Ceramic sintered body
US-8927447-B2 · Jan 6, 2015 · US
Ceramic composition and cutting tool
US9550699B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9550699-B2 |
| Application number | US-201314419511-A |
| Country | US |
| Kind code | B2 |
| Filing date | Dec 27, 2013 |
| Priority date | Aug 8, 2013 |
| Publication date | Jan 24, 2017 |
| Grant date | Jan 24, 2017 |
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Abstract
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In a ceramic composition mainly composed of alumina (Al 2 O 3 ), tungsten carbide (WC) and zirconia (ZrO 2 ), zirconium (Zr) is distributed in a first grain boundary as an interface where an alumina (Al 2 O 3 ) crystal grain is adjacent to a tungsten carbide (WC) crystal grain and in a second grain boundary as an interface where two alumina (Al 2 O 3 ) crystal grains are adjacent to each other.
First claim
Opening claim text (preview).
What is claimed is: 1. A ceramic composition mainly composed of alumina (Al 2 O 3 ), tungsten carbide (WC) and at least one compound selected from the group consisting of compounds of transition metals (except tungsten (W)) belonging to groups 4 to 6 in a periodic table, yttrium compounds, scandium compounds and lanthanide compounds, wherein at least one element selected from the group consisting of transition metals (except tungsten (W)) belonging to the groups 4 to 6 in the periodic table, yttrium (Y), scandium (Sc) and lanthanide series is distributed in a first grain boundary as an interface where an alumina (Al 2 O 3 ) crystal grain is adjacent to a tungsten carbide (WC) crystal grain and in a second grain boundary as an interface where two alumina (Al 2 O 3 ) crystal grains are adjacent to each other. 2. The ceramic composition according to claim 1 , wherein on a cross section of the ceramic composition, a relationship between a cross sectional area A of a tungsten carbide (WC) crystal grain which is not adjacent to another tungsten carbide (WC) crystal grain but is surrounded by at least one type of crystal grain selected from the group consisting of alumina (Al 2 O 3 ), the compounds of transition metals belonging to the groups 4 to 6 (except tungsten (W)) in the periodic table, the yttrium compounds, the scandium compounds and the lanthanide compounds and a cross sectional area B of a tungsten carbide (WC) crystal grain adjacent to another tungsten carbide (WC) crystal grain satisfies 1.5≦A/(A+B)×100≦50.0. 3. The ceramic composition according to claim 1 , wherein tungsten carbide (WC) occupies a part of not lower than 20.0% by volume and not higher than 50.0% by volume, a zirconium compound occupies a part of not lower than 0.1% by volume and not higher than 18.0% by volume, and alumina (Al 2 O 3 ) occupies a residual part. 4. The ceramic composition according to claim 1 , wherein tungsten carbide (WC) occupies a part of not lower than 20.0% by volume and not higher than 50.0% by volume, a zirconium compound occupies a part of not lower than 0.1% by volume and not higher than 18.0% by volume, any of the compounds of transition metals belonging to the groups 4 to 6 (except zirconium (Zr) and tungsten (W)) in the periodic table, the yttrium compounds, the scandium compounds and the lanthanide compounds occupies a part of not lower than 0.1% by volume and not higher than 1.0% by volume, and alumina (Al 2 O 3 ) occupies a residual part. 5. The ceramic composition according to claim 1 , wherein tungsten carbide (WC) occupies a part of not lower than 20.0% by volume and not higher than 50.0% by volume, any of the compounds of transition metals belonging to the groups 4 to 6 (except zirconium (Zr) and tungsten (W)) in the periodic table, the yttrium compounds, the scandium compounds and the lanthanide compounds occupies a part of not lower than 0.1% by volume and not higher than 1.0% by volume, and alumina (Al 2 O 3 ) occupies a residual part. 6. A cutting tool made of the ceramic composition according to claim 1 .
Assignees
Inventors
Classifications
micrometer sized, i.e. from 1 to 100 micron · CPC title
Intergranular or grain boundary phases · CPC title
Thermal properties, e.g. thermal expansion coefficient · CPC title
Tungsten carbides · CPC title
Pressure sintering · CPC title
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Frequently asked questions
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- What does patent US9550699B2 cover?
- In a ceramic composition mainly composed of alumina (Al 2 O 3 ), tungsten carbide (WC) and zirconia (ZrO 2 ), zirconium (Zr) is distributed in a first grain boundary as an interface where an alumina (Al 2 O 3 ) crystal grain is adjacent to a tungsten carbide (WC) crystal grain and in a second grain boundary as an interface where two alumina (Al 2 O 3 ) crystal grains are adjacent to each other.
- Who is the assignee on this patent?
- Ngk Spark Plug Co
- What technology area does this patent fall under?
- Primary CPC classification C04B35/119. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Jan 24 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).