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Preparation method of toughened BNNSs/SiC ceramic matrix composite material
The invention discloses a preparation method of a toughened BNNSs/SiC ceramic matrix composite material, which comprises the steps of S1, carrying out surface modification treatment on hexagonal boronnitride, and adding a silane coupling agent to react to obtain a boron nitride nanosheet grafted silane coupling agent product; S2, carrying out graft modification on nano silicon carbide fibers by adopting polyacrylamide chloride to obtain hydroxylated nano silicon carbide fibers grafted with the polyacrylamide chloride; S3, adding the hydroxylated nano silicon carbide fibers grafted with the polyacrylamide chloride into the boron nitride nanosheet grafted silane coupling agent product, and stirring for reaction to obtain a mixture A; and S4, dipping the mixture A into a polycarbosilane precursor solution, and carrying out curing and high-temperature sintering to form the toughened BNNSs/SiC ceramic matrix composite material. According to the preparation method, hexagonal boron nitride and the nano silicon carbide fibers are respectively modified and then grafted, so that the dispersity of hexagonal boron nitride and nano silicon carbide fibers in a matrix is improved, and the obtained BNNSs/SiC ceramic matrix composite material has excellent breaking tenacity, hardness and bending strength.
本发明公开了一种增韧BNNSs/SiC陶瓷基复合材料的制备方法，包括以下步骤：S1、对六方氮化硼进行表面改性处理，然后加入硅烷偶联剂进行反应，得到氮化硼纳米片接枝硅烷偶联剂产物；S2、采用聚丙烯酰氯对纳米碳化硅纤维进行接枝改性，得到接枝聚丙烯酰氯的羟基化纳米碳化硅纤维；S3、将接枝聚丙烯酰氯的羟基化纳米碳化硅纤维加入氮化硼纳米片接枝硅烷偶联剂产物中搅拌反应，得到混合物A；S4、将混合物A浸渍于聚碳硅烷先驱体溶液中，经固化、高温烧结，形成增韧BNNSs/SiC陶瓷基复合材料。本发明通过将六方氮化硼与纳米碳化硅纤维分别改性后，然后接枝，实现了两者在基体中分散性的同时提高，使得得到的BNNSs/SiC陶瓷基复合材料具有优异的断韧性能、硬度以及抗弯强度。
Preparation method of toughened BNNSs/SiC ceramic matrix composite material
The invention discloses a preparation method of a toughened BNNSs/SiC ceramic matrix composite material, which comprises the steps of S1, carrying out surface modification treatment on hexagonal boronnitride, and adding a silane coupling agent to react to obtain a boron nitride nanosheet grafted silane coupling agent product; S2, carrying out graft modification on nano silicon carbide fibers by adopting polyacrylamide chloride to obtain hydroxylated nano silicon carbide fibers grafted with the polyacrylamide chloride; S3, adding the hydroxylated nano silicon carbide fibers grafted with the polyacrylamide chloride into the boron nitride nanosheet grafted silane coupling agent product, and stirring for reaction to obtain a mixture A; and S4, dipping the mixture A into a polycarbosilane precursor solution, and carrying out curing and high-temperature sintering to form the toughened BNNSs/SiC ceramic matrix composite material. According to the preparation method, hexagonal boron nitride and the nano silicon carbide fibers are respectively modified and then grafted, so that the dispersity of hexagonal boron nitride and nano silicon carbide fibers in a matrix is improved, and the obtained BNNSs/SiC ceramic matrix composite material has excellent breaking tenacity, hardness and bending strength.
本发明公开了一种增韧BNNSs/SiC陶瓷基复合材料的制备方法，包括以下步骤：S1、对六方氮化硼进行表面改性处理，然后加入硅烷偶联剂进行反应，得到氮化硼纳米片接枝硅烷偶联剂产物；S2、采用聚丙烯酰氯对纳米碳化硅纤维进行接枝改性，得到接枝聚丙烯酰氯的羟基化纳米碳化硅纤维；S3、将接枝聚丙烯酰氯的羟基化纳米碳化硅纤维加入氮化硼纳米片接枝硅烷偶联剂产物中搅拌反应，得到混合物A；S4、将混合物A浸渍于聚碳硅烷先驱体溶液中，经固化、高温烧结，形成增韧BNNSs/SiC陶瓷基复合材料。本发明通过将六方氮化硼与纳米碳化硅纤维分别改性后，然后接枝，实现了两者在基体中分散性的同时提高，使得得到的BNNSs/SiC陶瓷基复合材料具有优异的断韧性能、硬度以及抗弯强度。
Preparation method of toughened BNNSs/SiC ceramic matrix composite material
一种增韧BNNSs/SiC陶瓷基复合材料的制备方法
HOU GUANGYU (author)
2021-02-26
Patent
Electronic Resource
Chinese
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