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Method for preparing SiC ceramic-based composite material from spongy silicon carbide nanofiber preform
The invention discloses a method for preparing a SiC ceramic-based composite material from a spongy silicon carbide nanofiber preform. The method comprises: filling a glass tube with a spongy SiCnf material, and pre-compressing the spongy SiCnf material by external force to obtain a pre-compressed body; soaking the pre-compressed body in a low-concentration phenolic resin solution, taking out the pre-compressed body after soaking, drying the pre-compressed body to be half-dry, putting the pre-compressed body into a mold, carrying out pressing, drying, cracking, and repeating for multiple times; carrying out vacuum impregnation with a PCS solution, taking out the product, carrying out drying and cracking, and repeating for multiple times; after completely cooling, carrying out vacuum impregnation with a high-concentration phenolic resin solution, carrying out drying and cracking, and repeating for multiple times; and placing the above in a crucible, uniformly covering the surface with Si powder, and then firing. According to the invention, the characteristics of high strength, wear resistance, corrosion resistance and the like of SiC ceramic are retained, and the composite material also has the advantages of low density, high toughness and stable high-temperature performance, so that preparation of the SiCnf/SiC composite material with high volume fraction, high compact network structure, low porosity and low residual silicon is realized, and the composite material has excellent mechanical properties of a SiCnf reinforcement.
本发明公开了一种海绵状碳化硅纳米纤维预制体制备SiC陶瓷基复合材料的方法。将海绵状SiCnf材料装入玻璃管内用外力预压缩获得预压缩体；浸渍于低浓度酚醛树脂溶液中，浸透后取出烘至半干后放入模具进行压制，再烘干后裂解且多次重复；以PCS溶液真空浸渍，取出烘干再裂解且多次重复；完全冷却后以高浓度酚醛树脂溶液真空浸渍，烘干再裂解且多次重复；置于坩埚内，用Si粉均匀覆盖于表面再烧制。本发明在保留SiC陶瓷高强度、耐磨、耐腐蚀等特性的同时，还具备了密度低、韧性好、高温性能稳定的优点，实现了高体积分数、高致密网络结构及低孔隙率低残余硅SiCnf/SiC复合材料的制备，具有SiCnf增强体优异的力学性能。
Method for preparing SiC ceramic-based composite material from spongy silicon carbide nanofiber preform
The invention discloses a method for preparing a SiC ceramic-based composite material from a spongy silicon carbide nanofiber preform. The method comprises: filling a glass tube with a spongy SiCnf material, and pre-compressing the spongy SiCnf material by external force to obtain a pre-compressed body; soaking the pre-compressed body in a low-concentration phenolic resin solution, taking out the pre-compressed body after soaking, drying the pre-compressed body to be half-dry, putting the pre-compressed body into a mold, carrying out pressing, drying, cracking, and repeating for multiple times; carrying out vacuum impregnation with a PCS solution, taking out the product, carrying out drying and cracking, and repeating for multiple times; after completely cooling, carrying out vacuum impregnation with a high-concentration phenolic resin solution, carrying out drying and cracking, and repeating for multiple times; and placing the above in a crucible, uniformly covering the surface with Si powder, and then firing. According to the invention, the characteristics of high strength, wear resistance, corrosion resistance and the like of SiC ceramic are retained, and the composite material also has the advantages of low density, high toughness and stable high-temperature performance, so that preparation of the SiCnf/SiC composite material with high volume fraction, high compact network structure, low porosity and low residual silicon is realized, and the composite material has excellent mechanical properties of a SiCnf reinforcement.
本发明公开了一种海绵状碳化硅纳米纤维预制体制备SiC陶瓷基复合材料的方法。将海绵状SiCnf材料装入玻璃管内用外力预压缩获得预压缩体；浸渍于低浓度酚醛树脂溶液中，浸透后取出烘至半干后放入模具进行压制，再烘干后裂解且多次重复；以PCS溶液真空浸渍，取出烘干再裂解且多次重复；完全冷却后以高浓度酚醛树脂溶液真空浸渍，烘干再裂解且多次重复；置于坩埚内，用Si粉均匀覆盖于表面再烧制。本发明在保留SiC陶瓷高强度、耐磨、耐腐蚀等特性的同时，还具备了密度低、韧性好、高温性能稳定的优点，实现了高体积分数、高致密网络结构及低孔隙率低残余硅SiCnf/SiC复合材料的制备，具有SiCnf增强体优异的力学性能。
Method for preparing SiC ceramic-based composite material from spongy silicon carbide nanofiber preform
一种海绵状碳化硅纳米纤维预制体制备SiC陶瓷基复合材料的方法
CHEN JIANJUN (author) / LOU YONGWEI (author) / HOU HONGCHEN (author) / CHENG WEIQIANG (author) / ZHENG XUPENG (author)
2021-10-22
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
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