用有机硅树脂YR3370连接RBSiC陶瓷与高强石墨  

Joining of RBSiC Ceramic to High Strength Graphite with Silicon Resin YR3370

作　　者：原效坤[1] 李树杰[1] 张听[1] 

机构地区：[1]北京航空航天大学材料科学与工程学院,北京100083

出　　处：《稀有金属材料与工程》2007年第A03期44-48,共5页Rare Metal Materials and Engineering

基　　金：中国航空基础科学基金资助(03H51024);国家自然科学基金资助(50271003)

摘　　要：以一种聚硅氧烷类有机硅树脂YR3370(GE Toshiba Silicones)为连接剂,连接了反应烧结SiC(RBSiC)陶瓷和高强石墨。连接件在1100～1400℃的99.99%N_2气流中进行热处理。用X射线衍射仪和红外光谱仪分析有机硅树脂YR3370裂解产物的结构和变化,用扫描电镜观察连接件的显微结构,用材料试验机测定连接件的三点弯曲强度。连接温度为1300℃时,连接件的三点弯曲强度达最大值18.3 MPa,为石墨母材强度的45.8%。连接层是有机硅树脂YR3370裂解生成的无定形Si_xO_yC_z陶瓷,其结构连续均匀致密,厚度在2～5μm之间。连接机理是无定形Si_xO_yC_z陶瓷对RBSiC和石墨基体的无机粘接作用。Joints between reaction bonded silicon carbide （RBSiC） and high strength graphite were produced using a polysiloxane silicon resin YR3370 （GE Toshiba Silicones） as joining material. Samples were heat-treated in a 99.99% nitrogen flow at temperatures ranging from 1100 to 1400 ℃. The structure and transformation of the pyrolyzate of silicon resin YR3370 were analyzed by X-ray diffractometer and infrared spectroscopy. Microstructure of the joints was observed by scanning electron microscopy. The three-point bending strength of the joint was determined by material testing machine. The three-point bending strength of the joint reaches the maximum of 18.3 MPa, which is equal to 45.8% of the strength of the graphite substrate, at the joining temperature of 1300 ℃. The joining layer is the amorphous silicon oxycarbide ceramic pyrolyzed from silicon resin YR3370, which has a fairly continuous, homogeneous and densified structure and has a thickness of 2-5 μm. The joining mechanism is that the amorphous silicon oxycarbide ceramic acts as an inorganic adhesive to the RBSiC and the graphite substrates.

关 键 词：特种连接 有机硅树脂 SIC陶瓷 石墨 

分 类 号：TG497[金属学及工艺—焊接]