engleski

Porosity of ceramic shell molds

It is established that the open porosity of the uncalcined (wet) ceramic shell mold on the basis of quartz sand and liquid glass is 12 ... 14% (by volume), after heating to 950-15 °C and cooling with oven to 20... 25 °C - 18 ... 27% (by volume). The increase in porosity in the calcined ceramic shell mold is due to the appearance in it of new capillary channels. The appearance of such capillary channels is caused by thermal expansion-compression of the material of the mold during its heating and subsequent cooling.

porosity ; ceramic shell molds ; thermal expansion-compression

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