Ceramic core and method for producing same
US-2015321247-A1 · Nov 12, 2015 · US
Ceramic core, manufacturing method for the same, manufacturing method for casting using the ceramic core, and casting manufactured by the method
US9839957B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9839957-B2 |
| Application number | US-201414474903-A |
| Country | US |
| Kind code | B2 |
| Filing date | Sep 2, 2014 |
| Priority date | Sep 10, 2013 |
| Publication date | Dec 12, 2017 |
| Grant date | Dec 12, 2017 |
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- Title
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Abstract
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A ceramic core includes sintered ceramic powder and a hole opening on a surface of the ceramic core and having an opening portion with a maximum size of 100 μm or less. A manufacturing method for a ceramic core includes: preparing an injection molding composition by mixing ceramic powder and a binder; manufacturing a ceramic compact by performing the injection molding of the injection molding composition; and manufacturing a ceramic core by sintering the ceramic compact, wherein cumulative percentage of coarse powder with a particle diameter of more than 50 μm included in the ceramic powder is 30% or less on an integrated volume particle size distribution curve of the ceramic powder.
First claim
Opening claim text (preview).
What is claimed is: 1. A ceramic core including a sintered body of ceramic powder, wherein an opening portion of a hole present on a surface of the ceramic core has a maximum size of 100 μm or less, and wherein cumulative percentage of coarse powder with a particle diameter of more than 50 μm included in the ceramic powder is 30% or less on an integrated volume particle size distribution curve of the ceramic powder, the cumulative percentage of micropowder with a particle diameter of 5 μm or less in the ceramic powder is 10 to 40%, and the cumulative percentage of the micropowder with a particle diameter of 1 μm or less is less than 5%, and wherein the ceramic powder comprises silica powder (SiO 2 ), 0.1 to 15.0 mass % of alumina powder (Al 2 O 3 ), and 0.5 to 35.0 mass % of zircon powder (ZrSiO 4 ). 2. The ceramic core according to claim 1 , wherein the ceramic core has a relative density of 60% or more. 3. The ceramic core according to claim 1 , wherein a fracture surface of the ceramic core includes transgranular fracture particle of ceramic powder. 4. The ceramic core according to claim 3 , wherein the ceramic core has a relative density of 60% or more.
Assignees
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Classifications
Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina · CPC title
Injection moulding · CPC title
Zirconates or hafnates, e.g. zircon · CPC title
All metal or with adjacent metals · CPC title
Patterns made from expanded plastic materials · CPC title
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Frequently asked questions
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- What does patent US9839957B2 cover?
- A ceramic core includes sintered ceramic powder and a hole opening on a surface of the ceramic core and having an opening portion with a maximum size of 100 μm or less. A manufacturing method for a ceramic core includes: preparing an injection molding composition by mixing ceramic powder and a binder; manufacturing a ceramic compact by performing the injection molding of the injection molding c…
- Who is the assignee on this patent?
- Hitachi Metals Ltd
- What technology area does this patent fall under?
- Primary CPC classification B22C1/00. Mapped technology areas include Operations & Transport.
- When was this patent published?
- Publication date Tue Dec 12 2017 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 1 related publication on this page (citations in our corpus or others sharing the same primary CPC).