The mechanical properties of the parts produced using fused filament fabrication (FFF) strongly depend on the adhesion strength between beads (F_A), which substantially depends on the temperature of the polypropylene (PP) beads during their deposition. In this work, the temperature of the beads was controlled through the adjustment of the nozzle temperature (Tn) and the manufacturing chamber temperature (Tch) in order to control respectively the PP temperature at the nozzle end and the cooling of the PP beads after their deposition. SEM observations revealed an improvement of the coalescence between overlayed beads of different layers and between adjacent beads in the same layer with the increase in Tn. The increase of Tch promotes mainly the coalescence between adjacent beads within the layer. These observations were confronted with uniaxial tensile tests based on a Mode III fracture experiment allowed quantifying the influence of Tn and Tch on the adhesion strength between overlayed beads of different layers. Results reveals a weak increase in F_A caused by the increase in the manufacturing chamber temperature from 80 °C to 100 °C, while an increase in the nozzle temperature from 170 °C to 180 °C causes a 145% F_A increase. In the same time, this decrease in the manufacturing chamber temperature causes an important increase in porosity and a substantial decrease in the adhesion strength between layers.

部件的使用熔融长丝制造（FFF）所产生的机械性能很大程度上取决于珠之间的粘合强度（F_甲），这主要取决于聚丙烯（PP）珠在沉积过程中的温度。在这项工作中，通过调节喷嘴温度（Tn）和制造室温度（Tch）来控制珠粒的温度，以便分别控制喷嘴端的PP温度和PP珠粒经过冷却后的冷却。沉积。SEM观察表明，随着Tn的增加，不同层的重叠小珠之间以及同一层中相邻小珠之间的聚结得到改善。Tch的增加主要促进层内相邻小珠之间的聚结。这些观察面临基于模式III断裂实验的单轴拉伸试验，该试验允许量化Tn和Tch对不同层的覆盖珠之间粘合强度的影响。结果显示F的微弱增加_甲造成在制造腔室温度至100℃的增加为80℃，同时增加在喷嘴温度为170℃至180℃，使A F 145％_甲增加。同时，制造室温度的这种降低导致孔隙率的显着增加和层之间的粘合强度的显着降低。