Crystallization Behavior of Glass Ceramic Filler During Joining Process

doi:10.15541/jim20150255

Abstract

Abstract:

A CaO-Al₂O₃-SiO₂ system glass ceramic with addition of Li₂O and Fe₂O₃ was developed to join alumina ceramics. The crystallization behavior of the glass interlayer during joining process was investigated by DTA, SEM and XRD. The effect of joint microstructure and phase composition on the joint strength was study. The results show that LiAlSi₂O₆, CaSiO₃, Ca₃Fe₂Si₃O₁₂, and CaAl₂Si₂O₈ are formed in the glass during conventional crystallization treatment. However, when the glass was used to join alumina, the crystallization behavior of the glass interlayer is closely related to the heating cycle. Direct cooling from joining temperature leads to completely amorphous interlayer formation, due to the absence of enough nucleation driving force. An extra nucleation-crystallization treatment during cooling contributes to crystallization of the glass interlayer in joints. Meannhile, the phase composition of glass interlayer can be adjusted by changing the crystallization temperature according to the DTA results. In addition, the joint strength is highly sensitive to crystalline phases in the interlayer. When there is only CaAl₂Si₂O₈ formed in the interlayer, the joint strength reaches as high as 247.5 MPa. By contrast, when there is LiAlSi₂O₆ or Ca₃Fe₂Si₃O₁₂ formed in the interlayer, the joint strength is only 10-135 MPa.

Key words: alumina, glass ceramic, joining, crystallization behavior

CLC Number:

TQ174

ZHU Wei-Wei, CHEN Ji-Chun. Crystallization Behavior of Glass Ceramic Filler During Joining Process[J]. Journal of Inorganic Materials, 2015, 30(12): 1310-1314.

Figures/Tables 9

Table1 Chemical composition of the glass/wt%

CaO	Al₂O₃	SiO₂	Li₂O	Fe₂O₃
22	23	45	5	10

Fig. 1 Thermal cycling curves for joining alumina

Fig. 2 Thermal expansion curves of the CAS based glass and alumina ceramic

Fig. 3 DTA curve of the CAS-based glass

Fig. 4 XRD patterns of CAS glass crystallized at different temperatures

Fig. 5 SEM images of joints obtained with heating curve I. (a) Low magnification (b) High magnification

Fig. 6 SEM images of the joints obtained with heating curve II and crystallized at different temperatures. (a) 730℃; (b) 820℃; (c) 860℃; (d) 980℃; (e) 1070℃; (f) 1080℃. L=LiAlSi2O6; S=CaSiO3; F=Ca3Fe2Si3O12; C=CaAl2Si2O8

Fig. 7 XRD patterns of the joints obtained with heating curve II and crystallized at different temperatures. (a) 730℃; (b) 820℃; (c) 860℃; (d) 980℃; (e) 1070℃; (f) 1080℃

Table 2 Phase composition and strength of joints

Samples	Crystalline phase	Strength/MPa
1	No	175±8
2	L	111.2±9
3	L+S+F	57±15
4	L+S+F+C	10±5
5	L+S+C	15±7
6	L+C	135.3±7
7	C	247.5±10

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