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A platform for research: civil engineering, architecture and urbanism
Low-cost needling method of carbon-based needling composite material preform
The invention discloses a low-cost needling method for a carbon-based composite material preform, which comprises the following steps: designing the carbon-based composite material preform into a margin layer and a finished product layer, and needling after covering a high-thickness carbon felt as the margin layer on the surface of the finished product layer to reduce the needling density, so that the porosity of the finished product layer is increased under the condition of ensuring the preform density; the carbon source gas smoothly passes through the interior of the finished product layer from the allowance layer of the preform in the forming process of the chemical vapor infiltration method, the composite material which is low in surface layer density, high in finished product layer density and uniform in texture is prepared, and the carbon-based composite material product which meets the dimensional precision requirement and is uniform in texture is prepared by machining the allowance layer material. According to the method, the problems of non-uniform texture of the composite material and high process cost caused by a pressure gradient method and a working allowance increasing needling preform machining method are solved with lower cost; a high-thickness net tire is used in the remaining layer of the prefabricated body, the use amount of carbon cloth is reduced, and the product preparation cost is saved.
本发明公开了碳基复合材料预制体低成本针刺方法，将碳基复合材料预制体设计为余量层和成品层，将高厚度碳毡作为余量层覆盖在成品层表面后针刺，减少针刺密度，使成品层在保证预制体密度的情况下孔隙率增大，实现化学气相渗透法成型过程中碳源气从预制体余量层向成品层内部顺利通过，制备出表层密度低，成品层密度高且质地均匀的复合材料，再通过机加工余量层材料，制备出符合尺寸精度要求、质地均匀的碳基复合材料产品。本发明以较低的成本替代了压力梯度法和增大加工余量针刺预制体机加工法导致的复合材料质地不均匀和工艺高成本的问题；预制体余量层使用高厚度的网胎，且减少碳布的用量，节约了产品制备成本。
Low-cost needling method of carbon-based needling composite material preform
The invention discloses a low-cost needling method for a carbon-based composite material preform, which comprises the following steps: designing the carbon-based composite material preform into a margin layer and a finished product layer, and needling after covering a high-thickness carbon felt as the margin layer on the surface of the finished product layer to reduce the needling density, so that the porosity of the finished product layer is increased under the condition of ensuring the preform density; the carbon source gas smoothly passes through the interior of the finished product layer from the allowance layer of the preform in the forming process of the chemical vapor infiltration method, the composite material which is low in surface layer density, high in finished product layer density and uniform in texture is prepared, and the carbon-based composite material product which meets the dimensional precision requirement and is uniform in texture is prepared by machining the allowance layer material. According to the method, the problems of non-uniform texture of the composite material and high process cost caused by a pressure gradient method and a working allowance increasing needling preform machining method are solved with lower cost; a high-thickness net tire is used in the remaining layer of the prefabricated body, the use amount of carbon cloth is reduced, and the product preparation cost is saved.
本发明公开了碳基复合材料预制体低成本针刺方法，将碳基复合材料预制体设计为余量层和成品层，将高厚度碳毡作为余量层覆盖在成品层表面后针刺，减少针刺密度，使成品层在保证预制体密度的情况下孔隙率增大，实现化学气相渗透法成型过程中碳源气从预制体余量层向成品层内部顺利通过，制备出表层密度低，成品层密度高且质地均匀的复合材料，再通过机加工余量层材料，制备出符合尺寸精度要求、质地均匀的碳基复合材料产品。本发明以较低的成本替代了压力梯度法和增大加工余量针刺预制体机加工法导致的复合材料质地不均匀和工艺高成本的问题；预制体余量层使用高厚度的网胎，且减少碳布的用量，节约了产品制备成本。
Low-cost needling method of carbon-based needling composite material preform
碳基针刺复合材料预制体的低成本针刺方法
HE XINHAI (author) / ZHOU HAO (author) / LIU FEI (author) / CHENG PAN (author) / WEI YUBO (author) / LI YANZHANG (author) / YANG PENGFEI (author) / FENG WENROU (author) / WANG CHENXING (author) / FAN JINPENG (author)
2024-05-24
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
Wet needling process for preparing carbon/carbon composite material
| European Patent Office | 2022