鑄物用粘土微粒子の硏究（第2報）
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概要
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In the first report the author has investigated the size and distribution of clay particles produced in Kasuya (Fukuoka Prefecture) and Goto (Nagasaki Prefecture). In this report the authors has attempted to measure the permeability and bond strength of silica sand of uniform grain (60∼80 mesh) by addition of various grain size of clay particles and moisture. The clay particles are consisted of the silt part (10∼50μ), clay part (2∼10μ) and colloidal part (under 1μ). The result of investigation on the permeability of these moulding sand, it was found that the additin of moisture has an excellent effect up to 4∼6% for the separated fine clay content is constant, and the permeability is good in case of particle size is 5∼10μ. The bond strength does not shows any significant change by addition of clay particles up to 7%, even when the some moisture is exist, but if the amount of clay particles increases over 10%, the addition of moisture remarkably affects the bond strength. The proper amount of moisture has a close relationship with the fineness of clay particles and the amount of its effective range varies to the higher according to the finer clay particles. The maximum bond strength are obtained by adding the moisture up to 3% for 10% clay particles and the moisture 5% for 20% respectively. Finally, the addition of clay (2∼10μ) in moulding sand are recognized to improve permeability and bond strength. On the contrary the addition of silt (10∼50μ) does not influence any bonding power not withstanding it decreases permeability. These facts shows that the bonding power is not affected by the quantity of colloidal substance in the clay particles, but the main factor is depend upon the size and distribution of final clay particles.
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