum-mullite material for service Tests were carried out on OTM-959 material components under conditions of high temperature, mechanical loading, at furnace temperatures of up to 1800°C in moist hydrogen, and corrosive medium has been developed. The material is nitrogen, and carbon-saturated atmospheres. Some compo- prepared from aqueous suspensions with the addition of a nents retained working capacity over a period of 1.5 years at granular filler at the stage of shaping. The major raw precur- 1400 – 1500°C and others, over a period of 2.5 years at sors are electrofused corundum and fused mullite, which are 1200°C. Burner stones for use in gas-fired furnace at tempe- readily available and not very much expensive materials, ratures up to 1650°C were in good service for 2 – 3 years. both maintaining strength at high temperatures. Stools, stands, covers, supports, faceplates, protecting Using an electrofused corundum in the presence of an sleeves and other operational articles have found application electrolyte, a highly concentrated aqueous suspension (a slip) under industrial service conditions. with a density of 2.7 – 3.0 gcm and good binding proper- As an example, Fig. 1 shows articles intended for work ties was prepared by wet grinding in a ball mill. under heavy-duty conditions as electric insulators and struc- Prior to shaping, a granular binder was added to the slip, tural load-carrying elements. and the mixture was thoroughly homogenized to a slurry and was cast into plaster molds. The green performs were dried and then sintered at 1450 – 1550°C in air. This technology showed very low (if any) sintering shrinkage, which made it possible to fabricate complex-shaped large-sized compo- nents with a mass of up to 60 kg. Depending on the compo- nent’s dimensions and service conditions, the amount of the granular filler and its fractional composition might vary. To enhance thermal stability, 5% graphite could be added to the precursor mixture. Properties of the OTM-959 material are given below: Apparent density, gcm ............. 3.08 – 3.11 Open porosity, %................. 16.1 – 16.5 Strength at 25°C, MPa: bending ......................17 – 25 compressive ..................100 – 180 Heat conductivity at 700°C, W(m  K) .........4.2 Tekhnologiya Research and Production Enterprise (Tekhnologiya Fig. 1. Operational articles fabricated from OTM-959 corundum- RPE), Obninsk, Kaluga Region, Russia. mullite material. 1083-4877/05/4601-0003 © 2005 Springer Science+Business Media, Inc. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Refractories and Industrial Ceramics Springer Journals

A corundum-mullite refractory material

1 page

Loading next page...
1 Page
Kluwer Academic Publishers-Consultants Bureau
Copyright © 2005 by Springer Science+Business Media, Inc.
Materials Science; Characterization and Evaluation of Materials; Materials Science, general; Ceramics, Glass, Composites, Natural Materials
Publisher site
See Article on Publisher Site

There are no references for this article.

You’re reading a free preview. Subscribe to read the entire article.

DeepDyve is your
personal research library

It’s your single place to instantly
discover and read the research
that matters to you.

Enjoy affordable access to
over 12 million articles from more than
10,000 peer-reviewed journals.

All for just $49/month

Explore the DeepDyve Library

Unlimited reading

Read as many articles as you need. Full articles with original layout, charts and figures. Read online, from anywhere.

Stay up to date

Keep up with your field with Personalized Recommendations and Follow Journals to get automatic updates.

Organize your research

It’s easy to organize your research with our built-in tools.

Your journals are on DeepDyve

Read from thousands of the leading scholarly journals from SpringerNature, Elsevier, Wiley-Blackwell, Oxford University Press and more.

All the latest content is available, no embargo periods.

See the journals in your area

Monthly Plan

  • Read unlimited articles
  • Personalized recommendations
  • No expiration
  • Print 20 pages per month
  • 20% off on PDF purchases
  • Organize your research
  • Get updates on your journals and topic searches


Start Free Trial

14-day Free Trial

Best Deal — 39% off

Annual Plan

  • All the features of the Professional Plan, but for 39% off!
  • Billed annually
  • No expiration
  • For the normal price of 10 articles elsewhere, you get one full year of unlimited access to articles.



billed annually
Start Free Trial

14-day Free Trial