摘要
采用无压烧结的方法制备了短切碳纤维/氧化铝（Csf/Al2O3）复合材料,研究了短切碳纤维含量变化对复合材料洛氏硬度、抗弯强度及微波介电性能的影响.结果表明：短切碳纤维在氧化铝基体中分散均匀,呈明显的各向异性.随着短切碳纤维含量的增加,复合材料的致密度和洛氏硬度HRA都明显降低,而试样的抗弯强度则先升高后降低.当纤维含量为0.25%时,试样抗弯强度达到最大值285 MPa,相比纯氧化铝基体提高了43.2%.在8.2～12.4 GHz频率范围的复介电常数测试结果表明,复介电常数的实部和虚部随碳纤维含量的增加先逐渐上升,当碳纤维含量从0.5%增加到0.65%时,试样的介电常数实部和虚部都显著降低,这主要是由于试样的致密度急剧下降造成的.
A series of Csf/Al2O3 composite samples were fabricated by pressureless sintering process and the effects of carbon-fiber content on the rockwell hardness, flexural strength and microwave dielectric property were analyzed. SEM photograghs showed that the carbon fibers dispersed well in the alumina matrix. With the increasing of carbon-fiber content, the density and HRA decreased obviously, while the flexural strength initially increased and then decreased. When the carbon-fiber addition exceeded 0.25%, the maximum value of flexural strength reached 285 MPa,which was 43.2% higher than that of the pure Al2O3 ceramic. Both the real part and imaginary part of the permittivity of specimens in 8.2-12.4 GHz increased as the carbon fiber content increase. The sharp reduction of the permittivity for sample with 0.65wt% carbon fiber content could be contributed to the sharp decrease of density.
出处
《硅酸盐通报》
CAS
CSCD
北大核心
2010年第4期775-778,共4页
Bulletin of the Chinese Ceramic Society
关键词
短切碳纤维
无压烧结
致密度
介电常数
short carbon fiber
pressureless sintering
relative density
permittivity
