激光烧结原位合成钨精原矿粉/Al-Cu复合材料组织结构及致密性  

Densification and Microstructure of Tungsten Ore/Al-Cu Composites synthesized in Situ by Laser Sintering

作　　者：水东莉[1] 李刚 SHUI Dongli;LI Gang(School of Agricultural Equipment Engineering,Liaoning Agricultural Vocational and Technical College,Yingkou 115009,China;Yingkou College of Technology,Yingkou 115014,China)

机构地区：[1]辽宁农业职业技术学院农业装备工程学院,辽宁营口115009 [2]营口理工学院,辽宁营口115014

出　　处：《有色金属工程》2022年第7期26-32,共7页Nonferrous Metals Engineering

基　　金：辽宁省教育厅科技研究项目资助(LJKZ1195);营口理工学院创新团队支持计划资助(TD202001);营口理工学院高层次人才科研启动项目资助(YJRC202014)。

摘　　要：利用激光束高能量为燃烧热源,引发体系Al热反应与钨精原矿粉中WO_(3)进行置换,原位自生增强相,制备钨精原矿粉/Al-Cu复合材料。利用OM、SEM、XRD、TEM等研究了激光工艺参数、成分配比和压制压力对复合材料微观结构和致密性的影响规律。结果表明:复合材料由α-Al,α-(Al,W)和中间相构成的多相结构为基体,纳米晶颗粒Al_(2)O_(3)为增强相的复杂复合组织构成;随着功率的增加及作用时间的延长,烧结产物组织均匀细化程度明显提高。当激光功率为1000 W,持续作用时间为30 s时,试样组织晶粒最均匀细小;激光的工艺参数、原始压坯相对密度和成分配比影响烧结产物的致密性。当工艺参数激光功率为1000 W,持续作用时间为30 s,压坯相对密度为85%,Al/Cu的成分配比为66.8∶33.2时,产物的孔隙率最低为3.67%,合成密度最大为3.58 g/cm^(3),致密化程度最高。The high temperature energy of the laser beam was used as the combustion heat source to initiate the Al thermal reaction of the system and replace the WO_(3) in tungsten concentrate powder,and the in situ self-strengthening phase was used to prepare tungsten carbide powder/Al-Cu composite material.The effects of laser processing parameters,component ratio and pressing pressure on the microstructure and compactness of the composites were characterized by OM,SEM,XRD and TEM.The results show that composite materials consist of complex composite structures.The matrix is a multiphase structure composed ofα-Al,α-(Al,W)and intermetallics.The reinforcing phase is composed of nanocrystalline Al_(2)O_(3).With the increase of power and action time,the microstructure uniformity and refinement degree of sintered products increased significantly.When the laser power is 1000 W and the duration is 30 s,the microstructure and grains of the sample are the most uniform and fine.The process parameters of laser,the relative density of the original compact and the composition ratio affect the compactness of the sintered products.When the technological parameters are 1000 W,30 s,the relative density of the billet is 85%,and the component ratio of Al/Cu is 66.8∶33.2,the porosity of the product is 3.67%,the maximum density of synthesis is 3.58 g/cm^(3),the degree of densification is the highest.

关 键 词：烧结 钨精原矿粉 微观结构 组织 致密性 

分 类 号：TG139[一般工业技术—材料科学与工程]