A porous glass-ceramic enjoyed very low and negative thermal expansion was prepared. A glass of the base molar composition, 2 MgO·2 Al₂O₃·2 B₂O₃·5 SiO₂ with the addition of 1.61 ma% TiO₂, was melted from kaolin, magnesite, silica sand and boric acid. The composition is based on cordierite where 50 % Al₂O₃ were replaced by an equimolar concentration of B₂O₃. The glass was crashed and powdered, subsequently plastified, uniaxially pressed and finally sintered at temperatures in the range from 1100 to 1300 °C. X-ray diffraction of sintered samples gave evidence of a cordierite like crystalline phase. Scanning electron microscopy and electron dispersive microanalysis of samples prepared at 1300 °C showed crystals with hexagonal shape doped by TiO₂, B₂O₃ and Fe₂O₃ embedded in a glassy matrix. With increasing crystallization temperature, the porosity of the glass-ceramics increased from 8.99 % (at 1200 °C for 3 min) to 56.42 % (at 1300 °C for 3 min). This led to a decrease of the specimen density from 1.9880 to 1.1278 g/cm³ whereas the skeletal density increased from 2.1303 g/cm³ to 2.5878 g/cm³. The microhardnesses were in the 5.60 and 6.00 GPa range. The coefficient of thermal expansion was between −3.26 and −2.27×10⁻⁶ K⁻¹ from room temperature up to 300 ^oC and −0.45 and 1.89×10⁻⁶ K⁻¹ from room temperature up to 500 °C. For the first time, to the best of our knowledge, a porous cordierite glass-ceramic with negative thermal expansion is reported. The partial replacement of Al₂O₃ by B₂O₃ enables to apply lower melting temperature which is advantageous for the production process.

多孔玻璃陶瓷具有非常低的热膨胀，并且制备了负的热膨胀。从高岭土，菱镁矿，硅砂和硼酸中熔化基础摩尔组成为2 MgO·2 Al ₂ O ₃ ·2 B ₂ O ₃ ·5 SiO ₂的玻璃，并添加1.61 ma％TiO ₂。该组合物基于堇青石，其中50％的Al ₂ O ₃被等摩尔浓度的B ₂ O ₃代替。将玻璃粉碎并粉末化，随后塑化，单轴压制，最后在1100至1300°C的温度下烧结。烧结样品的X射线衍射显示出堇青石状结晶相的证据。在1300°C下制备的样品的扫描电子显微镜和电子弥散分析表明，六方晶形的晶体被TiO ₂，B ₂ O ₃和Fe ₂ O ₃掺杂在玻璃状基质中。随着结晶温度的升高，玻璃陶瓷的孔隙率从8.99％（在1200°C下持续3分钟）增加到56.42％（在1300°C下持续3分钟）。这导致样品密度从1.9880降低到1.1278 g / cm ³骨骼密度从2.1303 g / cm ³增加到2.5878 g / cm ³。显微硬度在5.60和6.00GPa范围内。从室温到最高300 ^o C ，热膨胀系数在-3.26和−2.27×10 ^-6 K ^-1之间；从室温到500°C ，热膨胀系数在-0.45和1.89×10 ^-6 K ^-1之间。据我们所知，这是首次报道了具有负热膨胀的多孔堇青石玻璃陶瓷。部分置换的Al ₂ ö ₃中箭头B ₂ ö ₃ 能够施加较低的熔化温度，这对生产过程有利。