JPH0498783A - Insulating insulator of spark plug - Google Patents
Insulating insulator of spark plugInfo
- Publication number
- JPH0498783A JPH0498783A JP21215390A JP21215390A JPH0498783A JP H0498783 A JPH0498783 A JP H0498783A JP 21215390 A JP21215390 A JP 21215390A JP 21215390 A JP21215390 A JP 21215390A JP H0498783 A JPH0498783 A JP H0498783A
- Authority
- JP
- Japan
- Prior art keywords
- boron nitride
- insulator
- nitride
- spark plug
- additive
- 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 description 21
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 claims abstract description 26
- 229910052582 BN Inorganic materials 0.000 claims abstract description 24
- 238000005245 sintering Methods 0.000 claims abstract description 13
- 229910052784 alkaline earth metal Inorganic materials 0.000 claims abstract description 10
- 239000000654 additive Substances 0.000 claims abstract description 9
- 230000000996 additive effect Effects 0.000 claims abstract description 8
- 150000004767 nitrides Chemical class 0.000 claims abstract description 8
- 239000000919 ceramic Substances 0.000 claims abstract description 6
- 229910019142 PO4 Inorganic materials 0.000 claims abstract description 3
- 238000009413 insulation Methods 0.000 claims description 13
- 239000002994 raw material Substances 0.000 claims description 11
- 238000010304 firing Methods 0.000 claims description 8
- 150000001342 alkaline earth metals Chemical class 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 4
- 230000001590 oxidative effect Effects 0.000 claims description 3
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims description 2
- 150000001242 acetic acid derivatives Chemical class 0.000 claims description 2
- 229910052796 boron Inorganic materials 0.000 claims description 2
- 150000004649 carbonic acid derivatives Chemical class 0.000 claims description 2
- 150000001805 chlorine compounds Chemical class 0.000 claims description 2
- 150000002222 fluorine compounds Chemical class 0.000 claims description 2
- 150000004679 hydroxides Chemical class 0.000 claims description 2
- 238000002156 mixing Methods 0.000 claims description 2
- 238000000465 moulding Methods 0.000 claims description 2
- 150000002823 nitrates Chemical class 0.000 claims description 2
- 150000003891 oxalate salts Chemical class 0.000 claims description 2
- 235000021317 phosphate Nutrition 0.000 claims description 2
- 150000003013 phosphoric acid derivatives Chemical class 0.000 claims description 2
- 150000003467 sulfuric acid derivatives Chemical class 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 5
- QTBSBXVTEAMEQO-UHFFFAOYSA-M Acetate Chemical compound CC([O-])=O QTBSBXVTEAMEQO-UHFFFAOYSA-M 0.000 abstract 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 abstract 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 abstract 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 abstract 1
- 229910002651 NO3 Inorganic materials 0.000 abstract 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 abstract 1
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 abstract 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 abstract 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 abstract 1
- 239000010452 phosphate Substances 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 6
- 239000011575 calcium Substances 0.000 description 5
- 150000001875 compounds Chemical class 0.000 description 5
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 4
- 229910052791 calcium Inorganic materials 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 229910052788 barium Inorganic materials 0.000 description 2
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000010292 electrical insulation Methods 0.000 description 2
- 229910052712 strontium Inorganic materials 0.000 description 2
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 1
- 101150109958 CAPN5 gene Proteins 0.000 description 1
- 102100030006 Calpain-5 Human genes 0.000 description 1
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- -1 calcium aluminate compound Chemical class 0.000 description 1
- 238000005229 chemical vapour deposition Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 230000008034 disappearance Effects 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
Landscapes
- Spark Plugs (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、内燃機関のスパークプラグの絶縁碍子に関す
る。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an insulator for a spark plug for an internal combustion engine.
［従来の技術］
特公昭５５−４６６３４号公報には、スパークプラグの
絶縁碍子に窒化アルミニウムを用いてワイドレンジ化を
図った技術が記載されている。[Prior Art] Japanese Patent Publication No. 55-46634 describes a technique in which aluminum nitride is used for the insulator of a spark plug to achieve a wide range.
［発明が解決しようとする課題］
しかるに、このようなスパークプラグは、熱により窒化
アルミニウムの絶縁抵抗が低下して火花エネルギーが絶
縁碍子の内部を流れ、失火しやすいという欠点がある。[Problems to be Solved by the Invention] However, such spark plugs have the disadvantage that the insulation resistance of the aluminum nitride decreases due to heat, causing spark energy to flow inside the insulator, making it easy to misfire.
本発明の目的は、ワイドレンジ化が図れ、かつ使用時に
失火が起こり難いスパークプラグの絶縁碍子の提供にあ
る。An object of the present invention is to provide an insulator for a spark plug that has a wide range and is less likely to misfire during use.
「課題を解決するための手段］
上記課題の達成のため、本発明は以上の構成を採用した
。"Means for Solving the Problems" In order to achieve the above problems, the present invention employs the above configuration.
（１）窒化物系セラミック原料と、アルカリ土類金属の
、酸化物、塩化物、水酸化物、弗化物、硫酸塩、炭酸塩
、硝酸塩、酢酸塩、燐酸塩、蓚酸塩の内から一つまたは
二つ以上選んでなる焼結助剤と、添加物としての窒化硼
素とを調合し、成形後、１５５０〜１９５０℃の非酸化
雰囲気中で焼成してなるスパークプラグの絶縁碍子であ
って、上記焼結体中のアルカリ土類金属をその酸化物に
換算して０．５〜１０重量％とし、焼結体中の窒化硼素
の含有を０．５〜１０重量％とじた。(1) Nitride-based ceramic raw material and one of the following: oxides, chlorides, hydroxides, fluorides, sulfates, carbonates, nitrates, acetates, phosphates, and oxalates of alkaline earth metals Alternatively, an insulator for a spark plug is prepared by mixing two or more selected sintering aids and boron nitride as an additive, molding the mixture, and then firing it in a non-oxidizing atmosphere at 1550 to 1950°C, The content of the alkaline earth metal in the sintered body was 0.5 to 10% by weight in terms of its oxide, and the content of boron nitride in the sintered body was 0.5 to 10% by weight.
（２）さらに、添加物の窒化硼素を、パイロリティック
・ボロン・ナイトライドにした。(2) Furthermore, the additive boron nitride was changed to pyrolytic boron nitride.
（３）上記成形体の外周に窒化硼素を担持して上記焼成
を行う。(3) Carrying boron nitride on the outer periphery of the molded body and performing the firing.
［作用および発明の効果］
〈請求項１の作用）
焼結助剤は、成形物が焼成する過程で、アルミナとの化
合物（電気絶縁性大）に組み変わり、粒界相を形成しな
がら窒化物系セラミック原料の焼結に寄与する。なお、
焼結体中のアルカリ土類金属がその酸化物に換算して０
５重量％未満である場合には、焼結性に劣っており、絶
縁碍子の高温での絶縁性も低い。１０重量％を越えてい
る場合は剰軟な助剤の分解発泡による有害なピンホール
を焼結体内に残している。[Actions and Effects of the Invention] (Actions of Claim 1) During the firing process of the molded product, the sintering aid is recombined into a compound with alumina (highly electrically insulating) and undergoes nitridation while forming a grain boundary phase. Contributes to the sintering of physical ceramic raw materials. In addition,
The alkaline earth metal in the sintered body is 0 in terms of its oxide.
If it is less than 5% by weight, the sintering properties are poor and the insulating properties of the insulator at high temperatures are also low. If it exceeds 10% by weight, harmful pinholes are left in the sintered body due to decomposition and foaming of the excessively soft auxiliary agent.
窒化硼素は、絶縁碍子の熱伝導率を著しく低下させずに
高温での絶縁性向上に寄与する。なお、焼結体中の窒化
硼素が焼結体の０．５重量％未満である場合は上記絶縁
性向上効果が顕著に現れず、１０重量％を越えている場
合は吸水性を帯びる。Boron nitride contributes to improving the insulation properties at high temperatures without significantly reducing the thermal conductivity of the insulator. It should be noted that if boron nitride in the sintered body is less than 0.5% by weight of the sintered body, the above-mentioned insulation improvement effect will not be noticeable, and if it exceeds 10% by weight, the sintered body will have water absorption properties.
１５５０〜１９５０℃の非酸化雰囲気が成形体の焼結に
適する。A non-oxidizing atmosphere of 1550-1950°C is suitable for sintering the compact.
（請求項１の効果）
絶縁碍子は熱伝導性に優れるので該絶縁碍子を用いて容
易にワイドレンジなスパークプラグが製造できる。(Effect of Claim 1) Since the insulator has excellent thermal conductivity, a wide range of spark plugs can be easily manufactured using the insulator.
絶縁碍子は高温での電気絶縁性に優れるので、該絶縁碍
子を用いて製造したスパークプラグは、絶縁碍子の絶縁
性不足に起因する失火を起こさない
（請求項２の作用効果）
窒ｒ１１．硼素をパイロリティック・ポロン・ナイトラ
イドに限定すれば、さらに、絶縁碍子の高温での電気絶
縁性を向上させることができる。Since the insulator has excellent electrical insulation properties at high temperatures, a spark plug manufactured using the insulator will not cause a misfire due to insufficient insulation of the insulator (effect of claim 2) Nitrogen r11. If boron is limited to pyrolytic poron nitride, the electrical insulation properties of the insulator at high temperatures can be further improved.
（請求項３の作用効果）
焼成時に、上記焼結助剤の分解消失を防止できるので、
焼結助剤が無駄にならない。(Operation and effect of claim 3) Since decomposition and disappearance of the sintering aid can be prevented during firing,
No sintering aid is wasted.
［実施例］
つぎに、本発明の実施例を第１表、第２表、および第１
図に基づいて説明する。[Example] Next, Examples of the present invention are shown in Table 1, Table 2, and Table 1.
This will be explained based on the diagram.
焼結助剤は、アルカリ土類金属である、カルシウム（Ｃ
ａ）、バリウム（Ｂａ） 、ストロンチウム（Ｓｒ）の
、酸化物、塩化物、水酸化物、弗化物、硫酸塩、炭酸塩
、硝酸塩、酢酸塩、ｆＪ酸塩、蓚酸塩の内から−っまた
は二つ以上選んでなる、Ｃａ化合物、Ｓｒ化合物、Ｂａ
化合物を用いた。The sintering aid is calcium (C), which is an alkaline earth metal.
or Ca compound, Sr compound, Ba selected from two or more
A compound was used.
窒化物系セラミック原料は、平均粒径１．５μｍの窒化
アルミニウム（ＡρＮ）粉末である。The nitride-based ceramic raw material is aluminum nitride (AρN) powder with an average particle size of 1.5 μm.
添加物および担持する窒化硼素は、精度５μｍ以下が８
０重量％のものである。The accuracy of additives and supported boron nitride is 8 μm or less.
0% by weight.
パイロリティック・ホロン・ナイトライド（以下ＰＢＮ
と記載）は、窒化硼素をＣＶＤ法により結晶化、育成し
たものあり、結晶化度の高さに優れ、特にＣ軸方向の絶
縁性が大方晶系のものに比べ優れたものである。Pyrolytic Holon Nightride (PBN)
) is obtained by crystallizing and growing boron nitride by the CVD method, and has an excellent degree of crystallinity, and in particular has superior insulation properties in the C-axis direction compared to macrogonal crystals.
つぎに、テストピース１の製造方法を述べる。Next, a method for manufacturing test piece 1 will be described.
なお、第１表に示す絶縁抵抗（７００’Ｃ）は、第１図
に示すように、テストピース１を挟んで、黄銅製の電極
１００（当接面６Ｒ）、２００を配置し、ヒータ３００
でテストピース１を７００”Ｃに加熱して、５ｏｏＶ
Ｄｃの絶縁抵抗計４００で測定して求めた。Note that the insulation resistance (700'C) shown in Table 1 is determined by placing brass electrodes 100 (contact surface 6R) and 200 on both sides of the test piece 1, and placing a heater 300 on both sides of the test piece 1, as shown in FIG.
Heat test piece 1 to 700"C and 5ooV
It was determined by measuring with a Dc insulation resistance meter 400.
（１）上記窒化アルミニウム粉末、焼結助剤、テストピ
ースＮα１〜ＮＣｌ３以外については窒化硼素（又はＰ
ＢＮ）も添加し、これらをエタノール中で混合する。な
お、窒化硼素、ＰＢＮはほぼ原料添加量と同等量が焼結
体中に残留（第１表に示す）するが、焼結助剤が焼結体
中に酸化物として残留（第１表に示す）するのは原料粉
末の３０〜，７０重量％である。(1) Boron nitride (or P
BN) and mix them in ethanol. Note that boron nitride and PBN remain in the sintered body in an amount roughly equivalent to the amount added to the raw materials (shown in Table 1), but sintering aids remain in the sintered body as oxides (shown in Table 1). (shown) accounts for 30 to 70% by weight of the raw material powder.
（２）つぎに、得られたスラリーを噴霧乾燥し、これを
直径５０ｍｍ、厚さ２．５ｍｍの円盤状に金型プレス成
形する。(2) Next, the obtained slurry is spray-dried and press-molded into a disk shape with a diameter of 50 mm and a thickness of 2.5 mm.
（３）この成形体を酸化仮焼（５００°ＣＸ２時間）し
、静水圧プレス（Ｉｔ／ｃｍ２）する。(3) This compact is oxidized and calcined (500°C for 2 hours) and isostatically pressed (It/cm2).
（４）窒化硼素とエタノールとを混合し、これを上記仮
焼体に塗布する（騎１９．２０は除く）。(4) Mix boron nitride and ethanol and apply this to the above calcined body (except for 19.20).
（５）これを、常圧、窒素ガス雰囲気中、第１表、第２
表の焼成条件で焼成し、得られた焼結体を研磨して直径
４０ｍｍ、厚さ１．０ｍｍの円盤状のテストピース１（
試料Ｎｕｌ〜Ｎｃ２２）にする。(5) Test this in Table 1 and 2 at normal pressure and in a nitrogen gas atmosphere.
Firing was performed under the firing conditions shown in the table, and the resulting sintered body was polished to form a disk-shaped test piece 1 (
Samples Nul to Nc22).
つぎに、実施例の作用効果について述べる。Next, the effects of the embodiment will be described.
（ア）カルシウム、ストロンチウム、バリウムの各化合
物は、上記（５）の焼成過程で窒化珪素中のアルミニウ
ム酸化物と反応し粒界層を形成する。(a) Each compound of calcium, strontium, and barium reacts with aluminum oxide in silicon nitride in the firing process of (5) above to form a grain boundary layer.
例えばカルシウムならば粒界層はアルミン酸カルシウム
化合物（電気絶縁性大）で構成される。これら粒界層は
高温（７００℃程度）でも電気抵抗が高いので、テスト
ピース１の絶縁抵抗を高くできる（窒化硼素を添加して
いない馳１〜ＮＣＬ３を参照）。For example, in the case of calcium, the grain boundary layer is composed of a calcium aluminate compound (highly electrically insulating). Since these grain boundary layers have high electrical resistance even at high temperatures (about 700° C.), the insulation resistance of test piece 1 can be increased (see Test Pieces 1 to NCL3 to which boron nitride is not added).
ここで、添加剤の窒化硼素が添加されていると、上記粒
界層の高温絶縁抵抗が著しく向上（Ｐ２Ｏ，４〜順９を
参照）する。しかし、添加量が多く、焼結体中に１０重
量％を越えて占める場合（Ｎα１３．１５．１７）は吸
水性を有するようになり、０゜５重量％未満では絶縁抵
抗（７００℃）が高くならない。なお、窒化硼素の熱伝
導率は約８５Ｗ／ｍ−にであり、また少量用いるだけな
ので、窒化アルミニウム（約３００Ｗ／ｍ −ｋ ）の
良熱伝導性を著しく損ねない。Here, when the additive boron nitride is added, the high temperature insulation resistance of the grain boundary layer is significantly improved (see P2O, 4 to 9). However, if the amount added is large and exceeds 10% by weight in the sintered body (Nα13.15.17), it will have water absorption properties, and if it is less than 0.5% by weight, the insulation resistance (700℃) will decrease. It doesn't get expensive. The thermal conductivity of boron nitride is approximately 85 W/m-k, and since only a small amount is used, the good thermal conductivity of aluminum nitride (approximately 300 W/m-k) is not significantly impaired.
（イ）添加物の窒化硼素をＰＢＮにすると、Ｎα１０、
Ｎα１１に示すように、絶縁抵抗（７００℃）の向上の
点で有利となる。(a) When the additive boron nitride is PBN, Nα10,
As shown by Nα11, this is advantageous in terms of improving insulation resistance (700° C.).
（つ）第２表の社１９．２０と、１１１ｃ１８．２１．
２２との比較で明らかなように、上記（４）の作業を施
すことにより、焼結助剤の残留率を高めることができ、
原料粉末を有効に利用することができる。(1) Company 19.20 in Table 2 and 111c18.21.
As is clear from the comparison with No. 22, by carrying out the operation in (4) above, the residual rate of the sintering aid can be increased,
Raw material powder can be used effectively.
（１）試料ＮＧ４〜ＮＱ９．１１１０． Ｎａｌ ＬＮ
０１８〜Ｎα２２のテストピース１と同じ材料で、スパ
ークプラグの絶縁碍子を製造し、この絶縁碍子の軸孔内
に中心電極を公知の方法であるガラスシールを用いて抵
抗体、端子電極とともに封着し、これを°、取付ねじを
備えた主体金具に組み付けたところ、ワイドレンジで、
がっ失火が起こらないスパークプラグが得られることが
判明した。(1) Samples NG4 to NQ9.1110. Nal LN
A spark plug insulator is manufactured using the same material as test piece 1 of 018 to Nα22, and a center electrode is sealed in the shaft hole of this insulator along with a resistor and a terminal electrode using a glass seal, which is a known method. When this was assembled into a main metal fitting equipped with mounting screws, a wide range of
It has been found that a spark plug that does not cause misfires can be obtained.
本発明は上記実施例以外にっぎの実施態様を含む。The present invention includes embodiments other than the above embodiments.
３０本明細書では、窒化物系セラミック原料は、窒化ア
ルミニウム等の窒化物原料のほが、酸窒化アルミニウム
（ＡＪ ＯＮ）等の酸窒化物原料やサイアロンの原料も
含む。30 In this specification, nitride-based ceramic raw materials include not only nitride raw materials such as aluminum nitride, but also oxynitride raw materials such as aluminum oxynitride (AJON), and Sialon raw materials.
ｂ、アルカリ土類金属には、カルシウム、ストロンチウ
ム、バリウムが好適である。b. Calcium, strontium, and barium are suitable for the alkaline earth metal.
（以下余白） ５０と；［(Margin below) 50 and; [
第１図はテストピースの高温絶縁抵抗を測定する装置の
説明図である。
図中 １・・・テストピース（スパークプラグの絶縁碍
子）FIG. 1 is an explanatory diagram of an apparatus for measuring high temperature insulation resistance of a test piece. In the diagram 1...Test piece (spark plug insulator)
Claims (1)
物、硫酸塩、炭酸塩、硝酸塩、酢酸塩、燐酸塩、蓚酸塩
の内から一つまたは二つ以上選んでなる焼結助剤と、 添加物としての窒化硼素と を調合し、成形後、１５５０〜１９５０℃の非酸化雰囲
気中で焼成してなるスパークプラグの絶縁碍子であって
、 上記焼結体中のアルカリ土類金属をその酸化物に換算し
て０．５〜１０重量％とし、焼結体中の窒化硼素の含有
を０．５〜１０重量％としたことを特徴とするスパーク
プラグの絶縁碍子。 ２）添加物の窒化硼素は、パイロリティック・ボロン・
ナイトライドである請求項１記載のスパークプラグの絶
縁碍子。 ３）上記成形体の外周に窒化硼素を担持して上記焼成を
行う請求項１または請求項２記載のスパークプラグの絶
縁碍子。[Claims] 1) Nitride-based ceramic raw materials and oxides, chlorides, hydroxides, fluorides, sulfates, carbonates, nitrates, acetates, phosphates, and oxalates of alkaline earth metals. Spark plug insulation is obtained by mixing a sintering aid selected from one or more of the following and boron nitride as an additive, molding the mixture, and firing it in a non-oxidizing atmosphere at 1550 to 1950°C. An insulator, wherein the alkaline earth metal in the sintered body is 0.5 to 10% by weight in terms of its oxide, and the content of boron nitride in the sintered body is 0.5 to 10% by weight. A spark plug insulator that is characterized by: 2) The additive boron nitride is pyrolytic boron.
The insulator for a spark plug according to claim 1, which is nitride. 3) The insulator for a spark plug according to claim 1 or 2, wherein the sintering is carried out with boron nitride supported on the outer periphery of the molded body.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21215390A JPH0498783A (en) | 1990-08-11 | 1990-08-11 | Insulating insulator of spark plug |
| BR9103482A BR9103482A (en) | 1990-08-11 | 1991-08-09 | IGNITION CANDLE ISOLATOR |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21215390A JPH0498783A (en) | 1990-08-11 | 1990-08-11 | Insulating insulator of spark plug |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0498783A true JPH0498783A (en) | 1992-03-31 |
Family
ID=16617775
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21215390A Pending JPH0498783A (en) | 1990-08-11 | 1990-08-11 | Insulating insulator of spark plug |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPH0498783A (en) |
| BR (1) | BR9103482A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0622881A2 (en) * | 1993-04-26 | 1994-11-02 | Ngk Spark Plug Co., Ltd | A spark plug insulator a method of making the same |
-
1990
- 1990-08-11 JP JP21215390A patent/JPH0498783A/en active Pending
-
1991
- 1991-08-09 BR BR9103482A patent/BR9103482A/en unknown
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0622881A2 (en) * | 1993-04-26 | 1994-11-02 | Ngk Spark Plug Co., Ltd | A spark plug insulator a method of making the same |
| EP0622881A3 (en) * | 1993-04-26 | 1994-11-17 | Ngk Spark Plug Co | A spark plug insulator a method of making the same. |
| US5508582A (en) * | 1993-04-26 | 1996-04-16 | Ngk Spark Plug Co., Ltd. | Spark plug insulator for use in internal combustion engine |
Also Published As
| Publication number | Publication date |
|---|---|
| BR9103482A (en) | 1992-05-12 |
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