TiAl合金熔炼用La_(2)O_(3)掺杂Y_(2)O_(3)陶瓷坩埚材料的制备与性能  

Preparation and Properties of La_(2)O_(3)-doped Y_(2)O_(3)Ceramic Crucible Material for TiAl Alloy Melting

作　　者：李浩然 刘岩[2] 袁明[2] 杨金晶[2] 刘学建[2] 黄政仁[2] LI Haoran;LIU Yan;YUAN Ming;YANG Jinjing;LIU Xuejian;HUANG Zhengren(School of Materials and Chemistry,University of Shanghai for Science and Technology,Shanghai 200093,China;Structural Ceramics and Composite Engineering Research Center,Shanghai Institute of Silicate,Chinese Academy of Sciences.Shanghai 201899,China)

机构地区：[1]上海理工大学材料与化学学院,上海200093 [2]中国科学院上海硅酸盐研究所结构陶瓷与复合材料工程研究中心,上海201899

出　　处：《机械工程材料》2022年第6期1-6,共6页Materials For Mechanical Engineering

摘　　要：通过固相掺杂和真空烧结技术制备了掺杂不同质量分数(0~15%)La_(2)O_(3)的Y_(2)O_(3)陶瓷,研究了陶瓷的微观结构、抗弯强度,并用该陶瓷进行TiAl合金熔炼试验,分析了界面微观结构、界面反应类型以及合金熔体的氧含量。结果表明:随着La_(2)O_(3)掺杂量的增加,La_(2)O_(3)掺杂Y_(2)O_(3)陶瓷的开气孔率先减小后增大,抗弯强度先升高后降低,当La_(2)O_(3)掺杂质量分数为10%时,陶瓷的开气孔率最小,抗弯强度最高,分别为0.45%,104 MPa;用质量分数10%La_(2)O_(3)掺杂Y_(2)O_(3)陶瓷熔炼TiAl合金后,二者界面出现了平均厚度为2.10μm的过渡层,过渡层的物相为YLaO_(3),陶瓷与合金间发生物理溶蚀反应,合金熔体的氧质量分数为2400 mg·kg^(-1),仅为未掺杂La_(2)O_(3)陶瓷的70%左右。Y_(2)O_(3)ceramics doped with different mass fraction(0-15%)of La_(2)O_(3)were prepared by solid phase doping and vacuum sintering.The microstructure and flexural strength of the ceramics were studied.The melting test of TiAl alloy was carried out with the ceramic,and the interface microstructure,interface reaction type and oxygen content of alloy melt were analyzed.The results show that with increasing La_(2)O_(3)doping content,the open porosity of La_(2)O_(3)-doped Y_(2)O_(3)ceramics decreased first and then increased,and the flexural strength increased first and then decreased.When the mass fraction of La_(2)O_(3)doping was 10%,the ceramics had the smallest open porosity of 0.45%and the highest flexural strength of 104 MPa.After melting TiAl alloy with 10 wt%La_(2)O_(3)-doped Y_(2)O_(3)ceramics,a transition layer with an average thickness of 2.10μm appeared at the interface,and the phase of the transition layer was YLaO_(3).A physical dissolution reaction occurred between ceramic and alloy.The oxygen mass fraction of alloy melt was 2400 mg·kg^(-1)and was only about 70%of that of ceramics without doping La_(2)O_(3).

关 键 词：La_(2)O_(3)掺杂Y_(2)O_(3)陶瓷 真空烧结 TiAl合金熔炼 物理溶蚀 

分 类 号：TB34[一般工业技术—材料科学与工程]