Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
The invention discloses a preparation method of a low-porosity SiC fiber one-way prepreg tape, and aims to solve the technical problem of how to reduce the porosity of the one-way prepreg tape. According to the technical scheme, a composite coating is prepared on the surface of continuous SiC fiber, then the composite coating is unwound on a material disc to obtain an unwound wire, the unwound wire and the material disc are sealed and then placed in a high-pressure kettle, and the low-porosity SiC fiber one-way prepreg tape is obtained. The preparation method comprises the following steps: introducing ceramic slurry, applying pressure and maintaining the pressure to obtain slurry-soaked fibers, winding the slurry-soaked fibers on a winding roller, drying to obtain a low-porosity SiC fiber unidirectional prepreg tape with uniformly distributed slurry, carrying out lamination molding, and carrying out autoclave curing, high-temperature carbonization and vacuum melting siliconizing in sequence to obtain the MI-SiC/SiC ceramic-based composite material. According to the preparation method, air in fibers and bubbles in slurry are removed through a process of vacuumizing and pressurizing in the slurry dipping stage of the SiC bundle filaments with the surface coatings, so that the slurry fully permeates into the fiber bundles, and the density of the SiC fiber one-way prepreg tape and the slurry distribution uniformity can be remarkably improved.
本发明公开了一种低孔隙率SiC纤维单向预浸带的制备方法，目的是解决如何降低单向预浸带的孔隙率的技术问题，技术方案为：在连续SiC纤维表面制备复合涂层，然后退绕到料盘上获得退绕丝，将退绕丝连同料盘密封后，置于高压釜中，导入陶瓷浆料，施加压力并保压，获得浸浆的纤维，然后缠绕到卷绕辊上，干燥后获得浆料分布均匀、低孔隙率的SiC纤维单向预浸带，层叠成型，先后经过热压罐固化、高温碳化和真空熔融渗硅后，获得MI‑SiC/SiC陶瓷基复合材料。本发明通过在带表面涂层的SiC束丝浸渍浆料阶段先抽真空再加压的工艺，除去纤维中的空气以及浆料中的气泡，使浆料充分渗入纤维束内，可以显著提高SiC纤维单向预浸带的致密度和浆料分布均匀性。
The invention discloses a preparation method of a low-porosity SiC fiber one-way prepreg tape, and aims to solve the technical problem of how to reduce the porosity of the one-way prepreg tape. According to the technical scheme, a composite coating is prepared on the surface of continuous SiC fiber, then the composite coating is unwound on a material disc to obtain an unwound wire, the unwound wire and the material disc are sealed and then placed in a high-pressure kettle, and the low-porosity SiC fiber one-way prepreg tape is obtained. The preparation method comprises the following steps: introducing ceramic slurry, applying pressure and maintaining the pressure to obtain slurry-soaked fibers, winding the slurry-soaked fibers on a winding roller, drying to obtain a low-porosity SiC fiber unidirectional prepreg tape with uniformly distributed slurry, carrying out lamination molding, and carrying out autoclave curing, high-temperature carbonization and vacuum melting siliconizing in sequence to obtain the MI-SiC/SiC ceramic-based composite material. According to the preparation method, air in fibers and bubbles in slurry are removed through a process of vacuumizing and pressurizing in the slurry dipping stage of the SiC bundle filaments with the surface coatings, so that the slurry fully permeates into the fiber bundles, and the density of the SiC fiber one-way prepreg tape and the slurry distribution uniformity can be remarkably improved.
本发明公开了一种低孔隙率SiC纤维单向预浸带的制备方法，目的是解决如何降低单向预浸带的孔隙率的技术问题，技术方案为：在连续SiC纤维表面制备复合涂层，然后退绕到料盘上获得退绕丝，将退绕丝连同料盘密封后，置于高压釜中，导入陶瓷浆料，施加压力并保压，获得浸浆的纤维，然后缠绕到卷绕辊上，干燥后获得浆料分布均匀、低孔隙率的SiC纤维单向预浸带，层叠成型，先后经过热压罐固化、高温碳化和真空熔融渗硅后，获得MI‑SiC/SiC陶瓷基复合材料。本发明通过在带表面涂层的SiC束丝浸渍浆料阶段先抽真空再加压的工艺，除去纤维中的空气以及浆料中的气泡，使浆料充分渗入纤维束内，可以显著提高SiC纤维单向预浸带的致密度和浆料分布均匀性。
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