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发明公开
CN105074909A 导热性绝缘片、功率模块及其制造方法 有权

导热性绝缘片、功率模块及其制造方法
摘要：
为了确保优异的导热性及电绝缘性，在通过传递模塑法制造具备将含有使鳞片状氮化硼的一次粒子凝聚了的二次凝聚粒子的无机填充材料分散于热固化性树脂中的导热性绝缘片的功率模块时，进行未固化或半固化状态的导热性绝缘片的固化以使得由下述式(1)表示的导热性绝缘片的固化度的变化率成为30％以上。导热性绝缘片的固化度的变化率(％)＝[(B-C)/B]×100(1)(式中，B表示在传递模塑前的未固化或半固化状态的导热性绝缘片在完全固化前用差示扫描热量计测定的放热量(cal/g)，C表示在将传递模塑前的未固化或半固化状态的导热性绝缘片在180℃下加热处理90秒之后在完全固化前用差示扫描热量计测定的放热量(cal/g))。
摘要（英）：

In order to retain superior thermal conductivity and electrical insulation when using a transfer mold method to manufacture a power module equipped with a thermally conductive insulating sheet in which an inorganic filler is dispersed in a thermosetting resin, the inorganic filler containing secondary aggregated particles formed from aggregates of primary particles of flaky boron nitride, in the present invention the curing of the thermally conductive insulating sheet is carried out so that the percentage of change, indicated in formula (1), of the curing degree of the uncured or semi-cured thermally conductive insulating sheet reaches at least 30%. (1) Percentage (%) of change of curing degree of thermally conductive insulating sheet = [(B-C)/B]*100 (In the formula, B represents the calorific value (cal/g), as measured by a differential scanning calorimeter, from the pre-transfer molding uncured or semi-cured thermally conductive insulating sheet until curing is complete, and C represents the calorific value (cal/g), as measured by a differential scanning calorimeter, from the pre-transfer molding uncured or semi-cured thermally conductive insulating sheet after being heat treated at 180 DEG C for 90 seconds until curing is complete).

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