(佳木斯大學(xué) 材料科學(xué)與工程學(xué)院，佳木斯 154007)
摘 要: 采用陶瓷先驅(qū)體轉(zhuǎn)化法連接Cf/SiC復(fù)合材料。針對Cf/SiC復(fù)合材料的不同連接界面特性，采用不同的連接配方和工藝。結(jié)果表明：對于第一類以SiC相為主的連接界面，采用單一的聚硅氮烷即可實現(xiàn)Cf/SiC復(fù)合材料的連接，當連接溫度為1 300 ℃，經(jīng)兩次浸漬/裂解增強處理的連接件接頭抗剪強度達最大值29.6 MPa；連接層厚度為2~3 μm，其結(jié)構(gòu)較為均勻致密，由無定型SiNC陶瓷組成；對于第二類以C纖維端面為主的連接界面，采用聚硅氮烷并加入活性填料納米Al粉來實現(xiàn)其連接；當連接溫度為1 150 ℃，經(jīng)兩次浸漬/裂解增強處理的連接件抗剪強度達最大值22.5 MPa；連接層厚度約為30 μm，連接層中含有SiC、Si3N4和AlN等相。
關(guān)鍵字: Cf/SiC復(fù)合材料；聚硅氮烷；連接；界面特性
（School of Materials Science and Engineering, Jiamusi University, Jiamusi, 154007, China）
Abstract:Joining of carbon fiber reinforced SiC composite(Cf/SiC) to itself was realized via preceramic silicone polysilazane(PSZ) with aluminium nanopowders as joining materials. The different joining technology was used for the different joining interfaces of Cf/SiC. The results show that Cf/SiC was joined by using single polysilazane for the first kind of joining interface mainly containing SiC. The maximum shearing strength of the joints is 29.6 MPa. This value is obtained at the joining temperature of 1 300 ℃ and after the reinforcement for 2 times. The joining material transforms into an amorphous SiCN ceramic interlayer with thickness of 2−3 μm. Cf/SiC can be joined by using polysilazane with aluminium nanopowders as joining material for the second kind of joining interface mainly containing C fiber. The maximum shearing strength of the joints is 22.5 MPa. This value is obtained at the joining temperature of 1 150 ℃ and after reinforcement for 2 times. The thickness of joining interface is about 30 μm, and the joining interface includes SiC, Si3N4, AlN and Al4C3 crystallites.
Key words: Cf/SiC composites; polysilazane; joining; interface property
