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    • 4. 发明申请
    • HOLDING SEAL MATERIAL AND METHOD FOR PRODUCING HOLDING SEAL MATERIAL
    • US20180283252A1
    • 2018-10-04
    • US15997699
    • 2018-06-05
    • IBIDEN CO., LTD.
    • Takahiko OKABEKiyonari HATANAKA
    • F01N3/28B01D53/94D04H1/4209D04H1/46B28B3/02B28B11/24C04B35/10C04B35/622C04B35/64
    • Provided is a holding seal material including: alumina fibers, wherein the alumina fibers contain 85 to 98 wt % of an alumina component and 15 to 2 wt % of a silica component, the holding seal material has multiple marks formed by needle punching, and in a heat treatment test, a contact pressure of the holding seal material heated at a test temperature of 950° C. is 65 to 99% of a contact pressure of the holding seal material heated at test temperature of 800° C., wherein the heat treatment test includes: a compressing step of disposing the holding seal material between an upper plate and a lower plate and compressing the holding seal material to a gap bulk density (GBD) of 0.3 g/cm3; a heating step of heating, after the compressing step, the compressed holding seal material to a predetermined test temperature at a temperature-increasing rate of 45° C./min and maintaining the holding. seal material at the test temperature for six hours; a releasing step of cooling, after the heating step, the holding seal material to room temperature and releasing the holding seal material to a gap bulk density (GBD) of 0.27 g/cm3; and a cycling step of repeating, after the releasing step, 1000 times the cycle of re-compression of the holding seal material to a gap bulk density (GBD) of 0.3 g/cm3 and re-release of the holding seal material to a gap bulk density (GBD) of 0.27 g/cm3 so as to calculate the contact pressure (kPa) of the holding seal material by dividing the load at the last re-release in the cycling step by the area of the holding seal material.