Preparation and sealing effects of Mg-Al-Si-Ba-O-based glass-ceramic coatings on NTC thermistors

被引:8
作者
Zhao, Yan [1 ]
Zhao, Pengjun [1 ]
Zhao, Qing [1 ]
He, Donglin [1 ]
Kong, Wenwen [1 ]
Wu, Bing [1 ]
Chang, Aimin [1 ]
机构
[1] Chinese Acad Sci, Xinjiang Tech Inst Phys & Chem, Key Lab Funct Mat & Devices Special Environm, Xinjiang Key Lab Elect Informat Mat & Devices, Urumqi 830011, Peoples R China
基金
中国科学院西部之光基金; 中国国家自然科学基金;
关键词
Glass-ceramic sealant; NTC thermistor; Thermal shock resistant; Mg-Al-Si-Ba-O sealing effect; CRYSTALLIZATION; TEMPERATURE; SEALANTS; PERFORMANCE; PARAMETERS;
D O I
10.1016/j.ceramint.2022.04.290
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
Herein, Mg-Al-Si-Ba-O-based glass ceramics were studied as potential candidates to protect Mn-Co-Ni-O-based negative temperature coefficient (NTC) thermistors at high temperatures such as 900 ?. The ceramics were prepared in three glass formulations (1#: 15MgO-15Al(2)O(3)-44.7SiO(2)-25BaO, 2#: 17MgO-17Al(2)O3-41SiO(2)-25BaO and 3#: 17MgO-17Al(2)O3-41SiO(2)-20BaO-5Y(2)O3 (in mol%)) and their glass-transition temperatures (Tg) were determined using the differential scanning calorimetry (DSC) method. Scanning electronic microscopy (SEM) and X-ray diffraction (XRD) were used to characterize the parent glasses and glass ceramic coatings. The sealing effects of the glass ceramics were examined by conducting an insulation test. The glass-ceramic sealing structures were subjected to 1000 thermal shock cycles at temperatures varying from room temperature to 900?. Notably, the sealing structure of glass-ceramic coating 1# was compact at a Tg of 760.9 ?. The glass-ceramic coatings effectively maintained the NTC properties of the sensitive ceramics in all three formulations. Interestingly, the glass-ceramic coating 3# containing Y2O3 demonstrated an increase in electrical resistance. Both the NTC thermistors coated with 1# and 2# glass formulations successfully passed 1000 thermal shock cycles without visible failures, and their resistance change ratios were well below the requisite 20%.
引用
收藏
页码:23104 / 23110
页数:7
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