碱盐对镁铝尖晶石砖的侵蚀主要表现为以气相或液相形式渗透到耐火材料内部气孔中并在冷端沉积，使砖体致密化。
The infiltration and deposition of alkali salts in the form of vapor or liquid will gradually result in a complete filling of the apparent pore and brick densification.
用矿化剂NH_4F调节粉体的形状，使粉体中薄水铝石针状晶的数目降低并形成对调节载体孔结构有利的片状粉体；
Mineralization agent NH4F was used to regulate shape of the powder so as to lower the amount of bohemite needle crystals and form flake-shape powder;
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