Machinable glass ceramic and preparation method thereof

The invention provides a machinable glass ceramic and relates to the technical field of glass ceramics. The machinable glass ceramic is mainly composed of the following components in parts by weight: 30-58 parts of CaF2, 0.5-5 parts of SnO2, 1-3 parts of Li2O, 7-15 parts of Al2O3, 13-21 parts of MgO, 0.5-2.5 parts of TiO2, 8-12 parts of K2O, 0-5 parts of SrZrO3, 0-10 parts of BaO, 6-10 parts of SiO2, 3-7 parts of MoSi2, 0-10 parts of La2O3, 0-5 parts of Y2O3, 0-5 parts of Tm2O3 and 1-15 parts of H3BO4. Based on the volume, the glass ceramic is composed of 50-95% of a crystal phase and 5-50% of a glass phase, wherein the crystal phase of the glass ceramic is fluorine mica. The machinable glass ceramic provided by the invention has high service temperature and excellent dielectric property, and a film product has high flexibility and flanging quality. 本发明提供了种可机械加工玻璃陶瓷，涉及微晶玻璃技术领域。主要由以下重量份成分组成：CaF30～58份、SnO0.5～5份、LiO 1～3份、Al07～15份、Mg0 13～21份、TiO0.5～2.5份、KO 8～12份、SrZrO3 0～5份、BaO 0～10份、SiO6～10份、MoSi3～7份、LaO0～10份、YO