JPH09227221A - Alumina porcelain and insulator for spark plug - Google Patents
Alumina porcelain and insulator for spark plugInfo
- Publication number
- JPH09227221A JPH09227221A JP8040852A JP4085296A JPH09227221A JP H09227221 A JPH09227221 A JP H09227221A JP 8040852 A JP8040852 A JP 8040852A JP 4085296 A JP4085296 A JP 4085296A JP H09227221 A JPH09227221 A JP H09227221A
- Authority
- JP
- Japan
- Prior art keywords
- weight
- thermal shock
- component
- insulator
- sintered body
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Compositions Of Oxide Ceramics (AREA)
- Spark Plugs (AREA)
- Inorganic Insulating Materials (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、大きな熱衝撃を受
ける場所で使用するアルミナ磁器、及び大きな熱衝撃が
かかる高出力エンジンに装着するスパークプラグに使用
する絶縁碍子に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an alumina porcelain used in a place subject to a large thermal shock, and an insulator used for a spark plug mounted on a high-power engine subject to a large thermal shock.
【０００２】[0002]
【従来の技術】Ａｌ2 Ｏ3 を主体とするアルミナ磁器は
安価であるので、半導体パッケージ、ノズル口、焼成用
セッター、焼成用厘鉢、焼成炉用ローラ、理化学用磁
器、スパークプラグの絶縁碍子等、色々な製品に使用さ
れている。 2. Description of the Related Art Since alumina porcelain mainly composed of Al 2 O 3 is inexpensive, it is used as a semiconductor package, a nozzle opening, a firing setter, a firing bowl, a firing furnace roller, a physics and chemistry porcelain, and a spark plug insulator. It is used in various products.
【０００３】[0003]
【発明が解決しようとする課題】アルミナ磁器の耐熱衝
撃性が良好であれば、製品の耐久性が向上し、過酷な条
件にも耐えるので、従来より、アルミナ磁器の耐熱衝撃
性能の向上が望まれている。例えば、近年の、高出力、
高圧縮比のエンジンは、熱衝撃が大きいので、この様な
高出力エンジンに装着するスパークプラグには、優れた
耐熱衝撃性能を有する絶縁碍子を使用する必要がある。If the thermal shock resistance of alumina porcelain is good, the durability of the product is improved and it can withstand severe conditions. Therefore, it is desired to improve the thermal shock resistance performance of alumina porcelain. It is rare. For example, in recent years, high output,
Since an engine having a high compression ratio has a large thermal shock, it is necessary to use an insulator having excellent thermal shock resistance for the spark plug mounted on such a high-power engine.
【０００４】発明者らは、研究の結果、アルミナを焼成
する際に添加する焼結助剤の種類や量により、アルミナ
磁器の耐熱衝撃性が変化する事を見いだし、更に、研究
を重ねた結果、焼結助剤中のＢａＯの量が多いと耐熱衝
撃性能を低下させる事を見いだした。これは、ＢａＯの
添加量が多いと、焼結体表面及び焼結体中にセルジアン
（ＢａＯ・Ａｌ2 Ｏ3 ・２ＳｉＯ2 ）等の長石類が析出
する為であるという結論に達した。As a result of research, the inventors have found that the thermal shock resistance of alumina porcelain changes depending on the type and amount of a sintering additive added when firing alumina, and as a result of further research. It was found that a large amount of BaO in the sintering aid deteriorates the thermal shock resistance performance. It was concluded that this is because when a large amount of BaO is added, feldspars such as Celsian (BaO.Al 2 O 3 .2SiO 2 ) are deposited on the surface of the sintered body and in the sintered body.
【０００５】熱膨張係数が、セルジアン（２．４×１０
-6）と、アルミナ（７．０〜７．５×１０-6）とでは大
きく異なるので、セルジアンが析出したアルミナ磁器で
は、熱衝撃が加わると両者の熱膨張差によって表面から
クラックが入る為であると推測される。The coefficient of thermal expansion is Celsian (2.4 × 10
-6 ) and alumina (7.0-7.5 × 10 -6 ) are very different, so in alumina porcelain with Celsian precipitated, when thermal shock is applied, cracks will form from the surface due to the difference in thermal expansion between the two. Is supposed to be.
【０００６】本発明の第１の目的は、耐熱衝撃性能に優
れたアルミナ磁器の提供にある。本発明の第２の目的
は、耐熱衝撃性能に優れた、スパークプラグ用の絶縁碍
子の提供にある。A first object of the present invention is to provide an alumina porcelain excellent in thermal shock resistance. A second object of the present invention is to provide an insulator for a spark plug which is excellent in thermal shock resistance.
【０００７】[0007]
【課題を解決するための手段】上記課題を解決する為、
本発明は、以下の構成を採用した。 （１）アルミナ磁器は、８０〜９７重量％のＡｌ2 Ｏ3
と、３〜２０重量％の第二成分とからなり、該第二成分
は、２．５〜５０重量％のＳｉＯ2 と、０〜１５重量％
のＢａＯと、３５〜９７．５重量％を占め、ＣａＯ、Ｍ
ｇＯ、ＺｎＯ、Ｂ 2 Ｏ3 、ＺｒＯ2 の少なくとも一成分
を含む他成分とからなる。[Means for Solving the Problems] In order to solve the above problems,
The present invention has the following configurations. (1) Alumina porcelain is 80-97 wt% AlTwoOThree
And 3 to 20% by weight of the second component.
Is 2.5 to 50% by weight of SiOTwoAnd 0 to 15% by weight
Of BaO of 35 to 97.5% by weight, CaO, M
gO, ZnO, B TwoOThree, ZrOTwoAt least one component of
It is composed of other ingredients including.
【０００８】（２）スパークプラグ用の絶縁碍子は、８
０〜９７重量％のＡｌ2 Ｏ3 と、３〜２０重量％の第二
成分とからなり、該第二成分は、２．５〜５０重量％の
ＳｉＯ 2 と、０〜１５重量％のＢａＯと、３５〜９７．
５重量％を占め、ＣａＯ、ＭｇＯ、ＺｎＯ、Ｂ2 Ｏ3 、
ＺｒＯ2 の少なくとも一成分を含む他成分とからなる。(2) Insulators for spark plugs are 8
0-97 wt% AlTwoOThreeAnd 3-20% by weight of the second
The second component is 2.5 to 50% by weight.
SiO TwoAnd 0 to 15% by weight of BaO and 35 to 97.
5% by weight, CaO, MgO, ZnO, BTwoOThree,
ZrOTwoAnd other components including at least one component.
【０００９】[0009]
【作用及び発明の効果】アルミナ焼結体（アルミナ磁
器、スパークプラグ用の絶縁碍子）は、８０〜９７重量
％のＡｌ2 Ｏ3 と、３〜２０重量％の第二成分とからな
り、該第二成分は、２．５〜５０重量％のＳｉＯ2 と、
０〜１５重量％のＢａＯと、３５〜９７．５重量％を占
め、ＣａＯ、ＭｇＯ、ＺｎＯ、Ｂ2 Ｏ3 、ＺｒＯ2 の少
なくとも一成分を含む他成分とからなる。FUNCTION AND EFFECT OF THE INVENTION The alumina sintered body (alumina porcelain, insulator for spark plug) is composed of 80 to 97% by weight of Al 2 O 3 and 3 to 20% by weight of the second component. The second component is 2.5 to 50% by weight of SiO 2 , and
It is composed of 0 to 15% by weight of BaO and 35 to 97.5% by weight of other components including at least one component of CaO, MgO, ZnO, B 2 O 3 and ZrO 2 .
【００１０】つまり、アルミナ焼結体の３〜２０重量％
を占める第二成分中に含まれるＢａＯの含有率を、第二
成分の０〜１５重量％に制限している。これにより、焼
結体中及び焼結体表面への長石類（セルジアン等）の析
出が抑制される（耐熱衝撃性能が低下しなくなる）。よ
って、耐熱衝撃性能に優れたアルミナ焼結体（アルミナ
磁器、スパークプラグ用の絶縁碍子）が得られる。That is, 3 to 20% by weight of the alumina sintered body
The content of BaO contained in the second component is limited to 0 to 15% by weight of the second component. As a result, the precipitation of feldspars (Celsian etc.) in the sintered body and on the surface of the sintered body is suppressed (the thermal shock resistance does not deteriorate). Therefore, an alumina sintered body (alumina porcelain, insulator for spark plug) having excellent thermal shock resistance can be obtained.
【００１１】[0011]
【発明の実施の形態】本発明の第１実施例（請求項１に
対応）を説明する。焼結体テストピースは、以下の様に
して製造される。尚、発明品は、Ｎｏ．２、５、６、
９、１１、１２、１３の焼結体テストピースである。BEST MODE FOR CARRYING OUT THE INVENTION A first embodiment (corresponding to claim 1) of the present invention will be described. The sintered test piece is manufactured as follows. The invention products are No. 2, 5, 6,
It is a sintered compact test piece of 9, 11, 12, and 13.
【００１２】(1) ＳｉＯ2 、ＢａＯ、ＣａＯ、Ｂ
2 Ｏ3 、ＺｎＯの各成分を、調合割合が異なる様に調合
して１４種類の調合粉（平均粒径１．０〜２．０μｍ）
を製造する。尚、ＢａＯ成分はＢａＣＯ3 、ＣａＯ成分
はＣａＣＯ3 、Ｂ2 Ｏ3 成分はＨ3 ＢＯ3 として換算
し、添加した。又、他成分（焼結後）は他の組成系で添
加しても良い。(1) SiO 2 , BaO, CaO, B
14 kinds of compounded powders (average particle size 1.0 to 2.0 μm) were prepared by mixing the respective components of 2 O 3 and ZnO in different mixing ratios.
To manufacture. The BaO component was converted into BaCO 3 , the CaO component was converted into CaCO 3 , and the B 2 O 3 component was converted into H 3 BO 3 and added. Further, other components (after sintering) may be added in another composition system.
【００１３】発明品の焼結体テストピースＮｏ．２、
５、６、９、１１、１２、１３に係る調合粉の各成分の
割合の具体的数値を表１に示す。これらの調合粉と、平
均粒径１．５〜２．０μｍのＡｌ2 Ｏ3 （純度９９％）
とを、調合割合を変えて混合し、１４種類の原料粉を製
造する。Inventive sintered body test piece No. 2,
Table 1 shows specific numerical values of the ratios of the components of the mixed powders according to 5, 6, 9, 11, 12, and 13. Al 2 O 3 with an average particle size of 1.5 to 2.0 μm (purity 99%)
And are mixed at different mixing ratios to produce 14 kinds of raw material powders.
【００１４】[0014]
【表１】 [Table 1]
【００１５】(2) これらの原料粉に、夫々、バインダー
（ＰＶＡを原料粉の４重量％添加）と水を加え、１０Ｈ
ｒ、ボールミルで混合した後、スプレー造粒を行う。 (3) １４種類のスプレー造粒品を同一形状の金型（本実
施例では空所が四角柱）に入れ、各々、５０Ｍｐａでプ
レスした後、表２に示す焼成温度（１５００℃〜１６０
０℃×１Ｈｒ）で焼成し、１４種類の焼結体テストピー
ス（２×５×長さ５０ｍｍの柱体；Ｎｏ．１〜Ｎｏ．１
４）を各５個ずつ製造する。(2) A binder (4% by weight of PVA added to the raw material powder) and water were added to each of these raw material powders to add 10H.
After mixing with r and a ball mill, spray granulation is performed. (3) 14 kinds of spray granulated products were put into a mold having the same shape (in this embodiment, the hollow space is a square pole) and pressed at 50 Mpa, respectively, and then the firing temperature shown in Table 2 (1500 ° C. to 160 ° C.).
Baking at 0 ° C. × 1 Hr), 14 kinds of sintered body test pieces (2 × 5 × columns with a length of 50 mm; No. 1 to No. 1)
5) are produced in each case.
【００１６】[0016]
【表２】 [Table 2]
【００１７】つぎに、焼結体テストピース（Ｎｏ．１〜
Ｎｏ．１４）の、鉱物組成検査、及び成分分析検査につ
いて述べる。完成した焼結体テストピース（Ｎｏ．１〜
Ｎｏ．１４）に対し、表面のＸ線回折を行って鉱物組成
を調べた。又、Ｘ線回折を行った後、各焼結体テストピ
ースを砕き、化学分析により、構成成分の割合を調べ
た。尚、各結果を表２に示す。Next, sintered test pieces (No. 1 to No. 1)
No. 14) Mineral composition inspection and component analysis inspection will be described. Completed sintered body test piece (No. 1
No. 14), the surface was subjected to X-ray diffraction to examine the mineral composition. Moreover, after performing X-ray diffraction, each sintered body test piece was crushed, and the ratio of constituent components was examined by chemical analysis. The results are shown in Table 2.
【００１８】つぎに、焼結体テストピース（Ｎｏ．１〜
Ｎｏ．１４）の、熱衝撃試験について述べる。残りの焼
結体テストピース（Ｎｏ．１〜Ｎｏ．１４）に対し、図
１に示す熱衝撃試験装置により熱衝撃試験を行って耐熱
衝撃性能を判定した。尚、各結果を表２に示す。Next, sintered test pieces (No. 1 to No. 1)
No. The thermal shock test of 14) will be described. The remaining sintered body test pieces (No. 1 to No. 14) were subjected to a thermal shock test by the thermal shock test device shown in FIG. The results are shown in Table 2.
【００１９】図１において、１は焼結体テストピース
（Ｎｏ．１〜Ｎｏ．１４）、２は加熱用のバーナ、３は
冷却用の冷却エアー、４は焼結体テストピース１の表面
温度を監視する為の放射温度計である。In FIG. 1, 1 is a sintered body test piece (No. 1 to No. 14), 2 is a burner for heating, 3 is cooling air for cooling, and 4 is a surface temperature of the sintered body test piece 1. It is a radiation thermometer for monitoring.
【００２０】熱衝撃試験は、放射温度計４で焼結体テス
トピース１の表面温度を監視しながら、バーナ２や冷却
エアー３を作動させ、１０００℃（１分）と、２５０℃
（１０秒間）とを繰り返し行い、１０サイクル毎に蛍光
探傷検査を実施した。In the thermal shock test, while monitoring the surface temperature of the sintered body test piece 1 with the radiation thermometer 4, the burner 2 and the cooling air 3 are operated to operate at 1000 ° C. (1 minute) and 250 ° C.
(10 seconds) was repeated and the fluorescent flaw detection inspection was performed every 10 cycles.
【００２１】５０サイクル以内で割れが確認されたもの
は、耐熱衝撃性能に劣る（×）と判定し、５０サイクル
を越えて熱衝撃試験を行っても割れが確認されないもの
は、耐熱衝撃性能に優れる（〇）と判定した。Those with cracks confirmed within 50 cycles were judged to be inferior in thermal shock resistance (x), and those with no cracks confirmed even after a thermal shock test for more than 50 cycles had thermal shock performance. It was judged to be excellent (○).
【００２２】つぎに、本実施例の利点を述べる。ＳｉＯ
2 と、ＢａＯと、ＣａＯ、ＭｇＯ、ＺｎＯ、Ｂ2 Ｏ3 、
ＺｒＯ2 の少なくとも一成分を含む他成分とからなる第
二成分を３〜２０重量％含有し、残部（８０〜９７重量
％）をＡｌ2 Ｏ3 が占め、且つ、第二成分中のＢａＯの
含有量が第二成分の０〜１５重量％と少ない（又は存在
しない）焼結体テストピース（Ｎｏ．２、５、６、９、
１１、１２、１３）は、表１に示す様にセルジアンの析
出が見られず、優れた耐熱衝撃性能を示す。Next, the advantages of this embodiment will be described. SiO
2 , BaO, CaO, MgO, ZnO, B 2 O 3 ,
It contains 3 to 20% by weight of the second component consisting of at least one component of ZrO 2 and the other component (80 to 97% by weight), and Al 2 O 3 occupies the balance (80 to 97% by weight) of BaO in the second component. Sintered body test piece (No. 2, 5, 6, 9) whose content is as small as 0 to 15% by weight of the second component (or does not exist),
Nos. 11, 12, and 13) show no precipitation of Celsian as shown in Table 1 and show excellent thermal shock resistance.
【００２３】つぎに、本発明の第２実施例（請求項２に
対応）を説明する。第１実施例の焼結体テストピース１
（Ｎｏ．１〜Ｎｏ．１４）を製造する際に使用したもの
と同じ調合割合で原料粉を上記(1) に準じて製造する。Next, a second embodiment of the present invention (corresponding to claim 2) will be described. Sintered body test piece 1 of the first embodiment
Raw material powders are manufactured according to the above (1) in the same mixing ratio as that used in manufacturing (No. 1 to No. 14).
【００２４】この１４種類の原料粉を用い、上記(2) と
同様の方法でスプレー造粒を行い、軸孔を有する絶縁碍
子形状の未焼成体を４本ずつ、合計５６本、ラバープレ
スにより製造する。これら未焼成体を、同様の焼成温度
（１５００℃〜１６００℃×１Ｈｒ；表１参照）で焼成
して絶縁碍子を１４種類、合計５６本、製造する。Using these 14 kinds of raw material powders, spray granulation was carried out in the same manner as in the above (2), and four unbaked insulator-shaped bodies each having a shaft hole, a total of 56 pieces, by a rubber press. To manufacture. These unfired bodies are fired at the same firing temperature (1500 ° C. to 1600 ° C. × 1 Hr; see Table 1) to produce 14 types of insulators, 56 in total.
【００２５】これらの絶縁碍子軸孔内に、中心電極及び
端子電極を挿入してガラスシールし、外側電極を有する
ネジ径１２ｍｍの主体金具に組み付けるとスパークプラ
グ（１４種類、合計５６本）が完成する。A center electrode and a terminal electrode are inserted into these insulator shaft holes, glass-sealed, and assembled with a metal shell having an outer electrode and a screw diameter of 12 mm to complete a spark plug (14 types, 56 in total). To do.
【００２６】これらのスパークプラグを、高出力、高圧
縮比のエンジンに装着して、５５００ｒｐｍ（４／４負
荷）×３分- アイドリング３分の繰り返し（５００回）
条件でエンジン試験を行ったところ、焼結体テストピー
ス（Ｎｏ．２、５、６、９、１１、１２、１３）と同じ
調合割合の原料粉で製造したものが、絶縁碍子に異常が
無く、優れた耐熱衝撃性能を示す事が確認された。These spark plugs were mounted on a high-power, high-compression-ratio engine, and 5500 rpm (4/4 load) × 3 minutes-idling 3 minutes repeated (500 times).
When an engine test was performed under the conditions, it was found that the insulator manufactured by using the raw material powder with the same mixing ratio as the sintered test piece (No. 2, 5, 6, 9, 11, 12, 13) showed no abnormality in the insulator. It was confirmed that it showed excellent thermal shock resistance.
【図１】熱衝撃試験を行う為の熱衝撃試験装置の構成を
示す説明図である。FIG. 1 is an explanatory diagram showing a configuration of a thermal shock test device for performing a thermal shock test.
１ 焼結体テストピース（アルミナ磁器） 1 Sintered body test piece (alumina porcelain)
Claims (2)
２０重量％の第二成分とからなり、 該第二成分は、２．５〜５０重量％のＳｉＯ2 と、０〜
１５重量％のＢａＯと、３５〜９７．５重量％を占め、
ＣａＯ、ＭｇＯ、ＺｎＯ、Ｂ2 Ｏ3 、ＺｒＯ2の少なく
とも一成分を含む他成分とからなるアルミナ磁器。1. Al 2 O 3 in an amount of 80 to 97% by weight, and 3 to
20% by weight of the second component, the second component comprising 2.5 to 50% by weight of SiO 2 and 0 to
15% by weight of BaO and 35 to 97.5% by weight,
An alumina porcelain comprising at least one of CaO, MgO, ZnO, B 2 O 3 and ZrO 2 .
２０重量％の第二成分とからなり、 該第二成分は、２．５〜５０重量％のＳｉＯ2 と、０〜
１５重量％のＢａＯと、３５〜９７．５重量％を占め、
ＣａＯ、ＭｇＯ、ＺｎＯ、Ｂ2 Ｏ3 、ＺｒＯ2の少なく
とも一成分を含む他成分とからなる、スパークプラグ用
の絶縁碍子。2. 80 to 97% by weight of Al 2 O 3 and 3 to
20% by weight of the second component, the second component comprising 2.5 to 50% by weight of SiO 2 and 0 to
15% by weight of BaO and 35 to 97.5% by weight,
CaO, MgO, ZnO, consisting of the other component comprising at least one component of B 2 O 3, ZrO 2, insulator for a spark plug.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8040852A JPH09227221A (en) | 1996-02-28 | 1996-02-28 | Alumina porcelain and insulator for spark plug |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8040852A JPH09227221A (en) | 1996-02-28 | 1996-02-28 | Alumina porcelain and insulator for spark plug |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09227221A true JPH09227221A (en) | 1997-09-02 |
Family
ID=12592107
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8040852A Pending JPH09227221A (en) | 1996-02-28 | 1996-02-28 | Alumina porcelain and insulator for spark plug |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09227221A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007284333A (en) * | 2006-03-20 | 2007-11-01 | Sumitomo Metal Electronics Devices Inc | High reflection white ceramics, reflector, substrate for mounting semiconductor light emitting element and package for housing semiconductor light emitting element |
| WO2010001760A1 (en) * | 2008-06-30 | 2010-01-07 | 日本カーバイド工業株式会社 | Alumina ceramic |
| JP2011154908A (en) * | 2010-01-27 | 2011-08-11 | Ngk Spark Plug Co Ltd | Spark plug, insulator for the same, and its manufacturing method |
| WO2012011587A1 (en) * | 2010-07-23 | 2012-01-26 | 日本カーバイド工業株式会社 | Alumina ceramic and substrate for mounting light-emitting element using same |
| WO2015141100A1 (en) * | 2014-03-19 | 2015-09-24 | 日本碍子株式会社 | Ceramic body and method for producing same |
-
1996
- 1996-02-28 JP JP8040852A patent/JPH09227221A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007284333A (en) * | 2006-03-20 | 2007-11-01 | Sumitomo Metal Electronics Devices Inc | High reflection white ceramics, reflector, substrate for mounting semiconductor light emitting element and package for housing semiconductor light emitting element |
| WO2010001760A1 (en) * | 2008-06-30 | 2010-01-07 | 日本カーバイド工業株式会社 | Alumina ceramic |
| CN102026935A (en) * | 2008-06-30 | 2011-04-20 | 日本碳化物工业株式会社 | Alumina ceramic |
| US8198204B2 (en) | 2008-06-30 | 2012-06-12 | Nippon Carbide Kogyo Kabushiki Kaisha | Alumina ceramic |
| JP5479335B2 (en) * | 2008-06-30 | 2014-04-23 | 日本カーバイド工業株式会社 | Light reflecting material for light emitting element |
| KR101508296B1 (en) * | 2008-06-30 | 2015-04-06 | 닛뽕 카바이도 고교 가부시키가이샤 | Alumina ceramic |
| JP2011154908A (en) * | 2010-01-27 | 2011-08-11 | Ngk Spark Plug Co Ltd | Spark plug, insulator for the same, and its manufacturing method |
| WO2012011587A1 (en) * | 2010-07-23 | 2012-01-26 | 日本カーバイド工業株式会社 | Alumina ceramic and substrate for mounting light-emitting element using same |
| WO2015141100A1 (en) * | 2014-03-19 | 2015-09-24 | 日本碍子株式会社 | Ceramic body and method for producing same |
| CN106458761A (en) * | 2014-03-19 | 2017-02-22 | 日本碍子株式会社 | Ceramic body and method for producing same |
| JPWO2015141100A1 (en) * | 2014-03-19 | 2017-04-06 | 日本碍子株式会社 | Ceramic substrate and manufacturing method thereof |
| CN106458761B (en) * | 2014-03-19 | 2019-08-06 | 日本碍子株式会社 | Ceramic matrix and its manufacturing method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR101185256B1 (en) | Ceramic with improved high temperature electrical properties for use as a spark plug insulator | |
| JP4530380B2 (en) | Spark plug insulator and spark plug including the same | |
| US9912125B2 (en) | Spark plug | |
| KR20090101253A (en) | Ceramic with improved high temperature electrical properties for use as a spark plug insulator | |
| JPS63190753A (en) | Alumina ceramic and ignition plug | |
| EP3148020B1 (en) | Spark plug | |
| JPH0717436B2 (en) | Method for producing highly insulating and highly alumina-based porcelain composition | |
| JPH09227221A (en) | Alumina porcelain and insulator for spark plug | |
| JPS631262B2 (en) | ||
| US9653888B2 (en) | Spark plug | |
| JP5728416B2 (en) | Spark plug | |
| JPS62187156A (en) | Manufacture of high insulation high alumina ceramic composition | |
| JP2009242234A (en) | Insulator for spark plug, method of manufacturing the same and spark plug using the same | |
| JP2011154908A (en) | Spark plug, insulator for the same, and its manufacturing method | |
| US2975145A (en) | Semi-conductive ceramic composition | |
| JPH04118883A (en) | Ceramic sintered body and speak plug | |
| JP2000272957A (en) | Insulating material for spark plug and spark plug using the same | |
| JPS62143866A (en) | Manufacture of high insulation high alumina base ceramic composition | |
| JPS62100474A (en) | Manufacture of high insulation high alumina base ceramic composition | |
| JP2000272958A (en) | Insulating material for spark plug, its production and spark plug using the same | |
| JP2017201576A (en) | Spark plug | |
| JPH0674165B2 (en) | Method for producing highly insulating and highly alumina-based porcelain composition | |
| JPS58123602A (en) | Sintered silicon nitride insulating insulator for ignition plug | |
| JPH09260019A (en) | Spark plug for internal combustion engine | |
| JPH0260082A (en) | Manufacture of spark plug for internal combustion engine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20040802 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20041208 |
|
| A521 | Written amendment |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20050207 |
|
| A02 | Decision of refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A02 Effective date: 20050517 |