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公开(公告)号：US20220195605A1
公开(公告)日：2022-06-23
申请号：US17595413
申请日：2020-09-03
Applicant: SHOWA DENKO K.K.
Inventor： So MIYAISHI , Masahiro OKUBO , Masayuki YOSHIMURA , Wataru SAKANE , Teppei TANAKA , Saeko NAKAMURA , Saori YAMAKI
Abstract: A corrosion-resistant member including: a metal base material (10); and a corrosion-resistant coating (30) formed on the surface of the base material (10). The corrosion-resistant coating (30) is a stack of a magnesium fluoride layer (31) and an aluminum fluoride layer (32) in order from the base material (10) side. The aluminum fluoride layer (32) is a stack of a first crystalline layer (32A) containing crystalline aluminum fluoride, an amorphous layer (32B) containing amorphous aluminum fluoride, and a second crystalline layer (32C) containing crystalline aluminum fluoride in order from the magnesium fluoride layer (31) side. The first crystalline layer (32A) and the second crystalline layer (32C) are layers in which diffraction spots are observed in electron beam diffraction images obtained by electron beam irradiation and the amorphous layer (32B) is a layer in which a halo pattern is observed in an electron beam diffraction image obtained by electron beam irradiation.
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公开(公告)号：US20200001432A1
公开(公告)日：2020-01-02
申请号：US16484733
申请日：2018-12-19
Applicant: SHOWA DENKO K.K.
Inventor： So MIYAISHI
Abstract: To provide an alumina sintered body, abrasive grains, and a grinding wheel having high hardness and excellent wear resistance. An alumina sintered body comprising: an inner layer comprising alumina crystal grains; and an outer layer covering at least a part of the inner layer from outside, having a higher content of an alkaline earth metal than the inner layer, and comprising alumina crystal grains, wherein the content of the alkaline earth metal in the outer layer is 1.0 to 30.0 mass % in terms of oxide, the alumina sintered body being free from silicon except unavoidable impurities.
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公开(公告)号：US20220251699A1
公开(公告)日：2022-08-11
申请号：US17611768
申请日：2020-09-03
Applicant: SHOWA DENKO K.K.
Inventor： So MIYAISHI , Masahiro OKUBO , Masayuki YOSHIMURA , Wataru SAKANE , Teppei TANAKA , Saeko NAKAMURA , Saori YAMAKI
Abstract: A corrosion-resistant member including: 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 having the highest mass content ratio among elements contained in the base material (10) and a trace 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.
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公开(公告)号：US20220243072A1
公开(公告)日：2022-08-04
申请号：US17612871
申请日：2021-02-24
Applicant: SHOWA DENKO K.K.
Inventor： So MIYAISHI , Masahiro OKUBO , Masayuki YOSHIMURA , Wataru SAKANE , Teppei TANAKA , Saeko NAKAMURA , Saori YAMAKI
Abstract: A corrosion-resistant member including: a metal base material (10); and a corrosion-resistant coating (30) formed on the surface of the base material (10). The corrosion-resistant coating (30) is a stack of a magnesium fluoride layer (31) and an aluminum fluoride layer (32) in order from the base material (10) side. The aluminum fluoride layer (32) has a first crystalline region (32A) and a second crystalline region (32B) containing crystalline aluminum fluoride. The first crystalline region (32A) is a region in which diffraction spot arrays having regularity are observed in an electron beam diffraction image obtained by irradiation with electron beams having a beam diameter of 10 nm to 20 nm. The second crystalline region (32B) is a region in which a plurality of diffraction spots is observed but diffraction spot arrays having regularity are not observed in an electron beam diffraction image obtained by irradiation with the above-described electron beams.
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Patent Agency Ranking
公开(公告)号：US20200308056A1
公开(公告)日：2020-10-01
申请号：US16768231
申请日：2018-12-25
Applicant: SHOWA DENKO K.K.
Inventor： So MIYAISHI , Satoshi IINOU
Abstract: A precursor of an alumina sintered compact including aluminum, yttrium, and at least one metal selected from iron, zinc, cobalt, manganese, copper, niobium, antimony, tungsten, silver, and gallium. The aluminum content is 98.0% by mass or more as an oxide (Al2O3) in 100% by mass of the precursor of an alumina sintered compact; the yttrium content is 0.01 to 1.35 parts by mass as an oxide (Y2O3) based on 100 parts by mass of the content of the aluminum as an oxide; the total content of the metals selected from the foregoing group is 0.02 to 1.55 parts by mass as an oxide based on 100 parts by mass of the content of aluminum as an oxide; and the aluminum is contained as α-alumina. Also disclosed is an alumina sintered compact, and a method for producing an alumina sintered compact and for producing abrasive grains.
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6.发明申请公开(公告)号：US20200239369A1
公开(公告)日：2020-07-30
申请号：US16649758
申请日：2018-10-25
Applicant: SHOWA DENKO K.K
Inventor： So MIYAISHI , Kazuaki TAKANO , Satoshi YAMAOKA
IPC: C04B35/106 , C09K3/14
Abstract: Provided are electrofused alumina grains capable of preventing grain binding on production and of achieving high grinding performance. The electrofused alumina grains of the present invention contain at least either one of tungsten or molybdenum.
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公开(公告)号：US20230235183A1
公开(公告)日：2023-07-27
申请号：US18011372
申请日：2021-06-21
Applicant: SHOWA DENKO K.K.
Inventor： So MIYAISHI , Masahiro OKUBO , Masayuki YOSHIMURA , Wataru SAKANE , Teppei TANAKA , Saeko NAKAMURA , Takuya IMAI , Tetsuo SAKURAI , Koyuki MESUDA
Abstract: There is provided a corrosion-resistant member in which a corrosion-resistant coating film is less likely to peel off from a base material even when the corrosion-resistant member is subjected to a thermal history. The corrosion-resistant member includes: a base material (10) containing aluminum or an aluminum alloy; and a corrosion-resistant coating film (20) formed on the surface of the base material (10), in which the corrosion-resistant coating film (20) contains aluminum fluoride hydroxide AlF3−x(OH)x in which a space group belongs to R-3c, and x in the chemical formula is 0.05 or more and 1.00 or less.
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公开(公告)号：US20200339849A1
公开(公告)日：2020-10-29
申请号：US16756971
申请日：2018-12-19
Applicant: SHOWA DENKO K.K.
Inventor： So MIYAISHI
IPC: C09K3/14 , C04B35/111 , B24D5/02
Abstract: 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.
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9.发明申请公开(公告)号：US20190284462A1
公开(公告)日：2019-09-19
申请号：US16302145
申请日：2017-06-22
Applicant: SHOWA DENKO K.K.
Inventor： Satoshi YAMAOKA , So MIYAISHI , Shinichiro TOMIKAWA
IPC: C09K3/14
Abstract: 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.
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