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.
Refractories and Industrial Ceramics – Springer Journals
Published: May 10, 2005
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