METHOD FOR MECHANICAL TREATMENT OF A CONCRETE FLOOR

    公开(公告)号:WO2022238618A1

    公开(公告)日:2022-11-17

    申请号:PCT/FI2022/050303

    申请日:2022-05-06

    Applicant: CONCRIA OY

    Inventor: AHONEN, Mika

    Abstract: The invention relates to a method for a mechanical treatment of a concrete floor, such as troweling and blade finishing, using a hand-operated, a walk-behind or a ride-on actuator, such as a concrete power trowel machine, a floor treatment machine or the like. The actuator has one or more operating heads comprising a rotor consisting of two or more attachment arms. The floor surface is treated by means of concrete troweling elements, such as circular trowel pans or elongated trowel blades attached to the rotor attachment arms, made substantially of plastic material, that are detachably coupled to the rotor of the actuator, in particular to prevent discoloration of the treated floor surface during treatment. Before the concrete floor is treated with plastic- based concrete troweling elements, a water-soluble silica-based medium (V) is applied on it.

    一种用碳包覆制备低氧含量、高热导的氮化硅陶瓷的方法及其应用

    公开(公告)号:WO2021259388A1

    公开(公告)日:2021-12-30

    申请号:PCT/CN2021/114388

    申请日:2021-08-24

    Abstract: 本发明属于陶瓷技术领域,公开了一种用碳包覆制备制备低氧含量、高热导的氮化硅陶瓷的方法及其应用,该方法是将聚多巴胺包覆的的氮化硅粉末与烧结助剂混合,获得混合粉末置于石墨模具,在真空气氛下加热至600~800℃碳化,形成核壳结构的碳-氮化硅粉末,然后加以20~30MPa轴向压力,在保护气氛下,加热至1200~1500℃还原反应,再升温至1600~2000℃烧结,制得氮化硅陶瓷。本发明可精确控制碳层分布和精准调节碳层结构,有效还原氮化硅表面二氧化硅,降低氮化硅粉末氧含量,提高氮化硅陶瓷热导率。该氮化硅陶瓷的致密度高于98.5%,其热导率可达80W/(m·K)以上。

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