石墨-水泥基复合材料的制备与性能

PREPARATION AND PROPERTIES OF GRAPHITE-CEMENT BASED COMPOSITES

为提高水泥基材料的抗电磁干扰性能,制备了石墨–水泥基复合材料,测试了材料的电阻率、电磁屏蔽效能和力学性能。结果表明:对石墨–水泥基复合材料,在一定范围内,随掺入的石墨质量分数(下同)的增加,材料电阻率呈下降趋势。石墨掺入量为5%～10%时复合材料电阻率下降非常明显,超过15%以后,电阻率变化已不太明显;随着石墨掺量的增加,复合材料的电磁屏蔽效能也逐渐增大,石墨掺入量为15%时达到最大值,而抗折强度及抗压强度则随着石墨掺入量的增加有所下降。

In order to improve the characteristic of electromagnetic interference resistance of cement based material, the graphitecement based composites were prepared. The resistivity, electromagnetic shielding effectiveness and mechanical performance of the composites were measured. The results indicate that the resistivity tends to decreasing with increasing the mass fraction （the same below） of graphite to a certain value, The decrease of resistivity is obvious when graphite is added in the range of 5% to 10%, and when the graphite content exceeds 15%, the change of resistivity is slight. The electromagnetic shielding effectiveness of the composites increases with increasing graphite content and reaches the maximum when the graphite content is 15%. However, the flexural strength and compressive strength decrease with increasing graphite content.