topochemical

It is shown that expansible ettringite forms in the topochemical reaction,and crystallizes in-situ on the surface of unhydrated aluminate minerals and orients radially.

发现能够产膨胀的钙矾石是由局部反应所成；它们在的铝酸盐矿物表面原地结晶，呈放射状长。

The expansion mechanism of hydroxide expanding phase for oil well cement slurry are discussed on the basis of principle of chemical thermodynamics and topochemical reaction model.

要基于膨胀剂原地反应模型和原理，讨论了晶体长压的源动及泥浆体体积膨胀与结晶压的关系。