Low -temperature sintering of Al2O3 ceramics doped with 4CuO-Ti O2-2Nb2O5 composite oxide sintering aid

被引：47

作者：

Yang, Yan ^{[1
,2
]}

Ma, Mingsheng ^{[1
]}

Zhang, Faqiang ^{[1
]}

Liu, Feng ^{[1
]}

Chen, Guanyu ^{[1
]}

Liu, Zhifu ^{[1
,2
]}

Li, Yongxiang ^{[1
]}

机构：

[1] Chinese Acad Sci, Shanghai Inst Ceram, CAS Key Lab Inorgan Funct Mat & Devices, Shanghai 200050, Peoples R China

[2] Univ Chinese Acad Sci, Ctr Mat Sci & Optoelect Engn, Beijing 100034, Peoples R China

来源：

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2020年 / 40卷 / 15期

基金：

中国国家自然科学基金;

关键词：

Alumina; 4CuO-TiO2-2Nb(2)O(5); Low-temperature sintering; Grain boundary; LTCC; DENSIFICATION BEHAVIOR; DIELECTRIC-PROPERTIES; ALUMINA; NICKEL; FILMS; TIO2;

D O I：

10.1016/j.jeurceramsoc.2020.06.068

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Dense alumina ceramics doped with 5 wt% 4CuO-TiO2-2Nb(2)O(5) composite sintering aids were obtained at low sintering temperatures of 950 similar to 975 degrees C. The ceramic sintered at optimal condition shows good microwave dielectric properties (epsilon(r) = 12.7, Q x f = 7400 GHz), high thermal conductivity (18.4 W/m K) and high bending strength (320 MPa). TEM and EDS analysis revealed that amorphous Cu-Ti-Nb-O interfacial films with nanometer thickness formed at the grain boundaries, which could provide paths of mass transportation for densification. Al3+ ions may be involved in mass transportation through substitution by Ti3+ and Ti4+ ions near the grain boundary during the sintering process. The accumulation of copper ions at the trigeminal grain boundary was observed. The migration and reaction of copper ions in grain boundaries may also play an important role in promoting mass transportation and low-temperature densification of alumina ceramics.

引用

页码：5504 / 5510

页数：7

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