Tricalcium phosphate technologies

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... 

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. ... 

Bone white n. Pigment made by acclimating animal bones. Composed chiefly of tricalcium phosphate. Calcium carbonate and minor constituents make up the rest. Bone white is a grayish white and slightly gritty powder. Syn bone ash. Kirk-Othmer encyclopedia of chemical technology pig-ments-powders. John Wiley and Sons, New York, 1996. 

It is likely that cordierite, titanate and zirconate ceramics will record the most rapid rates of growth, due to their uses in environmental systems, medical products, electronic components, and household appUances. A continued expansion in electronic component shipments will provide opportunities for titanate per-ovskites and other ceramics. Nonetheless, cordierite, titanates and other ceramics will undoubtedly benefit from a continued, environmentally driven trend to reduce the amounts of particulates, nitrogen oxides (NO,), and sulfur oxides that are released into the atmosphere. Technological advances in the medical product market will also provide many opportunities, notably for monohthic ceramics such as alumina and zirconia used for femoral balls in hip endoprostheses, as well as biocompatible hydroxyapatite and tricalcium phosphate coatings for the metal stems of hip implants (see also Chapter 10). Likewise, dental ceramics wiU continue to experience high growth rates through 2010. 

---