Abstract: A rare earth aluminate sintered compact including rare earth aluminate phosphor crystalline phases and voids, wherein an absolute maximum length of 90% or more by number of rare earth aluminate phosphor crystalline phases is in a range from 0.4 ?m to 1.3 ?m, and an absolute maximum length of 90% or more by number of voids is in a range from 0.1 ?m to 1.2 ?m.

Abstract: Provided is a galvanized steel sheet having a TS of 980 MPa or more, high YS, excellent ductility, strain hardenability, and hole expansion formability. A base steel sheet has a defined chemical composition and a steel microstructure as follows: area ratio of ferrite: 65.0% or less (including 0%), area ratio of bainitic ferrite: 5.0% or more and 40.0% or less, area ratio of tempered martensite: 0.5% or more and 80.0% or less, area ratio of retained austenite: 3.0% or more, area ratio of fresh martensite: 20.0% or less (including 0%), SBF+STM+2×SMA: 65.0% or more, SMA1/SMA: 0.80 or less, and SMA2/SMA: 0.20 or more.

Abstract: Disclosed is an Fe-based electroplated steel sheet including: a Si-containing cold-rolled steel sheet containing Si in an amount of 0.1 mass % or more and 3.0 mass % or less; and an Fe-based electroplating layer formed on at least one surface of the Si-containing cold-rolled steel sheet with a coating weight per surface of 5.0 g/m2 or more, in which in an intensity profile measured by glow discharge optical emission spectrometry, a peak of emission intensity at wavelengths indicating Si is detected within a range from a surface of the Fe-based electroplating layer to more than 0.2 ?m in a thickness direction and not more than a thickness of the Fe-based electroplating layer, and an average value of C concentration in a region ranging from 10 ?m to 20 ?m in the thickness direction from the surface of the Fe-based electroplating layer is 0.10 mass % or less.

Abstract: Provided is a hard particle powder for a sintered body, consisting of: 0.01?C?3.5 mass %, 0.5?Si?4.0 mass %, 0.1?Mn?10.0 mass %, 0.1?Ni?35.0 mass %, 0.1?Cr?40.0 mass %, 5.0?Mo?50.0 mass %, 0.1?Fe?30.0 mass %, and 0.01?REM?0.5 mass %, with a balance being Co and inevitable impurities.

Abstract: The present invention relates to a powder for sintering containing a mixture of a metal powder and metal oxide particles having an average particle diameter of 5 nm or more and 200 nm or less, and to a sintered body.

Abstract: The invention provides a hard-particle powder for sintered body, which contains, by mass %, 2% to 3.5% of Si, 6% to 10% of Cr, 20% to 35% of Mo, 0.01% to 0.5% of REM, and the remainder being Co and unavoidable impurities. The invention further provides a sintered body obtained through a mixing step of mixing the above-mentioned hard-particle powder for sintered body with a pure iron powder and a graphite powder to obtain a powder mixture, a forming step of compacting the powder mixture to obtain a compact, and a sintering step of sintering the compact. The hard-particle powder according to the invention has the effect of giving a sintered body having improved wear resistance without substantially impairing powder characteristics and sintering characteristics. Additionally, the sintered body according to the invention has the effect of having excellent wear resistance.

Abstract: The permanent magnet member 10 for a voice coil motor (VCM) in accordance with the present invention comprises a magnet body 1 including a shorter periphery 11, a longer periphery 12 located at a position separated from the shorter periphery 11 by a predetermined distance, and a pair of side peripheries 13, 14 connecting the shorter periphery 11 and longer periphery 12 to each other, the magnet body having a fan-shaped planar form; and a corrosion-resistant film (Ni plating film 2) applied to a surface of the magnet body. The permanent magnet member 10 has a thickness whose maximum and minimum values yield a difference of 10 to 150 ?m therebetween.

Abstract: The permanent magnet member 10 for a voice coil motor (VCM) in accordance with the present invention comprises a magnet body 1 including a shorter periphery 11, a longer periphery 12 located at a position separated from the shorter periphery 11 by a predetermined distance, and a pair of side peripheries 13, 14 connecting the shorter periphery 11 and longer periphery 12 to each other, the magnet body having a fan-shaped planar form; and a corrosion-resistant film (Ni plating film 2) applied to a surface of the magnet body. The permanent magnet member 10 has a thickness whose maximum and minimum values yield a difference of 10 to 150 ?m therebetween.

Abstract: A magnet body 1 including a shorter periphery 11, a longer periphery 12 located at a position separated from the shorter periphery 11 by a predetermined distance, and a pair of side peripheries 13, 14 connecting the shorter periphery 11 and longer periphery 12 to each other, the magnet body having a fan-shaped planar form; and a corrosion-resistant film (Ni plating film 2) applied to a surface of the magnet body. The permanent magnet member 10 has a thickness whose maximum and minimum values yield a difference of 10 to 150 ?m therebetween.

Abstract: The invention provides a hard-particle powder for sintered body, which contains, by mass %, 2% to 3.5% of Si, 6% to 10% of Cr, 20% to 35% of Mo, 0.01% to 0.5% of REM, and the remainder being Co and unavoidable impurities. The invention further provides a sintered body obtained through a mixing step of mixing the above-mentioned hard-particle powder for sintered body with a pure iron powder and a graphite powder to obtain a powder mixture, a forming step of compacting the powder mixture to obtain a compact, and a sintering step of sintering the compact. The hard-particle powder according to the invention has the effect of giving a sintered body having improved wear resistance without substantially impairing powder characteristics and sintering characteristics. Additionally, the sintered body according to the invention has the effect of having excellent wear resistance.

Abstract: Provided are a method of manufacturing a rare-earth magnet with superior corrosion resistance, and a plating bath used for the method. A first protective film including nickel and a second protective film including nickel and sulfur are laminated in order on a magnet body including a rare-earth element. The first protective film is formed through electroplating with a first plating bath including a nickel source, a conductive salt and a pH stabilizer, and having a concentration of the nickel source of 0.3 mol/l to 0.7 mol/l on a nickel atom basis and a conductivity of 80 mS/cm or over. Thereby, a rare-earth-rich phase can be prevented from being leached out, and the production of pinholes can be reduced. Therefore, the corrosion resistance of the rare-earth magnet can be improved.

Abstract: An R-T-B system permanent magnet 1 comprises a magnet body 2 comprising a sintered body comprising at least a main phase comprising R2T14B grains (wherein R represents one or more rare earth elements, and T represents one or more transition metal elements including Fe or Fe and Co essentially) and a grain boundary phase containing R in a larger amount than the main phase, the magnet body 2 having a 300 ?m or less thick (not inclusive of zero thick) hydrogen-rich layer 21 having a hydrogen concentration of 300 ppm or more formed in the surface layer portion, and an overcoat 3 covering the surface of the magnet body 2 can improve the corrosion resistance of the R-T-B system permanent magnet 1 with an overcoat 3 formed thereon without degrading the magnetic properties thereof.

Abstract: An R-T-B system permanent magnet 1 comprises a magnet body 2 comprising a sintered body comprising at least a main phase comprising R2T14B grains (wherein R represents one or more rare earth elements, and T represents one or more transition metal elements including Fe or Fe and Co essentially) and a grain boundary phase containing R in a larger amount than the main phase, the magnet body 2 having a 300 ?m or less thick (not inclusive of zero thick) hydrogen-rich layer 21 having a hydrogen concentration of 300 ppm or more formed in the surface layer portion, and an overcoat 3 covering the surface of the magnet body 2 can improve the corrosion resistance of the R-T-B system permanent magnet 1 with an overcoat 3 formed thereon without degrading the magnetic properties thereof.

Abstract: The permanent magnet member 10 for a voice coil motor (VCM) in accordance with the present invention comprises a magnet body 1 including a shorter periphery 11, a longer periphery 12 located at a position separated from the shorter periphery 11 by a predetermined distance, and a pair of side peripheries 13, 14 connecting the shorter periphery 11 and longer periphery 12 to each other, the magnet body having a fan-shaped planar form; and a corrosion-resistant film (Ni plating film 2) applied to a surface of the magnet body. The permanent magnet member 10 has a thickness whose maximum and minimum values yield a difference of 10 to 150 ?m therebetween.

Abstract: Provided are a method of manufacturing a rare-earth magnet with superior corrosion resistance, and a plating bath used for the method. A first protective film including nickel and a second protective film including nickel and sulfur are laminated in order on a magnet body including a rare-earth element. The first protective film is formed through electroplating with a first plating bath including a nickel source, a conductive salt and a pH stabilizer, and having a concentration of the nickel source of 0.3 mol/l to 0.7 mol/l on a nickel atom basis and a conductivity of 80 mS/cm or over. Thereby, a rare-earth-rich phase can be prevented from being leached out, and the production of pinholes can be reduced. Therefore, the corrosion resistance of the rare-earth magnet can be improved.

Abstract: An object of the invention is to provide an inexpensive magnet having a high coercivity, high squareness ratio and high maximum energy product. According to the invention, a magnet containing R, T, N, and M wherein R is at least one rare earth element with essential samarium, T is iron or iron and cobalt, and M is at least one element of Ti, V, Cr, Nb, Hf, Ta, Mo, W, Al, C, and P, with essential zirconium, in amounts of 4-8 at % of R, 10-20 at % of N, 2-10 at % of M, and having a hard magnetic phase (TbCu.sub.7 type crystalline phase) and a soft magnetic phase (which is a bcc structured T phase, has an average grain diameter of 5-60 nm, and accounts for 10 to 60% by volume of the entirety), the atomic ratio (R+M)/(R+T+M) in the hard magnetic phase being in excess of 12.5%, is prepared utilizing a single roll technique. In the single roll technique, the peripheral speed of a chill roll is at least 50 m/s, and the discharge pressure of the molten alloy is 0.3-2 kgf/cm.sup.2.

Abstract: A process for producing a thin film magnetic head comprises a first step of forming a magnetic layer 20 on the surface of a gap spacer layer 9, a second step of forming on the surface of the magnetic layer 20 a lower resist layer 21 shaped to have a smaller width than an upper core layer 11 when seen from above and forming on the resist layer 21 an upper resist layer 22 projecting outward beyond opposite side faces of the resist layer 21 and shaped in conformity with the shape of the upper core layer 11 when seen from above, a third step of shaping the magnetic layer 20 into the upper core layer 11 by ion beam-etching the magnetic layer 20, and a fourth step of removing the lower resist layer 21 and the upper resist layer 22.

Abstract: A magnet consists essentially of 4-8 at % of R, 10-20 at % of N, 2-10 at % of M, and the balance of T wherein R is at least one rare earth element, Sm being present in R in a proportion of at least 50 at %, T is Fe or Fe and Co, M is Zr with or without partial replacement by at least one element of Ti, V, Cr, Nb, Hf, Ta, Mo, W, Al, C, and P. Contained in the magnet are a hard magnetic phase based on R, T, and N and containing at least one crystalline phase selected from TbCu.sub.7, Th.sub.2 Zn.sub.17, and Th.sub.2 Ni.sub.17 types and a soft magnetic phase consisting of a T phase having a bcc structure, the soft magnetic phase having a mean grain size of 5-60 nm and being present in a proportion of 10-60% by volume. This construction ensures high coercivity, high squareness ratio, and high maximum energy product.

Abstract: A thin film head of the floating type includes a head slider 1 having a surface to be opposed to the signal face of a recording medium with a small space formed therebetween. At least one head element 2 is formed by thin film forming techniques on a face of the head slider 1 orthogonal to the slider surface. A protective layer 3 is formed over the head slider face and covers the head element 2. The head slider 1 has a pair of side faces orthogonal to the slider surface to be opposed to the medium and extending in parallel to each other respectively at opposite sides of the head element 2. The protective layer 3 is formed at each of its opposite side portions with a bulging-out curved face R smoothly extending from the surface of the protective layer 3 to the side face of the head slider 1.

Abstract: A thin film magnetic head comprising a lower magnetic core layer 9 and an upper magnetic core layer 12 formed over the core layer 9 with a coil layer 10, a gap spacer layer 11 and an insulating layer provided therebetween, the core layers 9 and 12 each having a core tip region c between a core tip a and a portion b increasing in core width. The core layers 9 and 12 are each formed by a magnetic thin film of NiFe having a positive magnetostriction constant of not greater than 1.times.10.sup.-6 in absolute value and containing 17.5 to 19.5 wt. % of Fe.