Investigation of Various Properties of Zircon and of Stabilized Zirconia at Elevated Temperatures, I–III

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Abstract
The reactions of zircon and of stabilized zirconia in contact with each of fourteen commercial refractories at temperatures ranging from 2400° to 3600°F. were studied. A heating schedule of 4 hours with 1 hour at maximum temperature was used, and the safe upper limits to avoid reaction between both zirconia and zircon and the various refractories were established. To correlate this information with commercial high‐temperature furnace installations, tests were made to determine the heat‐transfer rates through stabilized‐zirconia brick of both the dense and the insulating types. The hot‐load resistance of the commercial refractories was determined, using a small oxyacetylene‐fired furnace in which 1‐in.‐cube samples were heated from all sides under a 25–1b. load. Studies were made of the effect on hot‐load resistance of variations in (a) load, (b) holding temperature, and (c) dimensions of the test piece. Other tests were designed to demonstrate the large increase in hot‐load resistance obtained when the specimen was heated from one side only, as in a furnace wall.

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