Tricalcium phosphates materials

Destainville A., Champion E., Bernache-Assollante D., et al. (2003). Synthesis, characterization and thermal behaviour of apatite tricalcium phosphate // Materials Chemistry and Physics, No. 80, pp. 269 - 277 Dorozhkin S.V. (2009). Calcium Orthophosphates in Nature, Biology and Medicine. Materials, 2 pp. 399-498... 

Other Ceramic Calcium Phosphate Materials. Other ceramic calcium phosphate materials for repairing bony defect iaclude p-tricalcium phosphate (P-TCP) [7758-87-4], P-Ca2(PO, and biphasic calcium phosphate (BCP) ceramics which consist of both P-TCP and HA. Unlike ceramic HA, P-TCP resorbs ia the tissue (293). The in vivo dissolution of BCP ceramic implants was shown (296) to iacrease with increasing P-TCP/HA ratio ia the implants. Both P-TCP and BCP can lead to new bone growth to various extents depending on the appHcations and the type of materials used (293,296). 

The kinetic equation can vary with a number of factors. For the reaction between tricalcium phosphate and urea, relatively coarse material (-180-1-200 mesh) obeyed the law x = kt with E = 18 kcaP g mol (32,400 Btu/lb mol) and finer material (—300f320 mesh) obeyed a first-order equation with E = 28 kcaPg mol. 

By far the largest source of phosphorus is phosphate rock, with some use of phosphatic iron ore, from which phosphorus is obtained as a by-product from the slag. Phosphate rock consists of the insoluble tricalcium phosphate and other materials. For use as a fertilizer, phosphate must be converted to the water soluble form, phosphoric acid (H3PO4) which has three hydrogen atoms, all of which are replaceable by a metal. Tricalcium phosphate, is converted to soluble monocalcium phosphate and to superphosphate, A fertilizer factory, typically, a large installation, characterized by large silos produces year round, but peaks with the demands of the growing season. Phosphorus has many uses other than for fertilizer. 

Kutty and Murthy [1159] have made a kinetic study of the solid—solid reaction between tricalcium phosphate and urea nitrate, a process of possible technological importance. A reduction in particle size, notably of Ca3(P04)2, increased the rate of reaction in powder mixtures and also changed the kinetic characteristics (318—338 K). Reaction in relatively coarse material (between —180 and +200 mesh) obeyed the parabolic... 

Biomedical materials include ceramics such as the biologically active hydroxylapatite and tricalcium phosphate, and high-strength metals such as titanium alloys.These materials are not produced by CVD as this time, except on an experimental basis. CVD, however, is the major process used in the production of another very important biomedical material, i.e., isotropic... 

Brunner TJ, Grass RN, Bohner M, Stark WJ (2007) Effect of particle size, crystal phase and crystallinity on the reactivity of tricalcium phosphate cements for bone reconstruction. Journal of Materials Chemistry 17 4072 1078. 

Calcium phosphate, also called tricalcium phosphate (TCP), serves as a model for a whole group of calcium phosphates which end with hydroxyapatite (HA). Another name for these materials, which resemble the mineral part of the bone chemically seen, is resorbable ceramics. 

Liao J., Ono K., Kanayama G., Isobe T., Senna M. Preparation of tricalcium phosphate by applying grinding technique and choosing hydroxycontaining initial materials. 

Spray-Dried Products. Spray drying is used to convert solutions, emulsions, or suspensions into powders. The applications in pharmaceutical technology are numerous. Raw materials are spray dried, for instance, to enhance the compressional properties of substances such as lactose and tricalcium phosphate, to distribute a minor component like digoxin more uniformly in a matrix, and to enhance their dissolution rate as described for digoxin in combination with a hydrophilic polymer. ... 

Tercent density based on the true density of the starting materials. P-Tricalcium phosphate. 

Tricalcium phosphate has the largest range of uses of the three forms of the compound, the most important of which are in the manufacture of fertilizers, the production of ceramic materials, and the preparation of other compounds of phosphorus. The compound is also used ... 

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