Casting investment composition and casting process using same

Patent metadata

Field	Value
Publication number	US-9718121-B2
Application number	US-201314403805-A
Country	US
Kind code	B2
Filing date	Jun 17, 2013
Priority date	Jun 18, 2012
Publication date	Aug 1, 2017
Grant date	Aug 1, 2017

Abstract

The object of the present invention is to provide an embedding material composition for casting that makes it possible to conduct a favorable casting in the case where casting is conducted using a resin pattern that is different from a conventional wax pattern in disappearance temperature and disappearance behaviors through “rapid heating” excellent in treatment efficiency. The present invention relates to an embedding material composition for casting not using a heat-expandable refractory material as a main component, comprising: a binder; and a non-heat-expandable refractory material having an average particle diameter of 5 to 20 μm as main components, in which a content of the binder is 25 to 40 parts by mass and a content of the non-heat-expandable refractory material is 60 to 75 parts by mass in the case where the total amount of the main components is 100 parts by mass, and the present invention also relates to a casting process using the embedding material composition for casting.

First claim

The invention claimed is:

1. An embedding material composition for casting not using a heat-expandable refractory material as a main component, comprising:
a binder; and
a non-heat-expandable refractory material having an average particle diameter in a range from 5 to 20 μm, as main components,
wherein the binder is calcined gypsum or a mixture of magnesium oxide and ammonium primary phosphate,
the non-heat-expandable refractory material is one or more materials selected from the group consisting of fused silica, mullite, and zircon,
a content of the binder is in a range from 25 to 40 parts by mass,
a content of the non-heat-expandable refractory material is in a range from 60 to 75 parts by mass relative to a total amount of the main components as 100 parts by mass, and
the main components in the composition consist of the binder and the non-heat-expandable refractory material, where the main component in the composition is a component included in the composition in an amount of 5 parts by mass or more relative to the composition as 100 parts by mass.

2. The embedding material composition for casting according to claim 1 ,
wherein the content of the binder is in a range from 25 to 35 parts by mass, and
the content of the non-heat-expandable refractory material is in a range from 65 to 75 parts by mass.

3. The embedding material composition for casting according to claim 1 ,
wherein the embedding material composition for casting is for dental casting.

4. A process for casting, comprising:
embedding in the embedding material composition for casting according to claim 1 , a resin pattern for an object of a cast; and
removing the resin pattern by a lost wax process so as to form a mold for the cast,
wherein the resin pattern is formed with a 3D printer utilizing 3D scanning image analysis data of the object of the cast as an output.

Assignees

• Yoshino Gypsum Co

Inventors

• MAMADA Emi
• Sugano Kenichi
• YOSHIKANE Masato

Classifications

• B22C1/00

  Compositions of refractory mould or core materials; Grain structures thereof (refractory materials in general C04B35/00); Chemical or physical features in the formation or manufacture of moulds · CPC title

• A61C13/083

  Porcelain or ceramic teeth {(A61C13/081 takes precedence; preparations A61K6/80)} · CPC title

• B22C1/08 Primary

  for decreasing shrinkage of the mould, e.g. for investment casting · CPC title

• A61C13/20

  Methods or devices for soldering, casting, moulding or melting {(A61C13/04, A61C13/081 take precedence)} · CPC title

• B22C1/185

  containing phosphates, phosphoric acids or its derivatives · CPC title