Abstract: A centrifugal casting apparatus includes a mold holder placed on a freely rotatable rotary table, and a mold put into and held by the mold holder. The mold holder includes a mold holder body made of a metal material and having a bottomed cylindrical shape, heat insulation members provided on an inner peripheral surface and a bottom surface of the mold holder body, and mold positioning members each made of a ceramic and provided to protrude from the heat insulation member on the bottom surface of the mold holder body. The mold includes a mold body having a cavity into which a molten metal is to be poured, and a mold base provided to the mold body and having mold positioning member insertion holes engageable with the mold positioning members.

Abstract: A Ni-based single crystal superalloy which has the following composition: Co: 4.0 to 9.5 wt %, Cr: 5.1 to 8.0 wt %, Mo: 2.1 to 3.5 wt %, W: 0.0 to 2.9 wt %, Ta: 4.0 to 10.0 wt %, Al: 4.5 to 6.5 wt %, Ti: 0.0 to 1.0 wt %, Hf: 0.08 to 0.5 wt %, Nb: 0.0 to 3.0 wt %, Re: 4.5 to 8.0 wt % and Ru: 0.5 to 6.5 wt % with the remainder including Ni and unavoidable impurities, wherein P1?700 is satisfied in which P1 represents a parameter 1, which is obtained by a formula: P1=137×[W (wt %)]+24×[Cr (wt %)]+46×[Mo (wt %)]?18×[Re (wt %)].

Abstract: A Ni-based single crystal superalloy which has the following composition: Co: 4.0 to 9.5 wt %, Cr: 5.1 to 8.0 wt %, Mo: 2.1 to 3.5 wt %, W: 0.0 to 2.9 wt %, Ta: 4.0 to 10.0 wt %, Al: 4.5 to 6.5 wt %, Ti: 0.0 to 1.0 wt %, Hf: 0.08 to 0.5 wt %, Nb: 0.0 to 3.0 wt %, Re: 4.5 to 8.0 wt % and Ru: 0.5 to 6.5 wt % with the remainder including Ni and unavoidable impurities, wherein P1?700 is satisfied in which P1 represents a parameter 1, which is obtained by a formula: P1=137×[W(wt %)]+24×[Cr(wt %)]+46×[Mo(wt %)]?18×[Re(wt %)].

Abstract: A centrifugal casting apparatus includes a mold holder placed on a freely rotatable rotary table, and a mold put into and held by the mold holder. The mold holder includes a mold holder body made of a metal material and having a bottomed cylindrical shape, heat insulation members provided on an inner peripheral surface and a bottom surface of the mold holder body, and mold positioning members each made of a ceramic and provided to protrude from the heat insulation member on the bottom surface of the mold holder body. The mold includes a mold body having a cavity into which a molten metal is to be poured, and a mold base provided to the mold body and having mold positioning member insertion holes engageable with the mold positioning members.

Abstract: A Ni-based single crystal superalloy which has the following composition: Co: 0.0 wt % or more to 15.0 wt % or less, Cr: 4.1 to 8.0 wt %, Mo: 2.1 to 4.5 wt %, W: 0.0 to 3.9 wt %, Ta: 4.0 to 10.0 wt %, Al: 4.5 to 6.5 wt %, Ti: 0.0 to 1.0 wt %, Hf: 0.00 to 0.5 wt %, Nb: 0.0 to 3.0 wt %, Re: 8.1 to 9.9 wt % and Ru: 0.5 to 6.5 wt % with the remainder including Ni and unavoidable impurities. As a result, the Ni-based single crystal superalloy which includes more than 8 wt % of Re in the composition ratio and has excellent specific creep strength and the turbine blade incorporating the Ni-based single crystal superalloy may be made.

Abstract: A Ni-based single crystal superalloy according to the invention has, for example, a composition including: 5.0 to 7.0 wt % of Al, 4.0 to 10.0 wt % of Ta, 1.1 to 4.5 wt % of Mo, 4.0 to 10.0 wt % of W, 3.1 to 8.0 wt % of Re, 0.0 to 2.0 wt % of Hf, 2.5 to 8.5 wt % of Cr, 0.0 to 9.9 wt % of Co, 0.0 to 4.0 wt % of Nb, and 1.0 to 14.0 wt % of Ru in terms of weight ratio; and the remainder including Ni and incidental impurities. In addition, the contents of Cr, Hf and Al are preferably set so as to satisfy the equation OP?108. According to the Ni-based single crystal superalloy of the invention, high creep strength can be maintained and the oxidation resistance can be improved.

Abstract: A Ni-based single crystal superalloy which has the following composition: Co: 0.0 wt % or more to 15.0 wt % or less, Cr: 4.1 to 8.0 wt %, Mo: 2.1 to 4.5 wt %, W: 0.0 to 3.9 wt %, Ta: 4.0 to 10.0 wt %, Al: 4.5 to 6.5 wt %, Ti: 0.0 to 1.0 wt %, Hf: 0.00 to 0.5 wt %, Nb: 0.0 to 3.0 wt %, Re: 8.1 to 9.9 wt % and Ru: 0.5 to 6.5 wt % with the remainder including Ni and unavoidable impurities. As a result, the Ni-based single crystal superalloy which includes more than 8 wt % of Re in the composition ratio and has excellent specific creep strength and the turbine blade incorporating the Ni-based single crystal superalloy may be made.

Abstract: The object of the present invention is to provide a mold which has low reactivity with molten alloys and which is inexpensive, a method for manufacturing the same and a molded article using the mold. A mold 40 in accordance with the present invention serves for manufacturing a molded article 60 of a titanium-aluminum alloy or a titanium alloy. At least an initial layer 44a of a cavity surface 43 of a mold body 41 constituting the mold 40 is formed of a calcined product of a slurry comprising a filler having cerium oxide as a main component and a binder having silica sol as a main component.

Abstract: A Ni-based single crystal superalloy according to the invention has, for example, a composition including: 5.0 to 7.0 wt % of Al, 4.0 to 10.0 wt % of Ta, 1.1 to 4.5 wt % of Mo, 4.0 to 10.0 wt % of W, 3.1 to 8.0 wt % of Re, 0.0 to 2.0 wt % of Hf, 2.5 to 8.5 wt % of Cr, 0.0 to 9.9 wt % of Co, 0.0 to 4.0 wt % of Nb, and 1.0 to 14.0 wt % of Ru in terms of weight ratio; and the remainder including Ni and incidental impurities. In addition, the contents of Cr, Hf and Al are preferably set so as to satisfy the equation OP?108. According to the Ni-based single crystal superalloy of the invention, high creep strength can be maintained and the oxidation resistance can be improved.

Abstract: A Ni-based single crystal superalloy which has the following composition: Co: 0.0 wt % or more to 15.0 wt % or less, Cr: 4.1 to 8.0 wt %, Mo: 2.1 to 6.5 wt %, W: 0.0 to 3.9 wt %, Ta: 4.0 to 10.0 wt %, Al: 4.5 to 6.5 wt %, Ti: 0.0 to 1.0 wt %, Hf: 0.00 to 0.5 wt %, Nb: 0.0 to 3.0 wt %, Re: 3.0 to 8.0 wt % and Ru: 0.5 to 6.5 wt % with the remainder including Ni and unavoidable impurities, wherein P1?700 is satisfied in which P1 represents a parameter 1, which is obtained by a formula: P1=137×[W (wt %)]+24×[Cr (wt %)]+46×[Mo (wt %)]?18×[Re (wt %)]. The Ni-based single crystal superalloy has excellent specific creep strength.

Abstract: The present invention is characterized in including Al: more than 5 at % to 13 at % or less; V: 3 at % or more to 9.5 at % or less; and Ti: 0 at % or more to 3.5 at % or less, with the remainder being Ni and unavoidable impurities, and having a multi-phase microstructure including a primary L12 phase and an (L12 phase+D022 phase and/or D024 and/or D0a phase) eutectoid microstructure.

Abstract: The object of the present invention is to provide a mold which has low reactivity with molten alloys and which is inexpensive, a method for manufacturing the same and a molded article using the mold. A mold 40 in accordance with the present invention serves for manufacturing a molded article 60 of a titanium-aluminum alloy or a titanium alloy. At least an initial layer 44a of a cavity surface 43 of a mold body 41 constituting the mold 40 is formed of a calcined product of a slurry comprising a filler having cerium oxide as a main component and a binder having silica sol as a main component.

Abstract: A mold having a shell and a porous layer formed on the surface of the cavity of the shell. The mold can be suitably used for manufacturing a porous body having a porous layer on the surface thereof. The method for manufacturing the mold, includes the steps of forming a layer of combustible powdery particles around a wax mold, which is a lost pattern, a step of forming a film of a ceramic precursor slurry around the wax mold having powdery particles formed thereon, a step of subjecting the resultant product to a heat treatment, to thereby dewax the wax mold, and a step of firing the slurry film, to thereby burn and vanish the powdery particles in the slurry film and form a shell.

Abstract: A cast article includes a porous layer having a three-dimensional porous structure, and is manufactured utilizing a mold manufactured by: scattering and adhering combustible powdery particles around a wax mold, which is a lost pattern, to form a layer of combustible powdery particles around the wax mold; coating a film of a ceramic precursor slurry around the wax mold; subjecting the wax mold coated with the slurry film to a heat treatment at 100 to 180° C., to dewax only the wax mold without the combustible powdery particles; and burning and vanishing and firing the slurry film, to burn and vanish the powdery particles in the slurry film and form a shell. Casting the cast article by: pouring a molten metal into the cavity of the mold; cooling the molten metal; and removing the shell of the mold.

Abstract: A mold having a shell and a porous layer formed on the surface of the cavity of the shell. The mold can be suitably used for manufacturing a porous body having a porous layer on the surface thereof. The method for manufacturing the mold, includes the steps of forming a layer of combustible powdery particles around a wax mold, which is a lost pattern, a step of forming a film of a ceramic precursor slurry around the wax mold having powdery particles formed thereon, a step of subjecting the resultant product to a heat treatment, to thereby dewax the wax mold, and a step of firing the slurry film, to thereby burn and vanish the powdery particles in the slurry film and form a shell.

Abstract: A method for manufacturing a mold (70), which comprises a step of forming a layer (31) of combustible powdery particles (32) around a wax mold (21), which is a lost pattern, a step of forming a film (51) of a ceramic precursor slurry (52) around the wax mold (21) having powdery particles (32) formed thereon, a step of subjecting the resultant product to a heat treatment, to thereby dewax the wax mold (21), and a step of firing the slurry film (51), to thereby burn and vanish the powdery particles (32) in the slurry film (51) and form a shell (71). The mold (70) has the shell (71) and a porous layer (74) formed on the surface (76) of the cavity of the shell. The mold can be suitably used for manufacturing a porous body (90) having a porous layer (94) on the surface thereof.

Abstract: A method for manufacturing a mold (70), which comprises a step of forming a layer (31) of combustible powdery particles (32) around a wax mold (21), which is a lost pattern, a step of forming a film (51) of a ceramic precursor slurry (52) around the wax mold (21) having powdery particles (32) formed thereon, a step of subjecting the resultant product to a heat treatment, to thereby dewax the wax mold (21), and a step of firing the slurry film (51), to thereby burn and vanish the powdery particles (32) in the slurry film (51) and form a shell (71). The mold (70) has the shell (71) and a porous layer (74) formed on the surface (76) of the cavity of the shell. The mold can be suitably used for manufacturing a porous body (90) having a porous layer (94) on the surface thereof.

Abstract: A Ni-based single crystal super alloy capable of improving strength by preventing precipitation of a TCP phase at high temperatures may be obtained by a Ni-based single crystal super alloy having a composition consisting of 5.0-7.0 wt % Al, 4.0-8.0 wt % Ta, 2.9-4.5 wt % Mo, 4.0-8.0 wt % W, 3.0-6.0 wt % Re, 0.01-0.50 wt % Hf, 2.0-5.0 wt % Cr, 0.1-15.0 wt % Co and 1.0-4.0 wt % Ru in terms of its weight ratio, with the remainder consisting of Ni and unavoidable impurities. Preferably, the composition of Co in the Ni-based single crystal super alloy is limited to 0.1-9.5 wt %.

Abstract: A Ni-based single crystal super alloy capable of improving strength by preventing precipitation of a TCP phase at high temperatures may be obtained by a Ni-based single crystal super alloy having a composition consisting of 5.0-7.0 wt % Al, 4.0-8.0 wt % Ta, 2.9-4.5 wt % Mo, 4.0-8.0 wt % W, 3.0-6.0 wt % Re, 0.01-0.50 wt % Hf, 2.0-5.0 wt % Cr, 0.1-15.0 wt % Co and 1.0-4.0 wt % Ru in terms of its weight ratio, with the remainder consisting of Ni and unavoidable impurities. Preferably, the composition of Co in the Ni-based single crystal super alloy is limited to 0.1-9.5 wt %.

Abstract: A method of manufacturing a heat-resistant ceramic core with a three-dimensional shape, which is used to cast a hollow flow passage inside by precision casting. The method includes a powder lamination shaping step for forming ceramic core 2 with a three-dimensional shape from resin-covered ceramic powder 1, an impregnation step for impregnating ceramics reinforcing liquid 3 into the formed ceramic core 2, and a sintering step for sintering the impregnated ceramic core 2 to improve the heat resistance thereof.