Breakthrough welding solutions for hermetic encapsulation
Primoceler – your partner for glass encapsulation GLASS WELDING UNIT ENGINEERING KNOW-HOW § § Laser based welding Solution specification tool and software for § Laboratory & clean room hermetic encapsulation facilities for testing § Installation and training § Tailored solutions for § Technical support and R&D and manufacturing maintenance
Example all in glass encapsulation • top glass 1mm • bottom glass 3mm • no other materials than glass • welding seam width less than 30 µm 100 x magnification of welding seam 500 x magnification of welding seam
Temperature cycling test § Glass-glass temperature cycling test according to MIL-STD-750, method 1051 were performed at Toptester Ltd (ISO/IEC 17025 certified test house) § Effect of temperature cycling on glass welds were investigated
Experimental setup § Test condition C (-55 o C…+175 o C), 20 cycles § Transfer time < 1 min § Total duration of the test 11 hours § Sample holder enables free air flow, and does not store heat § Temperature change of the samples were ensured with sensor attached to the samples
Experimental setup Cold soak on the left, hot soak on the right. Temperature sensor attachted to the sample.
Results § Failure analysis were performed for the tested samples § No visual changes in the weld seams § Die shear strength test (MIL-STD-883) to ensure the mechanical properties of the weld No changes in the weld seam No changes in strength values compared to § (side view, etched). the tests performed earlier without temperature cycling
Adhesive vs. Primoceler welding Adhesive or frit Primoceler welding UV or high temperature curing No adhesive or other extra materials needed § § necessary § Good long term stability and 100% hermeticity § Extra material needed: Might cause § Small heat affected zone (HAZ) problems due to fumes or particles § Extremely thin welding seam: as thin as 30 µm § Long term stability uncertain in varying possible environmental conditions § Superior bond strength § Problems with hermeticity Highly repeatable process §
Contact for more information § Mr. Ville Hevonkorpi § ville.hevonkorpi@primoceler.com § Mobile +385 40 505 7623
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