Product name: Hydroxyapatite;hydroxylapatite

Abbreviation: HAP

Physical and chemical properties: Melting point: 1650 ° C, specific gravity: 3.16 g / cm, solubility: 0.4 ppm, Ca / P: 1.67

Crystal structure: hexagonal system (space group No. 176), monoclinic system (space group No. 14)

Product specifications: powder, porous particles, block (non-calibrated) products

CAS No.: 1306-06-5

Molecular weight: 502.31

Molecular formula: Ca5HO13P3

Molecular weight: 1004

Hydroxyapatite is a pure endmember of the apatite containing hydroxide. The crystal of hydroxyapatite is hexagonal, with a specific gravity of 3.08 and a Mohs hardness of 5. Pure hydroxyapatite powder is white, but natural hydroxyapatite is interspersed with brown, yellow or green. It can also be synthesized manually and applied to bone tissue repair. Hydroxyapatite has another crystal structure: monoclinic.

Hydroxyapatite is the main inorganic constituent of human bone tissue. After implantation in the body, calcium and phosphorus will liberate the surface of the material to be absorbed by body tissues and grow new tissue. Studies have shown that the finer the crystallites of hydroxyapatite, the higher the biological activity. The main component of the enamel on the tooth surface is also hydroxyapatite [1].

Hydroxyapatite can be obtained by means of its own production. There are many methods for producing hydroxyapatite powder. The more common methods include precipitation method, hydrolysis method, hydrothermal method and solid phase method. Among them, the hydrothermal method is more complicated and expensive. Compared with the hydrothermal method, the precipitation method is simple in operation, cheap in equipment, and large in productivity. Most of the methods are currently based on this method. However, the precipitation method has some disadvantages, such as the fact that the powder is easily aggregated, the quality is unstable, and the like.