緻密な塊状蝋石とその粉砕物との熱的性質の比較 : 蝋石の研究, 1

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The pyrochemical properties of the naturally compact pyrophyllite from Shôkô-Mountain were investigated in detail. The comparative study on ceramic properties was also made about cut-off samples and wet ball-milled samples.The mineralogical compositions of this sample were 23% fine-grained quartz, 4% sericite, and a little kaolinite. The ground sample lost the combined water between 400° and 800°C, and the compact sample between 500° and 900°C without breakdown of the crystal lattice, but the specific surface area, which was determined by BET method, gave the maximum value with 700°C fired sample. The specific gravity decreased from 500° to 800°C rapidly. The apparent porosity and the water absorption of the fired compact sample increased from 600° to 900°C, and then decreased slowly; but with the ball-milled sample these properties decreased from 900°C and rapidly from 1100°C. The fired volume change was also different, the compact sample indicated permanent expansion from 600° to 1400°C, but the ground sample contracted from 1000°C. The bending strength of the compact sample decreased rapidly from 1300°C, but the ground sample increased from 1200°C rapidly. Samples which were fired between 900° and 1300°C gave very low thermal expansion, but samples fired above 1350°C gave marked cristobalite effect. The moisture expansion of the compact sample which was fired above 1100°C showed almost negligible value, but under the 1100°C fired sample showed some degrees of moisture expansion. On the contrary, ground sample showed marked moisture expansion above 1100°C.
社団法人日本セラミックス協会の論文
1965-09-01

緻密な塊状蝋石とその粉砕物との熱的性質の比較 : 蝋石の研究, 1

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