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为实现建筑用玻璃与可伐合金的可靠激光封接,本文针对影响封接质量的主要因素(温度、时间、粗糙度及氧化层)对两者润湿性能的影响开展了研究.当保温温度由800℃提高至900℃,液态玻璃黏度降低致使其在可伐合金表面的流动性增强,润湿角由69.5°降低至31.1°.在850℃下延长保温时间(5~40 min),液态玻璃在低黏度条件下有充分的时间铺展,润湿角降幅为30%.随着可伐合金表面粗糙度的提高,液态玻璃向四周扩散需要克服的势垒增加,当粗糙度值Ra由0.186μm升至0.563μm时,润湿角由46.9°升至69.5°.由于可伐合金表面氧化层可与液体玻璃发生扩散而形成较强离子键,使得两者润湿性能显著提高,润湿角降低幅度达到23.6%.因此,在实际激光封接过程中,增加保温温度和时间、降低钢板表面粗糙度及钢板预氧化处理将有效地提高玻璃与钢板的润湿性能.
In order to achieve the reliable laser sealing of architectural glass and kovar, the influence of the main factors affecting the sealing quality (temperature, time, roughness and oxide layer) on the wetting properties of both glass and Kovar was studied.When the holding temperature From 800 ℃ to 900 ℃, the decrease of liquid glass viscosity led to the increase of liquidity on the surface of Kovar and the decrease of wetting angle from 69.5 ° to 31.1 °. The holding time (5 ~ 40 min) at 850 ℃, The glass has enough time to spread under the conditions of low viscosity and the wetting angle decreases by 30% .With the increase of the surface roughness of Kovar, the potential barrier to overcome the diffusion of liquid glass to the periphery increases. When the roughness Ra increases from 0.186 μm to 0.563μm, the wetting angle increased from 46.9 ° to 69.5 °, Kovar alloy surface oxide layer can diffuse with liquid glass to form stronger ionic bonds, which leads to the significant improvement of wettability. The wetting angle Reduce the rate of 23.6% .Thus, in the actual laser sealing process, increasing the holding temperature and time, reducing the surface roughness of steel and pre-oxidation of steel will effectively improve the wettability of glass and steel.