Takumi Umada has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
Abstract: A target replacement apparatus for use in replacement of a sputtering target, the sputtering target being used to carry out surface treatment by a physical vapor deposition method on a material to be surface-treated that is situated in a reduced pressure space of a chamber, the target replacement apparatus includes a target retaining portion retaining the sputtering target; an attachment and detachment mechanism used to detachably attach the target retaining portion to the chamber at a position where the sputtering target faces the material to be surface-treated that is situated in the reduced pressure space; and an isolating mechanism operable to isolate the target retaining portion attached to the chamber from the reduced pressure space in an openable and closable manner.
Abstract: Provided is a surface treatment facility in which both surfaces of a material subjected to coating are subjected to continuous film deposition by PVD as the material is conveyed in the longitudinal direction, wherein flutter of the material subjected to coating can be suppressed. This surface treatment facility: has a chamber and continuously deposits a film by PVD on both surfaces of a material subjected to coating as the material is conveyed in the longitudinal direction through the chamber; is further provided with a conveyance mechanism for conveying the material subjected to coating and a blowing mechanism for blowing film-forming gas in the longitudinal direction on both sides of the material subjected to coating present in the chamber; and has an X/Y ratio within a range of 0.4 to 3.0 where X is the film-forming gas blowing speed, where the unit of measurement is m/min, and Y is the conveyance speed of the material subjected to coating, where the unit of measurement is m/min.
Abstract: A grain-oriented electromagnetic steel sheet exhibits excellent magnetic characteristics and excellent coating film adhesion after strain relieving annealing. The grain-oriented electromagnetic steel sheet includes: a steel sheet; a coating film layer A that is a ceramic coating film which is formed on the steel sheet and has an oxide content of less than 30% by mass; and a coating film layer B that is an insulating tension coating film which is arranged on the coating film layer A and contains an oxide. The binding energy of the 1s orbital of oxygen in the coating film layer B is higher than 530 eV; and tension applied to the steel sheet by the coating film layer B per a thickness of 1.0 ?m of the coating film layer B is 4.0 MPa/?m or more.
Abstract: Provided are: a grain-oriented electromagnetic steel sheet exhibiting excellent coating film adhesion and excellent magnetic characteristics; and a method for producing this grain-oriented electromagnetic steel sheet. This grain-oriented electromagnetic steel sheet is provided with a ceramic coating film arranged on a steel sheet, and an oxide insulating tension coating film arranged on the ceramic coating film. The ceramic coating film contains a nitride and an oxide; the nitride contains at least one element selected from the group consisting of Cr, Ti, Zr, Mo, Nb, Si, Al, Ta, Hf, W and Y; and the oxide has a corundum crystal structure. The Young's modulus of the ceramic coating film as determined by a nanoindentation method is 230 GPa or more; the average film thickness of the ceramic coating film is from 0.01 ?m to 0.30 ?m (inclusive); and the tension of the oxide insulating tension coating film is 10 MPa or more.
Abstract: In a grain-oriented electrical steel sheet, comprising magnetic domains refined by a plurality of linear grooves in a surface of a steel sheet, each of the linear grooves is provided on its floor with a plurality of recessed parts aligned in a direction in which the linear groove extends, at a predetermined interval p (?m), and the recessed part is made to have a predetermined depth d (?m). In this way, it is possible to provide a grain-oriented electrical steel sheet having further improved iron loss properties while having reduced magnetic flux density reduction.
Abstract: Provided are: a grain-oriented electrical steel sheet that has an excellent magnetic property and coating adhesiveness after stress relief annealing; and a production method therefor. This grain-oriented electrical steel sheet has: a steel sheet; a metal coating which contains a metal element and which is disposed on the steel sheet; a coating layer A which is a ceramic coating having an oxide content of less than 30 mass % and which is disposed on the metal coating; and a coating layer B which is an insulating tensile coating containing an oxide and which is disposed on the coating layer A, wherein the metal coating has a thickness of 1.0-10.0 nm, and in the metal element, the atomic radius ratio represented by formula (1) is at least 10%, when the atomic radius of iron is defined as RFe and the atomic radius of the metal element as RA. (|RFe?RA|/RFe)×100.
Abstract: Provided are: a grain-oriented electrical steel sheet that has excellent coating adhesiveness and an excellent magnetic property after stress relief annealing; and a production method for therefor. The grain-oriented electrical steel sheet has: a steel sheet; a coating layer A which is a ceramic coating having an oxide content of less than 30 mass % and which is disposed on the steel sheet; and a coating layer B which is an insulating tensile coating containing an oxide and which is disposed on the coating layer A. When a Gaussian fitting is performed on a 31P-NMR spectrum of the coating layer B within the range of 0 to ?60 ppm, the proportion of a peak area of ?17 to ?33 ppm to the total peak area is 30% or more.
Abstract: Provided are: an oriented electromagnetic steel sheet with outstanding coating adhesion and magnetic properties after stress relief annealing; and a method for manufacturing the oriented electromagnetic steel sheet. The oriented electromagnetic steel sheet comprises: a steel sheet; a non-oxide ceramic coating disposed on the steel sheet and containing a non-oxide; and an insulating tensile coating disposed on the non-oxide ceramic coating and containing an oxide. The thickness of the non-oxide ceramic coating is 0.020-0.400 ?m. The thickness of the insulating tensile coating is at least 1.0 ?m. The chromium content on the steel plate side of the non-oxide ceramic coating is less than 25 atomic %, and the chromium content on the insulating tensile coating side of the non-oxide ceramic coating is at least 25 atomic %.