Conversion of gibbsite to boehmite as a precursor for many aluminum oxide materials was widely concerned. Herein, the steam-assisted crystallization (SAC) method was conducted to synthesis the boehmite from gibbsite. The transformation behavior of gibbsite to boehmite treated at 155, 165, 175, and 185 °C by SAC method was studied by XRD and SEM analysis. The treated temperature and time were the main factor determining the transformation of morphologies and crystal phase of gibbsite to boehmite. Boehmite was appeared at 165 °C and 12 h for the SAC method but at 175 °C and 12 h for the hydrothermal method. Lower temperature and less time were required for conversion of gibbsite to boehmite by SAC compared to hydrothermal method. The advantageous transformation of gibbsite to boehmite is ascribed to the steam activation. Thus, a novel and effective SAC method was presented to synthesis of boehmite from gibbsite.

将三水铝石转变成勃姆石作为许多氧化铝材料的前驱体已受到广泛关注。在本文中，进行了蒸汽辅助结晶（SAC）法以从菱镁矿合成勃姆石。通过XRD和SEM分析，研究了SAC法分别在155、165、175和185℃下处理三水铝石向勃姆石的转化行为。处理的温度和时间是决定菱镁矿向勃姆石形态和相转变的主要因素。SAC方法在165°C和12 h出现勃姆石，而SAC方法在175°C和12 h出现勃姆石。水热法。与水热法相比，通过SAC将菱镁矿转化为勃姆石所需的温度更低，时间更少。菱铁矿向勃姆石的有利转变归因于蒸汽活化。因此，提出了一种新的有效的SAC方法，用于从菱镁矿合成勃姆石。