Curing Behavior and Structure of Magnesium Phosphate Chemically Bonded Ceramics with Different MgO to KH₂PO₄ Ratios

Abstract

Magnesium phosphate chemically bonded ceramics attracted much attention because of its good biocompatibility. In this work, curing behavior and microstructure of magnesium phosphate chemically bonded ceramics with different MgO to KH 2 PO 4 ratios were investigated. The results showed that the setting time decreased and the maximum temperature during the solidifying process increased as the increase of MgO to KH 2 PO 4 ratio. Phase compositions were different for those samples fabricated with different MgO to KH 2 PO 4 ratios. KH 2 PO 4 , MgO, and hydrated product existed in the sample with lower MgO to KH 2 PO 4 ratio because of the incomplete reaction, and numerous acicular polycrystals were found. There were only MgO and hydrated product existed with the higher MgO to KH 2 PO 4 ratio. Besides, a gelatinous structure with lots of cracks was also found. Clearly, the properties of magnesium potassium phosphate chemically bonded ceramics could be controlled by changing the MgO to KH 2 PO 4 ratio. It is better to fabricate magnesium phosphate chemically bonded ceramics with optimal structure and properties suitable for biomedical applications in range of MgO to KH 2 PO 4 ratio from 3:1 to 4:1 in this preparating conditions.

Fractal Analysis on Pore Structure and Modeling of Hydration of Magnesium Phosphate Cement Paste

“…The hydration process of MPCs is essentially an exothermic reaction of acid-base neutralization. It is believed that the hydration process of MPC can be divided into several steps: (a) MgO dissolves in water and releases Mg 2+ and OH − ; (b) Mg 2+ reacts with water molecules to form a positively charged hydrosol; (c) the hydrosol subsequently forms hydrogen phosphate with hydrogen phosphate ions; (d) the newly generated hydrogen phosphate forms a molecular network in the aqueous solution and then forms a gel [10][11][12].…”

Effects of Various Curing Conditions on Volume Stability of Magnesium Phosphate Cement

“…MPC is a new and excellent type of repair material, with the characteristics of early high strength [6], good bonding performance [7], wear resistance [8], freeze-thaw cycle stability [9], and good resistance to acid attacks [10,11]. MPC is a cementitious material formed through a chemical reaction between dead-burned MgO and phosphate (KDP) [12,13].…”

Investigation of tribological and corrosion properties in ceramic/PTFE coating

“…Nanomaterials and fibres can also be used as reinforcement to improve the corrosion resistance [9][10][11]. Besides, the curing process, which can determine the microstructure of CBC, is also investigated to improve wear and corrosion properties [3,12,13]. For example, Zhu et al [14] found the porosity of CBC decreased with the addition of ATP leading to a low corrosion current and high corrosion resistance.…”