Abstract
A porous material having near zero thermal expansion (NZTE) around room temperature was developed. This material was prepared by sintering a mixture of SiC or Al_2O_3, vitrified bonding material (VBM) and LiAlSiO_4 at 850℃. LiAlSiO_4 was added in different weight proportions, and it was found that a change in the amount of LiAlSiO_4 leads to a material with NZTE at room temperature, porosity around 50%, and Young's modulus around 14GPa. Through X-ray diffraction and scanning electron microscopy it was determined that no reaction occurred between SiC or Al_2O_3 and LiAlSiO_4 during sintering, and they are joined by the VBM, which melted at the sintering temperature. In conclusion, the addition of LiAlSiO_4 and VBM to SiC or Al_2O_3, allowed the development of porous SiC or Al_2O_3 materials having NZTE at room temperature.
