Spark plug
US-2024275138-A1 · Aug 15, 2024 · US
Alumina sintered body and spark plug using the same
US2016254651A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2016254651-A1 |
| Application number | US-201615053256-A |
| Country | US |
| Kind code | A1 |
| Filing date | Feb 25, 2016 |
| Priority date | Feb 27, 2015 |
| Publication date | Sep 1, 2016 |
| Grant date | — |
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Abstract
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An alumina sintered body has a main phase made of alumina crystals, a first dispersed phase made of MgAl 2 O 4 dispersed in the main phase, and a second dispersed phase made of SiO 2 and/or CaO dispersed in the main phase. A content ratio of the main phase is within a range from not less than 98% to less than 98%. The alumina sintered body satisfies a relationship of 100×I 2 /I 1 ≧5.5%, where I 1 indicates a maximum peak height intensity derived from alumina, and I 2 indicates a maximum peak height intensity derived from MgAl 2 O 4 in a X-ray diffraction of the alumina sintered body. An area ratio of the second dispersed phase on a surface of the alumina sintered body is not more than 15.2%. A spark plug has a central electrode, a ground electrode and an insulator made of the alumina sintered body having the specific features previously described.
First claim
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What is claimed is: 1 . An alumina sintered body comprising: a main phase made of alumina crystals; a first dispersed phase made of MgAl 2 O 4 dispersed in the main phase; and a second dispersed phase made of SiO 2 and/or CaO dispersed in the main phase, wherein a content ratio of the main phase is within a range from not less than 90% to less than 98%, the alumina sintered body satisfies a relationship of 100 33 I 2 /I 1 ≧5.5%, where I 1 indicates a maximum peak height intensity derived from alumina and I 2 indicates a maximum peak height intensity derived from MgAl 2 O 4 in a X-ray diffraction of the alumina sintered body, and an area ratio of the second dispersed phase on a surface of the alumina sintered body is not more than 15.2%. 2 . The alumina sintered body according to claim 1 , wherein the alumina sintered body is made of a fired mixture of alumina, magnesia and silica and/or calcia. 3 . The alumina sintered body according to claim 1 , wherein the alumina sintered body satisfies the relationship of 100×I 2 /I 1 ≧23.3%. 4 . The alumina sintered body according to claim 2 , wherein the alumina sintered body satisfies the relationship of 100×I 2 /I 1 ≧23.3%. 5 . The alumina sintered body according to claim 1 , wherein the alumina sintered body is used as an insulator of a spark plug in an internal combustion engine using alcohol fuel. 6 . The alumina sintered body according to claim 2 , wherein the alumina sintered body is used as an insulator of a spark plug in an internal combustion engine using alcohol fuel. 7 . The alumina sintered body according to claim 3 , wherein the alumina sintered body is used as an insulator of a spark plug in an internal combustion engine using alcohol fuel. 8 . A spark plug comprising an insulator made of the alumina sintered body according to claim 1 . 9 . A spark plug comprising an insulator made of the alumina sintered body according to claim 2 . 10 . A spark plug comprising an insulator made of the alumina sintered body according to claim 3 .
Assignees
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Classifications
Devitrified glass ceramics, i.e. glass ceramics having a crystalline phase dispersed in a glassy phase and constituting at least 50% by weight of the total composition · CPC title
- H01T13/38Primary
Selection of materials for insulation · CPC title
Composites · CPC title
Resistance against chemicals, e.g. against molten glass or molten salts · CPC title
Alkali metal oxides or oxide-forming salts thereof · CPC title
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- What does patent US2016254651A1 cover?
- An alumina sintered body has a main phase made of alumina crystals, a first dispersed phase made of MgAl 2 O 4 dispersed in the main phase, and a second dispersed phase made of SiO 2 and/or CaO dispersed in the main phase. A content ratio of the main phase is within a range from not less than 98% to less than 98%. The alumina sintered body satisfies a relationship of 100×I 2 /I 1 ≧5.5%, where…
- Who is the assignee on this patent?
- Denso Corp
- What technology area does this patent fall under?
- Primary CPC classification H01T13/38. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Thu Sep 01 2016 00:00:00 GMT+0000 (Coordinated Universal Time) (A1). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).