La2O3-TiC/W复合材料的制备与力学性能研究

Study on preparation and mechanical properties of La_2O_3-TiC/W composite

采用粉末冶金法制备La2O3和TiC协同增强钨基复合材料,研究La2O3-TiC/W复合材料的室温力学性能。结果表明:与纯钨相比,La2O3和TiC显著提高材料的硬度、弹性模量、抗弯强度和断裂韧性;La2O3-TiC/W复合材料抗弯强度在TiC的质量分数为5%时出现最大值898MPa,断裂韧性在TiC的质量分数为10%时出现最大值10.07MPa.m1/2。质量分数为1%的La2O3与质量分数为5%的TiC协同作用时,La2O3-TiC/W复合材料具有较好的综合力学性能。

The tungsten-based composites,co-strengthened by 1wt%La2O3 and TiC were prepared by powder metallurgy method.The mechanical properties at room temperature and strengthening and toughening mechanisms of La2O3-TiC/W were investigated.The results show that co-addition of La2O3 and TiC improves hardness,elastic modulus,flexural strength and fracture toughness compared with pure tungsten.The flexural strength of La2O3-TiC/W has a maximum of 898MPa with 5wt%TiC,and fracture toughness has a maximum of 10.07MPa·m^1/2 with 10wt%TiC.The La2O3-TiC/W composite has optimal mechanical properties with addition of 1wt%La2O3 and 5wt%TiC.