ＣａＯ‐Ａｌ２Ｏ３系化合物の２００°Ｃ，１０ＭＰａリン酸溶液中における反応生成物

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  • Reaction Products of the Compounds of the System CaO-Al<sub>2</sub>O<sub>3</sub> in Phosphoric Acid Solutions at 200°C under 10MPa
  • CaO Al2O3ケイ カゴウブツ ノ 200ドC 10MPa リンサン ヨウ

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Reaction or hydration of the compounds of the system CaO-Al2O3 in phosphoric acid soiutions was studied by hydrothermal techniques at 200°C under the pressure of 10MPa. The products of the system treated for 1day, 10days and 30days were C3AH6, AH (Boehmite), Ca10(PO4)6(OH)2: HAp, CaHPO4 and 3 types of AlPO4, Berlinite (Ber.), Tridymite form (Tri.) and Cristobalite form (Cri.). The products in low phosphoric acid solntions were C3AH6, AH and HAp. In the region where the reaction occurred instead of hydration, CaHPO4 or Tri. tended to form instead of AH on HAp. The formation region of C3AH6 appeared to extend between the lines from CaHPO4 and HAp to Al2O3 in the system CaO-Al2O3-H3PO4 (H2O).<br>In the comparison of the results of 100°C under 10MPa with those of 200°C under 10MPa hydrothermal treatment, the produced phases of aluminum phosphate seemed to have a correspondence such as Lucin-type variscite→Cri., Messbach-type variscite→Tri. and Metavariscite→Ber..<br>CaHPO4 and Ber. formed together in high phosphoric acid region above the line of H3PO4/CaO+Al2O3+H3PO4≅50mol%.

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  • 窯業協會誌

    窯業協會誌 90 (1038), 56-63, 1982

    公益社団法人 日本セラミックス協会

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