Fiber spraying processes have been established for polymer matrix composites for decades. In this study, we transferred an automated fiber spraying process to short fiber bundle-reinforced Nextel 610/ Al₂O₃-ZrO₂ oxide fiber composites (SF-OFC). The effect of the processing factors travel height, spray angle, and movement speed on the specimen strength was analyzed in a full factorial experimental design. As a result, the significance of the travel height as well as the interaction between travel height and movement speed was demonstrated. Furthermore, the influence of the fiber length (14, 28, 56, and 112 mm) on the bending stress and strain was investigated. Independent of the used fiber length, the SF-OFC exhibited an excellent quasi-ductile fracture behavior with bending strains in the range of .6% and in-plane isotropic material properties. The average bending strength increased from 133 ± 27 MPa with 14 mm fiber reinforcements to 163 ± 29 MPa with 112 mm fibers. The achieved bending strengths clearly exceeded the off-axis properties of currently used fabric-reinforced OFC. These properties, combined with the excellent drapability and cost effectiveness, make the novel material highly promising for industrial applications such as flame tubes, burner nozzles, kiln furnitures, or foundry components.

中文翻译：

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全氧化物陶瓷基复合材料的短纤维喷涂工艺：参数研究

几十年来，已经为聚合物基复合材料建立了纤维喷涂工艺。在这项研究中，我们将自动纤维喷涂工艺转移到短纤维束增强的 Nextel 610/ Al ₂ O ₃ -ZrO ₂氧化物纤维复合材料 (SF-OFC)。在全因子实验设计中分析了加工因素行程高度、喷射角度和运动速度对试样强度的影响。结果，证明了行程高度的重要性以及行程高度和运动速度之间的相互作用。此外，研究了纤维长度（14、28、56 和 112 mm）对弯曲应力和应变的影响。与使用的纤维长度无关，SF-OFC 表现出优异的准延展性断裂行为，弯曲应变在 0.6% 范围内，并且具有面内各向同性材料特性。平均弯曲强度从 14 毫米纤维增强的 133 ± 27 MPa 增加到 112 毫米纤维的 163 ± 29 MPa。所达到的弯曲强度明显超过目前使用的织物增强 OFC 的离轴性能。这些特性与出色的悬垂性和成本效益相结合，使这种新型材料在火焰管、燃烧器喷嘴、窑具或铸造部件等工业应用中极具前景。