轻质碳化硼复合材料的制备工艺及性能研究

The Research on Preparation Process and Properties of Light-weight Boron Carbide Composite Materials

本研究以B4C、Si C、Ti C、C等为原料,经过喷雾干燥工艺造粒,采用无压烧结制备了轻质碳化硼复合材料。探讨了浆料中不同料水比对碳化硼造粒料的影响,测试了碳化硼烧结体的相关性能,并借助SEM对烧结体进行断口形貌观察。实验结果表明:当料水比为1:1.5时,料浆经过喷雾干燥工艺制粒,可制得颗粒表面形貌近似为圆形的碳化硼混合造粒料,所压素坯经过无压烧结,制得了结构致密,组织均匀,力学性能优良的轻质碳化硼复合材料。其体积密度为2.53 g/cm3、相对密度为97.76%、维氏硬度为25.5GPa、抗弯强度为437 MPa、断裂韧性为5.24 MPa·m-1/2。

In this research used boron carbide, silicon carbide, titanium carbide and carbon black as raw materials, granulated through spray drying technology and light-weight boron carbide composite materials were prepared by the pressureless sintering. Discussed the influence of different ratio between material and water of the slurry on boron carbide granulation materials, tested the performance of the boron carbide sintered body, oberseved the fracture morphology of sintered body with the help of SEM. The results show that when the ratio between materi- al and water is 1：1.5, can be obtained boron carbide mixture with the circle appearance is approximate spherical, prepared with dense structure and uniform organization, excellent mechanical properties of light-weight boron carbide composite material by pressureless sintering process. The volume density is 2.53 g/cm^3, relative density is 97.76 %, the viekers hardness is 25.5 GPa, the bending strength is 437 MPa, the fracture toughness is 5.24 MPa-m^-1/2.