JP2003004539A - Thermocouple for molten metal - Google Patents
Thermocouple for molten metalInfo
- Publication number
- JP2003004539A JP2003004539A JP2001184335A JP2001184335A JP2003004539A JP 2003004539 A JP2003004539 A JP 2003004539A JP 2001184335 A JP2001184335 A JP 2001184335A JP 2001184335 A JP2001184335 A JP 2001184335A JP 2003004539 A JP2003004539 A JP 2003004539A
- Authority
- JP
- Japan
- Prior art keywords
- thermocouple
- protective tube
- tube
- molten metal
- metal
- 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
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は金属溶湯の温度測定
に好適な耐久性に優れたシース型の金属溶湯用熱電対に
関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheath type thermocouple for molten metal, which is suitable for measuring the temperature of molten metal and has excellent durability.
【０００２】[0002]
【従来の技術】従来、金属溶湯の温度測定に使用する熱
電対として、例えばPt（白金）とPt−Rh（白金−ロジウ
ム）合金とからなる１対の金属素線の先端部を接合して
測定接点とする熱電対を窒化珪素，アルミナ，ジルコニ
アなどからなる保護管に挿入した構造のものが知られて
いる。しかし、窒化珪素製の保護管を用いたものでは、
保護管の珪素成分と金属素線の白金成分とが反応して金
属素線の融点降下を起こし、腐食により断線し易く、耐
久性に乏しくなる。一方、珪素成分を含まないアルミ
ナ，ジルコニアなどのセラミツク製の保護管にすると、
温度の急激な変化に耐える性質、即ち耐熱衝撃性が低下
するので、測定前に保護管を予熱するなど、余分な手間
がかかる。2. Description of the Related Art Conventionally, as a thermocouple used for measuring the temperature of a molten metal, a pair of metal element wires made of, for example, Pt (platinum) and Pt-Rh (platinum-rhodium) alloy are joined to each other by joining the tips thereof. There is known a structure in which a thermocouple serving as a measuring contact is inserted into a protective tube made of silicon nitride, alumina, zirconia, or the like. However, in the case of using the protection tube made of silicon nitride,
The silicon component of the protective tube and the platinum component of the metal element wire react with each other to lower the melting point of the metal element wire, and the wire is easily broken due to corrosion, resulting in poor durability. On the other hand, when using a protective tube made of ceramic such as alumina or zirconia that does not contain silicon,
Since the property of withstanding a sudden change in temperature, that is, the thermal shock resistance is reduced, extra work such as preheating the protective tube before measurement is required.
【０００３】[0003]
【発明が解決しようとする課題】本発明の課題は上述の
問題に鑑み、金属素線の断線を防止して耐久性を高め
た、金属溶湯用熱電対を提供することにある。SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a thermocouple for molten metal which prevents breakage of the metal element wire and has improved durability.
【０００４】[0004]
【課題を解決するための手段】上述の課題を解決するた
めに、本発明の構成は金属溶湯に対する耐食性を有する
保護被膜を外周面に施した保護管と、該保護管に内包さ
れる白金群の金属を主成分とする金属素線と、該金属素
線の外周に配置した絶縁物とからなる金属溶湯用熱電対
において、前記保護管と前記金属素線との間に、前記保
護管から発生する揮発成分を遮断または吸着する遮蔽物
を配置したことを特徴とする。In order to solve the above-mentioned problems, the structure of the present invention has a protective tube having a protective coating on its outer peripheral surface which has corrosion resistance to molten metal, and a platinum group contained in the protective tube. In a thermocouple for molten metal, which comprises a metal wire mainly composed of the metal of (1) and an insulator arranged on the outer periphery of the metal wire, between the protection tube and the metal wire, from the protection tube. It is characterized in that a shield that blocks or adsorbs the generated volatile components is arranged.
【０００５】[0005]
【発明の実施の形態】本発明では保護管と金属素線との
間の遮蔽物として、保護管から発生する揮発成分を遮断
する膜を保護管の内面に施すか、保護管から発生する揮
発成分を吸着する膜を保護管の内面に施す。また、保護
管と金属素線との間の遮蔽物として、筒体または有底管
を配し、保護管と筒体または有底管との間隙に保護管か
ら発生する揮発成分を吸着または吸収する充填材を充填
する。また、保護管の外表面に耐食性の被膜を施す。BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, as a shield between a protective tube and a metal element wire, a film for blocking volatile components generated from the protective tube is provided on the inner surface of the protective tube, or volatilization generated from the protective tube is performed. A membrane that adsorbs the components is applied to the inner surface of the protective tube. A cylinder or a bottomed tube is placed as a shield between the protection tube and the metal element wire, and the volatile components generated from the protection tube are absorbed or absorbed in the gap between the protection tube and the cylinder or the bottomed tube. Fill the filling material. In addition, a corrosion resistant coating is applied to the outer surface of the protective tube.
【０００６】[0006]
【実施例】本発明を図面に示す実施例に基づき説明す
る。図１は本発明の第１の実施例に係る金属溶湯用熱電
対の全体構成を示す側面断面図、図２は同金属溶湯用熱
電対の先端部を拡大して示す側面断面である。金属溶湯
用熱電対を構成する金属素線１，２は一方がPt（白
金）、他方がPt−Rh（白金−ロジウム）合金の対である
（JIS R型）。金属素線１，２の先端は溶接により接合
されて測定接点３を形成する。金属素線１，２の基端は
測定接点３に対する基準接点を形成し、金属素線１と金
属素線２は導線により電位差計に接続される。金属素線
１，２の一方、例えば金属素線１には絶縁物として複数
のアルミナ製の絶縁管４が外挿される。絶縁管４はアル
ミナの代りに、チタニアTiO2，ジルコニアZrO2，マグネ
シアMgO ，硼酸鉛ガラスなどから形成してもよい。絶縁
管４に代わるものとして、例えばアルミナを顆粒状にし
たものを金属素線１の周囲に配するか、アルミナを金属
素線１にコーテイングしてもよい。金属素線１の熱膨張
による応力を緩和するために、測定接点３に近い金属素
線１の先端から５０ｍｍまでの区間には、長さが５ｍｍ
を超えない複数の絶縁管４を用い、金属素線１の先端か
ら５０ｍｍを超える基端側の区間には、長さが１０ｍｍ
の複数のの絶縁管４を用い、続いて長さが２０ｍｍの複
数の絶縁管４を用いる。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described based on the embodiments shown in the drawings. FIG. 1 is a side sectional view showing an overall configuration of a molten metal thermocouple according to a first embodiment of the present invention, and FIG. 2 is an enlarged side sectional view showing a tip portion of the molten metal thermocouple. One of the metal element wires 1 and 2 constituting the thermocouple for molten metal is a Pt (platinum) alloy and the other is a Pt-Rh (platinum-rhodium) alloy pair (JIS R type). The tips of the metal wires 1 and 2 are joined by welding to form a measurement contact 3. The base ends of the metal wires 1 and 2 form a reference contact for the measurement contact 3, and the metal wires 1 and 2 are connected to a potentiometer by a conductive wire. A plurality of insulating tubes 4 made of alumina are externally attached to one of the metal wires 1 and 2, for example, the metal wire 1. The insulating tube 4 may be formed of titania TiO 2 , zirconia ZrO 2 , magnesia MgO, lead borate glass or the like instead of alumina. As an alternative to the insulating tube 4, for example, granular alumina may be provided around the metal wire 1, or alumina may be coated on the metal wire 1. In order to alleviate the stress due to the thermal expansion of the metal wire 1, the length of 5 mm is in the section from the tip of the metal wire 1 close to the measurement contact point 3 to 50 mm.
10 mm in length in the section of the base end side exceeding 50 mm from the tip of the metal element wire 1 using a plurality of insulating tubes 4 not exceeding
The plurality of insulating tubes 4 are used, and subsequently, the plurality of insulating tubes 4 having a length of 20 mm are used.
【０００７】保護管５は窒化珪素系セラミツクから作製
されたものであり、閉鎖された先端部５ａに金属素線
１，２の測定接点３が位置するように、金属素線１，２
が保護管５に挿入・保持される。保護管５は窒化珪素の
代りにサイアロンまたは炭化珪素から作製されてもよ
い。図３に示すように、保護管５の基端は封止部材６に
より封止される。保護管５の外表面は、鋳鉄の金属溶湯
にはモリブデン−硼化ジルコニウムMo−ZrB2混合物，マ
グネシアMgO ，ジルコニアZrO2などの被膜により被覆さ
れるが、銅，真鍮，銀などの溶湯にはマグネシアMgO の
被膜１５により被覆されるのが好ましい。保護管５の内
面は珪素Siの蒸発を防止するために、遮蔽物としてアル
ミナまたはジルコニアの被膜７により被覆されるか、高
温により保護管５から蒸発した珪素成分を吸収するため
に、チタンTi，チタニアTiO2，ジルコニアZrO2などの被
膜７により被覆される。保護管５の内面に施した被膜７
に代えて、珪素成分の蒸発により白金成分が浸食されな
いように金属素線１，２の表面にガラスのコーテイング
を施してもよい。The protective tube 5 is made of a silicon nitride ceramic, and the metal wires 1, 2 are arranged so that the measuring contacts 3 of the metal wires 1, 2 are located at the closed tip 5a.
Is inserted and held in the protective tube 5. The protective tube 5 may be made of sialon or silicon carbide instead of silicon nitride. As shown in FIG. 3, the base end of the protective tube 5 is sealed by the sealing member 6. The outer surface of the protective tube 5 is covered with a film of molybdenum-zirconium boride Mo-ZrB 2 mixture, magnesia MgO, zirconia ZrO 2 or the like for the molten metal of cast iron, but for molten metal such as copper, brass or silver. It is preferably coated with a coating 15 of magnesia MgO. The inner surface of the protective tube 5 is coated with a film 7 of alumina or zirconia as a shield in order to prevent evaporation of silicon Si, or titanium Ti, Ti, in order to absorb the silicon component evaporated from the protective tube 5 due to high temperature. It is covered with a coating 7 such as titania TiO 2 or zirconia ZrO 2 . Coating 7 applied to the inner surface of protective tube 5
Instead of this, glass may be coated on the surfaces of the metal wires 1 and 2 so that the platinum component is not corroded by the evaporation of the silicon component.
【０００８】図３，４に示す第２の実施例は、図１，２
に示す実施例における保護管５の内面の被膜に代えて、
金属素線１，２と保護管５の間に、遮蔽物としてチタン
から形成した筒体８が配置される。筒体８はチタンの代
りに、チタン合金，インコネル，インコロイ，ステンレ
スなどから形成してもよい。筒体８の基端部は保護管５
の基端部から外方へ突出しており、保護管５の基端部と
筒体８とは封止部材６により封止される。保護管５と筒
体８との間隙に、保護管５から発生した揮発成分を吸収
または吸着する物質を充填してもよい。金属素線１，２
の一方、例えば金属素線１には複数のアルミナ製の絶縁
管４が外挿されるなど、他の構成は図１，２に示す実施
例のものと同様である。The second embodiment shown in FIGS. 3 and 4 is shown in FIGS.
Instead of the coating on the inner surface of the protective tube 5 in the embodiment shown in
A cylindrical body 8 made of titanium is arranged as a shield between the metal wires 1 and 2 and the protective tube 5. The cylindrical body 8 may be formed of titanium alloy, inconel, incoloy, stainless steel, or the like instead of titanium. The base end of the cylindrical body 8 is the protective tube 5
Of the protective tube 5 and the cylindrical body 8 are sealed by a sealing member 6. A substance that absorbs or adsorbs a volatile component generated from the protective tube 5 may be filled in the gap between the protective tube 5 and the cylindrical body 8. Metal wires 1 and 2
On the other hand, for example, a plurality of insulating tubes 4 made of alumina are externally attached to the metal element wire 1, and other configurations are similar to those of the embodiment shown in FIGS.
【０００９】図５に示す第３の実施例は、図３の第２の
実施例における筒体８に代えて、チタンから形成した有
底管９を用いたものである。有底管９はチタンの代り
に、チタン合金，インコネル，インコロイ，ステンレス
などから形成してもよい。金属素線１，２の測定接点３
が位置する有底管９の先端部と保護管５との間には、無
機化合物またはセラミツクからなる充填材１０が充填さ
れ、有底管９と保護管５が固定される。図３にも示した
ように、有底管９の基端部は保護管５の基端部から外方
へ突出しており、保護管５の基端部と有底管９とは封止
部材６により固定されかつ封止される。保護管５と有底
管９との間隙に、保護管５から発生した揮発成分を吸収
または吸着する物質を充填してもよい。金属素線１，２
の一方、例えば金属素線１には複数のアルミナ製の絶縁
管４が外挿されるなど、他の構成は図１，２に示す第１
の実施例のものと同様である。The third embodiment shown in FIG. 5 uses a bottomed tube 9 made of titanium in place of the cylindrical body 8 in the second embodiment of FIG. The bottomed tube 9 may be formed of titanium alloy, Inconel, Incoloy, stainless steel, etc. instead of titanium. Measuring contact 3 for metal wires 1 and 2
A filler 10 made of an inorganic compound or ceramics is filled between the tip of the bottomed tube 9 where is located and the protection tube 5, and the bottomed tube 9 and the protection tube 5 are fixed. As shown in FIG. 3, the base end of the bottomed tube 9 projects outward from the base end of the protective tube 5, and the base end of the protective tube 5 and the bottomed tube 9 are sealing members. It is fixed and sealed by 6. The gap between the protective tube 5 and the bottomed tube 9 may be filled with a substance that absorbs or adsorbs the volatile components generated from the protective tube 5. Metal wires 1 and 2
On the other hand, for example, a plurality of insulating tubes 4 made of alumina are externally attached to the metal element wire 1, and other configurations are shown in FIGS.
It is similar to that of the embodiment.
【００１０】第１の実施例において保護管５の内面に施
した被膜７、第２の実施例において金属素線１，２と保
護管５の間に配した筒体８、第３の実施例において金属
素線１，２と保護管５の間に配した有底管９にそれぞれ
代えて、保護管５からの珪素成分の蒸発により白金成分
が浸食されないように、金属素線１，２の表面にガラス
のコーテイングを施してもよい。The coating 7 applied to the inner surface of the protective tube 5 in the first embodiment, the cylindrical body 8 arranged between the metal wires 1 and 2 and the protective tube 5 in the second embodiment, and the third embodiment. In place of the bottomed tubes 9 arranged between the metal wires 1 and 2 and the protective tube 5, in order to prevent the platinum component from being eroded by the evaporation of the silicon component from the protective tube 5, The surface may be coated with glass.
【００１１】以上説明した図１，２に示した第１の実施
例の金属溶湯用熱電対では、保護管５に窒化珪素系のセ
ラミツクを用いたので、温度の急激な変化に耐える即ち
耐熱衝撃性に優れ、保護管５の内面がアルミナまたはジ
ルコニアの被膜７により被覆されるので、保護管５から
の珪素成分の蒸発が防止され、金属素線１，２の白金成
分と保護管５の珪素成分とが反応するのを阻止すること
ができる。また、保護管５の内面がチタンTi，チタニア
TiO2，ジルコニアZrO2などの被膜７により被覆される場
合は、被膜７が保護管５から蒸発した珪素成分を吸収す
るので、金属素線１，２の白金成分と保護管５の珪素成
分とが反応するのを阻止することができる。したがつ
て、金属素線１，２の断線が防止され、金属溶湯用熱電
対の耐久性が向上される。In the above-described molten metal thermocouple of the first embodiment shown in FIGS. 1 and 2, since the protection tube 5 is made of a silicon nitride ceramic, it is resistant to a sudden change in temperature, that is, thermal shock resistance. Since the inner surface of the protective tube 5 is covered with the alumina or zirconia coating 7, the evaporation of the silicon component from the protective tube 5 is prevented, and the platinum component of the metal wires 1 and 2 and the silicon of the protective tube 5 are prevented. It is possible to prevent the components from reacting. In addition, the inner surface of the protective tube 5 is titanium Ti, titania
When the coating 7 is made of TiO 2 , zirconia ZrO 2 or the like, the coating 7 absorbs the silicon component evaporated from the protective tube 5, so that the platinum component of the metal wires 1 and 2 and the silicon component of the protective tube 5 are absorbed. Can be prevented from reacting. Therefore, breakage of the metal wires 1 and 2 is prevented, and the durability of the molten metal thermocouple is improved.
【００１２】図３〜５に示した第２，第３の実施例の金
属溶湯用熱電対では、金属素線１，２と保護管５との間
に、珪素成分を吸収する性質を有するチタンなどの物質
からなる筒体８や有底管９を配したので、温度測定の際
に保護管５に含まれる窒化珪素やシリカから遊離した珪
素ガスが筒体８や有底管９により吸収され、保護管５の
珪素成分と金属素線１，２の白金成分とが反応するのを
阻止することができる。したがつて、金属素線１，２の
断線が防止され、金属溶湯用熱電対の耐久性が向上され
る。In the thermocouples for molten metal of the second and third embodiments shown in FIGS. 3 to 5, titanium having a property of absorbing a silicon component is provided between the metal element wires 1 and 2 and the protective tube 5. Since the cylindrical body 8 and the bottomed tube 9 made of such substances are arranged, the silicon gas released from the silicon nitride and silica contained in the protective tube 5 during the temperature measurement is absorbed by the cylindrical body 8 and the bottomed tube 9. It is possible to prevent the silicon component of the protective tube 5 from reacting with the platinum component of the metal wires 1 and 2. Therefore, breakage of the metal wires 1 and 2 is prevented, and the durability of the molten metal thermocouple is improved.
【００１３】本発明の第１〜第３の実施例の各金属溶湯
用熱電対との比較試験のために、白金Ptと白金−ロジウ
ムPt−Rh合金からなる１対の金属素線１，２に外挿した
絶縁管４をアルミナ焼結体から形成し、窒化珪素からな
る保護管５に絶縁管４を挿入してなる比較用金属溶湯用
熱電対を作製した。本発明による各金属溶湯用熱電対と
比較用金属溶湯用熱電対を用いて、温度１４５０℃の鋳
鉄溶湯の測温試験を繰り返し行つた。図６に示すよう
に、金属溶湯用熱電対の金属素線１，２が断線に至るま
での測温回数は、比較用金属溶湯用熱電対が２００回程
度であるのに対し、本発明による各金属溶湯用熱電対で
は５００回程であり、比較用金属溶湯用熱電対のほぼ
２．５倍の耐久性があることが確認された。For comparison with the thermocouples for molten metal of the first to third embodiments of the present invention, a pair of metal wires 1 and 2 made of platinum Pt and platinum-rhodium Pt-Rh alloy. A thermocouple for a molten metal for comparison was manufactured by forming an insulating tube 4 externally inserted into the alumina sintered body and inserting the insulating tube 4 into a protective tube 5 made of silicon nitride. Using each of the thermocouples for molten metal and the thermocouple for comparative molten metal according to the present invention, the temperature measurement test of the cast iron molten metal having a temperature of 1450 ° C. was repeated. As shown in FIG. 6, according to the present invention, the number of temperature measurements until the metal wires 1 and 2 of the molten metal thermocouple are broken is about 200 times for the comparative molten metal thermocouple. It was confirmed that each of the molten metal thermocouples had about 500 times of durability, which was about 2.5 times as durable as the comparative molten metal thermocouple.
【００１４】上述の鋳鉄溶湯の測温試験において１対の
金属素線１，２の断線の分析を行つた結果、比較用金属
溶湯用熱電対の断線部分を観察してみると、溶損により
断線した形跡があり、これは保護管５の窒化珪素の珪素
成分と金属素線１，２の白金成分とが反応して低融点の
化合物が形成され、低融点の化合物の影響により断線し
ていることが認められた。As a result of analyzing the disconnection of the pair of metal element wires 1 and 2 in the temperature measurement test of the above cast iron molten metal, when observing the disconnection part of the comparative metal molten metal thermocouple, There is a trace of disconnection. This is because the silicon component of the silicon nitride of the protective tube 5 and the platinum component of the metal wires 1 and 2 react to form a compound having a low melting point, which is broken by the influence of the compound having a low melting point. It was recognized that
【００１５】以上は本発明による白金Ptと白金−ロジウ
ムPt−Rh合金との１対の金属素線１，２を用いた JIS R
型の金属溶湯用熱電対についての試験結果であるが、第
１〜第３の実施例の金属溶湯用熱電対の金属素線１，２
の代りに、白金−ロジウムPt−Rh合金の内でロジウムRh
の含有割合が異なる金属素線を用いたもの（ JIS S型の
金属溶湯用熱電対）や、成分が異なるPt−Rh合金の金属
素線を用いたもの（ JIS B型の金属溶湯用熱電対）で
も、先に述べたと同様の耐久性の向上が確認された。The above is JIS R using a pair of metal wires 1 and 2 of platinum Pt and platinum-rhodium Pt-Rh alloy according to the present invention.
It is a test result about the thermocouple for molten metal of the mold, the metal element wires 1 and 2 of the thermocouple for molten metal of the first to third examples.
Instead of rhodium Rh in the platinum-rhodium Pt-Rh alloy,
Using a metal element wire with a different content ratio of (JIS S type metal melt thermocouple) or using a Pt-Rh alloy metal element wire with a different component (JIS B type metal melt thermocouple) ), It was confirmed that the durability was improved as described above.
【００１６】次に、本発明による各金属溶湯用熱電対に
ついて、保護管５の外径の違いによる応答性試験を行つ
た。図７に示ように、保護管５の外径が３．２〜８ｍｍ
では、測定値が所定の値に落ち着くまでの時間は５〜７
秒であつたのに対し、保護管５の外径が８ｍｍを超える
と、応答性が急に悪くなることが確認された。保護管５
の外径が大きくなるにつれて応答性が悪化するので、保
護管５の外径は実用的には８ｍｍを超えないものが望ま
しい。Next, a responsiveness test was carried out for each of the molten metal thermocouples according to the present invention depending on the difference in the outer diameter of the protective tube 5. As shown in FIG. 7, the outer diameter of the protective tube 5 is 3.2 to 8 mm.
Then, it takes 5-7 for the measured value to settle to the specified value.
It was confirmed that when the outer diameter of the protective tube 5 exceeds 8 mm, the responsiveness suddenly deteriorates. Protection tube 5
Since the responsiveness deteriorates as the outer diameter of the protective tube 5 increases, it is desirable that the outer diameter of the protective tube 5 does not exceed 8 mm in practice.
【００１７】[0017]
【発明の効果】本発明は上述のように、各種金属溶湯に
対する耐食性を有する保護膜を外周面に施した保護管
と、保護管に内包される白金群金属を主成分とする金属
素線と、金属素線の外周に配置された絶縁物とを備えた
シース型の金属溶湯用熱電対において、保護管と金属素
線との間に保護管から発生する揮発成分を遮断または吸
着する遮蔽物を配置したものであり、保護管と金属素線
との間に保護管から発生する揮発成分を遮断する遮蔽物
を配置した場合は、保護管からの珪素の蒸発を防止し、
金属素線の白金成分と保護管の珪素成分とが反応するの
を阻止することができる。As described above, the present invention provides a protective tube having a protective film having corrosion resistance against various molten metals on its outer peripheral surface, and a metal element wire containing platinum group metal as a main component, which is contained in the protective tube. In a sheath-type molten metal thermocouple provided with an insulator arranged on the outer periphery of the metal wire, a shield for blocking or adsorbing a volatile component generated from the protection tube between the protection tube and the metal wire When a shield that blocks volatile components generated from the protective tube is arranged between the protective tube and the metal element wire, the evaporation of silicon from the protective tube is prevented,
It is possible to prevent the platinum component of the metal wire from reacting with the silicon component of the protective tube.
【００１８】保護管と金属素線との間に保護管から発生
する揮発成分を吸着する遮蔽物を配置した場合は、遮蔽
物が保護管から蒸発した珪素を吸収するので、金属素線
の白金成分と保護管の珪素成分とが反応するのを阻止す
ることができる。したがつて、金属素線の断線が防止さ
れ、金属溶湯用熱電対の耐久性が向上される。When a shield for adsorbing volatile components generated from the protective tube is arranged between the protective tube and the metal element wire, the shield absorbs silicon evaporated from the protective tube, so that the metal element platinum is used. It is possible to prevent the reaction between the component and the silicon component of the protective tube. Therefore, the breakage of the metal element wire is prevented, and the durability of the molten metal thermocouple is improved.
【００１９】金属素線と保護管との間に珪素を吸収する
性質を有する物質からなる筒体や有底管を配したので、
筒体や有底管により保護管に含まれる窒化珪素やシリカ
から遊離した珪素ガスは吸収され、保護管の珪素成分と
金属素線の白金成分との反応するのを阻止することがで
きる。したがつて、金属素線の断線が防止され、金属溶
湯用熱電対の耐久性が向上される。Since a cylindrical body or a bottomed tube made of a substance having a property of absorbing silicon is arranged between the metal element wire and the protective tube,
The silicon gas released from the silicon nitride and silica contained in the protective tube is absorbed by the cylindrical body and the bottomed tube, and the reaction between the silicon component of the protective tube and the platinum component of the metal wire can be prevented. Therefore, the breakage of the metal element wire is prevented, and the durability of the molten metal thermocouple is improved.
【００２０】金属素線の表面にガラスのコーテイングを
施したので、保護管からの蒸発した珪素成分により金属
素線の白金成分が浸食されることがなく、金属素線の断
線が防止され、金属溶湯用熱電対の耐久性が向上され
る。Since the surface of the metal element wire is coated with glass, the platinum component of the metal element wire is not corroded by the evaporated silicon component from the protective tube, and the metal element wire is prevented from being broken. The durability of the molten metal thermocouple is improved.
【００２１】金属素線に外挿した絶縁管の長さを金属素
線の先端では短く、金属素線の基端側で順次長くするこ
とにより、金属素線の熱膨張による応力が緩和され、金
属素線の断線が防止される。By making the length of the insulating tube extrapolated to the metal element wire short at the tip of the metal element wire and gradually increasing at the base end side of the metal element wire, the stress due to the thermal expansion of the metal element wire is relaxed, Breakage of metal wires is prevented.
【００２２】保護管に窒化珪素またはサイアロンを用い
たので耐熱衝撃性に優れ、保護管の外表面がモリブデン
−硼化ジルコニムMo−ZrB2混合物，マグネシアMgO ，ジ
ルコニアZrO2などの被膜により被覆されるので、金属溶
湯に対する保護管の耐食性が高められる。Since the protective tube is made of silicon nitride or sialon, it has excellent thermal shock resistance, and the outer surface of the protective tube is covered with a film of molybdenum-zirconia boride Mo-ZrB 2 mixture, magnesia MgO, zirconia ZrO 2, etc. Therefore, the corrosion resistance of the protective tube against the molten metal is enhanced.
【図１】本発明の第１の実施例に係る金属溶湯用熱電対
の側面断面図である。FIG. 1 is a side sectional view of a thermocouple for molten metal according to a first embodiment of the present invention.
【図２】同金属溶湯用熱電対の要部を拡大して示す側面
断面図である。FIG. 2 is a side cross-sectional view showing an enlarged main part of the same molten metal thermocouple.
【図３】本発明の第２の実施例に係る金属溶湯用熱電対
の基端部を拡大して示す側面断面図である。FIG. 3 is a side sectional view showing, on an enlarged scale, a base end portion of a thermocouple for molten metal according to a second embodiment of the present invention.
【図４】本発明の第２の実施例に係る金属溶湯用熱電対
の先端部を拡大して示す側面断面図である。FIG. 4 is a side sectional view showing, in an enlarged manner, a tip portion of a thermocouple for molten metal according to a second embodiment of the present invention.
【図５】本発明の第３の実施例に係る金属溶湯用熱電対
の要部を拡大して示す側面断面図である。FIG. 5 is a side sectional view showing, in an enlarged manner, essential parts of a thermocouple for molten metal according to a third embodiment of the present invention.
【図６】本発明の各実施例の金属溶湯用熱電対と比較用
金属溶湯用熱電対との試験結果に基づく耐久性を表す線
図である。FIG. 6 is a diagram showing the durability based on the test results of the molten metal thermocouple of each example of the present invention and the comparative molten metal thermocouple.
【図７】本発明の各実施例の金属溶湯用熱電対の試験結
果に基づく保護管の外径と応答性との関係を表す線図で
ある。FIG. 7 is a diagram showing the relationship between the outer diameter of the protective tube and the response based on the test results of the thermocouple for molten metal of each example of the present invention.
１，２：金属素線 ３：測定接点 ４：絶縁管 ５：保
護管 ５ａ：先端部 ６：封止部材 ７：被膜 ８：筒
体 ９：有底管 １０：充填材 １５：被膜1, 2: Metal element wire 3: Measurement contact point 4: Insulation tube 5: Protective tube 5a: Tip part 6: Sealing member 7: Film 8: Cylindrical body 9: Bottomed tube 10: Filler 15: Film
───────────────────────────────────────────────────── フロントページの続き (72)発明者 岡田 充 神奈川県藤沢市土棚８番地 株式会社い すゞセラミックス研究所内 (72)発明者 大角 和生 神奈川県藤沢市土棚８番地 株式会社い すゞセラミックス研究所内 (72)発明者 北 英紀 神奈川県藤沢市土棚８番地 株式会社い すゞセラミックス研究所内 Ｆターム(参考） 2F056 BP05 BP06 KC06 KC08 KC11 KC18 4K056 FA12 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Mitsuru Okada No. 8 Soil Shelf, Fujisawa City, Kanagawa Prefecture Inside the Suze Ceramics Research Institute (72) Inventor Kazuo Ozumi No. 8 Soil Shelf, Fujisawa City, Kanagawa Prefecture Inside the Suze Ceramics Research Institute (72) Inventor Hideki Kita No. 8 Soil Shelf, Fujisawa City, Kanagawa Prefecture Inside the Suze Ceramics Research Institute F term (reference) 2F056 BP05 BP06 KC06 KC08 KC11 KC18 4K056 FA12
Claims (13)
外周面に施した保護管と、該保護管に内包される白金群
の金属を主成分とする金属素線と、該金属素線の外周に
配置した絶縁物とからなる金属溶湯用熱電対において、
前記保護管と前記金属素線との間に、前記保護管から発
生する揮発成分を遮断または吸着する遮蔽物を配置した
ことを特徴とする金属溶湯用熱電対。1. A protective tube having an outer peripheral surface provided with a protective film having corrosion resistance against molten metal, a metal wire containing platinum group metal contained in the protective tube as a main component, and an outer circumference of the metal wire. In a thermocouple for molten metal, which consists of an insulator placed in
A thermocouple for molten metal, wherein a shield for blocking or adsorbing a volatile component generated from the protective tube is arranged between the protective tube and the metal element wire.
選択的に吸着する遮蔽物が、チタンTi，チタニアTiO2，
ジルコニアZrO2の内の少くとも１つから形成される、請
求項１に記載の金属溶湯用熱電対。2. A shield which selectively adsorbs a gas of a volatile component generated from the protective tube is titanium Ti, titania TiO 2 ,
The thermocouple for molten metal according to claim 1, which is formed from at least one of zirconia ZrO 2 .
る遮蔽物が、アルミナと硼酸鉛ガラスのいずれかからな
る、請求項１に記載の金属溶湯用熱電対。3. The thermocouple for molten metal according to claim 1, wherein the shield for blocking volatile components generated from the protective tube is made of alumina or lead borate glass.
る遮蔽物が、前記保護管の内面に形成した保護管から発
生する揮発成分を遮断する膜、または保護管から発生す
る揮発成分を選択的に吸着する膜である、請求項１に記
載の金属溶湯用熱電対。4. A shield for blocking volatile components generated from the protective tube is selected from a film formed on the inner surface of the protective tube to block volatile components generated from the protective tube, or a volatile component generated from the protective tube. The thermocouple for molten metal according to claim 1, which is a film that is adsorbed selectively.
前記保護管と前記金属素線との間に前記金属素線と接触
しないように配置され、かつ前記筒体または有底管の基
端部は前記保護管の基端部から突出しており、前記保護
管の基端部と前記筒体または有底管とは封止部材により
固定される、請求項１に記載の金属溶湯用熱電対。5. The shield is a cylinder or a bottomed tube,
It is arranged so as not to come into contact with the metal element wire between the protective tube and the metal element wire, and the base end portion of the tubular body or the bottomed tube projects from the base end portion of the protection tube, The thermocouple for molten metal according to claim 1, wherein the base end portion of the protection tube and the tubular body or the bottomed tube are fixed by a sealing member.
保護管と前記有底管との間隙に、前記保護管から発生す
る揮発成分を吸着または吸収する充填材を充填した、請
求項５に記載の金属溶湯用熱電対。6. A filler for adsorbing or absorbing a volatile component generated from the protective pipe is filled in a gap between the protective pipe and the cylindrical body or a gap between the protective pipe and the bottomed pipe. 5. A thermocouple for molten metal according to item 5.
化合物またはセラミツクからなる充填材により充填・固
定される、請求項５，６のいずれかに記載の金属溶湯用
熱電対。7. The thermocouple for molten metal according to claim 5, wherein the protective tube and the bottomed tube are filled and fixed at their tips with a filler made of an inorganic compound or ceramic.
ネル，インコロイ，ステンレスなどの耐熱性金属から形
成される、請求項５〜７のいずれかに記載の金属溶湯用
熱電対。8. The thermocouple for molten metal according to claim 5, wherein the bottomed tube is formed of a heat-resistant metal such as titanium, titanium alloy, inconel, incoloy or stainless steel.
縁物はアルミナ Al2O3，チタニアTiO2，ジルコニアZr
O2，マグネシアMgO ，硼酸鉛ガラスの内の少くとも１つ
からなり、絶縁管の形状にするか、前記金属素線の周囲
に顆粒状にして配するか、前記金属素線にコーテイング
するかのいずれかである、請求項１に記載の金属溶湯用
熱電対。9. An insulator is applied to the metal wire, and the insulator is alumina Al 2 O 3 , titania TiO 2 , zirconia Zr.
Or O 2, magnesia MgO, made from one at least of the lead borate glass, or the shape of the insulating tube, granules a manner or arrangement around the metal wire, to coat the metal filaments The thermocouple for molten metal according to claim 1, which is any one of the following.
端から５０ｍｍまでは５ｍｍを超えないものとし、前記
金属素線の基端側では１０ｍｍ、２０ｍｍと徐々に長さ
を変える、請求項９に記載の金属溶湯用熱電対。10. The length of the insulating tube does not exceed 5 mm up to 50 mm from the tip of the metal wire, and the length gradually changes to 10 mm or 20 mm on the base end side of the metal wire, The thermocouple for molten metal according to claim 9.
から形成され、前記金属素線は白金−ロジウム系合金で
ある、請求項１に記載の金属溶湯用熱電対。11. The thermocouple for molten metal according to claim 1, wherein the protection tube is made of silicon nitride or sialon, and the metal wire is a platinum-rhodium alloy.
ブデン−硼化ジルコニウムMo−ZrB2，マグネシアMgO ，
ジルコニアZrO の内の少くとも１つから形成される、請
求項１に記載の金属溶湯用熱電対。12. A coating applied to the outer surface of the protective tube is molybdenum-zirconium boride Mo-ZrB 2 , magnesia MgO,
The thermocouple for molten metal according to claim 1, which is formed from at least one of zirconia ZrO 2.
請求項１に記載の金属溶湯用熱電対。13. The outer diameter of the protection tube does not exceed 8 mm,
The thermocouple for molten metal according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001184335A JP2003004539A (en) | 2001-06-19 | 2001-06-19 | Thermocouple for molten metal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001184335A JP2003004539A (en) | 2001-06-19 | 2001-06-19 | Thermocouple for molten metal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2003004539A true JP2003004539A (en) | 2003-01-08 |
Family
ID=19024113
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001184335A Pending JP2003004539A (en) | 2001-06-19 | 2001-06-19 | Thermocouple for molten metal |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2003004539A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011072957A1 (en) * | 2009-12-16 | 2011-06-23 | Endress+Hauser Wetzer Gmbh+Co. Kg | Measuring insert for measuring temperatures |
| KR101520832B1 (en) * | 2008-12-24 | 2015-05-18 | 재단법인 포항산업과학연구원 | Method for producing micrometer grade thermocouple |
-
2001
- 2001-06-19 JP JP2001184335A patent/JP2003004539A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101520832B1 (en) * | 2008-12-24 | 2015-05-18 | 재단법인 포항산업과학연구원 | Method for producing micrometer grade thermocouple |
| WO2011072957A1 (en) * | 2009-12-16 | 2011-06-23 | Endress+Hauser Wetzer Gmbh+Co. Kg | Measuring insert for measuring temperatures |
| US9074945B2 (en) | 2009-12-16 | 2015-07-07 | Endress + Hauser Wetzer Gmbh + Co. Kg | Measuring insert for temperature measurement |
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