Cementing mechanism of potassium phosphate based magnesium phosphate cement
Cementing mechanism of potassium phosphate based magnesium phosphate cement
复制标题
磷酸钾基磷酸镁水泥的胶结机理
DOI：
10.1016/j.ceramint.2012.04.083
复制
发表时间：
2012-12-01
影响因子：
5.2
通讯作者：
Li, Zongjin
中科院分区：
文献类型：
--
作者：
Ding, Zhu;Dong, Biqin;Li, Zongjin
磷酸镁水泥（MPC）是属于化学结合陶瓷材料的材料。由于其上级的性能，具有广泛的应用前景。本文研究了以重烧氧化镁和磷酸二氢钾（M-PP）为原料制备的磷酸镁水泥的反应产物和胶凝机理。分别用细粉和颗粒重烧氧化镁制备了纯水泥浆体和粘结块体试样。研究了两种不同试样中水泥反应产物及其微观形貌。利用SEM、TEM、XDR和光学显微镜对试样的微观结构进行了分析。鸟粪石钾（MgKPO 4。在反应产物中观察到6 H（2）O）。结果表明，鸟粪石以晶态和非晶态两种形态存在。硬化水泥浆体中还存在残余氧化镁。通过显微镜观察，可以看出，反应产物在未反应的氧化镁周围形成，并且可以发展成连续结构，这进一步产生硬化的浆料。如果在水化过程中有足够大的空间，鸟粪石可以在长期养护中生长形成更完整的晶体。(C)2012 Elsevier Ltd和Techna Group S.r.l. All rights reserved.
Magnesium phosphate cements (MPCs) are materials that belong to chemically bonded ceramic materials. They have a wide range of potential applications, due to their superior performance. In this paper, the reaction products and cementing mechanism of magnesium phosphate bonded cement based on the dead burned magnesia and the mono-potassium phosphate (M PP) are investigated. Fine powder and grains of dead burned magnesia were used to prepare pure cement paste and bonding cluster samples, respectively. The cement reaction products and their micro-morphology in the both different samples are examined. The microstructure of specimens is analyzed by SEM, TEM, XDR, and optical microscopy. Struvite of potassium (MgKPO4 . 6H(2)O) is observed in the reaction products. According to the analysis, it is found that struvite exists in both crystalline and amorphous form. There is also residual magnesia in the hardened cement paste. By means of microscopy observation, it can be seen that reaction products form around the unreacted magnesia and can develop into a continuum structure, which further produces the hardened paste. Struvite can grow up to form the more perfect crystal in a long term curing age, if large enough space is available during the hydration process. (C) 2012 Elsevier Ltd and Techna Group S.r.l. All rights reserved.