熱膨張係数がゼロに近い多孔質材料の開発

概要

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A porous material having near zero thermal expansion (NZTE) around room temperature was developed. This material was prepared by sintering a mixture of SiC, 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 14 GPa. Through X-ray diffraction (XRD) and scanning electron microscopy (SEM) it was determined that no reaction occurred between SiC 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, allowed the development of porous SiC materials having NZTE at room temperature.
社団法人日本セラミックス協会の論文
2006-12-01