JP2724746B2 - Method for producing ceramic tubular body - Google Patents
Method for producing ceramic tubular bodyInfo
- Publication number
- JP2724746B2 JP2724746B2 JP1110333A JP11033389A JP2724746B2 JP 2724746 B2 JP2724746 B2 JP 2724746B2 JP 1110333 A JP1110333 A JP 1110333A JP 11033389 A JP11033389 A JP 11033389A JP 2724746 B2 JP2724746 B2 JP 2724746B2
- Authority
- JP
- Japan
- Prior art keywords
- core
- ceramic
- tubular body
- core material
- ceramic 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
Description
【発明の詳細な説明】 産業上の利用分野 この発明はセラミックを素材としてパイプなどの管状
体を得る方法に関するものである。Description: TECHNICAL FIELD The present invention relates to a method for obtaining a tubular body such as a pipe using ceramic as a raw material.
従来の技術 セラミック粉末を素材とした製品の一般的な製造方法
として、静水圧成形や押し出し成形あるいは射出成形も
しくはスリップキャスティングなどの方法によって成形
体を先ず作り、これを焼結する方法が知られている。こ
れらの方法で管状体を製造する場合、例えば静水圧成形
による場合には、棒状の中子を組込んだゴム型を使用
し、そのゴム型の内部にセラミック粉末を充填するとと
もにこれを加圧媒体中で加圧し、しかる後に中子を成形
体から抜き取り、ついで成形体を焼成することになる。
また押し出し成形や射出成形による場合には、マンドレ
ルなどの心材を有する型を使用し、合成樹脂などと混練
して粘結性および流動性を付与したセラミック材料をそ
の型から押し出し、もしくは射出して中空状の成形体を
作り、しかる後に脱脂などの必要な処理を施した後に焼
成を行なう。さらにスリップキャスティングによる場合
には、心材となる棒状の突出部を備えた型の中にセラミ
ック粉末を分散媒と共に注入し、その分散媒を型に浸透
させて吸収し、その結果得られた中空状の成形体を焼成
することになる。2. Description of the Related Art As a general method of manufacturing a product using ceramic powder as a material, a method of first forming a molded body by a method such as hydrostatic molding, extrusion molding, injection molding or slip casting, and then sintering it is known. I have. When producing a tubular body by these methods, for example, by hydrostatic molding, a rubber mold incorporating a rod-shaped core is used, and the inside of the rubber mold is filled with ceramic powder and pressed. Pressure is applied in the medium, after which the core is removed from the molded body, and then the molded body is fired.
In the case of extrusion molding or injection molding, use a mold having a core material such as a mandrel, and extrude or inject a ceramic material that has been given kneading and fluidity by kneading with synthetic resin etc. A hollow molded body is formed, and then subjected to necessary treatment such as degreasing, and then fired. Furthermore, in the case of slip casting, ceramic powder is injected together with a dispersion medium into a mold having a rod-shaped protrusion serving as a core material, and the dispersion medium is penetrated and absorbed into the mold, and the resulting hollow shape is obtained. Will be fired.
さらに特に静水圧成形を利用してセラミックパイプを
得る方法として、先ず静水圧成形によって円柱体を作
り、これを仮焼結してある程度の剛性を付与し、その仮
焼結体に機械加工によって穿孔し、ついで本焼結する方
法や、棒状の中子を低融点金属で形成しておき、静水圧
成形後の焼結工程で中子を溶融除去する方法が知られて
いる。In particular, as a method of obtaining a ceramic pipe by using hydrostatic pressing, first, a cylindrical body is formed by hydrostatic pressing, which is temporarily sintered to impart a certain degree of rigidity, and the temporarily sintered body is drilled by machining. Then, a method of main sintering or a method of forming a rod-shaped core with a low melting point metal and melting and removing the core in a sintering step after isostatic pressing are known.
発明が解決しようとする課題 しかるに静水圧成形によって中空状の成形体を得る場
合、心材である中子と成形体とが強固に嵌合した状態に
なるうえに、特にその軸長が長い場合には、セラミック
粉末の圧縮率が全ての部分で必ずしも均一ではないため
に、中子を抜き取る際に成形体に亀裂が入ったり割れが
生じたりするなどのおそれが多分にあり、中子の抜き取
りが困難である問題がある。また押し出し成形や射出成
形による場合には、成形体の剛性の点での制約や成形型
からの制約で薄肉で長尺の成形体を得ることが困難であ
るなどの不都合がある。このような事情はスリップキャ
スティングによって成形体を得る場合にも同様である。Problems to be Solved by the Invention However, when a hollow molded body is obtained by isostatic pressing, in addition to a state in which the core, which is the core material, and the molded body are firmly fitted, especially when the axial length is long, Because the compression ratio of the ceramic powder is not always uniform in all parts, there is a possibility that the molded body may crack or break when extracting the core, and the core is not extracted. There are problems that are difficult. In the case of extrusion molding or injection molding, there is an inconvenience that it is difficult to obtain a thin and long molded body due to restrictions on the rigidity of the molded body and restrictions from a molding die. Such a situation is the same when a molded body is obtained by slip casting.
また仮焼結した円柱体に穿孔加工を施してセラミック
製管状体を得る方法で、仮焼結や穿孔加工などの工程を
介在させる必要があるために、工程数が多くなり、しか
も仮焼結体の穿孔加工に時間を要するのみならずその切
削工具の摩耗の進行が速く、加工コストが高くなるなど
の不都合がある。また中子を低融点金属で形成してお
き、これを焼結の際に溶融させる方法では、中子を形成
している金属が微量残存してセラミック製品に悪影響を
及ぼしたり、セラミックと反応して他の物質が精製され
てしまうなどの不都合がある。In addition, in the method in which a pre-sintered cylindrical body is perforated to obtain a ceramic tubular body, it is necessary to intervene in steps such as pre-sintering and perforation processing. Not only does the drilling of the body take time, but the wear of the cutting tool also progresses rapidly, and the machining cost increases. In a method in which the core is formed of a low melting point metal and is melted during sintering, a small amount of the metal forming the core remains and adversely affects the ceramic product or reacts with the ceramic. Therefore, other substances may be purified.
そして上述した従来のいずれの方法も最終的には成形
体の焼結を行なうが、焼結には長時間（例えば１〜２
日）を要し、また焼結の際に亀裂や割れなどが生じ、不
良品が発生する問題があった。In any of the conventional methods described above, the compact is finally sintered, but the sintering takes a long time (for example, 1 to 2).
), And cracks and cracks occur during sintering, resulting in defective products.
この発明は上記の事情を背景としてなされたもので、
長尺の管状体を容易に製造することのできる方法を提供
することを目的とするものである。The present invention has been made in view of the above circumstances,
It is an object of the present invention to provide a method capable of easily producing a long tubular body.
課題を解決するための手段 この発明は、上記の目的を達成するために、心材を可
撓性材料によって筒状に形成しておき、その心材の外周
にセラミック粉末を所定厚さに溶射してセラミック層を
形成し、しかる後に前記心材を機械的外力により変形さ
せてセラミック層の内周から心材を剥離して取除くこと
を特徴とする方法である。Means for Solving the Problems According to the present invention, in order to achieve the above object, a core material is formed in a cylindrical shape from a flexible material, and ceramic powder is sprayed to a predetermined thickness on an outer periphery of the core material. The method is characterized in that a ceramic layer is formed, and thereafter, the core is deformed by a mechanical external force to peel and remove the core from the inner periphery of the ceramic layer.
作用 この発明の方法では、先ず心材の外周にセラミック粉
末を所定の厚さまで溶射し、セラミック層を形成する。
その心材は、可撓性材料を筒状に形成したものであり、
溶射の際には筒状を保持するためにセラミック層は環状
に形成される。セラミック層を所定の厚さまで形成した
後に心材を変形させつつセラミック層の内周から剥離す
れば、セラミック層から心材が取除かれてセラミック製
管状体が得られる。According to the method of the present invention, first, ceramic powder is sprayed to a predetermined thickness on the outer periphery of the core material to form a ceramic layer.
The core is formed of a flexible material in a cylindrical shape,
At the time of thermal spraying, the ceramic layer is formed in an annular shape in order to maintain a cylindrical shape. After the ceramic layer is formed to a predetermined thickness, the core material is peeled off from the inner periphery of the ceramic layer while deforming the core material, whereby the core material is removed from the ceramic layer to obtain a ceramic tubular body.
実 施 例 つぎにこの発明を実施例に基づいて詳細に説明する。Embodiments Next, the present invention will be described in detail based on embodiments.
第１図はこの発明の方法の一実施状況を示す概略図で
あって、符号１は溶射用のトーチを示している。このト
ーチ１としては直流アークプラズマトーチや高周波プラ
ズマトーチあるいはアセチレン炎溶射用トーチなどを使
用することができ、また得るべき管状体の原料であるセ
ラミック粉末はトーチ１の先端部に開口するよう取付け
た供給管２からプラズマジェット３あるいはアセチレン
炎中に送り出される。ここで使用されるセラミック粉末
は、アルミナ（Al2O3）、イットリア安定化ジルコニア
（YSZ）、カルシア安定化ジルコニア（CSZ）、ペロブス
カイト型複合酸化物、炭化ケイ素（SiC）などであり、
このセラミック粉末は前記供給管２からプラズマジェッ
ト３中に送り出されて加熱溶融し、心材４に高速で吹き
付けられる。この心材４は金属メッシュや金属シートな
どの可撓性のある材料を筒状に巻いたものであり、得る
べき管状体の内径程度の外径でかつ得るべき管状体の軸
長以上の長さに設定されている。FIG. 1 is a schematic view showing one embodiment of the method of the present invention, and reference numeral 1 indicates a torch for thermal spraying. As the torch 1, a DC arc plasma torch, a high-frequency plasma torch, an acetylene flame spraying torch, or the like can be used, and a ceramic powder, which is a raw material of a tubular body to be obtained, is attached to the tip of the torch 1 so as to open. The gas is sent out from the supply pipe 2 into the plasma jet 3 or acetylene flame. The ceramic powder used here is alumina (Al 2 O 3 ), yttria-stabilized zirconia (YSZ), calcia-stabilized zirconia (CSZ), perovskite-type composite oxide, silicon carbide (SiC), etc.
The ceramic powder is sent out from the supply pipe 2 into the plasma jet 3 to be heated and melted, and is blown onto the core 4 at a high speed. The core material 4 is formed by winding a flexible material such as a metal mesh or a metal sheet into a cylindrical shape, and has an outer diameter approximately equal to the inner diameter of the tubular body to be obtained and a length equal to or longer than the axial length of the tubular body to be obtained. Is set to
上記の心材４に対するセラミック粉末の溶射は、心材
４をその上下両端部あるいは内周から保持してこれを回
転させつつ、もしくはトーチ１を心材４を中心に回転さ
せつつ行ない、かつ同時に心材４もしくはトーチ１を心
材４の軸線方向に移動させ、これにより溶融したセラミ
ックを心材４の外周に均一に付着させ、そのセラミック
層５が所定の厚さになるまで継続する。その場合、得る
べき管状体が薄肉でかつ長尺であっても、可撓性のシー
ト材を筒状に形成することによりある程度の剛性を付与
した心材４を介して保持されるから、折損や欠損などの
不都合が生じるおそれは極めて少ない。またプラズマ溶
射を行なえば、セラミック材料が高速で心材４に吹き付
けられるので、セラミック層５は理論密度に近い密度と
なる。第２図は心材４の外周に所定の厚さまでセラミッ
ク層５を形成した状態を示す。The above-described spraying of the ceramic powder onto the core 4 is performed while rotating the core 4 while holding the core 4 from the upper and lower ends or the inner circumference thereof, or while rotating the torch 1 about the core 4, and simultaneously performing the core 4 or The torch 1 is moved in the axial direction of the core 4 so that the molten ceramic is uniformly attached to the outer periphery of the core 4 and the ceramic layer 5 is continued until the ceramic layer 5 has a predetermined thickness. In this case, even if the tubular body to be obtained is thin and long, the tubular body is held through the core member 4 having a certain rigidity by forming a flexible sheet material into a tubular shape, so that breakage or breakage can occur. The risk of inconvenience such as loss is extremely low. When plasma spraying is performed, the ceramic material is sprayed on the core 4 at a high speed, so that the ceramic layer 5 has a density close to the theoretical density. FIG. 2 shows a state in which the ceramic layer 5 is formed on the outer periphery of the core 4 to a predetermined thickness.
以上のようにして溶射を行なった後に、心材４を変形
させてセラミック層５の内周面から剥離して取除く。そ
の場合、筒状に巻いた可撓性材料の一端部に金属棒や金
属線などを予め取付けておけば、これらの金属棒や金属
線を例えば引張って心材４を変形させ、心材４をセラミ
ック層５の内周面から容易に剥離させることができる。After performing the thermal spraying as described above, the core material 4 is deformed and peeled off from the inner peripheral surface of the ceramic layer 5 to be removed. In this case, if a metal rod or a metal wire is previously attached to one end of the flexible material wound into a cylindrical shape, the core material 4 is deformed by, for example, pulling the metal rod or the metal wire, and the core material 4 is made of ceramic. It can be easily peeled off from the inner peripheral surface of the layer 5.
このようにして得られた管状体は、その素材であるセ
ラミック粉末の粒子が融合一体化したものであるから必
要とする剛性・強度を備えており、セラミック製品の製
造の際に従来行なっていた焼成工程が不要になる。The thus obtained tubular body has the required rigidity and strength because the particles of the ceramic powder as the material are fused and integrated, and has conventionally been used in the production of ceramic products. A firing step is not required.
発明の効果 以上の説明から明らかなようにこの発明の方法では、
セラミック粉末を溶射して管状に形成するから、焼結作
業を行なうことなく直ちに管状体を得ることができ、ま
た心材は可撓性材料によって筒状に形成したものであっ
て、溶射の後に機械的外力により変形させてセラミック
層の内周面から容易に剥離させることができるために、
心材の除去が容易であり、したがってこの発明の方法に
よれば、容易かつ短時間にセラミック製の管状体を製造
することができる。またこの発明では心材を溶融させず
に取除くから、セラミック製管状体に異種材料が残存し
たり、セラミック材料と反応したりすることを防止でき
る。そしてこの発明によれば、溶融したセラミック粉末
が高速で衝突して互いに融合一体化するために、焼成を
特に行なわずに高密度で高強度のセラミック製管状体を
得ることができる。Effect of the Invention As is clear from the above description, in the method of the present invention,
Since the ceramic powder is formed into a tubular shape by thermal spraying, a tubular body can be obtained immediately without performing sintering work, and the core material is formed of a flexible material into a tubular shape. Because it can be easily separated from the inner peripheral surface of the ceramic layer by being deformed by the external force,
The core material is easily removed, and therefore, according to the method of the present invention, a ceramic tubular body can be manufactured easily and in a short time. Further, in the present invention, since the core material is removed without melting, it is possible to prevent the foreign material from remaining in the ceramic tubular body or reacting with the ceramic material. According to the present invention, since the molten ceramic powders collide at a high speed and fuse and integrate with each other, a high-density and high-strength ceramic tubular body can be obtained without performing firing in particular.
第１図はこの発明の方法の一実施状況を示す概略図、第
２図は心材の外周に付着させたセラミック層を示す模式
的な斜視図である。 １……トーチ、２……供給管、３……プラズマジェッ
ト、４……心材、５……セラミック層。FIG. 1 is a schematic view showing an embodiment of the method of the present invention, and FIG. 2 is a schematic perspective view showing a ceramic layer adhered to the outer periphery of a core material. 1 ... torch, 2 ... supply pipe, 3 ... plasma jet, 4 ... core material, 5 ... ceramic layer.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 長谷川 正一 東京都江東区木場１丁目５番１号 藤倉 電線株式会社内 (72)発明者 丹 正之 東京都江東区木場１丁目５番１号 藤倉 電線株式会社内 (72)発明者 山之内 宏 東京都江東区木場１丁目５番１号 藤倉 電線株式会社内 (56)参考文献 特開 昭59−209105（ＪＰ，Ａ) 特開 昭59−222308（ＪＰ，Ａ) 特開 昭61−206604（ＪＰ，Ａ) 特開 昭62−173215（ＪＰ，Ａ) ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Shoichi Hasegawa 1-5-1 Kiba, Koto-ku, Tokyo Inside Fujikura Electric Wire Co., Ltd. (72) Inventor Masayuki Tan 1-1-5-1 Kiba, Koto-ku, Tokyo Fujikura Inside the Electric Wire Co., Ltd. (72) Inventor Hiroshi Yamanouchi 1-5-1, Kiba, Koto-ku, Tokyo Fujikura Electric Wire Co., Ltd. (56) References JP-A-59-209105 (JP, A) JP-A-59-222308 ( JP, A) JP-A-61-206604 (JP, A) JP-A-62-173215 (JP, A)
Claims (1)
おき、その心材の外周にセラミック粉末を所定厚さに溶
射してセラミック層を形成し、しかる後に前記心材を機
械的外力により変形させてセラミック層の内周から心材
を剥離して取除くことを特徴とするセラミック製管状体
の製造方法。1. A core material is formed in a cylindrical shape from a flexible material, and a ceramic layer is formed by spraying ceramic powder to a predetermined thickness on an outer periphery of the core material, and thereafter the core material is formed by a mechanical external force. A method for manufacturing a ceramic tubular body, comprising deforming and removing a core material from an inner periphery of a ceramic layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1110333A JP2724746B2 (en) | 1989-04-28 | 1989-04-28 | Method for producing ceramic tubular body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1110333A JP2724746B2 (en) | 1989-04-28 | 1989-04-28 | Method for producing ceramic tubular body |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02289306A JPH02289306A (en) | 1990-11-29 |
| JP2724746B2 true JP2724746B2 (en) | 1998-03-09 |
Family
ID=14533085
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1110333A Expired - Fee Related JP2724746B2 (en) | 1989-04-28 | 1989-04-28 | Method for producing ceramic tubular body |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2724746B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9452548B2 (en) | 2011-09-01 | 2016-09-27 | Watt Fuel Cell Corp. | Process for producing tubular ceramic structures |
| JP6272361B2 (en) * | 2014-01-30 | 2018-01-31 | 京セラ株式会社 | Plasma cylinder, plasma apparatus, gas laser apparatus, and method of manufacturing plasma cylinder |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59209105A (en) * | 1983-05-13 | 1984-11-27 | 三菱重工業株式会社 | Method of molding ceramics product |
| JPS59222308A (en) * | 1983-06-01 | 1984-12-14 | 九州耐火煉瓦株式会社 | Manufacture of thin product made of ceramics |
| JPS61206604A (en) * | 1985-03-12 | 1986-09-12 | 大阪富士工業株式会社 | Manufacture of ceramic pipe |
| DE3601869A1 (en) * | 1986-01-23 | 1987-07-30 | Elastogran Masch Bau | TEST DEVICE FOR MIXING DEVICES FOR MULTI-COMPONENT PLASTICS, IN PARTICULAR POLYURETHANE |
-
1989
- 1989-04-28 JP JP1110333A patent/JP2724746B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02289306A (en) | 1990-11-29 |
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| LAPS | Cancellation because of no payment of annual fees |