Structure and Properties of ZnO-B2O3-SiO2-BaO Glass for Copper Paste

Abstract

Abstract: The effect of ZnO content on structure and properties of ZnO-B₂O₃-SiO₂-BaO glass as a research object for copper paste was studied by X-ray diffraction (XRD), fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), raman spectroscopy (Raman), ²⁷Al nuclear magnetic resonance aluminum spectroscopy (²⁷Al NMR), differential scanning calorimetry (DSC) and scanning electron microscopy (SEM). The results show that with the increase of ZnO content, the molar ratio of BO/NBO,the average bridge oxygen number and the molar ratio of [ZnO₄]/[ZnO₆] all increases first and then decreases, the molar ratio of [BO₄]/[BO₃] increases, the molar proportion of [AlO₆] and [AlO₅] increases and the molar proportion of [AlO₄] decreases in glass samples, which results in the trend first dense and then loose in the connection degree of network structure of glass samples. Among them, the network structure is the densest when the ZnO content is 36% (mass fraction). With the increase of ZnO content from 32% to 42% (mass fraction), the glass transition temperature T_g, initial sintering temperature T_S1 and the coefficient of thermal expansion (CTE) decrease first and then increase, and the CTE value range is 6.0×10^-6~6.3×10^-6 K^-1. It meets the requirements of thermal expansion and sintering temperature for sealing copper paste with Ca_1-xSr_xZrO₃ ceramic substrate.

Key words: ZnO-B₂O₃-SiO₂-BaO glass, sealing glass, low melting point glass, copper paste, sintering temperature, glass network structure

CLC Number:

TQ171

ZHENG Congcong, HE Feng, ZHANG Bing, CAO Xiuhua, ZHANG Yongqiang, WEI Mingjie, DONG Peng, XIE Junlin. Structure and Properties of ZnO-B₂O₃-SiO₂-BaO Glass for Copper Paste[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(4): 1475-1487.

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Structure and Properties of ZnO-B₂O₃-SiO₂-BaO Glass for Copper Paste

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