CeO_2、La_2O_3、Y_2O_3和V_2O_5对Co-Cu-Sn-Fe超硬工具胎体力学性能的影响

Influence of CeO_2,La_2O_3,Y_2O_3 and V_2O_5 on the performances of Co-Cu-Sn-Fe matrix of superhard material tools

选用Co55Cu29Sn10Fe6作为基础配方,以稀土氧化物(CeO2、La2O3、Y2O3)和V2O5作为添加物,研究它们对Co-Cu-Sn-Fe体系的胎体性能影响。研究发现,稀土氧化物对胎体的硬度改善不大,甚至会使硬度大幅降低,但是对胎体的抗折强度影响显著。CeO2含量在0.5%～0.8%、La2O3含量在0.6%、Y2O3含量在0.2%～0.5%时,抗折强度均较未加稀土氧化物的基础配方(451.9MPa)提高很多。V2O5对胎体的影响与稀土氧化物明显不同。V2O5含量低于1.0%时,胎体的抗折强度会有一定提高,在456.4～551.4MPa之间。

This paper is focused on the effects of the types and amount of rare earth on the properties of metal bond composites. The basic formula of experiment is Co55Cu29Sn10Fe6, and makes CeO2, La2 03, Y2 03, V2 O5 as additives. Study found that the hardness of the metal bond composites cannot be improved by joining in rare earth oxides, even which will be substantially reduced, but the flexural strength of the metal bond can be improved significantly. When the CeO2 content is 0.5～0.8%, La203 content is 0.6%, Y2O3 content is 0.2～0.5%, the flexural strength of metal bond increases a lot compared with the basic formulation, which is free of rare earth and whose flexural strength is 451.9MPa. The roles of V205 on the metal bond composites are very different from rare earth oxides. When the V2O5 content is less than 1.0%, the flexural strength of metal bond will between 456.4MPa～ 551.4MPa.