Sintering characteristics, microstructures and dielectric properties of borosilicate-based glass/alpha-Al2O3 composites for LTCC application with different MgO and Na2O contents

Liu, Ming; Xu, Xiaoying; Zhou, Hongqing; Yue, Zhenxing; An, Ziqi

doi:10.1007/s10854-020-03667-2

Cited by 9 publications

(5 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, when the sintering temperature of CBS glass/Al2O3 composites is higher than the Tf of CBS glass, liquid CBS glass used as a sintering aid can fully cover Al2O3 particles, which makes CBS glass/Al2O3 composites sintered and reduce the pores of the composites. Moreover, an exothermic peak of CBS glass corresponding to the onset of crystallization temperature (To) of 904 °C is also shown on the DSC curve, and the following DSC curve indicates the continuous crystallizing process of CBS glass [15,23]. By comparison with reported CBS glass with the onset of crystallization temperature of about 700 °C-850 °C [15,23], the CBS glass in this paper possesses higher To; therefore, our CBS glass/Al2O3 composites sintered at 850 °C-900 °C cannot crystallize.…”

Section: Resultsmentioning

confidence: 99%

“…Moreover, an exothermic peak of CBS glass corresponding to the onset of crystallization temperature (To) of 904 °C is also shown on the DSC curve, and the following DSC curve indicates the continuous crystallizing process of CBS glass [15,23]. By comparison with reported CBS glass with the onset of crystallization temperature of about 700 °C-850 °C [15,23], the CBS glass in this paper possesses higher To; therefore, our CBS glass/Al2O3 composites sintered at 850 °C-900 °C cannot crystallize. The chemical structures of dry gels and CBS glass were investigated using the Fourier transform infrared (FTIR) spectrum in Figure 2.…”

Section: Resultsmentioning

confidence: 99%

“…Moreover, according to careful observation of these SEM images, when the sintering temperature of composites increases from 850 • C to 870 • C, the composite has fewer pores. This is because the wettability of CBS glass is improved with an increase in sintering temperature, and wetter-flowing liquid glass can coat Al 2 O 3 particles more fully, which makes fewer pores and denser composites [5,15]. However, if the sintering temperature increases from 870 • C to 900 • C, more pores appear on the composites.…”

Section: Resultsmentioning

confidence: 99%

“…However, if the sintering temperature increases from 870 • C to 900 • C, more pores appear on the composites. This is because higher sintering temperatures cause an "over-burning" phenomenon, leading to a loose structure of the composites and increasing the pores [15]. Furthermore, Figure 6 shows the AFM images of surfaces of CBS glass/Al 2 O 3 composites at different sintering temperatures.…”

Section: Resultsmentioning

confidence: 99%

“…Luo et al found that a proper Al 2 O 3 content in CBS glass can promote sintering densification and enhance the mechanical strength of glass/Al 2 O 3 composites [14]. At the same time, researchers have also investigated the effect of alkali metal oxides such as Li 2 O, Na 2 O, and MgO in CBS glass on the sintering densification of Al 2 O 3 LTCC materials [15,20]. However, adding these metal oxides in CBS glass provides limited improvements to the mechanical properties of LTCCs, in which the maximum flexural strengths are about 200 MPa; therefore, researchers have paid attention to the influences of B 2 O 3 and SiO 2 contents on the mechanical strength of composites.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Preparation of Sol–Gel-Derived CaO-B2O3-SiO2 Glass/Al2O3 Composites with High Flexural Strength and Low Dielectric Constant for LTCC Application

Ni,

Li,

Hou

et al. 2024

Materials

View full text Add to dashboard Cite

Low-temperature co-fired ceramic (LTCC) substrate materials are widely applied in electronic components due to their excellent microwave dielectric properties. However, the absence of LTCC materials with a lower dielectric constant and higher mechanical strength restricts the creation of integrated and minified electronic devices. In this work, sol–gel-derived CaO-B2O3-SiO2 (CBS) glass/Al2O3 composites with high flexural strength and low dielectric constant were successfully prepared using the LTCC technique. Among the composites sintered at different temperatures, the composites sintered at 870 °C for 2 hours possess a dielectric constant of 6.3 (10 GHz), a dielectric loss of 0.2%, a flexural strength of 245 MPa, and a CTE of 5.3 × 10−6 K−1, demonstrating its great potential for applications in the electronic package field. By analyzing the CBS glass’ physical characteristics, it was found that the sol–gel-derived glass has an extremely low dielectric constant of 3.6 and does not crystallize or react with Al2O3 at the sintering temperature, which is conducive to improving the flexural strength and reducing the dielectric constant of CBS glass/Al2O3 composites.

show abstract