JPH09315849A - Aluminous sintered compact or insulator for spark plug and its production - Google Patents
Aluminous sintered compact or insulator for spark plug and its productionInfo
- Publication number
- JPH09315849A JPH09315849A JP8154781A JP15478196A JPH09315849A JP H09315849 A JPH09315849 A JP H09315849A JP 8154781 A JP8154781 A JP 8154781A JP 15478196 A JP15478196 A JP 15478196A JP H09315849 A JPH09315849 A JP H09315849A
- Authority
- JP
- Japan
- Prior art keywords
- insulator
- alumina
- spark plug
- ceramics
- density
- 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
- 239000012212 insulator Substances 0.000 title claims abstract description 51
- 238000004519 manufacturing process Methods 0.000 title claims description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 53
- 239000000919 ceramic Substances 0.000 claims abstract description 25
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 10
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 8
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 6
- 239000000470 constituent Substances 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 5
- 239000007789 gas Substances 0.000 claims description 4
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- 230000001590 oxidative effect Effects 0.000 claims description 4
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims description 3
- 229910052786 argon Inorganic materials 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 abstract 2
- 229910018404 Al2 O3 Inorganic materials 0.000 abstract 1
- 230000002542 deteriorative effect Effects 0.000 abstract 1
- 239000004065 semiconductor Substances 0.000 description 15
- 238000002485 combustion reaction Methods 0.000 description 13
- 230000017525 heat dissipation Effects 0.000 description 10
- 239000000758 substrate Substances 0.000 description 10
- 230000000694 effects Effects 0.000 description 5
- 238000005245 sintering Methods 0.000 description 4
- 239000002184 metal Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- 239000004372 Polyvinyl alcohol Substances 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 229920002451 polyvinyl alcohol Polymers 0.000 description 2
- 238000007088 Archimedes method Methods 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000013001 point bending Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Compositions Of Oxide Ceramics (AREA)
- Spark Plugs (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、半導体基板又は
内燃機関用スパークプラグの絶縁碍子等の放熱又は熱伝
導を要求される部位に使用されるアルミナ質焼結体又は
スパークプラグ用絶縁碍子とその製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an alumina-based sintered body or an insulator for a spark plug, which is used in a portion of a semiconductor substrate or an insulator of a spark plug for an internal combustion engine where heat dissipation or heat conduction is required. It relates to a manufacturing method.
【０００２】[0002]
【従来の技術】従来、半導体基板又は内燃機関用スパー
クプラグの絶縁碍子等の放熱又は熱伝導を要求される部
位に使用されるアルミナ質焼結体又はスパークプラグ用
絶縁碍子においては、優れた耐熱性、高い熱伝導率によ
る効率的な放熱性、熱膨張変化の小ささによる半導体チ
ップの直接搭載の容易性及び電気特性に優れ、機械的強
度が高い等の諸特性を満たすアルミナ（Ａｌ2 Ｏ3 ）を
主成分としたものが一般的に使用されている。2. Description of the Related Art Conventionally, an alumina sintered body or an insulator for a spark plug, which has been used in a portion of a semiconductor substrate or an insulator of a spark plug for an internal combustion engine where heat dissipation or heat conduction is required, has an excellent heat resistance. Of alumina (Al 2 O), which has various characteristics such as high heat resistance, efficient heat dissipation due to high thermal conductivity, ease of direct mounting of semiconductor chip due to small change in thermal expansion, and excellent electrical characteristics and high mechanical strength. Those containing 3 ) as the main component are generally used.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、上記半
導体基板又は内燃機関用スパークプラグの絶縁碍子等の
放熱又は熱伝導を要求される部位に使用されるアルミナ
（Ａｌ2 Ｏ3 ）を主成分としたアルミナ質焼結体又はス
パークプラグ用絶縁碍子においては、近年、半導体又は
ターボチャージャー等の補機類の装着による内燃機関の
高性能化に伴って半導体自体又は内燃機関の発生する熱
量は著しく増加することとなった結果、この半導体を構
成する半導体基板又はスパークプラグを構成する絶縁体
碍子が受けることとなる熱量も大幅に増加し、半導体を
構成する半導体基板又は内燃機関に装着されるスパーク
プラグ用絶縁体碍子においては、更に高い放熱性を有す
ることが要求されるものとなる。However, the main component is alumina (Al 2 O 3 ) which is used in the semiconductor substrate or the insulator of the spark plug for an internal combustion engine where heat radiation or heat conduction is required. In an alumina sintered body or an insulator for a spark plug, the amount of heat generated by the semiconductor itself or the internal combustion engine significantly increases in recent years as the performance of the internal combustion engine increases due to the attachment of auxiliary equipment such as semiconductors or turbochargers. As a result, the amount of heat that the semiconductor substrate that constitutes this semiconductor or the insulator that constitutes the spark plug receives is also greatly increased, and for the semiconductor substrate that constitutes the semiconductor or for the spark plug mounted on the internal combustion engine. Insulator insulators are required to have higher heat dissipation.
【０００４】特に、最近の内燃機関では、出力や燃費の
向上軽量化等を目的として内燃機関の小型化が図られて
おり、この内燃機関に装着されることとなるスパークプ
ラグにおいても４バブル化による取付スペースの縮小に
伴って小型化が要求されることとなるため、現状のアル
ミナ（Ａｌ2 Ｏ3 ）を主成分とするスパークプラグ用絶
縁碍子では、小型化された絶縁碍子によっては放熱性を
十分に確保することができず、また絶縁体脚長部の脚長
を多く取れないため自己清浄性を発揮し難くなる等か
ら、絶縁体脚長部の耐汚損性が著しく低下してしまう欠
点がある。Particularly, in recent internal combustion engines, the internal combustion engine has been downsized for the purpose of improving the output and fuel consumption and reducing the weight, and the spark plug to be mounted on this internal combustion engine has four bubbles. As the mounting space is reduced due to the requirement for downsizing, the current situation is that spark insulators mainly made of alumina (Al 2 O 3 ) have a heat dissipation property depending on the size of the insulator. Cannot be sufficiently secured, and it is difficult to exert self-cleaning property because the leg length of the insulator leg part cannot be made large.Therefore, there is a drawback that the stain resistance of the insulator leg part is significantly reduced. .
【０００５】そこで、この発明は上記従来のものの持つ
欠点を改善するものであり、半導体基板又は内燃機関用
スパークプラグの絶縁碍子等の放熱又は熱伝導を要求さ
れる部位に使用されるアルミナ（Ａｌ2 Ｏ3 ）を主成分
とするアルミナ質焼結体又はスパークプラグ用絶縁碍子
の有する優れた諸特性を十分に維持しつつ、更にその熱
伝導率を高めて放熱性を向上させようとするものであ
る。Therefore, the present invention is to improve the drawbacks of the above-mentioned conventional ones. Alumina (Al) used in a portion such as a semiconductor substrate or an insulator of a spark plug for an internal combustion engine where heat radiation or heat conduction is required. 2 O 3) while maintaining sufficiently excellent properties possessed by the alumina sintered body or the insulator for a spark plug as a main component, intended to improve the heat radiation property further enhances its thermal conductivity Is.
【０００６】[0006]
【課題を解決するための手段】そのために、アルミナ質
焼結体又はスパークプラグ用絶縁碍子に使用されるアル
ミナ質セラミックスにおいては、セラミックス構成成分
より算出される密度に対する嵩密度の比率（×１００
％）すなわち、嵩密度／算出密度×１００を９８％以上
（相対密度）とし、更に上記アルミナ質セラミックスに
おけるアルミナ（Ａｌ2 Ｏ3 ）の含有率を９０ｗｔ％以
上とするものである。なお、ここでいう嵩密度とは、粒
子間に生ずる空隙を含む体積を基準とした密度をいい、
一般には物体の体積を測定して定める。Therefore, in the alumina ceramics used for the alumina sintered body or the insulator for spark plug, the ratio of the bulk density to the density calculated from the ceramic constituent components (× 100).
%), That is, the bulk density / calculated density × 100 is 98% or more (relative density), and the content of alumina (Al 2 O 3 ) in the alumina ceramic is 90 wt% or more. The bulk density referred to here is a density based on the volume including voids generated between particles,
Generally, it is determined by measuring the volume of an object.
【０００７】また、このアルミナ質焼結体又はスパーク
プラグ用絶縁碍子に使用されるアルミナ質セラミックス
においては、アルミナ（Ａｌ2 Ｏ3 ）を主成分とし、こ
れにＳｉ、Ｃａ若しくはＭｇの酸化物或は炭酸塩、又は
これらの混合物を混合するアルミナ質セラミックスを所
定形状に成形した後、この成形物を窒素又はアルゴンガ
ス等の非酸化雰囲気中で１５００〜１７００℃で焼結さ
せて製造してなるものである。Further, in the alumina ceramics used for the alumina sintered body or the insulator for spark plug, alumina (Al 2 O 3 ) is the main component, and the oxide of Si, Ca or Mg or Is produced by forming a carbonate or an alumina ceramics mixed with a mixture thereof into a predetermined shape and then sintering the formed product at 1500 to 1700 ° C. in a non-oxidizing atmosphere such as nitrogen or argon gas. It is a thing.
【０００８】[0008]
【発明の実施の形態】この発明を実施するにあたって、
アルミナ質焼結体又はスパークプラグ用絶縁碍子に使用
されるアルミナ質セラミックスにおいては、セラミック
ス構成成分より算出される密度に対する嵩密度の比率
（×１００％）を９８％以上の相対密度とすることで熱
伝導率が高められるので、増加する受熱量に対する半導
体基板又はスパークプラグ用絶縁碍子の放熱性を十分に
向上させることができる。DESCRIPTION OF THE PREFERRED EMBODIMENTS In practicing the present invention,
In the alumina ceramics used for the alumina sintered body or the insulator for a spark plug, the ratio of the bulk density to the density calculated from the ceramic constituent components (× 100%) is set to a relative density of 98% or more. Since the thermal conductivity is increased, it is possible to sufficiently improve the heat dissipation of the semiconductor substrate or the spark plug insulator with respect to the increased amount of heat received.
【０００９】また、上記アルミナ質焼結体又はスパーク
プラグ用絶縁碍子に使用されるアルミナ質セラミックス
におけるアルミナ（Ａｌ2 Ｏ3 ）の含有率を９０ｗｔ％
以上とすることにより、アルミナの含有率が９０ｗｔ％
以下であるとアルミナ質セラミックスの熱伝導を阻害す
る原因となるアルミナの粒界相生成物の顕著な発生を抑
制することができるので、確実に熱伝導を行うことがで
きるものとなる。The content of alumina (Al 2 O 3 ) in the alumina ceramics used for the above-mentioned alumina sintered body or the insulator for spark plug is 90 wt%.
By the above, the content rate of alumina is 90 wt%
The following can suppress the remarkable generation of the grain boundary phase product of alumina, which causes the heat conduction of the alumina-based ceramics, so that the heat conduction can be surely performed.
【００１０】[0010]
【実施例】この発明を図に示す実施例により更に説明す
る。（１）は、この発明の実施例であるスパークプラグ
用絶縁碍子であり、このスパークプラグ用絶縁碍子
（１）は、コルゲーション部（２）、絶縁体胴部（３）
及びその軸孔内において後端に配する端子電極と共に抵
抗体を挟持しつつ加熱、封着する導電性のガラスシール
材により中心電極を先端より突出して固持することとな
る絶縁体脚長部（４）から構成されるものである。BRIEF DESCRIPTION OF THE DRAWINGS FIG. (1) is an insulator for a spark plug which is an embodiment of the present invention. The insulator (1) for a spark plug comprises a corrugation portion (2) and an insulator body portion (3).
And the insulator leg long portion (4) which sticks the center electrode by projecting from the tip by a conductive glass sealing material that heats and seals the resistor together with the terminal electrode arranged at the rear end in the shaft hole. ).
【００１１】そして、スパークプラグ用絶縁碍子（１）
に使用されるアルミナ質セラミックスにおいては、セラ
ミックス構成成分より算出される密度に対する嵩密度
（相対密度）の比率（×１００％）を９８％以上の相対
密度とし、また上記アルミナ質セラミックスにおけるア
ルミナ（Ａｌ2 Ｏ3 ）の含有率を９０ｗｔ％以上とする
ものである。Insulators for spark plugs (1)
In the alumina ceramics used for, the ratio (× 100%) of the bulk density (relative density) to the density calculated from the ceramic constituent components is set to 98% or more relative density, and the alumina (Al The content of 2 O 3 ) is 90 wt% or more.
【００１２】この発明の第１実施例である内燃機関用ス
パークプラグに使用されるスパークプラグ用絶縁碍子
（１）は以上の構成を具えるので、セラミックス構成成
分より算出される密度に対する嵩密度の比率（×１００
％）を９８％以上の相対密度とすることにより、このス
パークプラグ用絶縁碍子（１）の有する熱伝導率が高め
られるので、内燃機関の高性能化に伴って増加する受熱
量に対するスパークプラグ用絶縁碍子（１）の放熱性を
十分に向上させることができることから、内燃機関の小
型化の要求に伴うスパークプラグを構成するスパークプ
ラグ用絶縁碍子（１）の小型化に起因する熱伝導率の低
下による放熱性の悪化に対応することができるものとな
ると共に、絶縁体脚長部（４）を長められることから耐
汚損性をも向上させることができる。Since the spark plug insulator (1) used in the spark plug for an internal combustion engine according to the first embodiment of the present invention has the above-described structure, it has a bulk density relative to a density calculated from the ceramic constituent components. Ratio (× 100
%) With a relative density of 98% or more, the thermal conductivity of the insulator (1) for spark plugs is increased, so that for spark plugs with respect to the amount of heat received that increases as the performance of the internal combustion engine increases. Since the heat dissipation of the insulator (1) can be sufficiently improved, the thermal conductivity due to the miniaturization of the spark plug insulator (1) constituting the spark plug in accordance with the demand for the miniaturization of the internal combustion engine is improved. In addition to being able to deal with the deterioration of heat dissipation due to the decrease, the insulator leg long portion (4) can be lengthened, so that the stain resistance can also be improved.
【００１３】また、上記スパークプラグ用絶縁碍子
（１）に使用されるアルミナ質セラミックスにおけるア
ルミナ（Ａｌ2 Ｏ3 ）の含有率を９０ｗｔ％以上とする
ことで、アルミナの含有率が９０ｗｔ％以下であるとア
ルミナ質セラミックスの熱伝導を阻害する原因となるア
ルミナの粒界相生成物の顕著な発生を抑制することがで
きるので、スパークプラグ用絶縁碍子（１）における熱
伝導をより確実に行うことができる。Further, by setting the content of alumina (Al 2 O 3 ) in the alumina ceramics used for the above-mentioned insulator (1) for spark plugs to be 90 wt% or more, the content of alumina is 90 wt% or less. If so, it is possible to suppress the remarkable generation of the grain boundary phase product of alumina, which causes the heat conduction of the alumina ceramics, so that the heat conduction in the insulator (1) for a spark plug should be performed more reliably. You can
【００１４】なお、上記実施例で説明したスパークプラ
グ用絶縁碍子（１）に使用されるアルミナ質セラミック
スを、半導体基板において使用することとしても、上記
スパークプラグ用絶縁碍子（１）と同様に、この半導体
基板の熱伝導率を高めて放熱性を十分に確保することが
できるようになると共に、熱伝導の阻害原因となるアル
ミナの粒界相生成物の顕著な発生を抑制して確実に熱伝
導を行うことができる。The alumina ceramics used for the spark plug insulator (1) described in the above embodiment may be used in a semiconductor substrate as in the spark plug insulator (1). It is possible to increase the thermal conductivity of this semiconductor substrate to ensure sufficient heat dissipation, and to suppress the remarkable generation of the grain boundary phase products of alumina, which is a cause of impeding heat conduction, to ensure the heat generation. Conduction is possible.
【００１５】また、上述した半導体基板のアルミナ質焼
結体又はスパークプラグ用絶縁碍子（１）において使用
されるアルミナ質セラミックスにおいては、アルミナ
（Ａｌ2 Ｏ3 ）を主成分とし、この主成分となるアルミ
ナ（Ａｌ2 Ｏ3 ）に対してＳｉ、Ｃａ若しくはＭｇの酸
化物或は炭酸塩、又はこれらの混合物を混合するアルミ
ナ質セラミックスを所定形状に成形した後、この成形物
を窒素又はアルゴンガス等の非酸化雰囲気中で１５００
〜１７００℃で焼結、或は加圧焼成させて製造してなる
ものである、。Further, in the alumina ceramics used in the above-mentioned alumina sintered body of the semiconductor substrate or the insulator (1) for spark plugs, alumina (Al 2 O 3 ) is the main component, and this main component is Alumina-based ceramics obtained by mixing an oxide or carbonate of Si, Ca or Mg, or a mixture thereof with alumina (Al 2 O 3 ) is formed into a predetermined shape, and then the formed product is subjected to nitrogen or argon gas. 1500 in non-oxidizing atmosphere
It is manufactured by sintering at 1700 ° C. or by firing under pressure.
【００１６】そこで、この発明の効果を確認するため
に、主成分であるアルミナ粉末（純度９９．０％以上、
平均粒径１．５μｍ）の配合量を８８．０，９０．０，
９３．０，及び９５．０ｗｔ％とした上ＳｉＯ2 、Ｃａ
ＣＯ3 及びＭｇＯ（いずれも平均粒径２μｍ以下、純度
９８．５％以上）を任意に配合し、バインダーとしての
ＰＶＡ（ポリビニールアルコール）を原料配合物１００
に対して１加え、適宜水分を添加した後、アルミナポッ
トにおいて１０時間混合した上で、これによりできあが
ったスラリーをスプレードドライヤーにより造粒し、造
粒粉末を得る。そして、この造粒粉末を、まずスパーク
プラグ用絶縁体素地成形用ラバープレスゴム型内に投入
し、中穴用中子を挿入し、上蓋を閉じて約１００ＭＰａ
の圧力で成形プレスすると共にしレジノイド砥石により
スパークプラグ用絶縁碍子に研削加工するものであり、
一方では内径φ５０の金型内で厚さ５ｍｍに成形してな
るものである。更に、このスパークプラグ用絶縁碍子
（１）及びφ５０、厚さ５ｍｍに成形された成形物を大
気中６００℃、１ｈｒ仮焼して脱バインダー工程を施し
た後にこの発明の実施例のように窒素ガスによる非酸化
雰囲気中で１５００〜１７００℃で焼結させてなるもの
であり（実施例１〜４）、またこの発明の実施例との比
較を行うため同様の成形物を大気中１５００〜１７００
℃で焼結を行い比較例５〜８を製造した。Therefore, in order to confirm the effect of the present invention, alumina powder as the main component (purity 99.0% or more,
The compounding amount of the average particle diameter of 1.5 μm) is 88.0, 90.0,
93.0, and after having a 95.0 wt% SiO 2, Ca
CO 3 and MgO (each having an average particle size of 2 μm or less and a purity of 98.5% or more) are arbitrarily blended, and PVA (polyvinyl alcohol) as a binder is used as the raw material blend 100.
After adding 1 to the above and adding water appropriately, the mixture is mixed in an alumina pot for 10 hours, and the slurry thus formed is granulated by a spray dryer to obtain a granulated powder. Then, this granulated powder is first put into a rubber press rubber mold for forming an insulator base for a spark plug, a core for a hole is inserted, and the upper lid is closed to about 100 MPa.
Forming and pressing with the pressure of, and grinding into insulator for spark plug with resinoid grindstone,
On the other hand, it is formed to have a thickness of 5 mm in a mold having an inner diameter of φ50. Further, this insulator for spark plug (1) and a molded product molded to a diameter of 50 mm and a diameter of 50 mm were calcined at 600 ° C. for 1 hr in the atmosphere and subjected to a binder removal step, and then subjected to nitrogen removal as in the embodiment of the present invention. It is obtained by sintering at 1500 to 1700 ° C. in a non-oxidizing atmosphere of gas (Examples 1 to 4), and a similar molded product is made to be 1500 to 1700 in the air for comparison with the examples of the present invention.
Comparative Examples 5-8 were manufactured by sintering at ℃.
【００１７】その上で、嵩密度はφ５０ｍｍの円板のテ
ストピースを用いてアルキメデス法により求めた。機械
強度は上記テストピースより幅×厚さ×長さ＝４ｍｍ×
３ｍｍ×５ｍｍの角棒テストピースを切り出し、＃６０
０以上の砥石により面取りを行った上で４点曲げにより
強度を測定して求めた。絶縁性は端子電極及び中心電極
を軸孔内に保持するスパークプラグ用絶縁碍子を主体金
具に組付けたスパークプラグを７００℃の大気中に保持
し、２０分後に端子電極と主体金具間に高絶縁抵抗計
（１０００Ｖ印加）により測定し、また熱伝導率はφ５
０ｍｍのテストピースからφ１０、厚さ２ｍｍの円板を
切り出して両面を研削後レーザーフラッシュ法により常
温（２５℃）での熱伝導率を求めた。更にその他の化学
成分はφ５０ｍｍのテストピースの円板形状品を蛍光Ｘ
線による検量法によって測定したものである。その結果
を示した図２により、セラミックス構成成分より算出さ
れる密度に対する嵩密度の比率（×１００％）を９８％
以上の相対密度とすることにより熱伝導率が向上する一
方で、機械強度及び絶縁性の低下が見られず、またアル
ミナの含有率が９０ｗｔ％以下であると、このような効
果が得られないことから十分にこの発明の効果が確認さ
れた。Further, the bulk density was determined by the Archimedes method using a disc test piece of φ50 mm. The mechanical strength of the above test piece is width x thickness x length = 4 mm x
Cut out a 3mm x 5mm square bar test piece, # 60
After chamfering with a grindstone of 0 or more, the strength was measured by four-point bending and determined. Insulation is achieved by keeping the spark plug, which is the insulator for the spark plug that holds the terminal electrode and the center electrode in the shaft hole, in the metal shell in the atmosphere at 700 ° C, and after 20 minutes, make sure that the height between the terminal electrode and the metal shell is high. Measured with an insulation resistance meter (1000V applied), and the thermal conductivity is φ5.
A disk having a diameter of 10 mm and a thickness of 2 mm was cut out from a 0 mm test piece, both surfaces were ground, and the thermal conductivity at room temperature (25 ° C.) was determined by the laser flash method. For other chemical components, a disk-shaped test piece with a diameter of 50 mm is fluorescent X
It is measured by a calibration method using a line. According to FIG. 2 showing the result, the ratio of the bulk density to the density calculated from the ceramic constituent components (× 100%) is 98%.
With the above relative densities, the thermal conductivity is improved, but the mechanical strength and the insulating property are not deteriorated, and if the alumina content is 90 wt% or less, such an effect cannot be obtained. Therefore, the effect of the present invention was sufficiently confirmed.
【００１８】そして、図３においては、この発明の実施
例であるスパークプラグ用絶縁碍子（１）の軸孔内に端
子電極及び中心電極を固着した絶縁端子を主体金具に組
付けたスパークプラグを４サイクル、単気筒、２５０ｃ
ｃの実機に装着した上でプレイグニッションテストをお
こなったところ、耐熱性が５°〜７．５°向上した結果
スパークプラグのワイド化を図ることができるものとな
ることが明かとなり、この発明の効果が十分に確認され
た。In FIG. 3, there is shown a spark plug in which an insulating terminal having a terminal electrode and a center electrode fixed in a shaft hole of a spark plug insulator (1) according to an embodiment of the present invention is attached to a metal shell. 4 cycles, single cylinder, 250c
When a preignition test was carried out after mounting it on the actual machine of c, it became clear that the heat resistance was improved by 5 ° to 7.5 ° and the spark plug could be widened. The effect was fully confirmed.
【００１９】[0019]
【発明の効果】以上のとおり、アルミナ質セラミックの
有する諸特性を損なうことなく熱伝導率を高めて放熱性
を確実に向上させつつ耐汚損性を改善することができる
と共に、耐プレイグニッション性の向上によるスパーク
プラグのワイド化を図ることもできる優れた効果を有す
るものである。As described above, the thermal conductivity can be increased without impairing the various properties of the alumina-based ceramic to improve the heat dissipation and the stain resistance can be improved, and the pre-ignition resistance can be improved. This has an excellent effect that the spark plug can be widened due to the improvement.
【図１】この発明の実施例であるスパークプラグ用絶縁
碍子の正面図である。FIG. 1 is a front view of an insulator for a spark plug which is an embodiment of the present invention.
【図２】この発明の実施例であるアルミナ質セラミック
スにおける熱伝導率の測定結果等を示すものである。FIG. 2 shows the measurement results of the thermal conductivity of the alumina ceramics which is an example of the present invention.
【図３】この発明の実施例であるスパークプラグ用絶縁
碍子を使用したスパークプラグの実機による耐熱テスト
の結果である。FIG. 3 is a result of a heat resistance test by an actual machine of a spark plug using the insulator for a spark plug according to the embodiment of the present invention.
１ スパークプラグ用絶縁碍子 ２ コルゲーション部 ３ 絶縁体胴部 ４ 絶縁体脚長部 1 Insulator for spark plug 2 Corrugation part 3 Insulator body 4 Insulator leg long part
Claims (3)
ミックス構成成分より算出される密度に対する嵩密度の
比率（×１００％）を９８％以上（相対密度）としてな
るアルミナ質焼結体又はスパークプラグ用絶縁碍子。1. An alumina-based sintered body or an insulator for a spark plug, wherein the ratio of the bulk density to the density calculated from the ceramic constituents (× 100%) is 98% or more (relative density) in the alumina-based ceramics.
ルミナ（Ａｌ2 Ｏ3）の含有率を９０ｗｔ％以上として
なる請求項１記載のアルミナ質焼結体又はスパークプラ
グ用絶縁碍子。2. An alumina sintered body or an insulator for a spark plug according to claim 1, wherein the content of alumina (Al 2 O 3 ) in the alumina ceramic is 90 wt% or more.
これにＳｉ、Ｃａ若しくはＭｇの酸化物或は炭酸塩、又
はこれらの混合物を混合するアルミナ質セラミックスを
所定形状に成形した後、この成形物を窒素又はアルゴン
ガス等の非酸化雰囲気中で１５００〜１７００℃で焼結
せしめてなるアルミナ質焼結体又はスパークプラグ用絶
縁碍子の製造方法。3. Alumina (Al 2 O 3 ) as a main component,
An oxide or carbonate of Si, Ca, or Mg, or an alumina ceramic mixed with a mixture thereof is molded into a predetermined shape, and the molded product is heated to 1500 to 500 in a non-oxidizing atmosphere such as nitrogen or argon gas. A method for manufacturing an alumina-based sintered body or an insulator for a spark plug which is sintered at 1700 ° C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8154781A JPH09315849A (en) | 1996-05-28 | 1996-05-28 | Aluminous sintered compact or insulator for spark plug and its production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8154781A JPH09315849A (en) | 1996-05-28 | 1996-05-28 | Aluminous sintered compact or insulator for spark plug and its production |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09315849A true JPH09315849A (en) | 1997-12-09 |
Family
ID=15591768
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8154781A Pending JPH09315849A (en) | 1996-05-28 | 1996-05-28 | Aluminous sintered compact or insulator for spark plug and its production |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09315849A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999044266A1 (en) * | 1998-02-27 | 1999-09-02 | Ngk Spark Plug Co., Ltd. | Spark plug, alumina insulator for spark plug, and method of manufacturing the same |
| JP2000247729A (en) * | 1999-02-23 | 2000-09-12 | Ngk Spark Plug Co Ltd | Alumina base sintered compact |
| JP2001002464A (en) * | 1998-11-24 | 2001-01-09 | Ngk Spark Plug Co Ltd | High-voltage-withstanding aluminous sintered compact and its production |
| JP2001048637A (en) * | 1999-08-04 | 2001-02-20 | Ngk Spark Plug Co Ltd | Alumina-base sintered body and its production |
| JP2009242234A (en) * | 1998-11-24 | 2009-10-22 | Ngk Spark Plug Co Ltd | Insulator for spark plug, method of manufacturing the same and spark plug using the same |
-
1996
- 1996-05-28 JP JP8154781A patent/JPH09315849A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999044266A1 (en) * | 1998-02-27 | 1999-09-02 | Ngk Spark Plug Co., Ltd. | Spark plug, alumina insulator for spark plug, and method of manufacturing the same |
| US6407487B1 (en) | 1998-02-27 | 2002-06-18 | Ngk Spark Plug Co., Ltd. | Spark plug, alumina insulator for spark plug, and method of manufacturing the same |
| US6632381B2 (en) | 1998-02-27 | 2003-10-14 | Ngk Spark Plug Co., Ltd. | Production process for alumina based insulator |
| JP2001002464A (en) * | 1998-11-24 | 2001-01-09 | Ngk Spark Plug Co Ltd | High-voltage-withstanding aluminous sintered compact and its production |
| JP2009242234A (en) * | 1998-11-24 | 2009-10-22 | Ngk Spark Plug Co Ltd | Insulator for spark plug, method of manufacturing the same and spark plug using the same |
| JP2000247729A (en) * | 1999-02-23 | 2000-09-12 | Ngk Spark Plug Co Ltd | Alumina base sintered compact |
| JP2001048637A (en) * | 1999-08-04 | 2001-02-20 | Ngk Spark Plug Co Ltd | Alumina-base sintered body and its production |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US20060186780A1 (en) | Alumina-based ceramic composition and spark plug using the same | |
| JP2883787B2 (en) | Substrate for power semiconductor device | |
| JPH0712969B2 (en) | Alumina porcelain and spark plug | |
| CN109592984A (en) | A kind of highly thermally conductive, high resistance liquid phase sintering silicon carbide ceramic and preparation method thereof | |
| JP4571728B2 (en) | Silicon nitride sintered body and manufacturing method thereof | |
| JPH09315849A (en) | Aluminous sintered compact or insulator for spark plug and its production | |
| JPS62132765A (en) | Manufacture of high insulation high alumina base ceramic composition | |
| TW202023995A (en) | Potting composition, electrically insulated electrical or electronic component and process for electrical insulation thereof | |
| US9653888B2 (en) | Spark plug | |
| JPH04160061A (en) | Oxynitride ceramic sintered body and spark plug | |
| JPS62187156A (en) | Manufacture of high insulation high alumina ceramic composition | |
| US5760532A (en) | Sintered ceramic body for a spark plug | |
| JP2000128643A (en) | Highly heat conductive silicon nitride-based sintered compact and its production | |
| JP3076916B2 (en) | Spark plug | |
| JP4995863B2 (en) | Insulator for spark plug, method for manufacturing the same, and spark plug using the same | |
| JP4591738B2 (en) | Silicon nitride sintered body | |
| JP2011154908A (en) | Spark plug, insulator for the same, and its manufacturing method | |
| JPH02184572A (en) | Silicon nitride ceramic having devitrified inner granular phase and preparation thereof | |
| JP4859079B2 (en) | Spark plug insulator and spark plug using the same | |
| JPS62171958A (en) | Manufacture of high insulation high alumina ceramic composition | |
| WO2023008300A1 (en) | Insulating body and spark plug | |
| JPH0717459B2 (en) | Method for producing highly insulating and highly alumina-based porcelain composition | |
| JPH075378B2 (en) | Black aluminum nitride sintered body and manufacturing method thereof | |
| JP2587854B2 (en) | Method for producing aluminum nitride sintered body with improved thermal conductivity | |
| JP2000272958A (en) | Insulating material for spark plug, its production and spark plug using the same |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20040816 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20041214 |
|
| A521 | Written amendment |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20050214 |
|
| A02 | Decision of refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A02 Effective date: 20050517 |