Effect of hydrothermal synthesis process on preparation and micromorphology of xonotlite fibers

doi:10.3969/j.issn.1001-1935.2025.03.002

Abstract

Abstract: To achieve high aspect ratios,xonotlite fibers were synthesized via the dynamic hydrothermal method using hydrated silica as the silicon source and Ca(OH)₂ as the calcium source.The effects of the insulating temperature (160,180,200,220 and 240 ℃),the stirring speed (50,100,150,200 and 300 r·min^-1),and the insulating time (2,6,12,24 and 36 h) on the phase composition and micromorphology of hydrothermal products were investigated through XRD and SEM.The results show that:with the increasing insulating temperature,the xonotlite content and fiber length increase;with the stirring speed increasing,the xonotlite content maintains constant,but the fiber length initially increases and then decreases;with the insulating time prolonging,the xonotlite content increases,while the fiber length significantly extends.Under the conditions of insulating at 220 ℃ for 24 h at the stirring speed of 100 r·min^-1,xonotlite fibers with a length of 14.7 μm and an aspect ratio of 47 can be obtained.

Key words: xonotlite fibers, hydrothermal synthesis, insulating temperature, stirring speed, insulating time

摘要： 为制备高长径比的硬硅钙石纤维,以白炭黑为硅源,Ca(OH)₂为钙源,采用动态水热法合成硬硅钙石。借助XRD、SEM考察保温温度(160、180、200、220、240 ℃)、搅拌转速(50、100、150、200、300 r·min^-1)、保温时间(2、6、12、24、36 h)对水热合成产物的物相组成及显微形貌的影响。结果表明:随着保温温度的升高,硬硅钙石含量增加,纤维长度增加;提高搅拌转速,硬硅钙石含量不变,纤维长度先增加后减小;延长保温时间,硬硅钙石含量增加,纤维长度显著增加。在220 ℃保温24 h、搅拌转速为100 r·min^-1的条件下,可获得长度14.7 μm、长径比47的硬硅钙石纤维。

关键词: 硬硅钙石纤维, 水热合成, 保温温度, 搅拌转速, 保温时间

CLC Number:

TQ175

Wang Dejing, Wang Wenwu, Ye Guotian, Cao Xiying, Wang Ziqiang, Zhou Yudong. Effect of hydrothermal synthesis process on preparation and micromorphology of xonotlite fibers[J]. Refractories, 2025, 59(3): 192-197.

王得憬, 王文武, 叶国田, 曹喜营, 王自强, 周玉栋. 水热合成工艺对硬硅钙石纤维制备及显微形貌的影响[J]. 耐火材料, 2025, 59(3): 192-197.

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