| 摘要 |
MgO ceramics for electrically insulating substrates, have a microstructure wherein microscopically the majority of MgO crystals has a grain size of at most 5 mu m, and a thin 2MgO.SiO2 phase is uniformly distributed at the grain boundaries of MgO crystals; the ceramics have a heat conductivity of at least 0.08 cal/cm.sec. DEG C at normal temperature, a dielectric constant at 100 KHz of at most 10 at normal temperature, an electrical insulation resistance of at least 10<10> OMEGA .cm at 300 DEG C and an excellent resistance to humidity. |
