Laser-assisted glass frit bonding in air and vacuum
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摘要: 为了验证真空环境对玻璃激光焊接气孔形成的影响，采用在大气及真空条件下进行玻璃激光焊接对比试验的方法，对两种条件下气孔率随激光功率的变化及玻璃料向两端扩展的程度进行了理论分析和实验验证。结果表明，气孔的成因不仅是玻璃料中残存的气体，功率提高至45W后，不稳定成分的升华与分解产生了更多气体，进一步提高了气孔率; 真空条件对焊缝扩展影响较小，无明显差异；而真空条件下的气孔率要显著大于在大气条件下的气孔率; 真空条件下气孔面积更大，但增大的气孔面积并不能扩大玻璃料的扩展宽度。该研究结果进一步地揭示了玻璃激光焊接下气孔的形成机制。Abstract: In order to verify the effect of vacuum environment on the formation of pores in glass laser welding, the comparative test of glass laser welding under atmospheric and vacuum conditions was adopted.Theoretically analyze and experimentally verify of the change of porosity with laser power and the extent of expansion of glass frit to both ends under the two conditions was then carried out. The results show that, the cause of the porosity is not only the residual gas in the glass frit, but also the sublimation and decomposition of unstable components to produce more gas after the power is increased to 45W, which further improves the pores. It is found that the vacuum condition has little effect on the bonding expansion, and there is no obvious difference. The porosity under vacuum condition is significantly greater than that under atmospheric condition. The porosity is larger under vacuum condition, but the enlargement of porosity can't enlarge the expansion width of glass frit. The results further reveal the formation mechanism of pores under laser-assisted glass frit bonding.
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Keywords:
- laser technique /
- pores /
- laser bonding /
- vacuum /
- glass
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Figure 9. a—bonding width changes curve with laser power b—porosity changes curve with laser power
Table 1 Thermal properties of material used in the study
material transition temperature/℃ softening point/℃ coefficient of thermal expansion/ (10-7 ℃-1) glass substrate 722 971 31.7 glass frit 343 428 48 
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Table 2 Bonding parameters
number laser power P/W welding speed v/ (m·min-1) defocusing amount D/mm 1 37 0.1 -15 2 40 0.1 -15 3 45 0.1 -15 4 50 0.1 -15 5 55 0.1 -15 6 60 0.1 -15
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