Multilayer fiber coating comprising alternate fugitive carbon and
ceramic coating material for toughened ceramic composite materials
    6.
    发明授权
    Multilayer fiber coating comprising alternate fugitive carbon and ceramic coating material for toughened ceramic composite materials 失效
    多层纤维涂层,包括用于增韧陶瓷复合材料的交替的短暂碳和陶瓷涂层材料

    公开(公告)号:US5455106A

    公开(公告)日:1995-10-03

    申请号:US132524

    申请日:1993-10-06

    Abstract: A fiber-reinforced ceramic-matrix composite material exhibiting high tensile strength, high fracture toughness and high-temperature oxidation resistance is produced by alternatively depositing multiple thin layers of ceramic material separated by very thin intermediate layers of fugitive carbon onto the fiber reinforcement prior to the subsequent densification with the ceramic matrix. The energy behind propagating matrix cracks in the resulting composite material are effectively dissipated by the progressive increase in crack deflection/branching and frictional slip through the successive ceramic layers of the multilayer fiber coating system. These energy release and arrest mechanisms sufficiently impede the driving force behind unstable crack propagation and render the cracks non-critical, thereby serving to blunt and/or divert propagating matrix cracks at or around the reinforcing fiber. While significantly increasing the strength and fracture toughness of the composite, the multilayer refractory fiber coating system enables the composite to remain oxidatively stable when stressed at or beyond the matrix cracking stress point and subsequently exposed to temperatures above 800.degree. C. in air.

    Abstract translation: 通过交替地将由非常薄的中间层的缓冲性碳分离的多个陶瓷材料薄层交替地沉积到纤维增强材料之前,形成具有高拉伸强度,高断裂韧性和高温抗氧化性的纤维增强陶瓷基复合材料 随后用陶瓷基体致密化。 通过多层纤维涂层系统的连续陶瓷层的裂纹偏转/分支和摩擦滑移的逐渐增加,所得复合材料中传播的基体裂纹的能量被有效地消散。 这些能量释放和阻止机制充分阻碍了不稳定裂纹扩展后的驱动力,使裂纹非关键,从而在增强纤维或其附近钝化和/或转移传播的基质裂纹。 同时显着提高复合材料的强度和断裂韧性,多层耐火纤维涂层系统能够使复合材料在基体裂纹应力点或以上受应力时保持氧化稳定性,随后在空气中暴露于高于800℃的温度。

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