Agglomeration of magnesium oxide particles formed by the decomposition of magnesium hydroxide
Agglomeration of magnesium oxide particles formed by the decomposition of magnesium hydroxide
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氢氧化镁分解形成的氧化镁颗粒团聚
DOI：
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发表时间：
1988
期刊：
影响因子：
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通讯作者：
M. Kinoshita
中科院分区：
文献类型：
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作者：
K. Itatani;Kiyotaka Koizumi;F. Howell;A. Kishioka;M. Kinoshita
采用氢氧化镁（Mg（OH）2）分解法研究了氧化镁（MgO）颗粒的团聚。附聚物的性质根据分解温度区域而变化：（i）低于650° C，（ii）650° C至850° C，（iii）850° C至1050° C，和（iv）1050° C至1200°C。在区域（i）中，原始Mg（OH）2骨架或假晶保留在粉末中并显示出团聚。含有假晶的团聚体的强度约为50 MPa;假晶中的初级颗粒通过MgO和残余水的相互作用而化学键合。在区域（ii）的赝象开始显示出一些碎片：这些赝象的结合强度迅速降低。在区域（iii）中，微晶和初级颗粒都通过烧结生长;这种生长可能是由于基于假晶崩塌的接触面积增加。通过烧结生长的颈部的初级颗粒可以容易地通过研磨被拉开。在区域（iv）中，由于初级颗粒的重排导致的孔生长导致MgO的致密化速率和晶体生长的抑制。
Agglomeration of magnesium oxide (MgO) particles was studied by decomposing magnesium hydroxide (Mg(OH)2). The properties of agglomerates varied according to the decomposition temperature region: (i) below 650° C, (ii) 650° C to 850° C, (iii) 850° C to 1050° C, and (iv) 1050° C to 1200°C. In region (i), the original Mg(OH)2 frameworks or pseudomorphs remained in the powder and showed agglomeration. The strength of agglomerates containing the pesudomorphs was about 50 MPa; the primary particles in pseudomorphs are bonded chemically by the interaction of MgO and residual water. In region (ii) the pseudomorphs began to show some fragmentation: the bonding strength of these pseudomorphs reduced rapidly. In region (iii), both crystallite and primary particles were grown by the sintering; this growth may be due to an increase in contact area based on the collapse of pseudomorphs. The primary particles whose necks were grown by the sintering could be easily pulled apart by grinding. In region (iv) pore growth due to the rearrangement of primary particles caused the suppression of both densification rate and crystal growth of MgO.