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A Quantitive Oil Bleeding Evaluation Method for Thermal Conductive Gap Pads in Telecom Industry
Keywords: Oil Bleeding Evaluation Method, TIMs, Telecom Industry
It is well known that oil will inevitably come out from silicone based TIMs (Thermal Interface Material) when they are suffered from external impacts. Not only the appearance will be damaged by the bleeds, electrical connections related to silicone's insulation property will also be affected. Oil bleeding level is becoming an important indicator when customers choose TIMs, therefore, a quick testing method is necessarily needed to quantify oil bleeds of TIMs in application. In this paper, different factors affecting oil bleeding, which are common in Telecom Industry, including temperature, humidity, pressure etc., have been widely discussed, and a method to evaluate oil bleed level was derived. In this method, filter papers were placed on both sides of pads to suck oil bled while shims and scaled Al plates was applied on the silicone pad to control defection rate. The whole fixture would be heated in oven up to certain temperature to accelerate oil bleeding. Weight variation of gap pads caused by environment factors could be calculated, and then converted to volume changes, which is the way to quantify bleeding levels. Comparison test with Huawei has proved that this method for quantitive measurement of oil bleeding is reliable and effective.
J. Q. Zhao, R&D Manager
Laird Technologies, Thermal BU

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