JPH05213680A - Production of porous ceramic - Google Patents
Production of porous ceramicInfo
- Publication number
- JPH05213680A JPH05213680A JP35276691A JP35276691A JPH05213680A JP H05213680 A JPH05213680 A JP H05213680A JP 35276691 A JP35276691 A JP 35276691A JP 35276691 A JP35276691 A JP 35276691A JP H05213680 A JPH05213680 A JP H05213680A
- Authority
- JP
- Japan
- Prior art keywords
- ceramic
- porous
- bearing
- porous body
- carbonized
- 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
Classifications
-
- 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
- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/06—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by burning-out added substances by burning natural expanding materials or by sublimating or melting out added substances
- C04B38/063—Preparing or treating the raw materials individually or as batches
- C04B38/0635—Compounding ingredients
- C04B38/0645—Burnable, meltable, sublimable materials
- C04B38/068—Carbonaceous materials, e.g. coal, carbon, graphite, hydrocarbons
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00241—Physical properties of the materials not provided for elsewhere in C04B2111/00
- C04B2111/00284—Materials permeable to liquids
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00793—Uses not provided for elsewhere in C04B2111/00 as filters or diaphragms
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Magnetic Bearings And Hydrostatic Bearings (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、セラミック製の多孔質
絞りを用いた静圧流体軸受や流体のフィルタ等に使用さ
れる多孔質セラミックの製造方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a porous ceramic used for a hydrostatic bearing or a fluid filter using a porous diaphragm made of ceramic.
【０００２】[0002]
【従来の技術】従来における多孔質セラミックの製造方
法は、浴室等で石鹸液を含ませる樹脂製スポンジ、即ち
高分子材料である発泡ウレタンを素材に、これを石膏型
内にセットした後、水とセラミック粒子や焼結助材との
混合液である泥しょう（以下スラリとも言う）を流し込
んで水分を石膏型に吸わせ、セラミック粒子や焼結助材
を石膏型の表面に徐々に着床させて成長させる。このよ
うにするとスポンジを内包し型枠に等しい鋳込品ができ
あがる。一方、鋳込品を乾燥させただけの状態ではセラ
ミック粒子間の結合力は極めて弱く白墨、即ち、黒板に
使用するチョークによく似た感じであるので切削、穴あ
け、或いは、サンドペーパ仕上げ等、様々な機械加工が
可能である。鋳込品を機械加工し形を整えたものは生加
工品と呼ばれる。以上述べた多孔質セラミックは泥しょ
う鋳込成形法と呼ばれる極く一般的な方法で製造され
る。生加工品を焼結すればセラミック粒子間は強固に結
合し、内包する樹脂製スポンジは燃焼して気化するた
め、元々スポンジであった部分が連なった気孔となって
多孔質セラミックが焼成できる。これを焼成品と呼ぶ。
なお、樹脂製スポンジは網目状の格子が立体的に連なっ
た構造をしており、少なくとも、その９割以上が気孔部
分である。このような構造になるのは、発泡時に個別に
膨らんで隣接する風船状の泡の界面がガス圧で、すべて
パンクするためで、気孔部分もすべて連なっているため
多量の水や石鹸液を通過吸収、または、滞留できるのは
周知の事実である。2. Description of the Related Art A conventional method for producing a porous ceramic is to use a resin sponge containing a soap solution in a bathroom or the like, that is, urethane foam, which is a polymer material, which is set in a plaster mold and then water. Slurry (hereinafter also referred to as a slurry), which is a mixed solution of the ceramic particles and the sintering aid, is poured into the gypsum mold to absorb water, and the ceramic particles and the sintering aid are gradually landed on the surface of the gypsum mold. Let it grow. In this way, a sponge containing a sponge and having the same shape as a mold is completed. On the other hand, when the cast product is just dried, the bonding force between the ceramic particles is extremely weak and it has a feeling very similar to chalk, that is, the chalk used on the blackboard, so it can be used for cutting, drilling, sandpaper finishing, etc. It can be machined easily. A cast product that has been machined and shaped is called a raw product. The porous ceramics described above are manufactured by a very general method called a mud casting method. When the green processed product is sintered, the ceramic particles are firmly bonded to each other, and the resin sponge contained therein is burned and vaporized, so that the porous ceramics can be fired by forming pores in which the originally sponge parts are connected. This is called a baked product.
The resin sponge has a structure in which mesh-like lattices are three-dimensionally connected, and at least 90% or more of them are pores. The structure is such that when foaming, it expands individually and the interface of the adjacent bubble-like bubbles is gas pressure, causing all to puncture.Because all the pores are also continuous, a large amount of water or soap solution passes through. It is a well known fact that it can be absorbed or retained.
【０００３】[0003]
【発明が解決しようとする課題】以上述べた多孔質セラ
ミックの製造方法における解決しようとする課題につい
て述べる。第一の課題は、多孔質セラミックの形成母材
である樹脂製スポンジが極めて柔軟で掴みどころが無く
変形しやすいことである。これがスポンジの形状加工を
困難にしている。即ち、刃物を当てる以前に樹脂製スポ
ンジを固定しておくこと自体が難しく、また、刃物で切
ろうとすれば切れる前に変形するため単純な形状であっ
ても精度良く、かつ、狙った形状を得るのは極めて困難
である。とくに複雑な形状であれば尚更で、まったく不
可能に近い。このことは複雑かつ精度の良いセラミック
製の部分多孔質体を成形できない欠点となっている。The problems to be solved in the above-described method for producing a porous ceramic will be described. The first problem is that the resin-made sponge, which is the base material for forming the porous ceramic, is extremely flexible, has no grip, and is easily deformed. This makes shaping the sponge difficult. That is, it is difficult to fix the resin sponge before hitting the blade, and if you try to cut with the blade, it deforms before it cuts, so even if it is a simple shape it is accurate and the desired shape It is extremely difficult to obtain. Especially if it has a complicated shape, it is almost impossible. This is a drawback that a complicated and accurate ceramic partially porous body cannot be formed.
【０００４】第二の課題は、鋳込品の機械加工時に樹脂
製スポンジに刃物が絡んで伸縮するため、元々崩れ易い
鋳込品の崩壊を招く、これは生加工品の表層、特に樹脂
製スポンジとセラミック粒子間との境界に生じる。この
多孔質表層の崩壊は多孔質セラミックを静圧流体軸受の
素材として使用する場合、多孔質表層そのものが流体の
通り道となり、ここでの流体の絞り効果が流体軸受の性
能に致命的な悪影響を与え、結果として流体軸受への適
用を困難にしている欠点となっている。以上、従来技術
における第一の課題は樹脂製スポンジの形状加工不適
性、第二の課題が鋳込品多孔質部の加工崩壊であり、こ
れらが樹脂製スポンジの柔軟性もしくは伸縮性に起因し
ていることを述べた。The second problem is that when the casting product is machined, the resin sponge causes the blade to entangle and expand and contract, which causes collapse of the casting product which is originally liable to collapse. It occurs at the boundary between the sponge and the ceramic particles. When porous ceramic is used as a material for hydrostatic bearings, the collapse of the porous surface layer serves as a passageway for the fluid itself, and the fluid throttling effect here has a fatal adverse effect on the performance of the fluid bearing. As a result, it is a drawback that it is difficult to apply to fluid bearings. As described above, the first problem in the prior art is the inability to process the shape of the resin sponge, and the second problem is the processing collapse of the porous part of the casting, which is caused by the flexibility or stretchability of the resin sponge. That said.
【０００５】本発明は上記の欠点を改善するために提案
されたもので、その目的は、従来の樹脂製スポンジに代
えて、柔軟性もしくは伸縮性をまったく無くするため、
予め、真空中または無酸素雰囲気中で炭化処理せしめた
炭素質の多孔体（以下、炭化多孔体と言う）を多孔質セ
ラミックの製造母材に用いることで、前述の課題をすべ
て解決しようとするものであって、所望形状に加工した
炭化多孔体にセラミックの泥しょうを鋳込成形して多孔
質セラミックを製造し、特定の部分のみが多孔質のセラ
ミック構造体、或いは、この構造体を用いた静圧流体軸
受を実現することにある。The present invention has been proposed in order to improve the above-mentioned drawbacks, and its purpose is to replace the conventional resin sponge with completely no flexibility or stretchability.
Attempts to solve all of the above problems by using a carbonaceous porous body (hereinafter referred to as a carbonized porous body) that has been carbonized in advance in a vacuum or in an oxygen-free atmosphere as a base material for producing a porous ceramic. The porous ceramic is manufactured by casting ceramic sludge into a carbonized porous body that has been processed into a desired shape to produce a porous ceramic, and only a specific part is a porous ceramic structure, or this structure is used. To realize the hydrostatic bearing that was previously used.
【０００６】[0006]
【課題を解決するための手段】上記の目的を達成するた
め、本発明は所望の形状に加工した炭化多孔体にセラミ
ックの泥しょうを鋳込成形する工程と、ついで前記炭化
多孔体を燃焼気化させる工程とを備えることを特徴とす
る多孔質セラミックの製造方法を発明の要旨とするもの
である。In order to achieve the above object, the present invention comprises a step of casting ceramic mud into a carbonized porous body processed into a desired shape, and then burning and vaporizing the carbonized porous body. The present invention is directed to a method for producing a porous ceramic, which is characterized by including the step of:
【０００７】[0007]
【作用】本発明は所望の形状に加工した炭化多孔体にセ
ラミックの泥しょうを鋳込成形し、ついで前記炭化多孔
体を燃焼気化させて多孔質セラミックを得ることによっ
て、加工中に形くずれを生ずることがなく、所望の形状
と寸法精度のよいセラミック体をうることができる。According to the present invention, ceramic sludge is cast into a desired shape and cast into a ceramic shape, and then the carbonized porous body is burned and vaporized to obtain a porous ceramic. It is possible to obtain a ceramic body having a desired shape and dimensional accuracy with no occurrence.
【０００８】[0008]
【実施例】次に本発明の実施例について説明する。な
お、実施例は一つの例示であって、本発明の精神を逸脱
しない範囲で、種々の変更あるいは改良を行い得ること
は言うまでもない。EXAMPLES Next, examples of the present invention will be described. It is needless to say that the embodiment is merely an example, and various modifications and improvements can be made without departing from the spirit of the present invention.
【０００９】図１は多孔質セラミック形成母材の一例を
示した立体図であって、形成母材は炭化多孔体を機械加
工して得たものである。炭化多孔体の素材としては、例
えば発泡フェノール樹脂、或いは、炭素繊維同士を絡み
合わ交点を接着結合したフェルト品等があり、これらを
無酸素雰囲気で焼成することによって適切な炭化多孔体
を製造できるが、これに限るものではなく前述のように
網目状の格子が立体的に連なったような構造を有する炭
化多孔体であればよいことは言うまでもない。尚、従来
の発泡ウレタン製のスポンジを炭化処理すると、これは
熱可塑性の樹脂であるので炭化する前に、収縮流動化し
て多孔体構造が失われるため、そのまま炭化処理を施す
のは無理な点があり、炭化処理前に収縮流動化を防止す
る対策が必要である。炭化多孔体を用いた多孔質セラミ
ックの形成母材は、従来の樹脂製スポンジに特有の柔軟
性や伸縮性を失って、多孔質セラミックの形成母材とし
て好ましい硬さと強度が付与される。即ち、あたかも数
年前に、暖房や料理用の熱源として大量に使用された木
材を炭化処理した炭そのもの、または、煉炭や豆炭に近
い製品となる。この炭化多孔体は、丁度、前述した鋳込
品を乾燥させた状態に良く似た性質をもっている。即
ち、セラミックの鋳込品が白墨、炭化多孔体が炭とすれ
ば両者の性質を容易に想像できる。FIG. 1 is a three-dimensional view showing an example of a porous ceramic forming base material, which is obtained by machining a carbonized porous body. Examples of the material of the carbonized porous body include a foamed phenol resin, or a felt product in which carbon fibers are entangled with each other and the intersections are adhesively bonded, and an appropriate carbonized porous body can be manufactured by firing these in an oxygen-free atmosphere. However, it is needless to say that the carbonized porous body is not limited to this, and may be a carbonized porous body having a structure in which mesh-like lattices are three-dimensionally connected as described above. When a conventional urethane foam sponge is carbonized, it is a thermoplastic resin, so it shrinks and fluidizes before it is carbonized, and the porous structure is lost. Therefore, it is necessary to take measures to prevent shrinkage fluidization before carbonization. The base material for forming a porous ceramic using a carbonized porous body loses the flexibility and stretchability peculiar to the conventional resin sponge, and is provided with hardness and strength preferable as a base material for forming a porous ceramic. In other words, it is a product similar to charcoal obtained by carbonizing wood that was used in large quantities as a heat source for heating and cooking a few years ago, or a product similar to briquette or bean charcoal. This carbonized porous body has a property very similar to the dried state of the above-mentioned cast product. That is, if the ceramic cast product is chalk and the carbonized porous body is charcoal, the properties of both can be easily imagined.
【００１０】以下、具体的に静圧流体軸受への応用とし
て、回転する軸の半径方向を支えるラジアル軸受に使用
される多孔質セラミックの製造を例に説明する。ここで
図１に示した多孔質セラミックの形成母材は、静圧流体
式のラジアル軸受を構成する軸受形成母材で、理解を容
易にするため一部分を破断して示してある。軸受形成母
材１はチューブ２の両端に位置するフランジ３が円筒の
内側に向かって張り出した一体構造を持つ、但し、上側
のフランジの内径は下側のフランジの内径より若干大き
くしてある。尚、従来の樹脂製スポンジであれば、この
ような形状に加工するのは至難のことであることは言う
までもない。As a specific application to a hydrostatic bearing, the production of a porous ceramic used in a radial bearing that supports the rotating shaft in the radial direction will be described below as an example. Here, the porous ceramic forming base material shown in FIG. 1 is a bearing forming base material forming a hydrostatic radial bearing, and a part thereof is cut away for easy understanding. The bearing forming base material 1 has an integral structure in which the flanges 3 located at both ends of the tube 2 project toward the inside of the cylinder, provided that the inner diameter of the upper flange is slightly larger than the inner diameter of the lower flange. Needless to say, it is extremely difficult to process such a shape with a conventional resin sponge.
【００１１】図２は鋳込成形治具の構造例を示した断面
図であって、図１で示した軸受形成母材１の鋳込成形治
具である。４はテーパ軸の内側に通し孔を開けた石膏型
で、軸受形成母材１は石膏型４のテーパ軸に軸受形成母
材１の上下にあるフランジ３の内径差を利用して、はめ
込み固定してある。５は石膏型４の周囲にスラリ６を入
れる容器であって、石膏型４と容器５とは着脱できるよ
う容器５の下方で気密されボルト７で結合してある。以
上が鋳込成形治具の本体で、８は鋳込成形治具本体を搭
載する中央に開口穴を有するベンチであって、９は受け
皿である。また、図中に示す破線１０は石膏型４の表面
に着床して成長したセラミック粒子塊で、その外側形状
を示したものである。このような構造をしているので石
膏型４に炭化多孔体製の軸受形成母材１をセットした
後、容器５内にスラリ６を注ぎ込めば、スラリ６内の水
分は石膏型４に徐々に吸われ、受け皿９内に滴下してい
くし、スラリ６内のセラミック粒子は石膏型４の表面に
着床し、やはり徐々に成長していく。この結果、やがて
スラリ６の水分は無くなり、石膏型４の周囲に軸受形成
母材１を内包する釣り鐘形状の鋳込品が完成する。鋳込
品を治具から外すには、石膏型４と容器５とを結合する
ボルト７を除去し、石膏型４を下方に押し込めば石膏型
４がテーパ軸となっているので、容易に鋳込品であるセ
ラミック粒子塊１０と石膏型４とを分離できることは言
うまでもなく、以下、鋳込品を乾燥させ所望の形状に加
工した後、本焼成すればよい。加えて、軸受形成母材１
を石膏型４とはテーパ軸にはめ込む方法を用いてセット
し、即ち、位置決め固定される。従来の方法では樹脂製
スポンジでの形状を崩さない鋳込成形治具内へのセット
にも難点があった。FIG. 2 is a cross-sectional view showing an example of the structure of the casting molding jig, which is the casting molding jig of the bearing forming base material 1 shown in FIG. Reference numeral 4 is a gypsum mold in which a through hole is formed inside the tapered shaft, and the bearing forming base material 1 is fitted and fixed to the taper shaft of the gypsum mold 4 by utilizing the difference in inner diameters of the flanges 3 above and below the bearing forming base material 1. I am doing it. Reference numeral 5 denotes a container in which the slurry 6 is placed around the gypsum mold 4, and the gypsum mold 4 and the container 5 are hermetically sealed below the container 5 so as to be detachable from each other and connected by bolts 7. The above is the main body of the casting molding jig, 8 is the bench having the opening hole in the center for mounting the casting molding jig main body, and 9 is the tray. Also, a broken line 10 shown in the figure is a ceramic particle lump grown by landing on the surface of the gypsum mold 4 and showing the outer shape thereof. Since the bearing forming base material 1 made of a carbonized porous body is set in the gypsum mold 4 and the slurry 6 is poured into the container 5, the water content in the slurry 6 is gradually added to the gypsum mold 4 because of the above structure. The ceramic particles in the slurry 6 settle on the surface of the gypsum mold 4 and gradually grow. As a result, the water in the slurry 6 will eventually disappear, and a bell-shaped cast product that includes the bearing forming base material 1 around the gypsum mold 4 will be completed. In order to remove the cast product from the jig, the bolt 7 connecting the gypsum mold 4 and the container 5 is removed, and the gypsum mold 4 is pushed downward, so that the gypsum mold 4 has a taper axis. It goes without saying that the ceramic particle agglomerates 10 as the inserts and the gypsum mold 4 can be separated, and thereafter, the cast products may be dried and processed into a desired shape, and then main firing. In addition, the bearing forming base material 1
The gypsum mold 4 is set by a method of fitting on the taper shaft, that is, the gypsum mold 4 is positioned and fixed. In the conventional method, there is a problem in setting in the casting molding jig that does not lose the shape of the resin sponge.
【００１２】図３は静圧流体式ラジアル軸受の構造例
で、理解を助けるため一部を破断して示した立体図で、
前述の軸受形成母材１を内包させた鋳込品から製造した
ものである。１１は軸受、１２は炭化多孔体が焼成によ
り燃焼気化して軸受１１内の完成したセラミック多孔質
部、１３は焼成前に軸受１１の外円筒面１４からセラミ
ック多孔質部１２に向けてドリル加工で多数設けた流体
の供給孔の一つ、１５は軸受１１の内円筒面１６に鉢巻
状に開口した多孔質リングで、以上は鋳込成形による焼
成品であるので一体構造である。１７は軸受１１の内円
筒面１６に極めて小さな隙間を介して、はめ合わされた
回転軸である。なお、軸受１１と回転軸１７との間を微
小隙間にするには、焼成後にダイアモンド砥石等により
軸受１１の内円筒面１６や回転軸１７の外径を精密に研
削加工すればよい。このような構造となっているので、
供給孔１３から高圧流体を供給すれば高圧流体はセラミ
ック多孔質部１２が通路となって、多孔質リング１５か
ら軸受１１と回転軸１７間の微小隙間に放出され、流体
の圧力で軸受と回転軸１７とを非接触で支持でき、静圧
流体式のラジアル軸受が構成できる。FIG. 3 is an example of the structure of a hydrostatic radial bearing, which is a three-dimensional view with a part broken away to facilitate understanding.
It is manufactured from a cast product in which the above-mentioned bearing forming base material 1 is included. Reference numeral 11 is a bearing, 12 is a ceramic porous portion completed in the bearing 11 by burning and vaporizing a carbonized porous body by firing, and 13 is drilled from the outer cylindrical surface 14 of the bearing 11 toward the ceramic porous portion 12 before firing. One of a large number of fluid supply holes 15 is a porous ring that opens in a cylindrical shape on the inner cylindrical surface 16 of the bearing 11. The above is an integral structure because it is a fired product by cast molding. Reference numeral 17 is a rotating shaft fitted to the inner cylindrical surface 16 of the bearing 11 with a very small gap. In order to form a minute gap between the bearing 11 and the rotary shaft 17, the inner cylindrical surface 16 of the bearing 11 and the outer diameter of the rotary shaft 17 may be precisely ground by a diamond grindstone or the like after firing. With this structure,
When the high-pressure fluid is supplied from the supply hole 13, the high-pressure fluid is discharged from the porous ring 15 into the minute gap between the bearing 11 and the rotary shaft 17 through the porous ceramic portion 12 as a passage, and the high-pressure fluid rotates with the bearing due to the fluid pressure. The shaft 17 can be supported without contact, and a hydrostatic radial bearing can be configured.
【００１３】以上、炭化多孔体を形成母材にすれば、従
来の泥しょう鋳込成形法を用いて極めて容易に静圧流体
式のラジアル軸受を製造できることを示した。なお、ラ
ジアル軸受は単なる例であって、本発明がセラミック内
に形成する多孔質部形状の選択自由度や寸法精度、多孔
質表層の品質等を、従来に比べ大幅に高められることを
利用すれば、多孔質セラミックを用いた様々な静圧流体
軸受、例えば、回転する軸の軸方向を支えるスラスト軸
受、直進案内の送り直角方向を支えるスライダ軸受、或
いは、螺旋状の案内である多孔質静圧ねじ等の製造に利
用でき、流体としては気体または液体、例えば空気や油
が使用できること等は言うまでもない。As described above, it has been shown that a hydrostatic radial bearing can be extremely easily manufactured by using the conventional cast molding method by using the carbonized porous body as the forming base material. It should be noted that the radial bearing is merely an example, and the present invention can be used to significantly improve the degree of freedom in selecting the shape of the porous portion formed in the ceramic, the dimensional accuracy, the quality of the porous surface layer, etc. For example, various hydrostatic bearings using porous ceramics, such as thrust bearings that support the axial direction of the rotating shaft, slider bearings that support the feed-perpendicular direction of the straight guide, or porous static bearings that are spiral guides. It goes without saying that it can be used for manufacturing a pressure screw or the like, and gas or liquid such as air or oil can be used as the fluid.
【００１４】[0014]
【発明の効果】以上、説明したように本発明によれば、
所望の形状に加工した炭化多孔体にセラミックの泥しょ
うを鋳込成形する工程と、ついで前記炭化多孔体を燃焼
気化させる工程とを備えることによって、炭化多孔体を
形成母材とした多孔質セラミックは、従来の樹脂製スポ
ンジを形成母材とする方法に比べ、はるかにバリエイシ
ョンに富んだ形状と寸法精度の良い形成母材を通常の機
械加工を用いて容易、かつ安価に製作でき、鋳込成形治
具へのセットも簡単である。また、これを用いて製造し
たセラミック鋳込品の形状加工においても、内包する炭
化多孔体とセラミック粒子間の機械的強度が似たような
性質であるので、従来のように刃物が樹脂製スポンジに
絡んで鋳込品の表層が崩壊するような事態も避けられる
ため、多孔質表層の品質が極めて良好な多孔質セラミッ
クを内包するセラミック焼成品を製造できる等々、様々
な効果がある。さらに、ラジアル軸受を一例とした静圧
流体軸受の製作で説明したように、軸受面の限られた特
定の箇所のみを多孔質にしたり、内包する多孔質部を流
体の通路とする必要がある静圧流体軸受の製作に本発明
の製造方法を用いれば、従来、製作不可能であった静圧
流体軸受を高品質、且つ、安価に提供できる効果を与え
ることができる。As described above, according to the present invention,
Porous ceramic using the carbonized porous body as a base material by including a step of casting ceramic mud into a carbonized porous body processed into a desired shape, and a step of burning and vaporizing the carbonized porous body. Compared with the conventional method that uses a resin sponge as the forming base material, it is possible to easily and inexpensively form a forming base material with much more variety of shapes and dimensional accuracy using ordinary machining, and cast it. Easy to set on the molding jig. Also, in the shape processing of the ceramic cast product manufactured using this, since the mechanical strength between the carbonized porous body and the ceramic particles is similar, the blade is made of resin sponge as in the past. Since it is possible to prevent the surface layer of the cast product from collapsing due to entanglement with the ceramics, it is possible to produce a ceramic fired product containing a porous ceramic having a very good quality of the porous surface layer. Further, as described in the manufacture of a hydrostatic bearing using a radial bearing as an example, it is necessary to make only a limited specific portion of the bearing surface porous, or to use the enclosed porous portion as a fluid passage. If the manufacturing method of the present invention is used for manufacturing a hydrostatic bearing, it is possible to provide a hydrostatic bearing that has been impossible to manufacture in the past with high quality and at low cost.
【図１】多孔質セラミックの形成母材の一例を示した立
体図である。FIG. 1 is a three-dimensional view showing an example of a base material for forming a porous ceramic.
【図２】鋳込成形する治具の構造例を示した断面図であ
る。FIG. 2 is a cross-sectional view showing a structural example of a jig for casting.
【図３】静圧流体式ラジアル軸受の構造例を示した立体
図である。FIG. 3 is a three-dimensional view showing a structural example of a hydrostatic radial bearing.
１ 軸受形成母材 ２ チューブ ３ フランジ ４ 石膏型 ５ 容器 ６ スラリ ７ ボルト ８ ベンチ ９ 受け皿 １０ セラミック粒子塊 １１ 軸受 １２ セラミック多孔質部 １３ 供給孔 １４ 外円筒面 １５ 多孔質リング １６ 内円筒面 １７ 回転軸 DESCRIPTION OF SYMBOLS 1 Bearing forming base material 2 Tube 3 Flange 4 Gypsum type 5 Container 6 Slurry 7 Bolt 8 Bench 9 Receiving tray 10 Ceramic particle mass 11 Bearing 12 Ceramic porous portion 13 Supply hole 14 Outer cylindrical surface 15 Porous ring 16 Inner cylindrical surface 17 Rotation axis
Claims (1)
ミックの泥しょうを鋳込成形する工程と、ついで前記炭
化多孔体を燃焼気化させる工程とを備えることを特徴と
する多孔質セラミックの製造方法。1. A method for producing a porous ceramic, comprising: a step of casting ceramic mud into a carbonized porous body processed into a desired shape; and a step of burning and vaporizing the carbonized porous body. Method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35276691A JPH05213680A (en) | 1991-12-16 | 1991-12-16 | Production of porous ceramic |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35276691A JPH05213680A (en) | 1991-12-16 | 1991-12-16 | Production of porous ceramic |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05213680A true JPH05213680A (en) | 1993-08-24 |
Family
ID=18426296
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP35276691A Pending JPH05213680A (en) | 1991-12-16 | 1991-12-16 | Production of porous ceramic |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05213680A (en) |
-
1991
- 1991-12-16 JP JP35276691A patent/JPH05213680A/en active Pending
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