研究目的
Investigating the feasibility of joining Yttrium Iron Garnet (YIG) and Magnesium Titanate Ceramic (MTC) with a bismuth-based glass braze, focusing on the microstructure and mechanical strength of the joint.
研究成果
The study successfully demonstrated the feasibility of joining YIG and MTC using a bismuth-based glass braze, with optimal mechanical properties achieved at specific process parameters. The formation of whiskers and lamellar phases at the interfaces contributed to the joint's strength by altering crack propagation paths. The research provides a foundation for further exploration of glass brazes in joining functional ceramics.
研究不足
The study is limited to the specific composition of the bismuth-based glass braze and the selected base materials (YIG and MTC). The effects of other glass compositions or base materials were not explored. Additionally, the study focuses on mechanical and microstructural properties, leaving electromagnetic properties largely unaddressed.
1：Experimental Design and Method Selection:
The study involved the synthesis of a bismuth-based glass braze (Bi25) using the conventional melt quenching method, followed by its application to YIG and MTC substrates via screen printing. The bonding process was executed in an electric resistance furnace with varying temperatures, holding times, and pressures.
2：Sample Selection and Data Sources:
YIG ferrite and MTC were selected as base materials. The bismuth-based glass braze composition was tailored for the study.
3：List of Experimental Equipment and Materials:
Equipment included a differential scanning calorimeter (DSC), a dynamic contact angle system, a thermal analysis system, scanning and transmission electron microscopes, a universal testing machine, and Vickers micro hardness and nano-indenters.
4：Experimental Procedures and Operational Workflow:
The study involved wettability tests, thermal expansion measurements, microstructure examination, and mechanical strength assessments under various process parameters.
5：Data Analysis Methods:
Elemental distribution was analyzed using energy dispersive X-ray spectroscopy (EDS), phase compositions were determined via X-ray diffraction (XRD), and mechanical properties were evaluated through shear strength measurements and indentation tests.
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Scanning Electron Microscope
HELIOS NanoLab 600i
FEI
Examining the morphology and microstructure of the YIG ferrite/Bi25 glass braze/MTC interfaces
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Field Emission Transmission Electron Microscope
Talos F200x
FEI
Examining the electron diffraction of selected areas within the joint domain
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Universal Testing Machine
AG-X Plus 20 kN/5 kN
Shimadzu
Measuring the shear strength
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Nano Indenter
Nano Indenter G200
Agilent
Performing nano-indentation
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Differential Scanning Calorimeter
STA449F3
NETZSCH
Analysis of Bi25 glass powder
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Dynamic Contact Angle System
OCA25HTV
Dataphysics
Studying the wettability of Bi25 glass braze on YIG ferrite and MTC substrates
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Thermal Analysis System
NETZSCH DIL 402C
NETZSCH
Evaluating the coefficients of thermal expansion (CTE) of Bi25 glass braze, YIG ferrite and MTC
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Vickers Micro Hardness Tester
HXD-1000TM
Performing micro-indentation
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X-ray Diffractometer
X’pert
Philips
Analyzing the phase compositions of YIG ferrite/Bi25 glass braze/MTC interfaces
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