Mold and manufacturing method thereof, and molded article using the mold

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 44 a 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.

1 . A method for manufacturing a mold for manufacturing a molded article of a titanium-aluminum alloy or a titanium alloy, comprising:
 a step of forming an initial layer slurry film by applying an initial layer slurry comprising a filler having cerium oxide as a main component and a binder having silica sol as a main component to a surface of a wax mold that is an evaporative pattern mold, and by drying thereof;   a step of successively forming slurry films of second and subsequent layers on a surface of the initial layer slurry film;   a step of forming a mold precursor having a cavity inside the initial layer slurry film by performing a wax removal treatment with respect to the wax mold that has been coated with at least two slurry films; and   a step of forming a shell mold by performing a calcination treatment with respect to the mold precursor to solidify each slurry film.   
   
   
       2 . The method for manufacturing a mold according to  claim 1 , wherein the step of forming the initial layer slurry film is repeated again as a step for forming the second slurry film. 
   
   
       3 . A method for manufacturing a mold for manufacturing a molded article of a titanium-aluminum alloy or a titanium alloy, comprising:
 a step of forming a block body of an initial layer slurry by applying the initial layer slurry comprising a filler having cerium oxide as a main component and a binder having silica sol as a main component to a surface of a wax mold that is an evaporative pattern mold, and by drying thereof;   a step of forming a mold precursor having a cavity inside the block body by performing a wax removal treatment with respect to the wax mold having the block body; and   a step of forming a solid mold by performing a calcination treatment with respect to the mold precursor to solidify the block body.   
   
   
       4 . A method for manufacturing a mold for manufacturing a molded article of a titanium-aluminum alloy or a titanium alloy, comprising:
 a step of forming an initial layer slurry film by applying an initial layer slurry comprising a filler having cerium oxide as a main component and a binder having silica sol as a main component to a surface of a wax mold that is an evaporative pattern mold, and by drying;   a step of forming a block body of a last layer slurry around the initial layer slurry film;   a step of forming a mold precursor having a cavity inside the initial layer slurry film by performing a wax removal treatment with respect to the wax mold that has the initial layer slurry film and the block body; and   a step of forming a solid mold by performing a calcination treatment with respect to the mold precursor to solidify the initial layer slurry film and the block body.   
   
   
       5 . The method for manufacturing a mold according to  claim 4 , wherein the step of forming the initial layer slurry film is repeated again after the step of forming the initial layer slurry film to form the block body of the last layer slurry around the initial layer slurry film having a two-layer structure.