Expansivity vs. temperature

Dilatometric methods. This can be a sensitive method and relies on the different phases taking part in the phase transformation having different coefficients of thermal expansion. The expansion/contraction of a sample is then measured by a dilatometer. Cahn et al. (1987) used dilatometry to examine the order-disorder transformation in a number of alloys in the Ni-Al-Fe system. Figure 4.9 shows an expansion vs temperature plot for a (Ni79.9Al2o.i)o.s7Feo.i3 alloy where a transition from an ordered LI2 compound (7 ) to a two-phase mixture of 7 and a Ni-rich f c.c. Al phase (7) occurs. The method was then used to determine the 7 /(7 + 7O phase boundary as a function of Fe content, at a constant Ni/Al ratio, and the results are shown in Fig. 4.10. The technique has been used on numerous other occasions,... 

Figure 4.9. Expansion vs temperature plot for a (Ni79.9Al2o.i)o.87Feo,ij alloy showing y / y + 7-phase boundary at 1159°C from Cahn el al. (1987).

Figure 22.14. Coefficient of expansion vs temperature for well tempered chocolate cooled at different rates (Pinschower 2003).

The curves of thermal expansion vs. temperature of both metal and glass should, in the case of matched seals, follow one another closely over the same specified range of temperature. 

Fig. 1. Thermal expansion vs. temperature for copper. Inconel 718, and a boron-epoxy composite.

Figure 2.34 Coefficient of thermal expansion vs. temperature for SABIC Innovative Plastics Cycoiac ABS resins.

Figure 2.66 Linear thermal expansion vs. temperature for two BASF Polystyrene resins [6].

Figure 4.71 Thermal expansion vs. temperature for Evonik Vestodur PBT plastics according to ISO 11359 [5], Note pretreatment 20 h at 120°C, heating rate 2 K/min.

Figure 6.63 Thermal expansion vs. temperature for several Evonik Industries Vestamid Nylon 12 resins [4],...

Figure 6.187 Coefficient of thermal expansion vs. temperature according to ISO 11359 for Evonik Industries Vestamid DX9300—low viscosity, heat stabilized, with improved release properties Nylon 612 resin [9].

Figure 7.23 Coefficient of iinear thermal expansion vs. temperature for Ticona GUR 4120—high bulk density, corrosion stabilized ultra high molecular weight PE resin [1],...

Figure 10.82 Coefficient of linear thermal expansion vs. temperature for Sumitomo Chemical Sumika Excel PES resins.

Record the secant value of the expansion vs. temperature over the temperature range of 23°C to 55°C. Select a temperature range from a smooth portion of the thermal curves in the desired temperature range, then obtain the change in length over that temperature range. 

As the purity of material increases (and/or increase in alumina content), the value increases. The thermal coefficient of expansion of a given material is the slope of the linear thermal expansion vs. temperature. The differential magnitudes of thermal expansion between two materials are considered key design parameters and should be kept to a minimum. Increases with wt% of aluminum oxide, with 96% alumina being considered as standard. 

Beta-CEZ Thermal coefficient of linear expansion vs temperature... 

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