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 sewn composite material. The preparation method comprises the following steps: 1) sewing a preform: (1) cutting two-dimensional plain silicon carbide fiber cloth into a square shape; (2) spraying a layer of adhesive sticker on the surface of the cut silicon carbide fiber cloth, and laminating and paving to form a paving layer; (3) the laying layer is clamped, sewing is conducted according to the sewing density: the stitch length * the line spacing = 5 mm * 4 mm, a sewing line is a silicon carbide fiber sewing line, and the angle formed between the connecting line between the needle heads and the needle tails of every two adjacent lines and the sewing line in the horizontal direction is basically a right angle; (4) shaping; 2) preparing a pyrolytic carbon interface layer through chemical vapor deposition; 3) preparing a silicon carbide interface layer through chemical vapor deposition; 4) dipping; (5) high-pressure curing; 6) high-temperature cracking; and 7) repeating the steps 4)-6) until the weight change of the prefabricated body is less than a set value or a target value. The interlaminar shear strength of the seamed composite material prepared by the invention is improved by 60%.
本发明公开了一种缝合复合材料的制备方法，包括以下步骤：1)缝合预制体:①将二维平纹碳化硅纤维布裁剪为方形；②将裁剪好的碳化硅纤维布表面喷涂一层不干胶，叠层平铺成铺层；③将铺层夹持，以缝合密度：针距×行距＝5mm×4mm缝合，缝合线为碳化硅纤维缝合线，相邻两行的针头与针尾之间的连线与水平方向的缝合线之间形成的角度基本为直角；④定型；2)化学气相沉积制备热解碳界面层；3)化学气相沉积制备碳化硅界面层；4)浸渍；5)高压固化；6)高温裂解；7)反复进行4)～6)步，直至预制体的重量变化小于设定值或目标值。本发明制成的缝合复合材料的层间剪切强度提高了60％。
The invention discloses a preparation method of a sewn composite material. The preparation method comprises the following steps: 1) sewing a preform: (1) cutting two-dimensional plain silicon carbide fiber cloth into a square shape; (2) spraying a layer of adhesive sticker on the surface of the cut silicon carbide fiber cloth, and laminating and paving to form a paving layer; (3) the laying layer is clamped, sewing is conducted according to the sewing density: the stitch length * the line spacing = 5 mm * 4 mm, a sewing line is a silicon carbide fiber sewing line, and the angle formed between the connecting line between the needle heads and the needle tails of every two adjacent lines and the sewing line in the horizontal direction is basically a right angle; (4) shaping; 2) preparing a pyrolytic carbon interface layer through chemical vapor deposition; 3) preparing a silicon carbide interface layer through chemical vapor deposition; 4) dipping; (5) high-pressure curing; 6) high-temperature cracking; and 7) repeating the steps 4)-6) until the weight change of the prefabricated body is less than a set value or a target value. The interlaminar shear strength of the seamed composite material prepared by the invention is improved by 60%.
本发明公开了一种缝合复合材料的制备方法，包括以下步骤：1)缝合预制体:①将二维平纹碳化硅纤维布裁剪为方形；②将裁剪好的碳化硅纤维布表面喷涂一层不干胶，叠层平铺成铺层；③将铺层夹持，以缝合密度：针距×行距＝5mm×4mm缝合，缝合线为碳化硅纤维缝合线，相邻两行的针头与针尾之间的连线与水平方向的缝合线之间形成的角度基本为直角；④定型；2)化学气相沉积制备热解碳界面层；3)化学气相沉积制备碳化硅界面层；4)浸渍；5)高压固化；6)高温裂解；7)反复进行4)～6)步，直至预制体的重量变化小于设定值或目标值。本发明制成的缝合复合材料的层间剪切强度提高了60％。
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