Provided are a laminate including a silver layer on a substrate, in which the silver layer includes a surface in which Kurtosis of a roughness curve satisfies at least one of Condition (i) the change rate of Kurtosis is greater than or equal to 50% under conditions of a temperature of 85° C. and a relative humidity of 85% after 240 hours have elapsed and Condition (ii) the change rate of Kurtosis is greater than or equal to 200% under conditions of a temperature of 85° C. and a relative humidity of 85% after 480 hours have elapsed, and a circuit board in which an electronic component is mounted on the surface of the laminate through a conductive joint portion.
提供了一种层压板,包括基底上的
银层,其中
银层包括一个表面,在该表面上,粗糙度曲线的 Kurtosis 至少满足以下条件之一:条件 (i) 在温度为 85°C 和相对湿度为 85% 的条件下,经过 240 小时后,Kurtosis 的变化率大于或等于 50%;条件 (ii) 在温度为 85°C 和相对湿度为 85% 的条件下,Kurtosis 的变化率大于或等于 200%。和条件(ii)在温度为 85 摄氏度和相对湿度为 85%的条件下,经过 480 小时后,Kurtosis 的变化率大于或等于 200%。