α-Cordierite glass-ceramic coating was fabricated on the porous BN/Si₂N₂O ceramic by glass-ceramic method. The effect of the heating temperature on the phase composition, microstructure, mechanical properties, water resistance and dielectric properties of the coatings was investigated. A large amount of α-cordierite precipitated from the glass phase when the heating temperature was 1050 °C and the content of α-cordierite in the coating increased with increasing the heating temperature. The resulting α-cordierite glass-ceramic coatings had a good wettability and adhesion with the porous ceramic substrate. The coating/substrate interface was continuous without defects. When the heating temperature was 1050–1200 °C, the resulting coatings possessed positive mechanical properties and good water resistance due to the high densification. And the dielectric constant and loss tangent of the coated samples prepared at 1050–1200 °C were 4.1–4.3 and 0.005–0.01 respectively in the frequency of 21–36 GHz.

采用玻璃陶瓷法在多孔BN / Si ₂ N ₂ O陶瓷上制备α-堇青石玻璃陶瓷涂层。研究了加热温度对涂层相组成，微观结构，力学性能，耐水性和介电性能的影响。当加热温度为1050℃时，大量的α-堇青石从玻璃相中析出，并且随着加热温度的升高，涂层中的α-堇青石的含量增加。所得的α-堇青石玻璃-陶瓷涂层具有良好的润湿性和与多孔陶瓷基材的附着力。涂层/基材界面是连续的，没有缺陷。当加热温度为1050–1200°C时，由于高致密化，所得涂层具有积极的机械性能和良好的耐水性。在1050–1200°C下制备的涂层样品在21–36 GHz频率下的介电常数和损耗角正切分别为4.1–4.3和0.005–0.01。