PROPERTIES OF SANDSTONES AS A REFRACTORY MATERIAL* |
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| Authors: | Tai Chen ShenC-en Hu |
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| Affiliation: | 1. Research Laboratory, Electrochemical. and Metallurgical Works, N.R.C., Chungking. China;2. Research Laboratory, Electrochemical. and Metallurgical Works, N.R.C., Chungking. China Author Note: In the early days of the last war when we had no refractory manufacturers in Chungking. China, sandstones were the all-purpose refractory. Even now, they are an important material owing to their generally satisfactory application. |
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| Abstract: | Sandstories from Chungking were tested for their properties as a refractory material. Chemical, petrographical, rational, and sieve analyses were made; properties, such as porosity, refractoriness, specific gravity, thermal expansion, and resistance to spalling. were determined; and studies were made on changes in firing up to 1550°C. No inversion of the quartz grains in the rock into tridymite or cristohalite could be detected. The interstitial clay substances fused first, and the quartz grains then dissolved gradually into the glassy matrix on firing at high temperatures. Being free from mineralogical and structural changes, unusually low in thermal expansion and porosity, and good in spalling resistance after firing at high temperatures, sandstones are shown to be an excellent refractory if properly employed. Of the two kinds of rocks, the dense and the porous, the former was found much better in test for refractoriness under load. Prefiring of the material before lining in a furnace structure is desirable to eliminate the permanent expansion and to improve the resistance to spalling in the raw state. |
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