JPS62278175A - Manufacture of porous ceramics - Google Patents
Manufacture of porous ceramicsInfo
- Publication number
- JPS62278175A JPS62278175A JP12006486A JP12006486A JPS62278175A JP S62278175 A JPS62278175 A JP S62278175A JP 12006486 A JP12006486 A JP 12006486A JP 12006486 A JP12006486 A JP 12006486A JP S62278175 A JPS62278175 A JP S62278175A
- Authority
- JP
- Japan
- Prior art keywords
- binder
- granules
- water
- porous ceramics
- granulated
- 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
- 239000000919 ceramic Substances 0.000 title claims description 26
- 238000004519 manufacturing process Methods 0.000 title claims description 8
- 239000011230 binding agent Substances 0.000 claims description 16
- 239000008187 granular material Substances 0.000 claims description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- 239000000843 powder Substances 0.000 claims description 10
- 239000002994 raw material Substances 0.000 claims description 10
- 239000007921 spray Substances 0.000 claims description 6
- 230000001590 oxidative effect Effects 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 3
- 238000004898 kneading Methods 0.000 claims description 2
- 238000010304 firing Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 238000005469 granulation Methods 0.000 description 6
- 230000003179 granulation Effects 0.000 description 6
- 238000000465 moulding Methods 0.000 description 6
- 239000003085 diluting agent Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000011324 bead Substances 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000003960 organic solvent Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 239000011164 primary particle Substances 0.000 description 2
- 238000007569 slipcasting Methods 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 229910005091 Si3N Inorganic materials 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000002923 metal particle Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
Landscapes
- Ceramic Products (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
３発明の詳細な説明
〔産業上の利用分野〕
本発明は、多孔質セラミックスの製造法に関し、特に、
気体および液体のｒ通用セラミックスフィルタとして好
適な多孔質セラミックスの製造法に関する。[Detailed Description of the Invention] 3. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a method for producing porous ceramics, and in particular,
The present invention relates to a method for producing porous ceramics suitable for general purpose ceramic filters for gases and liquids.
゛濾過用フィルタとしては、金属粒を固着させた金属フ
ィルタやプラスチック・ビーズを固着させたプラスチッ
クフィルタがある。両者共、所定の粒径のビーズの表面
を溶融あるいは溶解して圧着させたものである。Filters include metal filters to which metal particles are fixed and plastic filters to which plastic beads are fixed. Both are made by melting or dissolving the surfaces of beads of a predetermined particle size and pressing them together.
しかし、金属フィルタは耐食及び耐酸化性の問題があり
、腐食性の液体あるいは気体の濾過には使用できない。However, metal filters have corrosion and oxidation resistance problems and cannot be used to filter corrosive liquids or gases.
また、プラスチックフィルタも耐熱性の問題があり、低
温の濾過にしか適用できない欠点があった。Furthermore, plastic filters also have the problem of heat resistance, and have the disadvantage that they can only be applied to low-temperature filtration.
本発明は、上記欠点を解消するため、気体および液体の
ＦＡ用フィルタとして好適な多孔質フィルタを製造する
方法を提供することを目的とする。SUMMARY OF THE INVENTION In order to eliminate the above-mentioned drawbacks, it is an object of the present invention to provide a method for manufacturing a porous filter suitable as a gas and liquid FA filter.
本発明は、上記目的を達成するため、セラミックス原料
粉末を造粒して顆粒にする際に、特定条件下で仮焼成を
行うものである。In order to achieve the above object, the present invention performs temporary firing under specific conditions when granulating ceramic raw material powder into granules.
すなわち、不発明はセラミックス粉体を造粒した顆粒に
新たにバインダーを添加し、成形して得られた成形体を
焼成して焼結体とする多孔質セラミックスの製造方法に
おいて、前記セラミックス顆粒として、セラミックス原
料粉体に有機バインダと水を添加して混練した後、これ
をスプレードライヤによシ造粒し、この後１０００℃以
上で大気あるいは非酸化雰囲気中で仮焼成したものを用
いることを特徴とする多孔質セラミックスの製造法であ
る。That is, the non-invention is a method for producing porous ceramics in which a binder is newly added to granules obtained by granulating ceramic powder, and the resulting molded body is fired to obtain a sintered body. After adding an organic binder and water to ceramic raw material powder and kneading it, this is granulated using a spray dryer, and then calcined at 1000°C or higher in air or a non-oxidizing atmosphere. This is a unique method for producing porous ceramics.
本発明では、セラミックス原料粉体に、有機バインダを
添加し、これに水を加えて混錬した後、スプレードライ
ヤにより造粒し、１０００℃以上で大気あるいは非酸化
雰囲気中で仮焼成する。この後、新たにバインダを加え
て成形して得られた成形体を焼成して多孔質セラミック
スとする。In the present invention, an organic binder is added to ceramic raw material powder, water is added thereto, the mixture is kneaded, and then granulated using a spray dryer and pre-fired at 1000° C. or higher in air or a non-oxidizing atmosphere. Thereafter, a new binder is added and the resulting molded body is fired to form a porous ceramic.
本発明におけるセラミックス原料粉体を予じめバインダ
を加えてスプレードライヤを用いて造粒し、その後、仮
焼成する作用を説明すると、仮焼成により造粒物に強度
をもたせておき、その後、成形のために添加するバイン
ダ及び水に溶解して解砕されないようにするためでちる
。To explain the effect of adding a binder to the ceramic raw material powder in advance and granulating it using a spray dryer in the present invention, and then pre-firing, the granules are given strength by the pre-firing, and then molded. A binder is added to prevent the material from dissolving in water and being crushed.
成形は、プレス、スリップ・キャスティング。Molding is done by pressing and slip casting.
押し出し加工等手段を選ばないが、成形により予じめ造
粒した造粒物が砕けないようにして、球状に近い造粒物
が接点間で接着されるようにする。Although any method such as extrusion processing is used, the granules pre-granulated by molding should be prevented from breaking, and the granules, which are nearly spherical, should be adhered between the contact points.
この後、セラミックス原料に応じた温度で焼成すれは造
粒物は球状に焼成され隣合った造粒物とは点で接着して
いるため、均一々通気性を有する多孔質セラミックスが
得られる。Thereafter, the granules are fired at a temperature depending on the ceramic raw material. Since the granules are fired into a spherical shape and adjacent granules are bonded at points, a porous ceramic having uniform air permeability is obtained.
以下本発明の具体的な方法について実施例をあげて詳細
に説明する。The specific method of the present invention will be described in detail below with reference to Examples.
実施例１
セラミックス゛原料として一次粒子径が平均ｃＬ５μ惰
のＡ／、Ｏ，粉末を１ｏＯｒ、造粒用の結合剤としてワ
ックス系バインダ（中京油脂（株）製ＷＤ−８５０）１
５ｆ、希釈剤として水を４５９の割合で配合してスラリ
ーとした。これを熱風温度１５０〜１８０℃、ディスク
回転数１００００−１２０００ ｒｐｍの条件でスプレ
ー・ドライヤにより造粒し、その後、大気中１０００’
Ｃで仮焼成したっ造粒後の粒子径は５０μ倶〜１００μ
倶のものが大半であシ、仮焼成したものは水に再溶解す
ることはない。Example 1 Ceramic raw materials were A/O with an average primary particle size of 5 μL, powder was used at 10 Or, and a wax binder (WD-850 manufactured by Chukyo Yushi Co., Ltd.) was used as a binder for granulation.
5f, water was added as a diluent at a ratio of 459 to form a slurry. This was granulated using a spray dryer at a hot air temperature of 150 to 180°C and a disc rotation speed of 10,000 to 12,000 rpm, and then granulated in the air for 1,000 minutes.
The particle size after granulation after pre-calcination with C is 50μ~100μ
Most of these are the same, and once calcined, they will not be redissolved in water.
この造粒物１００ｔに対し、成形用バインダとして新た
にアクリル樹脂（中央理化（株） ５Ａ−２０５）’Ｑ
３ｒ、水５５？の割合で添加し、これを所定の形状の金
型でプレス圧２００ ｋｌ？ｆ／６１？で湿式成形した
。この後、この成形体を乾燥後、１６００℃で焼成した
。For 100 tons of this granulated material, a new acrylic resin (Chuo Rika Co., Ltd. 5A-205)'Q was added as a molding binder.
3r, water 55? and press it into a mold with a predetermined shape at a pressure of 200 kl? f/61? It was wet molded. Thereafter, this molded body was dried and then fired at 1600°C.
第１図は焼成後の状態を模式的に示したものである。造
粒したＡ／、○、造粒物１は、径が４０−９０μｍ程度
である。それ自身は収縮率１０〜２０チ程度で焼結して
いる。但し、隣合った造粒物とは接点間で焼結が進むだ
けで、空間を有しており、均一な多孔質体となっている
、。FIG. 1 schematically shows the state after firing. The granulated A/, ○, granulated product 1 has a diameter of about 40-90 μm. The material itself is sintered with a shrinkage rate of about 10 to 20 inches. However, the sintering between adjacent granules only progresses between the points of contact, and there are spaces between them, resulting in a uniform porous body.
実施例２
セラミックス原料として一次粒子径が平均１μｍのＹ、
０．やＡｌ２Ｏ３等の焼成助剤を添加したＳ ｉ３Ｎ、
粉末’）１００９、造粒用の結合剤としてワックス系バ
インダ（中京油脂（株）製ＷＤ−８５０）１５？、希釈
剤として水を７０９の割合で配合してスラリーとした。Example 2 Y with an average primary particle size of 1 μm as a ceramic raw material,
0. Si3N with added firing aids such as and Al2O3,
Powder') 1009, wax-based binder (WD-850 manufactured by Chukyo Yushi Co., Ltd.) 15? as a binder for granulation. A slurry was prepared by adding water as a diluent at a ratio of 709.
これを熱風温度１５０〜１８０℃ディスク回転数１００
００〜１２ｏｏ。This is heated with a hot air temperature of 150 to 180℃ and a disk rotation speed of 100.
00-12oo.
ｒｐｍの条件でスプレードライヤにより造粒し、その後
非酸化雰囲気中で仮焼成した。The pellets were granulated using a spray dryer under the conditions of rpm, and then pre-calcined in a non-oxidizing atmosphere.
この造粒物１００２に対し、成形用バインダとして新た
にワックス系バインダを１５２、水５０？の割合で添加
し、プレス圧５０′Ｋｇｆ／ｃｒＩ？で湿式成形した。To this granulated material 1002, 152% of wax-based binder was added as a molding binder and 50% of water was added. and press pressure 50'Kgf/crI? It was wet molded.
この後、窒素圧Ａ Ｋ９ｆ／１Ｍ？の加圧雰囲気中で、
１７５０℃、２ｈｒの条件で焼成した。焼成後は実施例
１と同様多孔質のセラミックスが得られた。After this, nitrogen pressure A K9f/1M? In a pressurized atmosphere of
It was fired at 1750°C for 2 hours. After firing, porous ceramics similar to Example 1 were obtained.
以上、本発明に関する実施例２種ｔあげた。Above, two types of examples related to the present invention have been given.
これら実施例では、作業性や環境面から希釈剤として水
を使用した場合について説明したが、有機溶剤を希釈剤
として使用して造粒する方法も可能である。In these Examples, the case where water was used as a diluent was explained from the viewpoint of workability and environment, but a method of granulation using an organic solvent as a diluent is also possible.
また、成形は湿式プレス成形を例に説明したが、同じ配
合で、押出し成形も可能でちり、更に水を増せば、スリ
ップ・キャスティングも可能である。In addition, although wet press molding has been described as an example of molding, extrusion molding is also possible with the same composition, and if dust and water are added, slip casting is also possible.
本発明は、以上詳記したように、セラミック原料粉体の
造粒工程において、造粒によシ得られる顆粒を特定条件
下で仮焼成するものであるから、その後の工程である成
形工程において添加するバインダおよび水によって、セ
ラミック原料の造粒物が解砕されることがなく、その結
果、球状に近い造粒物が接点間で、すなわち、点で接着
し、均一な通気性を有する多孔質セラミックスが得られ
る効果が生ずる。また、本発明の方法で得られるものは
、セラミックスを原料とする多孔質フィルタであるため
、耐食及び耐酸化性に優れており、従来の金属あるいは
プラスチックスフィルタでは考えられない高温雰囲気下
での使用が可能となる。また、本発明において溶剤とし
て、水をベースとするのが好ましく、この場合有機溶剤
を使用する場合と比較して安全に作業できる利点がある
。As described in detail above, in the granulation process of ceramic raw material powder, the present invention is to pre-fire the granules obtained by granulation under specific conditions. The added binder and water prevent the ceramic raw material granules from being crushed, and as a result, the nearly spherical granules adhere between the contact points, that is, at the points, and form porous particles with uniform air permeability. This results in the effect that high-quality ceramics can be obtained. Furthermore, since the filter obtained by the method of the present invention is a porous filter made from ceramics, it has excellent corrosion resistance and oxidation resistance, and can be used in high-temperature atmospheres, which is unimaginable for conventional metal or plastic filters. It becomes possible to use it. Further, in the present invention, it is preferable to use water as the solvent as a base, and in this case, there is an advantage that the work can be carried out safely compared to the case where an organic solvent is used.
第１図は、本発明の方法によって得られた焼成後の多孔
質セラミックスを模式的に示した図である。
復代理人 内 １） 明
復代理人 萩 原 亮 −
復代理人 安 西 篤 夫FIG. 1 is a diagram schematically showing porous ceramics after firing obtained by the method of the present invention. Sub-Agents 1) Meifuku Agent Ryo Hagiwara − Sub-Agent Atsuo Anzai
Claims (1)
添加し、成形して得られた成形体を焼成して焼結体とす
る多孔質セラミックスの製造方法において、前記セラミ
ックス顆粒として、セラミックス原料粉体に有機バイン
ダと水を添加して混練した後、これをスプレードライヤ
により造粒し、この後１０００℃以上で大気あるいは非
酸化雰囲気中で仮焼成したものを用いることを特徴とす
る多孔質セラミックスの製造法。In a method for producing porous ceramics, in which a binder is newly added to granules obtained by granulating ceramic powder, and the resulting compact is fired to obtain a sintered body, the ceramic granules are made of ceramic raw material powder. After adding an organic binder and water to and kneading, the resulting material is granulated using a spray dryer, and then pre-sintered at 1000°C or higher in the air or in a non-oxidizing atmosphere. Manufacturing method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12006486A JPS62278175A (en) | 1986-05-27 | 1986-05-27 | Manufacture of porous ceramics |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12006486A JPS62278175A (en) | 1986-05-27 | 1986-05-27 | Manufacture of porous ceramics |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62278175A true JPS62278175A (en) | 1987-12-03 |
Family
ID=14776992
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12006486A Pending JPS62278175A (en) | 1986-05-27 | 1986-05-27 | Manufacture of porous ceramics |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62278175A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01230486A (en) * | 1988-03-10 | 1989-09-13 | Ngk Spark Plug Co Ltd | Production of porous ceramics |
| JPH0264076A (en) * | 1988-08-30 | 1990-03-05 | Ngk Spark Plug Co Ltd | Production of porous ceramics |
| JPH0292878A (en) * | 1988-09-27 | 1990-04-03 | Ngk Insulators Ltd | Ceramic porous board, water permeable pavement board and acoustical board |
| JP2006089345A (en) * | 2004-09-27 | 2006-04-06 | Kyocera Corp | Conductive porous ceramic sintered compact and method for producing the same |
| JP2007290875A (en) * | 2006-04-20 | 2007-11-08 | Sumitomo Metal Mining Co Ltd | Titanium oxide-based sintered compact and its manufacturing method |
-
1986
- 1986-05-27 JP JP12006486A patent/JPS62278175A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01230486A (en) * | 1988-03-10 | 1989-09-13 | Ngk Spark Plug Co Ltd | Production of porous ceramics |
| JPH0264076A (en) * | 1988-08-30 | 1990-03-05 | Ngk Spark Plug Co Ltd | Production of porous ceramics |
| JPH0292878A (en) * | 1988-09-27 | 1990-04-03 | Ngk Insulators Ltd | Ceramic porous board, water permeable pavement board and acoustical board |
| JP2006089345A (en) * | 2004-09-27 | 2006-04-06 | Kyocera Corp | Conductive porous ceramic sintered compact and method for producing the same |
| JP2007290875A (en) * | 2006-04-20 | 2007-11-08 | Sumitomo Metal Mining Co Ltd | Titanium oxide-based sintered compact and its manufacturing method |
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