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    CORROSION-RESISTANT MEMBER
    2.
    发明公开
    CORROSION-RESISTANT MEMBER 审中-公开

    公开(公告)号：EP4043613A1

    公开(公告)日：2022-08-17

    申请号：EP20875257.6

    申请日：2020-09-03

    申请人： Showa Denko K.K.

    发明人： MIYAISHI, So ,  OKUBO, Masahiro ,  YOSHIMURA, Masayuki ,  SAKANE, Wataru ,  TANAKA, Teppei ,  NAKAMURA, Saeko ,  YAMAKI, Saori

    IPC分类号： C23C28/00 ,  C23C28/04 ,  C23C14/02 ,  C23C14/06 ,  C23C14/16 ,  C23C14/34 ,  C23C14/35 ,  C25D13/00 ,  C25D13/02 ,  C25D13/20 ,  C25D13/22 ,  H01L21/302

    摘要： There is provided a corrosion-resistant member in which a corrosion-resistant coating is difficult to peel off from a base material even when subjected to a thermal history. A corrosion-resistant member includes: a metal base material (10); a corrosion-resistant coating (30) formed on the surface of the base material (10); and a buffer layer (20) formed between the base material (10) and the corrosion-resistant coating (30). The base material (10) contains a main element which is an element having the highest mass content ratio among elements contained in the base material (10) and a trace element which is an element having a mass content ratio of 1% by mass or less. The corrosion-resistant coating (30) contains at least one kind selected from magnesium fluoride, aluminum fluoride, and aluminum oxide. The buffer layer (20) contains an element of the same kind as the trace element, and the content ratio obtained by energy dispersive X-ray analysis of the element of the same kind as the trace element contained in the buffer layer (20) is 2% by mass or more and 99% by mass or less.

    ABRASIVE GRAIN AND GRINDING WHEEL
    3.
    发明公开
    ABRASIVE GRAIN AND GRINDING WHEEL 审中-公开

    公开(公告)号：EP3848340A1

    公开(公告)日：2021-07-14

    申请号：EP21154680.9

    申请日：2018-12-19

    申请人： Showa Denko K.K.

    发明人： MIYAISHI, So

    IPC分类号： C04B35/117 ,  C04B35/80 ,  C09K3/14 ,  C23C28/04 ,  C04B35/645 ,  C04B35/111 ,  C04B41/85

    摘要： Problem to be Solved
    To provide an alumina sintered body, abrasive grains, and a grinding wheel having high hardness and excellent wear resistance.
    Solution
    Provided is an alumina sintered body including an inner layer in which alumina crystal grains contained have an average aspect ratio of 1.0 to 2.0 and an outer layer which covers at least a part of the inner layer from outside and in which alumina crystal grains contained have an average aspect ratio of more than 2.0, the alumina sintered body being free from silicon except unavoidable impurities.

    ELECTROFUSED ALUMINA GRAINS, PRODUCTION METHOD FOR ELECTROFUSED ALUMINA GRAINS, GRINDING STONE, AND COATED ABRASIVE
    6.
    发明公开
    ELECTROFUSED ALUMINA GRAINS, PRODUCTION METHOD FOR ELECTROFUSED ALUMINA GRAINS, GRINDING STONE, AND COATED ABRASIVE 审中-公开

    公开(公告)号：EP3475378A1

    公开(公告)日：2019-05-01

    申请号：EP17739706.4

    申请日：2017-06-22

    申请人： Showa Denko K.K.

    发明人： YAMAOKA, Satoshi ,  MIYAISHI, So ,  TOMIKAWA, Shinichiro

    IPC分类号： C09K3/14 ,  C04B35/107

    摘要： Provided are electrofused alumina grains excellent in grinding performance and a production method of such electrofused alumina grains, and a grinding stone and a coated abrasive using the electrofused alumina grains. The electrofused alumina grains of the present invention contain titanium and magnesium. The production method for the electrofused alumina grains includes the steps of: preparing a mixture material by mixing an alumina material, a titanium compound and a magnesium compound, forming an ingot from the mixture material according to an electrofusing process, grinding the ingot to prepare a ground powder, size-regulating the ground powder to have a predetermined grain size to prepare size-regulated grains, and heating the size-regulated grains at a heating temperature of 1,000° C. or higher to give electrofused alumina grains. The grinding stone contains the electrofused alumina grains. The coated abrasive contains the electrofused alumina grains.

    PRECURSOR OF ALUMINA SINTERED BODY, METHOD FOR PRODUCING ALUMINA SINTERED BODY, METHOD FOR PRODUCING ABRASIVE GRAINS, AND ALUMINA SINTERED BODY
    7.
    发明公开
    PRECURSOR OF ALUMINA SINTERED BODY, METHOD FOR PRODUCING ALUMINA SINTERED BODY, METHOD FOR PRODUCING ABRASIVE GRAINS, AND ALUMINA SINTERED BODY 审中-公开

    公开(公告)号：EP3733629A1

    公开(公告)日：2020-11-04

    申请号：EP18896983.6

    申请日：2018-12-25

    申请人： Showa Denko K.K.

    发明人： MIYAISHI, So ,  IINOU, Satoshi

    IPC分类号： C04B35/117 ,  B24D3/00 ,  C09K3/14

    摘要： The present invention relates to a precursor of an alumina sintered compact including aluminum, yttrium, and at least one metal selected from the group consisting of iron, zinc, cobalt, manganese, copper, niobium, antimony, tungsten, silver, and gallium, wherein the content of the aluminum is 98.0% by mass or more as expressed in terms of an oxide (Al 2 O 3 ) in 100% by mass of the precursor of an alumina sintered compact; the content of the yttrium is 0.01 to 1.35 parts by mass as expressed in terms of an oxide (Y 2 O 3 ) based on 100 parts by mass of the content of the aluminum as expressed in terms of an oxide; the total content of the metals selected from the foregoing group is 0.02 to 1.55 parts by mass as expressed in terms of an oxide based on 100 parts by mass of the content of aluminum as expressed in terms of an oxide; and the aluminum is contained as α-alumina.