摘要
以有机硅先驱体聚碳硅烷为粘结剂，采用热压烧结工艺，制得了C_f／SiC陶瓷基复合材料，并对其三点弯曲强度进行了测试和分析。结果表明：该工艺方法可方便的制得强度较高的陶瓷基复合材料单向板;其三点弯曲强度与试样的高跨比有很大关系，高跨比越大，弯曲强度越小;当高跨比为0.073时，材料弯曲强度为475.1MPa，断裂功为4.47kJ／m^2;材料的应力-应变曲线与普通陶瓷不同，表现塑性变形的非线性弹性特征。
The continuous carbon fiber - reinforced silicon carbide ceramic matrix composites were fabricated by hot pressing sintering method using polycarbonsilane as binder. The strength of the materials was investigated by three-point bending test. It is shown that the bending strength depends greatly on the H/L ratio where H is the height of specimen and L is the span, and it becomes lower When the H/L is increased. When the H/L ratio is 0. 073, the bending strength of the material is 475. 1 MPa, and its fracture works is 4. 47 kJ/m^2. It is shown some non-line-elastic failure characters of plastic materials from its load-defection curves.
出处
《宇航材料工艺》
CAS
CSCD
北大核心
1998年第6期35-37,共3页
Aerospace Materials & Technology
关键词
热压烧结法
CF/SIC
陶瓷基
复合材料
弯曲强度
Hot pressing sintering method, C_f/SiC ceramic matrix composites, Three-point bending strength, Stress-strain curve
