研究了原材料磷酸二氢铵(P)与氧化镁(M)的质量比值对磷酸镁水泥抗压强度和凝结时间的影响,通过XRD、扫描电镜和能谱检测分析了该比值影响的作用机理。研究发现,材料体系是由大量未反应的氧化镁颗粒被水化产物胶结而形成的强度体系,氧化镁对水化反应速率和强度发展至关重要;水化产物主要为磷酸铵镁和磷酸镁类化合物,其组成及晶体形貌结构受m(P)/m(M)比值影响较大,当m(P)/m(M)比值在1/4~1/5时,水化产物晶体微观形貌结构密实,材料强度较高。 The effects of mass ratio of ammonium dihydrogen phosphate (P) to magnesium oxide (M) on the compressive strength and setting time of magnesium phosphate cement were studied. The mechanism of the effect of this ratio was analyzed by XRD, SEM and EDS. The study found that the material system is composed of a large number of unreacted magnesia particles hydration products cementing the formation of the strength of the system, magnesium oxide hydration reaction rate and strength development is crucial; hydration products are mainly ammonium phosphate and magnesium phosphate The composition and crystal structure of the compounds are greatly affected by the ratio of m (P) / m (M). When the ratio of m (P) / m (M) is 1/4 to 1/5, Micro-structure is compact, high material strength.