我是担心crown的材料。现在大多是用porcelain/ceramic substrate。 可我一查材料,还像也让人担心
porcelain/ceramic substrate:
curamik® high temperature/ high voltage substrates consist of pure copper bonded to a ceramic substrate such as Al2O3 (Alumina), AlN (Aluminum Nitride), HPS (ZrO2 doped) or silicon based Si3N4 (Silicon Nitride). curamik provides two technologies to attach the substrate with the copper.