JP2000178607A - Method for fixing high graphite substance on metallic body - Google Patents
Method for fixing high graphite substance on metallic bodyInfo
- Publication number
- JP2000178607A JP2000178607A JP11347298A JP34729899A JP2000178607A JP 2000178607 A JP2000178607 A JP 2000178607A JP 11347298 A JP11347298 A JP 11347298A JP 34729899 A JP34729899 A JP 34729899A JP 2000178607 A JP2000178607 A JP 2000178607A
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- Prior art keywords
- graphite
- metal layer
- metal body
- metal
- substance
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
- C04B35/52—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbon, e.g. graphite
- C04B35/528—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbon, e.g. graphite obtained from carbonaceous particles with or without other non-organic components
- C04B35/532—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbon, e.g. graphite obtained from carbonaceous particles with or without other non-organic components containing a carbonisable binder
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
- C04B35/52—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbon, e.g. graphite
- C04B35/522—Graphite
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B37/00—Joining burned ceramic articles with other burned ceramic articles or other articles by heating
- C04B37/02—Joining burned ceramic articles with other burned ceramic articles or other articles by heating with metallic articles
- C04B37/023—Joining burned ceramic articles with other burned ceramic articles or other articles by heating with metallic articles characterised by the interlayer used
- C04B37/026—Joining burned ceramic articles with other burned ceramic articles or other articles by heating with metallic articles characterised by the interlayer used consisting of metals or metal salts
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2237/00—Aspects relating to ceramic laminates or to joining of ceramic articles with other articles by heating
- C04B2237/02—Aspects relating to interlayers, e.g. used to join ceramic articles with other articles by heating
- C04B2237/12—Metallic interlayers
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2237/00—Aspects relating to ceramic laminates or to joining of ceramic articles with other articles by heating
- C04B2237/30—Composition of layers of ceramic laminates or of ceramic or metallic articles to be joined by heating, e.g. Si substrates
- C04B2237/32—Ceramic
- C04B2237/36—Non-oxidic
- C04B2237/363—Carbon
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2237/00—Aspects relating to ceramic laminates or to joining of ceramic articles with other articles by heating
- C04B2237/30—Composition of layers of ceramic laminates or of ceramic or metallic articles to be joined by heating, e.g. Si substrates
- C04B2237/40—Metallic
- C04B2237/407—Copper
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2237/00—Aspects relating to ceramic laminates or to joining of ceramic articles with other articles by heating
- C04B2237/50—Processing aspects relating to ceramic laminates or to the joining of ceramic articles with other articles by heating
- C04B2237/70—Forming laminates or joined articles comprising layers of a specific, unusual thickness
- C04B2237/704—Forming laminates or joined articles comprising layers of a specific, unusual thickness of one or more of the ceramic layers or articles
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2237/00—Aspects relating to ceramic laminates or to joining of ceramic articles with other articles by heating
- C04B2237/50—Processing aspects relating to ceramic laminates or to the joining of ceramic articles with other articles by heating
- C04B2237/70—Forming laminates or joined articles comprising layers of a specific, unusual thickness
- C04B2237/706—Forming laminates or joined articles comprising layers of a specific, unusual thickness of one or more of the metallic layers or articles
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2237/00—Aspects relating to ceramic laminates or to joining of ceramic articles with other articles by heating
- C04B2237/50—Processing aspects relating to ceramic laminates or to the joining of ceramic articles with other articles by heating
- C04B2237/70—Forming laminates or joined articles comprising layers of a specific, unusual thickness
- C04B2237/708—Forming laminates or joined articles comprising layers of a specific, unusual thickness of one or more of the interlayers
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2237/00—Aspects relating to ceramic laminates or to joining of ceramic articles with other articles by heating
- C04B2237/50—Processing aspects relating to ceramic laminates or to the joining of ceramic articles with other articles by heating
- C04B2237/76—Forming laminates or joined articles comprising at least one member in the form other than a sheet or disc, e.g. two tubes or a tube and a sheet or disc
- C04B2237/765—Forming laminates or joined articles comprising at least one member in the form other than a sheet or disc, e.g. two tubes or a tube and a sheet or disc at least one member being a tube
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Ceramic Products (AREA)
- Powder Metallurgy (AREA)
Abstract
Description
【０００１】[0001]
【０００２】本発明は、金属体上に高黒鉛物質を固定す
るための方法に関するものである。[0002] The present invention relates to a method for fixing a high graphite substance on a metal body.
【０００３】[0003]
【０００４】数多くの黒鉛用途分野において、有利であ
り、またときには必要なのは、高い熱伝導性および／ま
たは電導性を付与するように金属体に黒鉛を固定するこ
とである。これが当てはまる場合が摺動ビューゲル、地
絡接点、溶解炉内の黒鉛内張りおよび電気接点一般であ
る。[0004] In many graphite applications, it is advantageous and sometimes necessary to fix graphite to a metal body to provide high thermal and / or electrical conductivity. This applies to sliding bugels, ground fault contacts, graphite lining in melting furnaces and electrical contacts in general.
【０００５】現状技術によれば、かかる固定または結合
はろう付けによって作り出されるが、それによって黒鉛
表面は黒鉛材料をろうの中に定着させるために綿密な準
備が必要になる。[0005] According to the state of the art, such a fixation or bonding is created by brazing, whereby the graphite surface requires careful preparation to fix the graphite material in the braze.
【０００６】本発明は固定方法を簡単にし、なおかつ信
頼できる固定を達成するという課題に基づいている。The invention is based on the task of simplifying the fixing method and achieving a reliable fixing.
【０００７】[0007]
【課題を解決するための手段】[Means for Solving the Problems]
【０００８】本発明の課題を解決するための手段は、下
記のとおりである。The means for solving the problems of the present invention are as follows.
【０００９】第１に、高黒鉛物質が硬化可能なジュロプ
ラスト（duroplast）を含有し、高黒鉛成分を含有する
未焼結の加圧物を形成するために単一加圧過程で高金属
層と一緒に加圧され、加圧物が次に金属体と整列され、
また単一の工程で、次に熱処理にかけられ、その間に高
黒鉛材料内のジュロプラストは硬化するだけでなく、そ
の間に高金属層も金属体と緊密な結合を形成することを
特徴とする、金属体の上に高黒鉛物質を固定する方法。
第２に、高黒鉛物質がサーモプラスト（thermoplast）
を含有し、高黒鉛成分を含有する未焼結の加圧物を形成
するために単一加圧過程で高金属層と一緒に加圧され、
また、単一過程で、加圧物が次に金属体と整列され、次
に熱処理にかけられ、その間にサーモプラストは高黒鉛
物質内の黒鉛を固化するだけでなく、その間に高金属層
も金属体と緊密な結合を形成することを特徴とする、金
属体の上に高黒鉛物質を固定する方法。第３に、高黒鉛
物質が、重量比率で８％〜２５％のジュロプラストを含
有することを特徴とする、上記第１に記載の方法。第４
に、高黒鉛物質が、重量比率で３％〜１５％の結合剤の
サーモプラストを含有することを特徴とする、上記第２
に記載の方法。第５に、高金属層が、錫または錫鉛合金
から成ることを特徴とする、上記第１〜４のいずれか一
つに記載の方法。第６に、高金属層を備えた高黒鉛物質
が、銅の金属体上に固定されることを特徴とする、上記
第１〜５のいずれか一つに記載の方法。First, the high graphite material contains curable duroplast, and the high metal layer is combined with the high metal layer in a single pressing process to form a green compact containing the high graphite component. Press together, the press is then aligned with the metal body,
It is also characterized in that in a single step, it is then subjected to a heat treatment, during which not only the duroplasts in the high graphite material harden, but also in the meantime, the high metal layer also forms a tight bond with the metal body. A method of fixing high graphite substances on the body.
Second, the high graphite material is thermoplast
And pressurized together with the high metal layer in a single pressing process to form a green press containing a high graphite component,
Also, in a single step, the compact is then aligned with the metal body and then subjected to a heat treatment, during which time the thermoplast not only solidifies the graphite in the high graphite material, but also the high metal layer A method of fixing a high graphite substance on a metal body, characterized by forming a tight bond with the body. Thirdly, the method according to the above-mentioned 1, wherein the high graphite substance contains 8% to 25% by weight of duroplast. 4th
2. The method according to claim 2, wherein the high graphite material contains 3% to 15% by weight of a thermoplast of a binder.
The method described in. Fifthly, the method according to any one of the first to fourth aspects, wherein the high metal layer is made of tin or a tin-lead alloy. Sixth, the method according to any one of the first to fifth aspects, wherein the high-graphite material having the high-metal layer is fixed on a copper metal body.
【００１０】両方の方法の変型も同じ原理に基づき、ま
た、ろうを始めとする、高金属層と、黒鉛とそれより少
ない比率のプラスチックとから成る、高黒鉛層が単一の
工程で一緒に加圧でき、ついで金属体上に焼結するとい
う単純化を表し、それによって高黒鉛層内のプラスチッ
ク成分は同時に硬化するか、あるいはサーモプラストを
使用している場合に、高黒鉛層は固化する。これによっ
て得られる結果的な未焼結の加圧物は金属体、すなわち
形成された形状と整列され、保護雰囲気の下で、あるい
はそれなしに熱処理にかけられ、それによって黒鉛と可
塑性添加物から成る形成されたものが硬化し高金属層、
すなわち、ろうは金属製の形成されたものとの溶融によ
って耐久性のある結合を形成する。これによって以前の
方法では必要であった中間過程が省略され、より費用効
率の高い製造が達成される。A variant of both methods is based on the same principle, and a high-graphite layer consisting of a high metal layer, including wax, and graphite and a lower proportion of plastic, is combined together in a single step. Represents a simplification that can be pressed and then sintered on a metal body, whereby the plastic component in the high graphite layer hardens at the same time or, if thermoplast is used, solidifies the high graphite layer . The resulting green compact obtained by this is aligned with the metal body, i.e. the formed shape, and subjected to a heat treatment with or without a protective atmosphere, thereby consisting of graphite and plastic additives The formed thing hardens and the high metal layer,
That is, the wax forms a durable bond by melting with the metal formed. This eliminates the intermediate steps required in previous methods and achieves more cost-effective production.
【００１１】用語の説明として、未焼結の加圧物は、非
焼結加圧物と理解される。高金属材料は、金属含有率が
重量で少なくとも５０％の物質である。これに対応し
て、高黒鉛物質は黒鉛含有率が重量で少なくとも５０％
の物質である。By definition, a green compact is understood to be a non-sintered compact. High-metal materials are substances having a metal content of at least 50% by weight. Correspondingly, high graphite materials have a graphite content of at least 50% by weight.
Is a substance.
【００１２】[0012]
【００１３】黒鉛／ＰＰＳ混合物は、８０％の天然黒鉛
と２０％のＰＰＳ粉末を強く混合して調製した。使用し
た天然黒鉛の粒子の８５％は、１００μｍ未満であっ
た。使用したＰＰＳの粒子は、４５μｍ未満であった。
なお、ＰＰＳは硫化ポリフェニレンを意味する。The graphite / PPS mixture was prepared by vigorously mixing 80% of natural graphite and 20% of PPS powder. 85% of the natural graphite particles used were less than 100 μm. The PPS particles used were less than 45 μm.
In addition, PPS means polyphenylene sulfide.
【００１４】圧縮円筒状型に、黒鉛／ＰＰＳ混合物と錫
（Ｓｎ）粉末を装填した。装填は、２つの供給システム
を用いて２段階で実施した。すなわち、黒鉛／ＰＰＳ混
合物が型の中に注がれ、ついで錫粉末が黒鉛／ＰＰＳ混
合物層の上に注がれた。次に、装填物を２層の未焼結の
部品が得られるように加圧した。加えた圧力は、４トン
／ｃｍ2であった。円筒状型の直径は、２０mmであっ
た。A compression cylindrical mold was charged with a graphite / PPS mixture and tin (Sn) powder. Loading was performed in two stages using two feed systems. That is, the graphite / PPS mixture was poured into a mold, and then tin powder was poured over the graphite / PPS mixture layer. Next, the charge was pressed so as to obtain two layers of green parts. The applied pressure was 4 ton / cm 2 . The diameter of the cylindrical mold was 20 mm.
【００１５】黒鉛／ＰＰＳ混合物と錫粉末の量は、黒鉛
／ＰＰＳ混合物層の厚みが１．５±０．１mmに等しく、
錫層の厚みが０．５±０．１mmに等しくなるように調節
された。The amount of the graphite / PPS mixture and tin powder is such that the thickness of the graphite / PPS mixture layer is equal to 1.5 ± 0.1 mm,
The thickness of the tin layer was adjusted to be equal to 0.5 ± 0.1 mm.
【００１６】未焼結の部品は、錫の層の側を、厚さが１
mmである銅の円盤の上に据えるように配置された。これ
らの集合体は、３０分間、温度２９０℃で、１００％Ｎ
2の雰囲気下で焼結された。この焼結作業の結果、一方
では、黒鉛粉末とＰＰＳ粉末の反応によって固体黒鉛／
ＰＰＳ体と、他方では、錫層のろう付け効果によって黒
鉛体と銅の円盤の間の錫接合が得られた。The green part has a thickness of 1 on the side of the tin layer.
It was arranged to rest on a copper disc of mm. These aggregates are kept at 290 ° C. for 30 minutes at 100% N
It was sintered under the atmosphere of 2 . As a result of this sintering operation, on the one hand, solid graphite /
A tin joint between the graphite body and the copper disk was obtained by the brazing effect of the PPS body and, on the other hand, the tin layer.
【００１７】部品は錫接合の強度が極めて高いことが分
かった、また剪断試験では接合部ではなく黒鉛／ＰＰＳ
体が破壊された。The parts were found to have a very high tin bond strength, and in a shear test the graphite / PPS was used instead of the bond.
The body was destroyed.
【００１８】[0018]
【００１９】本発明によると、固定方法を簡単にし、な
おかつ信頼できる固定を達成できる。According to the present invention, the fixing method can be simplified and a reliable fixing can be achieved.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 セブケット ハルマンシ ドイツ連邦共和国，デー−63065 オッフ ェンバッハ，カイザーシュトラッセ 115 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Cebucket Harmansi, Germany, 63065 Offenbach, Kaiserstrasse 115
Claims (6)
を含有し、高黒鉛成分を含有する未焼結の加圧物を形成
するために単一加圧過程で高金属層と一緒に加圧され、
加圧物が次に金属体と整列され、また単一の工程で、次
に熱処理にかけられ、その間に高黒鉛材料内のジュロプ
ラストは硬化するだけでなく、その間に高金属層も金属
体と緊密な結合を形成することを特徴とする、金属体の
上に高黒鉛物質を固定する方法。1. A high-graphite material containing curable duroplasts and pressed together with a high-metal layer in a single pressing process to form a green compact containing high-graphite components. ,
The compact is then aligned with the metal body and subjected to heat treatment in a single step, then heat treatment, during which not only does the duroplast in the high graphite material harden, but also the high metal layer becomes tight with the metal body. A method for fixing a high graphite substance on a metal body, characterized by forming a strong bond.
高黒鉛成分を含有する未焼結の加圧物を形成するために
単一加圧過程で高金属層と一緒に加圧され、また、単一
過程で、加圧物が次に金属体と整列され、次に熱処理に
かけられ、その間にサーモプラストは高黒鉛物質内の黒
鉛を固化するだけでなく、その間に高金属層も金属体と
緊密な結合を形成することを特徴とする、金属体の上に
高黒鉛物質を固定する方法。2. The high graphite substance contains thermoplast,
In a single pressing step, the pressed body is pressed together with the high metal layer to form a green pressed body containing high graphite components, and in a single step, the pressed body is then pressed with the metal body. Metal body, characterized in that it is aligned and then subjected to a heat treatment, during which the thermoplast not only solidifies the graphite in the high graphite material, but also during which the high metal layer also forms a tight bond with the metal body To fix high graphite material on the surface.
のジュロプラストを含有することを特徴とする、請求項
１に記載の方法。3. The high graphite substance has a weight ratio of 8% to 25%.
The method according to claim 1, which comprises the following duroplasts.
の結合剤のサーモプラストを含有することを特徴とす
る、請求項２に記載の方法。4. The high graphite substance has a weight ratio of 3% to 15%.
The method according to claim 2, characterized in that it contains a thermoplast of the binder of the formula (1).
ことを特徴とする請求項１〜４のいずれか一つに記載の
方法。5. The method according to claim 1, wherein the high metal layer comprises tin or a tin-lead alloy.
属体上に固定されることを特徴とする、請求項１〜５の
いずれか一つに記載の方法。6. The method according to claim 1, wherein the high-graphite material provided with the high-metal layer is fixed on a copper metal body.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19856503.8 | 1998-12-07 | ||
| DE1998156503 DE19856503C1 (en) | 1998-12-08 | 1998-12-08 | Graphite is bonded to metal, e.g. in electrical contact or fusion reactor lining production, by applying a metallic layer of a plastic-containing graphite green pressing onto a metallic body and heating |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000178607A true JP2000178607A (en) | 2000-06-27 |
Family
ID=7890323
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11347298A Pending JP2000178607A (en) | 1998-12-07 | 1999-12-07 | Method for fixing high graphite substance on metallic body |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2000178607A (en) |
| DE (1) | DE19856503C1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102008004378A1 (en) | 2008-01-15 | 2009-07-16 | Robert Bosch Gmbh | Forging disk for electric motor of in-tank electrical fuel pump for supplying fuel to e.g. diesel engine, has metallic layer produced from metal particles, where metallic particles are fixedly connectable with one another by binder |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH594972A5 (en) * | 1975-05-28 | 1978-01-31 | Bbc Brown Boveri & Cie |
-
1998
- 1998-12-08 DE DE1998156503 patent/DE19856503C1/en not_active Expired - Fee Related
-
1999
- 1999-12-07 JP JP11347298A patent/JP2000178607A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| DE19856503C1 (en) | 2000-06-29 |
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