Calcium borate synthesis by solid-state reaction

Calcium borate has been employed for various purposes, including fire resistance enhancement, lubrication, and coating applications. This research aimed to analyze calcium borate synthesis through a solid-state reaction, which includes various parameters such as composition, temperature, and time. To achieve this, a selected composition was subjected to thermal analysis by DTA/TG, and the decomposition behavior of CaCO3 and H3BO3 was determined. Additionally, the solid-state reaction temperature was defined as 900 °C. Six compositions were designed based on the CaO-B2O3 binary phase diagram, using calcium carbonate and boric acid as starting materials. The synthesis of calcium borate was carried out at 900 °C for 3 h. X-ray diffraction (XRD) analysis performed to determine phase analysis of solid stated calcium borate composition and detected Ca2B2O5, Ca2B2O4, CaB4O7. Scanning electron microscopy (SEM) were then used to investigate the morphological properties of the produced powder. An increase in the amount of boron content, solid-state morphology transforms cluster-enlarged particles, depending on the existence of CaB4O7. Stretching of the bonds was investigated using FTIR, and therefore, three different calcium borate phases, which are Ca2B2O5, Ca2B2O4, and CaB4O7, were found. Therefore, different calcium borate forms were produced via solid state reaction, and the increase in boron amount encouraged the formation of CaB4O7.