热压多孔碳化硼的力学性能及其影响因素

来源期刊：中南大学学报(自然科学版)2002年第6期

论文作者：王零森

文章页码：597 - 599

关键词：碳化硼;陶瓷;热压法;中子吸收材料

Key words：boron carbide; ceramics; hot-pressed method; neutron absorber materials

摘    要：用热压法制得了中等密度的碳化硼陶瓷,并测定了其抗弯强度、抗压强度、弹性(弯曲)模量、泊松比,得出了其抗弯强度、弹性模量与孔隙度的关系,以及抗弯强度与温度的关系.研究结果表明:所制的碳化硼陶瓷表观密度为2·1~2·3 g/cm³,晶粒粒径为12μm,室温时平均抗弯强度为247·8 MPa,抗压强度大于1 250·7 MPa,泊松比为0·16,表明材料的微观结构良好.在测量温度范围内,碳化硼的强度随温度的变化不大.

Abstract: The mechanical properties are very important and related to nearly all the uses for boron carbide. But as many brittle ceramics, these properties are extremely sensitive to microstructure. Since the materials with the same structure can′t be obtained by controlling the process of manufacture, the formulae and data about mechanical properties reported by literatures are quite different. In this paper the bending strength, the compressive strength, the elastic (bending)modulus and poisson ratio of hot-pressed porous boron carbide are measured and the relationship between bending strength and poisson ratio, elastic modulus and poisson ratio, bending strength and temperature are studied. The results show that when the density is 2.1~2.3 g/cm³and the diameter of grain size is 12μm, the average bending strength at room temperature is 247.8 MPa, the pressure strength is 1 250 MPa, the elastic modulus is 290.4 GPa, and the poisson ratio is 0.16, which states the micro-structure of material is good. In the range of measurement temperature, the boron carbide′ s value is nearly not changed.