ISSN:
1573-9139
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Conclusions Up to 300°C chamotte does not react with orthophosphoric acid. In the range 300–800°C crystallization of the type SiO2·P2O5 occurs. With further increase in temperature the silicophosphate dissolves, and at 1030°C is converted from the low- to the high-temperature form, and at 1200°C it changes completely into the melt. Starting from 500°C the mullite decomposes. The intensity of the mullite line at 1400°C is slight. In the range 700–1000°C a large quantity of liquid phase, formed during decomposition of the silicophosphates and mullite, sharply depresses the refractoriness-under-load and increases their shrinkage. At 1200°C AlPO4 crystallizes in the cristobalite form. An increase in the quantity of AlPO4 increases the refractoriness-under-load of the specimens. Mixtures of chamotte and orthophosphoric acid after firing at 1400°C contain (in reducing order) AlPO4 (cristobalite form), cristobalite, mullite, and quartz; they may be recommended as low sintering mortars.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01296202
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