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تکنولوژی پودر پیشرفته
جزئیات رویداد
همایش ، رویداد ، ژورنال
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  • effect of low temperature on formation mechanism of calcium phosphate nano powder via precipitation method

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    • تاریخ ارائه: 1393/01/01
    • تاریخ انتشار در تی پی بین: 1393/01/01
    • تعداد بازدید: 574
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     calcium phosphate powders were synthesized with ca/p molar ratios of initial reagents ranging from 1.660 to 1.667 using wet precipitation method. this work deals with allocating a specific temperature level to each h3po4 solution and ca(oh)2 suspension prior to the mixing process, and studying their influences on powder composition. a high ph value of the synthesis medium and the incorporation of numerous carbonate ions into the structure were attained by dropping the temperature of the ca(oh)2 suspension down to 5 °c. x-ray diffractometry and ftir spectroscopy showed that heating samples that had a medium temperature exceeding 25 °c resulted in the dominant hap phase, regardless of the initial acid solution temperature. by maintaining the medium temperature at 5 °c, a sudden formation of the β-tcp phase occurred after thermal treatment at 1300 °c, and this trend continued with the concurrent decrease in the temperature of the initial acid solution. an interpretation of the formation mechanism under these low-temperature conditions is proposed in terms of the temperature and ph value of the medium and the state of the phosphate and carbonate ions.

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