Consolidation mechanism

The consolidation mechanism of many of these ceramic composites involves a thin glassy phase linking the matrix grains, the reinforcement and the crystalline portion of the sintering additive.14 The thermal and mechanical properties of all these phases are quite different, which will therefore influence the behaviour of the composite. Although the coefficient of thermal expansion... 

Khossravi, D., and Morehead, W.T. (1997), Consolidation mechanisms of pharmaceutical solids A multi-compression cycle approach, Pharm. Res., 14,1039-1045. 

The compression cycle profiles may be used to characterize the consolidation mechanisms of powders as they help to characterize the extent of pressure distribution within the powder bed as well as the formed tablet. The compression behavior... 

The final tablet properties are also affected by the consolidation (i.e., bonding) mechanisms of the powder which is influenced by its chemical nature, the surface area of the contact points, contamination (including film coatings such as magnesium stearate), and interparticle distance. The predominant consolidation mechanisms are listed below ... 

Fig. 10 shows a typical Heckel diagram. Deviations from linearity often occur at low and high pressures. These are to be expected. At low pressures, reduction in porosity is largely by particle rearrangement, and thus the true consolidation mechanism, i.e., fragmentation or deformation, will be a minor component of the total consolidation process. At high pressures, porosity can become very low and hence its reciprocal becomes a very large number. 

Starch is a very widely used tablet excipient, but in its natural state, it does not possess the fluidity and binding characteristics needed as a tablet diluent. The major consolidation mechanism of starch is by deformation with a high elastic component.In addition, starch shows a high degree of lubricant sensitivity. 

Armstrong NA, Cham T-M. Changes in the particle size and size distribution during compaction of two pharmaceutical powders with dissimilar consolidation mechanisms. Drug Dev Ind Pharm 1986 12 2043-2059. 

Fig. 27. Outline of Si3N4 consolidation mechanisms. After Natanson and Sarin [85]. Reproduced with permission of the Deutche Keramische Gesellschaft E. V., Koln.

The consolidation mechanism of SPC compositions containing these additives can be considered as resulting from two processes decompression of silicon acid gel due to a decrease in the surface tension of intermicellar liquid and polymerization under the influence of acid solutions. 

Figure 2. Conceptual consolidation mechanisms for fractured crystalline rock masses involving (a) horizontal joints, (b) vertical Joints, (c) vertical faults, and (d) intact rock After Zangerl (2003).

A further study was conducted to study the effect of compression temperature on the consolidation mechanism of the polymorphs of chlorpropamide [51]. The effect of environmental temperature on the compression mechanism of the A and C forms of chlorpropamide was investigated with an eccentric type tableting machine with two load cells and a noncontact displacement transducer. The temperature of the sample powders was controlled at 0 and 45°C, and these were compressed at almost 230 MPa. The tableting dynamics were evaluated by Cooper and modified Heckel analyses. The results suggest that particle... 

Breakage mechanisms will be treated in the following section. Here, we focus particularly on growth and consolidation mechanisms. 

Connor M (1995) Consolidation mechanisms and interfacial phenomena in thermoplastic powder impregnated composites. EPFL Thesis No 1413... 

Zhu Deqing, et al, Sintering behaviours of chromite fines and the consolidation mechanism Int. J. Miner. ProceM,86(2008),58-67. 

The consolidation mechanism of manganese ore sinters is different from that of iron ore sinters. In this part, the microstmcture of finished sinters (at natural basicity) was analyzed hy optical microscope together with SEM-EDS. The results are presented in Figure 8 and Figure 9. 

But Instead, experimental compounds of Interest in memory learning research have all derived fraa well-verbalized, but necessarily poorly founded, theories. Often the investigator sought to use a drug primarily to buttress a theory. And foremost among current theories are those concerned with consolidation" mechanisms for the "memory trace". A wealth... 

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