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Preparation method of toughened boron nitride nanosheet silicon nitride ceramic composite material
The invention discloses a preparation method of a toughened boron nitride nanosheet silicon nitride ceramic composite material, which comprises the following steps: S1, carrying out surface functionalization treatment on hexagonal boron nitride to obtain functionalized boron nitride nanosheets, and reacting the functionalized boron nitride nanosheets with aminophenyl diazonium salt to obtain modified boron nitride nanosheets; S2, carrying out graft modification on nano silicon nitride fiber by adopting polyacrylamide chloride to obtain the nano silicon nitride fiber grafted with the polyacrylamide chloride; S3, enabling the nano silicon nitride fiber grafted with the polyacrylamide chloride to react with the modified boron nitride nanosheets to obtain a mixture A; and S4, dipping the mixture A into a polysilazane precursor, and carrying out curing and high-temperature sintering to obtain the boron nitride nanosheet/silicon nitride ceramic composite material. According to the preparation method, hexagonal boron nitride and nano silicon nitride fibers are respectively modified and then grafted, so that the dispersity of the hexagonal boron nitride and the nano silicon nitride fibersin a matrix is improved, and the obtained boron nitride nanosheet/silicon nitride ceramic composite material has excellent breaking tenacity and bending strength.
本发明公开了一种增韧氮化硼纳米片氮化硅陶瓷复合材料的制备方法，包括以下步骤：S1、对六方氮化硼表面功能化处理，得到功能化氮化硼纳米片，然后与氨基苯基重氮盐反应，得到改性氮化硼纳米片；S2、采用聚丙烯酰氯对纳米氮化硅纤维接枝改性，得到接枝聚丙烯酰氯的纳米氮化硅纤维；S3、将接枝聚丙烯酰氯的纳米氮化硅纤维与改性氮化硼纳米片反应，得到混合物A；S4、将混合物A浸渍于聚硅氮烷先驱体中，经固化、高温烧结，得到氮化硼纳米片/氮化硅陶瓷复合材料。本发明通过将六方氮化硼与纳米氮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，使得得到的氮化硼纳米片/氮化硅陶瓷复合材料具有优异的断韧性能和抗弯强度。
Preparation method of toughened boron nitride nanosheet silicon nitride ceramic composite material
The invention discloses a preparation method of a toughened boron nitride nanosheet silicon nitride ceramic composite material, which comprises the following steps: S1, carrying out surface functionalization treatment on hexagonal boron nitride to obtain functionalized boron nitride nanosheets, and reacting the functionalized boron nitride nanosheets with aminophenyl diazonium salt to obtain modified boron nitride nanosheets; S2, carrying out graft modification on nano silicon nitride fiber by adopting polyacrylamide chloride to obtain the nano silicon nitride fiber grafted with the polyacrylamide chloride; S3, enabling the nano silicon nitride fiber grafted with the polyacrylamide chloride to react with the modified boron nitride nanosheets to obtain a mixture A; and S4, dipping the mixture A into a polysilazane precursor, and carrying out curing and high-temperature sintering to obtain the boron nitride nanosheet/silicon nitride ceramic composite material. According to the preparation method, hexagonal boron nitride and nano silicon nitride fibers are respectively modified and then grafted, so that the dispersity of the hexagonal boron nitride and the nano silicon nitride fibersin a matrix is improved, and the obtained boron nitride nanosheet/silicon nitride ceramic composite material has excellent breaking tenacity and bending strength.
本发明公开了一种增韧氮化硼纳米片氮化硅陶瓷复合材料的制备方法，包括以下步骤：S1、对六方氮化硼表面功能化处理，得到功能化氮化硼纳米片，然后与氨基苯基重氮盐反应，得到改性氮化硼纳米片；S2、采用聚丙烯酰氯对纳米氮化硅纤维接枝改性，得到接枝聚丙烯酰氯的纳米氮化硅纤维；S3、将接枝聚丙烯酰氯的纳米氮化硅纤维与改性氮化硼纳米片反应，得到混合物A；S4、将混合物A浸渍于聚硅氮烷先驱体中，经固化、高温烧结，得到氮化硼纳米片/氮化硅陶瓷复合材料。本发明通过将六方氮化硼与纳米氮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，使得得到的氮化硼纳米片/氮化硅陶瓷复合材料具有优异的断韧性能和抗弯强度。
Preparation method of toughened boron nitride nanosheet silicon nitride ceramic composite material
一种增韧氮化硼纳米片氮化硅陶瓷复合材料的制备方法
DUAN SHENZHEN (author)
2021-03-02
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
/
D06M
Behandeln von Fasern, Fäden, Garnen, Textilgut, Federn oder aus solchen Materialien hergestelltem Fasergut, soweit nicht anderweitig in Klasse D06 vorgesehen
,
TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
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