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碳包纳米氧化锆粉体的制备及其晶型转变

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Abstract:

采用溶剂共混法将氢氧化锆沉淀与液态酚醛树脂混合,制备成树脂–氢氧化锆复合体系,在埋碳气氛经500~1000℃热处理、研磨,得到碳–氧化锆纳米复合粉体。用热重–差示扫描量热仪、X射线衍射仪、场发射扫描电子显微镜及高分辨透射电子显微镜对样品进行了表征。结果表明;在复合粉体中,一部分碳进入氧化锆晶格中使高温四方相氧化锆在室温稳定存在;另一部分游离于氧化锆周围的碳起空间位阻作用,有效地抑制了复合粉中氧化锆颗粒在烧结过程中的晶粒长大;在空气中700℃氧化除去复合粉中的碳后,氧化锆的粒径仅为20~50nm,但由氢氧化锆分解形成的氧化锆容易成团聚状态,一次粒径可达50~100nm。

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