JP3017273B2 - Ceramic heater - Google Patents
Ceramic heaterInfo
- Publication number
- JP3017273B2 JP3017273B2 JP2301812A JP30181290A JP3017273B2 JP 3017273 B2 JP3017273 B2 JP 3017273B2 JP 2301812 A JP2301812 A JP 2301812A JP 30181290 A JP30181290 A JP 30181290A JP 3017273 B2 JP3017273 B2 JP 3017273B2
- Authority
- JP
- Japan
- Prior art keywords
- sintered body
- electrode lead
- ceramic sintered
- ceramic
- ceramic heater
- 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.)
- Expired - Fee Related
Links
Landscapes
- Resistance Heating (AREA)
Description
【発明の詳細な説明】 ［産業上の利用分野］ この発明は、絶縁性のセラミック内に電気抵抗線を埋
設し、この抵抗線に通電し発熱させるセラミックヒータ
に関する。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ceramic heater in which an electric resistance wire is buried in an insulating ceramic, and the resistance wire is energized to generate heat.
［従来の技術］ 窒化珪素質など非酸化物系セラミック製で、棒状また
は板状を呈する焼結体中に、タングステン、タングステ
ン−レニウム合金、モリブデン等の発熱抵抗線を埋設し
てなるセラミックヒータが、内熱機関の予熱プラグ、ガ
ス燃焼機器の点火装置などに用いられている。[Prior Art] A ceramic heater made of a non-oxide ceramic such as silicon nitride and having a rod-shaped or plate-shaped sintered body in which a heating resistance wire such as tungsten, tungsten-rhenium alloy, molybdenum or the like is embedded. It is used for preheating plugs of internal heat engines, ignition devices for gas combustion equipment, and the like.
このセラミックヒータは、第６図Ａ、Ｂ、Ｃに示すご
とく、未焼結セラミック成形体200中に、高融点金属か
らなる発熱抵抗線300を、その両端部310、320が前記セ
ラミック成形体の表面部に位置しかつ表面に平行するよ
う埋設し、焼成後その表面を研磨して前記両端部を露出
させ、外部接続用端子面300A、300Bを形成する。この外
部接続用端子面には電気端子がろう付けされる。As shown in FIGS. 6A, 6B and 6C, this ceramic heater includes a heating resistor wire 300 made of a high melting point metal in an unsintered ceramic compact 200, and both ends 310 and 320 of the ceramic compact. It is buried so as to be positioned on the surface and parallel to the surface, and after baking, the surface is polished to expose both ends, thereby forming external connection terminal surfaces 300A and 300B. Electric terminals are brazed to the external connection terminal surfaces.
発熱抵抗線300は、実際に発熱に寄与する中間から先
端部分は、直径0.2mm程度の細線である発熱コイルを用
い、発熱させたくない前記両端部を含む両側部は、幾分
太い0.3〜0.4mmの電極リード棒で形成している。この電
極リード棒の後端部は前記発熱抵抗線の両端部310、320
となっており、セラミック焼結体の表面研磨と同時に研
磨される。The heating resistance wire 300 uses a heating coil which is a thin wire having a diameter of about 0.2 mm from the middle part to the tip part which actually contributes to heat generation, and both sides including the both ends which do not want to generate heat are slightly thicker 0.3 to 0.4. It is formed of an electrode lead rod of mm. The rear ends of the electrode lead rods are both ends 310 and 320 of the heating resistance wire.
It is polished simultaneously with the surface polishing of the ceramic sintered body.
［発明が解決しようとする課題］ このさい電極リード棒は、断面積の半分程度まで削り
取られるが、未焼結セラミック成形体への抵抗線埋設時
または焼成時に、埋設位置が幾分ばらつく。このため、
電極リード棒端部の研磨量が増減し、研磨量が少なく、
外部接続用端子面が少ししか露出しなかったり、研磨し
すぎて電極リード棒のセラミック焼結体への埋設量が少
なくなったりする。前者においては、電極端子のろう付
け強度が低下し、後者は電極リード棒とセラミック焼結
体との結合強度が低下し剥離しやすくなる。[Problems to be Solved by the Invention] In this case, the electrode lead rod is shaved to about half of the cross-sectional area, but the embedding position varies somewhat when the resistance wire is buried or sintered in the unsintered ceramic molded body. For this reason,
The polishing amount at the end of the electrode lead rod increases and decreases, the polishing amount is small,
The terminal surface for external connection is only slightly exposed or is polished too much, so that the amount of the electrode lead rod embedded in the ceramic sintered body is reduced. In the former, the brazing strength of the electrode terminal is reduced, and in the latter, the bonding strength between the electrode lead rod and the ceramic sintered body is reduced, and the electrode is easily peeled.
なお電極リード棒があまり太いと、セラミック焼結体
との熱膨張差によりセラミック焼結体に加わる熱応力が
大きくなるため、セラミック焼結体の耐久性を低下させ
ることになる。If the electrode lead rod is too thick, the thermal stress applied to the ceramic sintered body increases due to the difference in thermal expansion with the ceramic sintered body, and thus the durability of the ceramic sintered body is reduced.
またタングステンなど高融点金属は、硬いため極めて
加工しにくく、鍛造による線引きは比較的容易である
が、研磨される電極リード棒の端部のみ径大に成形する
など詳細な部品の精密な加工は電解に因るしかなく、製
造コストの著しい増大を招く。Refractory metals such as tungsten are hard to process because they are hard, and wire drawing by forging is relatively easy, but precise processing of detailed parts, such as forming only the end of the electrode lead rod to be polished to a large diameter, is difficult. This is due to electrolysis, which leads to a significant increase in manufacturing cost.
この発明の目的は、発熱抵抗体と接続された電極リー
ドのセラミック焼結体に対する埋設位置が幾分ばらつい
ても、セラミック焼結体表面に外部端子等の露出面を十
分確保でき易く、前記露出面において外部端子等と電気
的接続を図る場合、ろう付け等の接合強度の低下を防止
でき、かつ外部端子等と電気的接続をする金属成形体も
セラミック焼結体と結合することとなるため、電極リー
ドの結合強度の低下が有効に防止できるセラミックヒー
タの提供にある。An object of the present invention is to easily secure a sufficient exposed surface of an external terminal or the like on the surface of a ceramic sintered body even if the embedment position of the electrode lead connected to the heating resistor to the ceramic sintered body varies to some extent. When electrical connection is made with external terminals and the like on the surface, a decrease in bonding strength such as brazing can be prevented, and a metal molded body electrically connected to the external terminals and the like will also be bonded to the ceramic sintered body. Another object of the present invention is to provide a ceramic heater capable of effectively preventing a decrease in the bonding strength of an electrode lead.
［課題を解決するための手段］ 上記目的達成のため、本発明のセラミックヒータは、
セラミック焼結体に埋設された発熱抵抗体と、先端部が
前記発熱抵抗体と接続され、後端部の少なくとも一部が
前記セラミック焼結体の表面に露出するようにして前記
セラミック焼結体に埋設されたタングステン、モリブデ
ン、レニウム等の高融点金属またはその合金からなる電
極リードと、前記電極リードの後端部と接続され、少な
くとも一部が前記セラミック焼結体の表面に露出するよ
うにして前記セラミック焼結体に埋設された前記高融点
金属またはその合金からなる金属成形体とを備えること
を特徴とする構成を採用した。[Means for Solving the Problems] To achieve the above object, a ceramic heater according to the present invention comprises:
A heating resistor buried in the ceramic sintered body, a front end connected to the heating resistor, and a rear end exposed at least partially on the surface of the ceramic sintered body; An electrode lead made of a high melting point metal such as tungsten, molybdenum, rhenium or the like or an alloy thereof embedded in the electrode lead, and connected to the rear end of the electrode lead, at least a part of which is exposed to the surface of the ceramic sintered body. And a metal molded body made of the high melting point metal or an alloy thereof embedded in the ceramic sintered body.
［作用および発明の効果］ 本発明のセラミックヒータは、つぎの作用、効果を有
する。[Functions and Effects of the Invention] The ceramic heater of the present invention has the following functions and effects.
１）電極リードの後端部は少なくとも一部がセラミック
焼結体の表面に露出するようにセラミック焼結体に埋設
されていると共に、その電極リードの後端部が、少なく
とも一部が露出するようにセラミック焼結体に埋設され
た金属成形体と接続されていることから、外部端子等と
の電気的接続を露出されてなる電極リードの後端部及び
金属成形体に対して確実に行うことができる。また、セ
ラミック焼結体に対して発熱抵抗体と接続された電極リ
ードの埋設位置が多少ばらついても、電極リードに金属
成形体が接続されていることにより、前記外部端子等の
ろう付け接合強度の低下を防止できる。さらに、外部端
子等にろう付けを剥離する方向の力が働いたとしても、
この金属成形体によって力が分散されるため、電極リー
ドとセラミック焼結体との結合強度の低下をも確実に防
止できる。1) The rear end of the electrode lead is embedded in the ceramic sintered body so that at least a part thereof is exposed on the surface of the ceramic sintered body, and at least a part of the rear end of the electrode lead is exposed. As described above, the electrical connection with the external terminals and the like is reliably performed on the exposed rear end portion of the electrode lead and the metal molded body since the metal molded body embedded in the ceramic sintered body is connected as described above. be able to. Further, even if the embedded positions of the electrode leads connected to the heating resistor with respect to the ceramic sintered body vary somewhat, the brazing joint strength of the external terminals and the like can be improved because the metal molded body is connected to the electrode leads. Can be prevented from decreasing. Furthermore, even if a force in the direction of peeling brazing acts on the external terminals, etc.,
Since the force is dispersed by the metal molded body, a decrease in the bonding strength between the electrode lead and the ceramic sintered body can be reliably prevented.
２）電極リードは、セラミック焼結体の表面に露出され
る後端部以外は通常の大きさであるため、セラミック焼
結体の耐久性の低下を防止できる。2) Since the electrode lead has a normal size except for the rear end exposed on the surface of the ceramic sintered body, it is possible to prevent a decrease in the durability of the ceramic sintered body.
３）特殊形状に加工した電極リードを用いず、金属成形
体と接続させるだけで、外部端子等と電気的接続される
露出面を大きくすることができるので、製造コストが安
い。3) The exposed surface electrically connected to the external terminals and the like can be enlarged simply by connecting to the metal molded body without using the electrode lead processed into a special shape, so that the manufacturing cost is low.
［実施例］ つぎにこの発明を第１図〜第３図に示す実施例に基づ
き説明する。[Embodiment] Next, the present invention will be described based on the embodiment shown in FIGS.
本発明のセラミックヒータ１は、電気絶縁性セラミッ
クである窒化珪素質セラミック焼結体２と、このセラミ
ック焼結体２中に埋設された発熱抵抗線３とからなる。A ceramic heater 1 according to the present invention includes a silicon nitride ceramic sintered body 2 which is an electrically insulating ceramic, and a heating resistance wire 3 embedded in the ceramic sintered body 2.
セラミック焼結体２は、先端が半球状とされた外径6m
m、全長50mm程度の円柱状を呈する。The ceramic sintered body 2 has an outer diameter of 6 m with a hemispherical tip.
m, columnar shape with a total length of about 50mm.
発熱抵抗線３は、前記セラミック焼結体２の後側部22
に並行的に埋設されている一対のタングステン製電極リ
ード棒５および６（両側部）と、この各電極リード棒
５、６の先端にその両端が接続されて、前記焼結体の先
側部23に略Ｕ字型に埋設された発熱コイル４（発熱抵抗
体）とからなる。電極リード棒５および６は線径0.4mm
のタングステン線、発熱コイル４はタングステン−レニ
ウム合金製で線径0.22mmの細線を巻径1.0mmに螺旋巻き
してある。The heating resistance wire 3 is connected to the rear side 22 of the ceramic sintered body 2.
A pair of tungsten electrode lead rods 5 and 6 (both sides) buried in parallel with each other, and both ends are connected to the tips of the electrode lead rods 5 and 6, respectively, so that the front side part of the sintered body is formed. 23, a heating coil 4 (heating resistor) embedded in a substantially U-shape. Electrode lead rods 5 and 6 have a wire diameter of 0.4 mm
The heating wire 4 is made of a tungsten-rhenium alloy, and a fine wire having a wire diameter of 0.22 mm is spirally wound to a winding diameter of 1.0 mm.
電極リード棒５の後端部は発熱抵抗線３の一方の端部
31となっており、線形0.22mmのタングステン線をら巻き
した筒状体（金属成形体）７が外嵌されて径大化してお
り、セラミック焼結体２の後端部の側壁面に平行すると
ともに、研磨により外部接続用端子面3Aとして露出され
ている。The rear end of the electrode lead rod 5 is one end of the heating resistance wire 3
A cylindrical body (metal molded body) 7 formed by winding a tungsten wire having a linear shape of 0.22 mm is externally fitted to increase the diameter, and is parallel to the side wall surface of the rear end of the ceramic sintered body 2. At the same time, it is exposed as an external connection terminal surface 3A by polishing.
電極リード棒６の後端部は、発熱抵抗線３の他方の端
部32となっており、前記と同一の筒状体７が外嵌されて
径大化しており、セラミック焼結体２の中央よりやや後
端よりの側壁面に平行するとともに、外部接続用端子面
3Bとして露出されている。The rear end of the electrode lead rod 6 is the other end 32 of the heating resistance wire 3, and the same cylindrical body 7 as described above is externally fitted to increase the diameter. Parallel to the side wall surface slightly from the center to the rear end, and the terminal surface for external connection
Exposed as 3B.
つぎに本発明のセラミックヒータの製造方法を第４図
Ａ〜Ｅに基づき説明する。Next, a method of manufacturing a ceramic heater according to the present invention will be described with reference to FIGS.
（Ａ）所定の長さに切断したタングステン線を折り曲げ
て電極リード棒５、６を形成し、その後端部に別途成形
した筒状体７、７を圧入する。(A) An electrode lead rod 5, 6 is formed by bending a tungsten wire cut to a predetermined length, and a separately formed cylindrical body 7, 7 is press-fitted into its rear end.
（Ｂ）つぎにこの電極リード棒５、６の先端にタングス
テン−レニウム合金製発熱コイル４の両端を嵌合して発
熱抵抗線３を製造する。(B) Next, both ends of the heating coil 4 made of a tungsten-rhenium alloy are fitted to the tips of the electrode lead rods 5 and 6 to manufacture the heating resistance wire 3.
（Ｃ）窒化珪素質粉末をプレス成型し、半割成型品2A、
2Bを製造し、発熱抵抗線３をはさみ込み一体プレス成型
して埋設し、仮焼を行う。(C) Press-molding silicon nitride-based powder, half-molded product 2A,
2B is manufactured, and the heating resistance wire 3 is sandwiched, pressed and formed integrally, buried, and calcined.
（Ｄ）仮焼品20を非酸素雰囲気中で1800℃で30分間、ホ
ットプレス圧力300kg/cm2にてホットプレス焼成を行
う。これにより電極リード棒５、６と、その後端部に外
嵌された筒状体７、７とは強固に融着する。(D) The calcined product 20 is subjected to hot press firing at 1800 ° C. for 30 minutes in a non-oxygen atmosphere at a hot press pressure of 300 kg / cm 2 . As a result, the electrode lead rods 5 and 6 and the cylindrical bodies 7 and 7 fitted to the rear ends thereof are firmly fused.
（Ｅ）研磨により製品形状整形および電極露出を行う。
この研磨により前記筒状体７を含む電極リード棒５、６
の後端部（発熱抵抗体の両端部31、32）はほぼ断面積の
半分程度が削り落とされ、面積の大きい外部接続用端子
面3A、3Bが露出する。(E) Product shape shaping and electrode exposure are performed by polishing.
By this polishing, the electrode lead rods 5 and 6 including the cylindrical body 7 are formed.
The rear ends (both ends 31 and 32 of the heating resistor) are cut off in approximately half of the cross-sectional area, and the external connection terminal surfaces 3A and 3B having a large area are exposed.
第５図は本発明にかかるセラミックヒータ１を用いた
ディーゼル機関のグロープラグを示す。このグロープラ
グ100は、筒状の取付金具101の先端部に、金属製支持筒
102を内嵌し、この支持筒102内に前記セラミックヒータ
１の中間部を嵌め込み、取付金具101内の軸心を挿通し
てカップ状先端を備えた中心電極103を配するととも
に、その先端をセラミックヒータ１の後端に嵌着させて
なる。FIG. 5 shows a glow plug of a diesel engine using the ceramic heater 1 according to the present invention. The glow plug 100 is provided with a metal support tube at the tip of a cylindrical mounting bracket 101.
102, an intermediate portion of the ceramic heater 1 is inserted into the support cylinder 102, a central electrode 103 having a cup-shaped tip is inserted through an axis in the mounting bracket 101, and the tip of the center electrode 103 is inserted. It is fitted to the rear end of the ceramic heater 1.
この発明のセラミックヒータはガス燃焼機器の点火源
として使用でき、またセラミック焼結体は角柱状、また
は板状であってもよく、さらに筒状体７は金属パイプを
切断して金属製筒状体を形成してもよい。The ceramic heater of the present invention can be used as an ignition source for gas-fired equipment, and the ceramic sintered body may be in the shape of a prism or a plate. A body may be formed.
第１図は本発明のセラミックヒータの正面断面図、第２
図はその平面図、第３図は右側面図、第４図Ａ〜Ｅはセ
ラミックヒータの製造工程図、第５図は本発明のセラミ
ックヒータを用いたディーゼル機関のグロープラグの要
部断面図である。第６図Ａ、Ｂ、Ｃは従来のセラミック
ヒータを示し、Ａは正面図、Ｂは平面図、Ｃは右側面図
である。 図中 １……セラミックヒータ、２……窒化珪素質セラ
ミック焼結体、３……発熱抵抗線、４……発熱コイル、
７……金属製筒状体、3A、3B……外部接続用端子面FIG. 1 is a front sectional view of a ceramic heater of the present invention, and FIG.
Fig. 3 is a plan view, Fig. 3 is a right side view, Figs. 4A to 4E are manufacturing process diagrams of a ceramic heater, and Fig. 5 is a cross-sectional view of a main part of a glow plug of a diesel engine using the ceramic heater of the present invention. It is. 6A, 6B and 6C show a conventional ceramic heater, wherein A is a front view, B is a plan view, and C is a right side view. In the figure, 1 ... ceramic heater, 2 ... silicon nitride ceramic sintered body, 3 ... heating resistance wire, 4 ... heating coil,
7. Metallic cylindrical body, 3A, 3B ... Terminal surface for external connection
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) H05B 3/02 H05B 3/12 H05B 3/14 H05B 3/48 ──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. 7 , DB name) H05B 3/02 H05B 3/12 H05B 3/14 H05B 3/48
Claims (1)
と、 先端部が前記発熱抵抗体と接続され、後端部の少なくと
も一部が前記セラミック焼結体の表面に露出するように
して前記セラミック焼結体に埋設されたタングステン、
モリブデン、レニウム等の高融点金属またはその合金か
らなる電極リードと、 前記電極リードの後端部と接続され、少なくとも一部が
前記セラミック焼結体の表面に露出するようにして前記
セラミック焼結体に埋設された前記高融点金属またはそ
の合金からなる金属成形体とを備えることを特徴とする
セラミックヒータ。1. A heating resistor embedded in a ceramic sintered body, a leading end connected to the heating resistor, and a rear end exposed at least partially on the surface of the ceramic sintered body. Tungsten embedded in the ceramic sintered body,
An electrode lead made of a high melting point metal such as molybdenum or rhenium or an alloy thereof; and a rear end portion of the electrode lead, wherein at least a part of the electrode lead is exposed to the surface of the ceramic sintered body. And a metal molded body made of the high melting point metal or an alloy thereof embedded in the ceramic heater.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2301812A JP3017273B2 (en) | 1990-11-07 | 1990-11-07 | Ceramic heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2301812A JP3017273B2 (en) | 1990-11-07 | 1990-11-07 | Ceramic heater |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04174991A JPH04174991A (en) | 1992-06-23 |
| JP3017273B2 true JP3017273B2 (en) | 2000-03-06 |
Family
ID=17901461
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2301812A Expired - Fee Related JP3017273B2 (en) | 1990-11-07 | 1990-11-07 | Ceramic heater |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3017273B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR0183533B1 (en) * | 1997-03-03 | 1999-04-15 | 재단법인한국화학연구소 | Ceramic heater for glow plug |
| WO2012118100A1 (en) * | 2011-02-28 | 2012-09-07 | 京セラ株式会社 | Heater and glow-plug provided therewith |
-
1990
- 1990-11-07 JP JP2301812A patent/JP3017273B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04174991A (en) | 1992-06-23 |
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