硅酸盐学报

含MgO–Gd2O3/Lu2O3烧结助剂的Si3N4陶瓷刀具的切削性能

作者：郭伟明谭大旺王宏建吴利翔林华泰

分类号：TG711

出版年,卷(期):页码：2017,45(6):836-840

DOI：

摘要：

通过热压烧结制备了以2%(质量分数)MgO–8%Lu2O3和2%MgO–8%Gd2O3为烧结助剂的2种Si3N4刀具(分别记作SN–L和SN–G)。以HT250为工件材料，对其切削性能进行了研究。结果表明：SN–G切削过程更稳定，刀具寿命更长，其有效切削长度约为2 600 m，是SN–L的2倍左右。两者后刀面磨损形貌没有明显差别，磨粒磨损和黏结磨损是主要的磨损机理。SN–G基体的晶粒较细小，增强晶粒的长径比较高，其抗弯强度和断裂韧性均比SN–L高10%左右，具有更高的晶界结合强度，在切削过程中不易发生晶粒脱落，因而刀具耐磨性更好，寿命更长。

Si3N4 cutting tools with 2%MgO–8%Lu2O3 and 2%MgO–8%Gd2O3 additives (i.e., SN–L and SN–G) were prepared via hot–pressing sintering, respectively. The cutting performance was investigated using HT250 cast iron as a work piece. The results show that SN–G has a better cutting performance with a higher stability during cutting process and a longer tool life, and the effective cutting length of SN-G is 2 600 m that is twice greater than that of SN–L. The morphology of the worn flank face of SN–L and SN–G has no significant difference, and the wear mechanisms mainly involve abrasive and adhesive wears. The size of matrix grains of SN–G is smaller, and the aspect ratio of reinforced grains is higher. The fracture strength and toughness of SN–G both are approximately 10% greater than those of SN–L. As a result, SN–G cutting tool has a higher wear resistance and a longer tool life.

基金项目：

广东省引进创新科研团队计划( 2013G061)；国家自然科学基金(51402055)资助.

作者简介：

郭伟明(1982—)，男，博士，副教授。

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