JP3079444B2 - Metal terminal joint of ceramic heating element and its forming method - Google Patents
Metal terminal joint of ceramic heating element and its forming methodInfo
- Publication number
- JP3079444B2 JP3079444B2 JP03112319A JP11231991A JP3079444B2 JP 3079444 B2 JP3079444 B2 JP 3079444B2 JP 03112319 A JP03112319 A JP 03112319A JP 11231991 A JP11231991 A JP 11231991A JP 3079444 B2 JP3079444 B2 JP 3079444B2
- Authority
- JP
- Japan
- Prior art keywords
- metal
- heating element
- ceramic heating
- metal terminal
- layer
- 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
- 229910052751 metal Inorganic materials 0.000 title claims description 92
- 239000002184 metal Substances 0.000 title claims description 92
- 238000010438 heat treatment Methods 0.000 title claims description 44
- 239000000919 ceramic Substances 0.000 title claims description 36
- 238000000034 method Methods 0.000 title claims description 15
- 210000001503 joint Anatomy 0.000 title claims description 6
- 239000010410 layer Substances 0.000 claims description 34
- 239000000853 adhesive Substances 0.000 claims description 22
- 230000001070 adhesive effect Effects 0.000 claims description 22
- 238000005304 joining Methods 0.000 claims description 17
- 239000011247 coating layer Substances 0.000 claims description 13
- 238000005507 spraying Methods 0.000 claims description 11
- 239000000463 material Substances 0.000 description 9
- 239000010408 film Substances 0.000 description 8
- 239000007921 spray Substances 0.000 description 8
- 230000020169 heat generation Effects 0.000 description 7
- 238000001816 cooling Methods 0.000 description 6
- 238000005219 brazing Methods 0.000 description 5
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 238000005187 foaming Methods 0.000 description 3
- 229910000623 nickel–chromium alloy Inorganic materials 0.000 description 3
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 230000032798 delamination Effects 0.000 description 2
- 238000005530 etching Methods 0.000 description 2
- 238000011835 investigation Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 238000007788 roughening Methods 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N Acrylic acid Chemical compound OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 229910017563 LaCrO Inorganic materials 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000000956 alloy Substances 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
- YXTPWUNVHCYOSP-UHFFFAOYSA-N bis($l^{2}-silanylidene)molybdenum Chemical compound [Si]=[Mo]=[Si] YXTPWUNVHCYOSP-UHFFFAOYSA-N 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- DTDCCPMQHXRFFI-UHFFFAOYSA-N dioxido(dioxo)chromium lanthanum(3+) Chemical compound [La+3].[La+3].[O-][Cr]([O-])(=O)=O.[O-][Cr]([O-])(=O)=O.[O-][Cr]([O-])(=O)=O DTDCCPMQHXRFFI-UHFFFAOYSA-N 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000010285 flame spraying Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000007750 plasma spraying Methods 0.000 description 1
- 229910021426 porous silicon Inorganic materials 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
- 238000005488 sandblasting Methods 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000007751 thermal spraying Methods 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
Landscapes
- Resistance Heating (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、例えば炭化珪素のよう
なセラミックス発熱体と金属端子との接合構造および比
較的大面積の発熱体端面に金属端子を強固に固定するた
めの接合部形成法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joining structure between a ceramic heating element such as silicon carbide and a metal terminal and a method for forming a joining portion for firmly fixing the metal terminal to the end surface of the heating element having a relatively large area. About.
【０００２】[0002]
【従来の技術】セラミックス発熱体の端面に金属ターミ
ナルを固定する手段としては、これら部材を物理的に接
触させる方法と接合材を用いて接合する方法とがある。
このうち、物理的に接触させる方法は端面の接触面積が
大きい場合には適しているが、400 ℃を越える高温域で
使用するとターミナル部分に酸化現象が発生し、接触界
面の抵抗が高くなって電流が流れなくなる欠点がある。2. Description of the Related Art As means for fixing a metal terminal to an end face of a ceramic heating element, there are a method of physically contacting these members and a method of bonding using a bonding material.
Of these, the physical contact method is suitable when the contact area of the end face is large, but when used in a high temperature region exceeding 400 ° C, oxidation occurs at the terminal and the resistance at the contact interface increases. There is a drawback that no current flows.
【０００３】一方、接合する技術には、接合材として金
属ろう付材や金属溶射材を用いる方法が知られている。
このうち金属ろう付けは、セラミックスと金属を強固に
接合することができるが、ろう付け操作は 800℃を越え
る高温と特殊の雰囲気条件下でおこなう必要があり、そ
のうえろう材や金属端子の熱膨張率は接合対象となるセ
ラミックス発熱体に比べてかなり高い関係でろう付け後
に室温に戻すと接合界面が剥離したりセラミックス発熱
体が破損することがある。この点を改良するため、セラ
ミックスと金属の間にセラミックス中間層と金属中間層
を介挿させる接合手段が提案されている（特開昭63−22
5585号) 。ところが、この方法では接合工程に手数が掛
かって量産性に乏しいうえ、１cm2 程度の接合面積しか
ろう付けすることができない欠点がある。On the other hand, as a joining technique, a method using a metal brazing material or a metal spray material as a joining material is known.
Of these, metal brazing can firmly join ceramics and metal, but the brazing operation must be performed at high temperatures exceeding 800 ° C and under special atmospheric conditions, and the thermal expansion of brazing materials and metal terminals Since the rate is considerably higher than that of the ceramic heating element to be joined, if the temperature is returned to room temperature after brazing, the joining interface may peel off or the ceramic heating element may be damaged. In order to improve this point, a joining means for interposing a ceramic intermediate layer and a metal intermediate layer between ceramic and metal has been proposed (Japanese Patent Laid-Open No. 63-22 / 1988).
No. 5585). However, this method has the drawback that the joining step is troublesome, the mass productivity is poor, and the joining area can be brazed to only about 1 cm 2 .
【０００４】金属溶射材を用いる方法については、特公
昭26−989 号公報に抵抗体端子として提案されている。
この種の金属溶射法によれば、比較的簡単な工程で接触
抵抗の小さな接合部を形成することができる。A method using a metal spray material has been proposed as a resistor terminal in Japanese Patent Publication No. 26-989.
According to this type of metal spraying method, a joint having low contact resistance can be formed by a relatively simple process.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、金属溶
射による接合手段を採る場合には溶射する金属の膜厚が
接合部の接触ならびに強度に著しい影響を与えるため、
形成する金属溶射層を一定範囲の膜厚にしない限り耐久
性のある正常な接触固定を得ることができない。更に、
金属溶射を施したセラミックス発熱体は400〜500 ℃程
度の発熱であれば正常に使用できるが、端部温度が700
℃位まで上昇すると冷却段階でセラミックス発熱体と溶
射金属の熱膨張差に基づく残留応力により、金属溶射層
の剥離や発熱体の破壊などの現象を惹起する難点があ
る。However, when the joining means by metal spraying is employed, the thickness of the metal to be sprayed has a remarkable influence on the contact and strength of the joint.
Unless the metal sprayed layer to be formed has a thickness within a certain range, it is not possible to obtain a durable normal contact fixing. Furthermore,
A ceramic heating element with metal spraying can be used normally as long as it generates heat of about 400 to 500 ° C.
When the temperature rises to about ° C., there is a problem that phenomena such as peeling of the metal sprayed layer and destruction of the heating element are caused by residual stress based on a difference in thermal expansion between the ceramic heating element and the sprayed metal in the cooling stage.
【０００６】本発明の目的は、金属溶射法を用いて広い
接合面積でも強固な接合構造を備え、700 ℃を越える発
熱度においても正常かつ安定に使用することができる耐
久性に優れたセラミックス発熱体の金属端子接合部とそ
の形成法を提供することにある。SUMMARY OF THE INVENTION It is an object of the present invention to provide a ceramic heat-generating material which has a strong bonding structure using a metal spraying method even in a wide bonding area and can be used normally and stably even at a heat generation exceeding 700 ° C. An object of the present invention is to provide a metal terminal joint of a body and a method of forming the same.
【０００７】[0007]
【課題を解決するための手段】上記の目的を達成するた
めの本発明によるセラミックス発熱体の金属端子接合部
は、セラミックス発熱体の端面に金属端子を平均膜厚 1
00〜400 μm の金属溶射層で固定し、その上面に平均膜
厚 100〜300 μm の無機系接着剤被覆層を形成してなる
ことを構成上の特徴とする。In order to achieve the above object, a metal terminal joint of a ceramic heating element according to the present invention comprises a metal terminal on an end face of the ceramic heating element having an average thickness of 1 mm.
It is fixed by a metal sprayed layer of 00 to 400 μm, and an inorganic adhesive coating layer having an average film thickness of 100 to 300 μm is formed on the upper surface thereof.
【０００８】本発明で対象とするセラミックス発熱体
は、例えば炭化珪素(SiC) 、珪化モリブデン(MoSi2) 、
ランタンクロメート(LaCrO3)系の材料で形成された発熱
体であり、ターミナルを構成する金属はニッケルおよび
その合金、ステンレス鋼などの耐熱性、耐酸化性に優れ
る導電金属である。溶射金属には、ニッケルクロム合金
が好適に用いられる。The ceramic heating element of the present invention includes, for example, silicon carbide (SiC), molybdenum silicide (MoSi 2 ),
The heating element is made of a lanthanum chromate (LaCrO 3 ) -based material. The metal constituting the terminal is a conductive metal having excellent heat resistance and oxidation resistance, such as nickel and its alloys and stainless steel. A nickel chromium alloy is preferably used as the spray metal.
【０００９】図１は本発明に係る接合部を模式的に示し
た断面図で、セラミックス発熱体１の両端面に金属端子
２が金属溶射層３および無機系接着剤被覆層４を介して
固定されている。FIG. 1 is a cross-sectional view schematically showing a joint according to the present invention. Metal terminals 2 are fixed to both end surfaces of a ceramic heating element 1 via a metal spray layer 3 and an inorganic adhesive coating layer 4. Have been.
【００１０】上記の積層接合構造において、金属溶射層
の平均膜厚を 100〜400 μm に設定する理由は、 100μ
m 未満では通電発熱させる際に電流が層方向に流れ難く
なって不均一発熱の原因となり、400 μm を越えると高
温に発熱させた場合に溶射膜が剥離してしまい耐久性が
減退するからである。より好適な膜厚範囲は、200 〜30
0 μm である。In the above-mentioned laminated joint structure, the reason why the average thickness of the metal sprayed layer is set to 100 to 400 μm is as follows.
If it is less than 400 m, it is difficult for the current to flow in the layer direction when generating heat, causing uneven heating.If it exceeds 400 μm, the thermal sprayed film will peel off when heated to a high temperature and durability will be reduced. is there. A more preferable thickness range is 200 to 30.
0 μm.
【００１１】金属溶射層の上面に被覆形成する無機系接
着剤としては、シリカやアルミナを主成分とするものが
有効に用いられ、これらは例えば商品名“スミセラム”
〔朝日化学工業（株）製〕、商品名“アロンセラミッ
ク”〔東亞合成化学工業（株）製〕、商品名“セラマボ
ンド”〔米国 AREMCO 社製〕等として市販されている。
この種の無機系接着剤はいずれも 100〜300 ℃で硬化さ
せることができ、セラミックス発熱体や金属溶射層に悪
影響を与えることなしに強固にコーティングすることが
できる。無機系接着剤被覆層の平均膜厚を 100〜300 μ
m に設定するのは、100 μm 未満では高温発熱時に溶射
膜の剥離が生じ、また 300μm を上廻ると接着剤の硬化
段階で発泡現象が起こって接着力の低下を招くからであ
る。より好適な膜厚範囲は、 200〜300 μm である。As the inorganic adhesive for forming a coating on the upper surface of the metal sprayed layer, those having silica or alumina as a main component are effectively used.
[Asahi Chemical Industry Co., Ltd.], trade name “Aron Ceramic” (Toagosei Chemical Industry Co., Ltd.), trade name “Ceramabond” (AREMCO, USA) and the like.
Any of these types of inorganic adhesives can be cured at 100 to 300 ° C. and can be coated firmly without adversely affecting the ceramic heating element and the metal sprayed layer. Average thickness of inorganic adhesive coating layer is 100-300μ
The reason for setting m is that if it is less than 100 μm, the sprayed coating will peel off at the time of high-temperature heat generation, and if it exceeds 300 μm, a foaming phenomenon will occur at the curing stage of the adhesive, resulting in a decrease in adhesive strength. A more preferred film thickness range is 200 to 300 μm.
【００１２】上記セラミックス発熱体の金属端子接合部
を得るための本発明の接合部形成法は、10cm2 以上の面
積を有するセラミックス発熱体の接合端面に金属端子を
仮接着したのち、仮接着した金属端子の上部から接合端
面に金属溶射を施して平均膜厚 100〜400 μm の金属溶
射層を形成し、ついで金属溶射層の上面に無機系接着剤
を塗布して平均膜厚 100〜300 μm の被覆層を形成する
ことを特徴とする。According to the method of forming a bonding portion of the present invention for obtaining a metal terminal bonding portion of the ceramic heating element, the metal terminal is temporarily bonded to the bonding end face of the ceramic heating element having an area of 10 cm 2 or more, and then the temporary bonding is performed. Metal spraying is applied to the joining end face from the top of the metal terminal to form a metal sprayed layer with an average thickness of 100 to 400 μm, and then an inorganic adhesive is applied to the upper surface of the metal sprayed layer to obtain an average thickness of 100 to 300 μm. Is formed.
【００１３】セラミックス発熱体の接合端面は、10cm2
以上の比較的大きな面積を対象とする。この接合端面を
予め清浄化したのちサンドブラスト等の手段によって粗
化・目詰め処理を施す。この面に金属端子を仮接着す
る。仮接着の方法は、金属端子をセラミックス発熱体の
端面に物理的に仮付けするか、無機系接着剤による接着
を介しておこなうことができるが、接着状態は金属溶射
時に金属端子が動かなければよい。The bonding end face of the ceramic heating element is 10 cm 2
The above relatively large area is targeted. After cleaning this joint end face in advance, roughening and plugging are performed by means such as sand blasting. A metal terminal is temporarily bonded to this surface. Temporary bonding can be done by physically attaching the metal terminal to the end face of the ceramic heating element or by bonding with an inorganic adhesive. Good.
【００１４】金属ターミナルは、板、線、網などの形状
として用いることができ、表面にブラスト処理またはエ
ッチング処理を施して使用に供することが好ましい。ま
た、セラミックス発熱体の端面に対する金属端子の固定
面積には特に限定はなく、発熱時の電流値などを考慮し
て任意に決定することができるが、少なくとも面積比と
して1/20になるように設定することが望ましい。The metal terminal can be used in the form of a plate, a wire, a net or the like, and it is preferable that the surface is subjected to a blast treatment or an etching treatment before use. The fixed area of the metal terminal with respect to the end face of the ceramic heating element is not particularly limited, and can be arbitrarily determined in consideration of a current value at the time of heat generation. It is desirable to set.
【００１５】ついで、仮接着した金属端子の上面から接
合端面に金属溶射を施す。溶射金属には例えばニッケル
クロム合金が用いられ、金属溶射の方法は火炎溶射、プ
ラズマ溶射など常用の手段でおこなうことができる。こ
の際、溶射条件を調整して平均膜厚が 100〜400 μm 範
囲の金属溶射層を形成する。該溶射により、例えば電気
比抵抗が数Ωcmのセラミックス発熱体の端面に電気比抵
抗10-4〜10-5Ωcmの金属溶射層を形成した場合には、表
面抵抗は大幅に減少する。Then, metal spraying is performed from the upper surface of the temporarily bonded metal terminal to the joint end surface. For example, a nickel-chromium alloy is used as the metal to be sprayed, and the metal spraying method can be performed by a conventional method such as flame spraying or plasma spraying. At this time, the metal sprayed layer having an average film thickness in the range of 100 to 400 μm is formed by adjusting the spraying conditions. For example, when a metal sprayed layer having an electrical resistivity of 10 -4 to 10 -5 Ωcm is formed on the end face of a ceramic heating element having an electrical resistivity of several Ωcm, the surface resistance is greatly reduced.
【００１６】ついで、金属溶射層の上面に無機系接着剤
を塗布し、所定の条件で硬化処理する。塗布操作には、
刷毛塗り、スプレー塗布などの手段を用い、平均膜厚が
100〜300 μm 範囲の被覆層を形成する。Then, an inorganic adhesive is applied to the upper surface of the metal sprayed layer and cured under predetermined conditions. For the coating operation,
Using means such as brush coating or spray coating, the average film thickness
Form a coating layer in the range of 100-300 μm.
【００１７】[0017]
【作用】一般に、セラミックス材と金属を接合しようと
する際には、両材料間の熱膨張差により加熱・冷却の繰
り返しで接合界面に残留応力がかかり、剥離する現象が
発生する。しかし、金属には延性があるため接合金属層
を薄くすれば応力を緩和することができる。本発明によ
れば金属の薄膜形成が容易な溶射法を適用し、平均膜厚
100〜400 μm の金属溶射層を形成することにより10cm
2 以上の接合面積に対しても強固な接合が可能となる。In general, when joining a ceramic material and a metal, residual stress is applied to the joining interface due to repetition of heating and cooling due to a difference in thermal expansion between the two materials, and a phenomenon of peeling occurs. However, since the metal has ductility, the stress can be reduced by making the joining metal layer thin. According to the present invention, the thermal spraying method for easily forming a metal thin film is applied, and the average film thickness is
10 cm by forming a metal spray layer of 100-400 μm
Strong bonding is possible even for two or more bonding areas.
【００１８】形成された金属溶射層の表面電気抵抗はセ
ラミックス発熱体のそれよりも大幅に低下するから、通
電発熱させると電流は接合した金属端子から先行的に金
属溶射層の全面に流れ、ついでセラミックス発熱体全体
を通って他端の金属端子に流通する。この際、セラミッ
クス発熱体の端面、金属端子および金属溶射層間の接触
抵抗は無視しえるほど小さくなるため、電力の損失なし
にセラミックス発熱体の全体が均一に発熱する。Since the surface electrical resistance of the formed metal sprayed layer is much lower than that of the ceramic heating element, when current is generated and heated, current flows from the joined metal terminals to the entire surface of the metal sprayed layer in advance. It flows through the entire ceramic heating element to the metal terminal at the other end. At this time, since the contact resistance between the end face of the ceramic heating element, the metal terminal, and the metal sprayed layer becomes negligibly small, the entire ceramic heating element uniformly generates heat without loss of power.
【００１９】ところが、上記の金属溶射層による接合で
も 700℃を越える温度域の加熱・冷却の繰り返した場合
には、セラミックス発熱体との熱膨張差に基づく残留応
力が発生する。溶射金属層には延性があるが、高い発熱
条件で使用すると延性を越える熱膨張差が起きて金属溶
射層に反りが発生し、剥離が進行するようになる。この
剥離現象は、金属溶射層の上面に形成する無機系接着剤
被覆層の拘束作用によって未然に防ぐことが可能とな
る。However, even when the above-described joining by the metal sprayed layer is repeated heating and cooling in a temperature range exceeding 700 ° C., residual stress is generated due to a difference in thermal expansion from the ceramic heating element. The thermal sprayed metal layer has ductility, but when used under high heat generation conditions, a difference in thermal expansion exceeding ductility occurs, causing the metal sprayed layer to warp and peeling to proceed. This peeling phenomenon can be prevented beforehand by the restraining action of the inorganic adhesive coating layer formed on the upper surface of the metal sprayed layer.
【００２０】このような金属溶射層と無機系接着剤被覆
層との介在に基づく複合的な接合機能を介して、900 ℃
程度の高発熱温度においても層間剥離のない正常かつ安
定な均一発熱状態が発現する。Through a composite bonding function based on the interposition of such a metal sprayed layer and an inorganic adhesive coating layer, 900 ° C.
Even at a high heat generation temperature, a normal and stable uniform heat generation state without delamination develops.
【００２１】[0021]
【実施例】以下、本発明の実施例を比較例と対比して説
明する。 実施例１〜４ あらかじめ、ターミナルを接合する端面（両側面）が平
滑に目封じされた一辺100mm の正方形多孔質炭化ケイ素
発熱体( 電気比抵抗３Ωcm）の接合端面（目封じ面）を
サンドブラストにより粗化処理し、この端面にエッチン
グ処理を施した幅30mm、長さ50mm、厚さ0.1mm のニッケ
ル網板 (網目20#)からなる金属端子を無機系接着剤〔商
品名“スミセラムＳ−２０８Ｂ”朝日化学工業（株）
製〕で仮接着した。この際の金属端子の接合面積は、30
×20mmとした。Hereinafter, examples of the present invention will be described in comparison with comparative examples. Examples 1 to 4 A joining end face (plugging face) of a square porous silicon carbide heating element (electrical resistivity 3 Ωcm) having a side of 100 mm in which the end faces (both side faces) for joining the terminals were plugged in advance was sandblasted. A metal terminal made of a nickel mesh plate (mesh 20 #) having a width of 30 mm, a length of 50 mm, and a thickness of 0.1 mm, which has been subjected to a roughening treatment and an etching treatment applied to the end face thereof, is applied to an inorganic adhesive [trade name "Sumiceram S-208B""Asahi Chemical Industry Co., Ltd.
Manufactured). The bonding area of the metal terminals at this time is 30
X 20 mm.
【００２２】仮接着した金属端子の上部から接合端面の
全面に、ニッケルクロム合金を溶射金属としてアーク溶
射法を用いて金属溶射層を形成し、金属端子を接合し
た。ついで、金属溶射層の上面に無機系接着剤〔商品名
“スミセラムＳ−２０８Ｂ、Ｓ−２０８ＡおよびＳ−１
８Ｃ”朝日化学工業（株）製〕を平均 300μm の膜厚に
刷毛塗りして被覆層を形成し、引き続き所定の加熱条件
で硬化処理をおこなった。形成された無機系接着剤の被
覆層には発泡等な全く認められず、極めて強固なもので
あった。A metal sprayed layer was formed on the temporarily bonded metal terminal from the top to the entire joint end face by using an arc spraying method using a nickel chromium alloy as a spray metal, and the metal terminals were joined. Then, an inorganic adhesive [trade name "Sumiceram S-208B, S-208A and S-1"] is applied to the upper surface of the metal sprayed layer.
8C "manufactured by Asahi Chemical Industry Co., Ltd.] to form a coating layer by brushing to an average film thickness of 300 μm, and then subjected to a curing treatment under a predetermined heating condition. Was extremely strong without foaming or the like.
【００２３】このようにして金属端子を接合した各セラ
ミックス発熱体に通電し、900 ℃に発熱させた時の発熱
状況、加熱・冷却時における金属溶射層の剥離状況を測
定した。なお、剥離試験の加熱・冷却条件は、発熱体を
空気中で通電発熱させ室温から 900℃まで10分間で昇温
し、ついで自然冷却するサイクルを 100回反復する方法
によった。その結果を形成した金属溶射層および無機系
接着剤被覆層の条件と対比させて表１に示した。Electricity was applied to each ceramic heating element to which the metal terminals were joined in this manner, and the heat generation state when the heat was generated at 900 ° C. and the peeling state of the metal sprayed layer during heating and cooling were measured. The heating and cooling conditions for the peeling test were such that a heating element was heated in air to generate heat in air, the temperature was raised from room temperature to 900 ° C. in 10 minutes, and then a natural cooling cycle was repeated 100 times. The results are shown in Table 1 in comparison with the conditions of the formed metal spray layer and the inorganic adhesive coating layer.
【００２４】比較例１〜２ 無機系接着剤の平均膜厚を50μm および 400μm になる
ように刷毛塗りしたほかは全て実施例と同一の条件で金
属端子を接合した。比較例２の場合には、接着剤の硬化
過程で発泡現象が認められた。得られた発熱体につき、
実施例と同様にして各種の測定調査をおこない、結果を
表１に併載した。Comparative Examples 1 and 2 Metal terminals were joined under the same conditions as in the Examples except that the inorganic adhesive was brush-coated so that the average film thickness was 50 μm and 400 μm. In the case of Comparative Example 2, a foaming phenomenon was observed during the curing process of the adhesive. For the obtained heating element,
Various measurements and investigations were performed in the same manner as in the examples, and the results are shown in Table 1.
【００２５】比較例３ 無機系接着剤による被覆層を形成しないほかは全て実施
例と同一条件で金属端子を接合した。この発熱体につ
き、実施例と同様に各種の測定調査をおこない結果を表
１に併載した。Comparative Example 3 Metal terminals were joined under the same conditions as in the example except that no coating layer was formed with an inorganic adhesive. Various measurements and investigations were conducted on this heating element in the same manner as in the examples, and the results are also shown in Table 1.
【００２６】 [0026]
【００２７】[0027]
【発明の効果】以上のとおり、本発明に従えば特定され
た膜厚の金属溶射層と無機系接着剤被覆層の積層接合構
造を形成することにより比較的広い面積に対する金属端
子の固定化ができ、かつ 900℃程度の高温発熱において
も層剥離のない安定した耐久使用が可能なセラミックス
発熱体の金属端子接合部を提供することができる。した
がって、長期間の安定使用が保証される。As described above, according to the present invention, it is possible to fix metal terminals over a relatively large area by forming a laminated joint structure of a metal sprayed layer having a specified thickness and an inorganic adhesive coating layer. It is possible to provide a metal terminal joint portion of a ceramic heating element that can be used stably and durably without delamination even at a high temperature of about 900 ° C. Therefore, long-term stable use is guaranteed.
【図１】本発明によるセラミックス発熱体の金属端子接
合部を模式的に示した断面図である。FIG. 1 is a cross-sectional view schematically showing a metal terminal joint of a ceramic heating element according to the present invention.
１ セラミックス発熱体 ２ 金属端子 ３ 金属溶射層 ４ 無機系接着剤被覆層 Reference Signs List 1 ceramic heating element 2 metal terminal 3 metal spray layer 4 inorganic adhesive coating layer
───────────────────────────────────────────────────── 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 3/14 H05B 3/03 H05B 3/20 ──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. 7 , DB name) H05B 3/02 H05B 3/14 H05B 3/03 H05B 3/20
Claims (2)
平均膜厚100 〜400μm の金属溶射層で固定し、その上
面に平均膜厚 100〜300 μm の無機系接着剤被覆層を形
成してなるセラミックス発熱体の金属端子接合部。A metal terminal is fixed to an end face of a ceramic heating element with a metal sprayed layer having an average thickness of 100 to 400 μm, and an inorganic adhesive coating layer having an average thickness of 100 to 300 μm is formed on the upper surface thereof. Metal terminal joint of ceramic heating element.
発熱体の接合端面に金属端子を仮接着したのち、仮接着
した金属端子の上部から接合端面に金属溶射を施して平
均膜厚 100〜400 μm の金属溶射層を形成し、ついで金
属溶射層の上面に無機系接着剤を塗布して平均膜厚 100
〜300 μm の被覆層を形成することを特徴とするセラミ
ックス発熱体の金属端子接合部形成法。2. A metal terminal is temporarily bonded to a joining end surface of a ceramic heating element having an area of 10 cm 2 or more, and then metal spraying is performed on the joining end surface from above the temporarily adhered metal terminal to obtain an average film thickness of 100 to 400 μm. Metal sprayed layer is formed, and then an inorganic adhesive is applied to the upper surface of the metal sprayed layer to obtain an average film thickness of 100
A method for forming a metal terminal junction of a ceramic heating element, comprising forming a coating layer having a thickness of up to 300 μm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03112319A JP3079444B2 (en) | 1991-04-16 | 1991-04-16 | Metal terminal joint of ceramic heating element and its forming method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03112319A JP3079444B2 (en) | 1991-04-16 | 1991-04-16 | Metal terminal joint of ceramic heating element and its forming method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04319284A JPH04319284A (en) | 1992-11-10 |
| JP3079444B2 true JP3079444B2 (en) | 2000-08-21 |
Family
ID=14583696
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP03112319A Expired - Fee Related JP3079444B2 (en) | 1991-04-16 | 1991-04-16 | Metal terminal joint of ceramic heating element and its forming method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3079444B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011106308A (en) * | 2009-11-13 | 2011-06-02 | Toyota Motor Corp | Exhaust gas purification device |
-
1991
- 1991-04-16 JP JP03112319A patent/JP3079444B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04319284A (en) | 1992-11-10 |
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