The use of fibers as additives to increase the strength of investment casting shell has yielded some significant results. Here, polypropylene fiber of length 6 mm was added to the shell by airflow placement fiber method, and the three different processes [the conventional method, preimmersion silica sol method, and preimmersion slurry method (PSM)] were used to prepare fiber-reinforced shell based on better fiber dispersion; the strength of shell with 0.2–1.0 wt% fiber addition was tested and compared. The experimental results show that the green strength and fired strength of shell with 0.4–0.6 wt% fiber addition reached the maximum in the three processes. The shell prepared by PSM exhibited a higher strength than the other two methods with the same amount of fiber addition; the maximum green strength was 36.9% higher than the strength of fiber-free shell. Combined with the surface morphology of placement fiber and fracture surface morphology of shell, the factors affecting shell strength and interface bonding characteristics were analyzed.

使用纤维作为添加剂来增加熔模铸造壳体的强度已产生了一些显着的结果。在此，通过气流放置纤维法将长度为6 mm的聚丙烯纤维添加到壳中，并使用三种不同的方法[常规方法，预浸硅溶胶法和预浸浆法（PSM）]来制备纤维增强的壳基于更好的纤维分散性；测试并比较了添加0.2–1.0 wt％纤维的壳的强度。实验结果表明，添加了0.4–0.6 wt％纤维的壳的生坯强度和耐火强度在三个过程中达到最大值。在纤维添加量相同的情况下，PSM制备的壳比其他两种方法显示出更高的强度。最大生坯强度为36。比无纤维外壳的强度高9％。结合铺放纤维的表面形态和壳体的断裂表面形态，分析了影响壳体强度和界面粘结特性的因素。