Hysol 9396加载氮化硼粉末湿膨胀系数的测定
Measuring the coefficient of moisture expansion of Hysol 9396 loaded with boron nitride powder
摘要：
未来的ATLAS ITk条带跟踪器将由安装在称为核心的支撑结构上的17，000个硅条带探测器模块组成。芯体由许多组件组装而成，其中包括碳纤维饰面、蜂窝结构和用于冷却的钛管周围的碳泡沫，使用载有氮化硼的双组分环氧树脂（Hysol 9396）以获得良好的导热性。粘合剂占芯重量的约20%。在操作过程中，使用两相二氧化碳将检测器冷却至-40 $^\circ$ C，并用干燥气体冲洗以防止冷凝。已经模拟了这种温度变化的影响，以研究不同材料之间的热膨胀系数（CTE）不匹配的影响，并调查所产生的变形和未对准。除了在冷却过程中粘合剂的收缩（可以使用其已知的CTE很好地估计）之外，用干燥气体冲洗检测器体积可以去除粘合剂中包含的水分，从而导致额外的收缩。为了估计干燥过程中收缩的影响，测量具有不同氮化硼含量的Hysol样品的湿膨胀系数（CME）以及它们的总体吸湿性，并将它们的程度与与冷却相关的收缩进行比较。
英文摘要：
The future ATLAS ITk strip tracker will consist of 17,000 silicon strip detector modules mounted on support structures called cores. Cores are assembled from a number of components, among others carbon fibre facings, honeycomb structure and carbon foam surrounding titanium tubes used for cooling, using a two-component epoxy (Hysol 9396) loaded with boron nitride for good thermal conductivity. The adhesive constitutes about 20 % of a core's weight. During operation, the detector is cooled down to -40 $^\circ$C using bi-phase carbon dioxide and flushed with dry gas to prevent condensation. The effect of this temperature change has been simulated to study the impact of Coefficient of Thermal Expansion (CTE) mismatches between different materials and investigate resulting deformations and misalignment. In addition to the shrinking of an adhesive during cooling, which can be estimated well using its known CTE, flushing the detector volume with dry gas removes the moisture contained in the adhesive, leading to an additional shrinking. In order to estimate the impact of shrinking during drying, the Coefficient of Moisture Expansion (CME) of Hysol samples with different contents of boron nitride as well as their overall moisture absorption were measured and their extent compared to the contraction associated with cooling.
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