Abstract
The dried silica gel monolith with micropores of about 160Å in the average diameter, prepared by the sol-gel method from the Si(OCH3)4-H2O-CH3OH-(CH3)2NCHO-NH4OH solution, has been tested for the crack formation on immersion in water after heating to various temperatures up to 1030°C. A few cracks occurred in as-dried gel before heating, while severe fine cracks were observed in the gels heated to 500° or 700°C. A rise in heating temperature up to 850° or 900°C resulted in gels with no cracks, while a few cracks occurred on heating to 1000° or 1020°C. No crack was observed when the gel was converted to glass with no open pores by heating to 1030°C. The occurrence and the degree of severity of crack formation have been discussed on the basis of the change of the size of fine pores, and the strength of silica skeleton with heating temperature.
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