Thermal characterization of Hollow glass powder
Regarding the thermal information obtained from DSC analysis, Table 3 shows a single melting peak, Tm, around 185℃ belonging to the three materials' γ-crystal phase of polyamide. Similarly, the crystallization peak, Tc, coincided at ∼140℃for all materials. The sintering window, defined as the difference between endothermic and exothermic peak temperatures, ranged around 40℃ for the two composites, asseverating the suitability of PH1 and PH-2 for the SLS process. Tm and Tc values are increased when HGM content rises, especially at 30% of HGM addition. The crystalline degree was smaller in the composite than in the neat PA2200 because the hard particles induce heterogeneous nucleation and more imperfections, acting as a detriment of crystallinity. The particle size distributions of three kinds of polyamide composites obtained by sieve analysis are shown in Table 2. The data indicated that many small particles are irregularly distributed around the large particles of polyamide powder. The powders of PH-1 and PH-2 are nearly spherical and have good flow performance by adding the hollow spherical glass microsphere. That is good for spreading power. The particle size distributions of PH-1 and PH-2 are 12~180μm and mainly concentrated in the range of 20~90μm (accounting for more than 90%). D10, D50, and D90 refer to the corresponding particle size that the cumulative distribution percentage reaches 10%, 50%, and 90%, respectively. D[4,3] is the average volume diameter and surface area average diameter. It can be seen that the median diameters of the three powders are 58.7μm, 50.1μm and 47.6μm, the average volume diameters are 62.6μm, 53.9μm and 48.2μm, and the values are relatively close. Therefore, three materials have particle sizes in the preferred range for SLS processing. If you are looking for high quality, high purity, and cost-effective Hollow glass powder, or if you require the latest price of Hollow glass powder, please feel free to email contact mis-asia.