Al粉添加量对汽车用热压注成形Al2O3粉末组织和性能的影响  

Effects of Al powders addition on microstructure and properties of automobile Al2O3 powders prepared by hot-pressing molding

作　　者：戴红霞[1] 冯晓丽 DAI Hong-xia;FENG Xiao-li(Intelligent Manufacturing Institute,Yangzhou Polytechnic Institute,Yangzhou 225127,China;College of Electrical,Energy and Power Engineering,Yangzhou University,Yangzhou 225009,China)

机构地区：[1]扬州工业职业技术学院智能制造学院,扬州225127 [2]扬州大学电气与能源动力工程学院,扬州225009

出　　处：《粉末冶金技术》2020年第3期234-238,共5页Powder Metallurgy Technology

摘　　要：选择Al粉作为Al2O3粉末材料的改性剂,采用热压注工艺制备汽车用Al2O3粉末材料试样,研究不同Al粉添加量(质量分数)对Al2O3粉末材料组织结构和力学性能的影响。结果表明:Al2O3粉末热压注试样最大收缩率出现在长度方向,最小收缩率出现于高度方向。随着Al粉质量分数的增加,Al2O3粉末热压注试样收缩率表现出先减小,后稳定增加,最后再减小的变化规律,弯曲强度和体积密度降低,气孔率显著升高,试样挠度增高,浇注得到更大孔径的结构,同时试样中大尺寸孔径数量也显著增多。随着Al粉质量分数的增加,试样中Al2O3衍射峰不断上升,玻璃相的变化不大。加入质量分数8%的Al粉后,试样断口区域生成了明显的颗粒结构,说明试样主要发生沿晶断裂。The automobile Al2O3 powder samples were prepared by hot-pressing molding,using Al powders as the modifying agents,the effects of Al powder content by mass on the microstructure and mechanical properties of Al2O3 powder samples were studied.The results show that,the maximum shrinkage rate appears in the length direction of Al2O3 powder samples and the minimum one appears in the height direction.With the increase of Al powders content by mass,the shrinkage rate of Al2O3 powder samples decreases first and then increases steadily,and finally decreases.With the increase of Al powders content by mass,the bending strength and volume density of Al2O3 powder samples decrease,while the porosity increase significantly.In addition,the Al2O3 powder samples show a larger deflection,the structure with larger pore diameter can be obtained by hot-pressing molding,and the number of larger pore in Al2O3 powder samples also increases significantly.With the increase of Al powders content by mass,the diffraction peak of Al2O3 increases continuously,but the glass phase changes finitely.When the mass fraction of Al powders is 8%,the obvious grain structure is formed in the fracture area of Al2O3 powder samples and the intergranular fracture is mainly occurred.

关 键 词：Al2O3粉末 Al粉 热压注 收缩率 力学性能 

分 类 号：TQ174[化学工程—陶瓷工业]