Y_(2)O_(3)添加方式对WC-10%Co硬质合金性能的影响

Effect of Adding Methods of Y_(2)O_(3) on Properties of WC-10%Co Cemented Carbides

现代金属切削技术的发展对效率与成本提出了更高的要求,硬质合金刀具材料需要更长的使用寿命、更高的稳定性来满足需求。本文采用低压烧结法制备了WC-Co类硬质合金,研究了Y_(2)O_(3)及其添加方式对硬质合金显微结构、物理力学性能和切削性能的影响。结果表明:Y_(2)O_(3)通过形成弥散相可以使硬质合金在维持现有优异的宏观物理性能的基础上,显著提升耐磨性及切削寿命。同时,通过使用Y(NO3)3作为前驱体受热分解为Y_(2)O_(3)的方式进行弥散强化还会伴随着固溶强化效应,使得材料的切削性能得到进一步提升。在达到0.3 mm的失效磨损量时,未添加Y_(2)O_(3)的样品失效时间为14 min,直接添加Y_(2)O_(3)的样品失效时间为16 min,,添加Y(NO3)3作为前驱体的样品失效时间为28 min。

The development of modern metal cutting technology puts forward higher requirements for efficiency and costs,and cutting tool materials of cemented carbides require longer service life and higher stability to meet the demand.In this paper,WC-Co cemented carbides were prepared by low-pressure sintering,and the effects of Y_(2)O_(3) and the adding methods of Y_(2)O_(3) on the microstructure,physical and mechanical properties,and cutting performance of cemented carbides were studied.The results reveal that by the formation of dispersed phases of Y_(2)O_(3),the wear resistance and cutting life of cemented carbides can be significantly improved while the excellent macroscopic physical properties of cemented carbides are maintained.Meanwhile,Y(NO3)3,used as the precursor,is decomposed by heat into Y_(2)O_(3) to strengthen dispersion,which is also accompanied by solid solution strengthening and further improves the cutting performance of the material.When the failure wear is 0.3 mm,the failure time of the sample without Y_(2)O_(3) is 14 min;the failure time of samples directly added with Y_(2)O_(3) is 16 min,and the failure time of the sample with Y(NO3)3 as the precursor is 28 min.