JPH0710654A - Porous ceramic form and its production - Google Patents
Porous ceramic form and its productionInfo
- Publication number
- JPH0710654A JPH0710654A JP17747593A JP17747593A JPH0710654A JP H0710654 A JPH0710654 A JP H0710654A JP 17747593 A JP17747593 A JP 17747593A JP 17747593 A JP17747593 A JP 17747593A JP H0710654 A JPH0710654 A JP H0710654A
- Authority
- JP
- Japan
- Prior art keywords
- porous ceramic
- porous
- ceramic body
- calcium hydroxide
- slurry
- 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 abstract description 44
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 14
- 239000011148 porous material Substances 0.000 claims abstract description 26
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 20
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims abstract description 16
- 239000000920 calcium hydroxide Substances 0.000 claims abstract description 16
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims abstract description 16
- 229910052574 oxide ceramic Inorganic materials 0.000 claims abstract description 15
- 239000002002 slurry Substances 0.000 claims abstract description 11
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910001868 water Inorganic materials 0.000 claims abstract description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 18
- 239000011224 oxide ceramic Substances 0.000 claims description 14
- 239000002994 raw material Substances 0.000 claims description 14
- 239000000843 powder Substances 0.000 claims description 5
- 239000006260 foam Substances 0.000 abstract description 9
- 229910010293 ceramic material Inorganic materials 0.000 abstract description 2
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 12
- 238000000034 method Methods 0.000 description 8
- 238000005187 foaming Methods 0.000 description 7
- 238000000465 moulding Methods 0.000 description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- 239000002245 particle Substances 0.000 description 6
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 5
- 239000003795 chemical substances by application Substances 0.000 description 4
- 238000007796 conventional method Methods 0.000 description 4
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 description 4
- 238000010304 firing Methods 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 230000005484 gravity Effects 0.000 description 4
- 229910052863 mullite Inorganic materials 0.000 description 4
- 239000004094 surface-active agent Substances 0.000 description 4
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 3
- 229940024548 aluminum oxide Drugs 0.000 description 3
- 229910052878 cordierite Inorganic materials 0.000 description 3
- JSKIRARMQDRGJZ-UHFFFAOYSA-N dimagnesium dioxido-bis[(1-oxido-3-oxo-2,4,6,8,9-pentaoxa-1,3-disila-5,7-dialuminabicyclo[3.3.1]nonan-7-yl)oxy]silane Chemical compound [Mg++].[Mg++].[O-][Si]([O-])(O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2)O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2 JSKIRARMQDRGJZ-UHFFFAOYSA-N 0.000 description 3
- 239000003814 drug Substances 0.000 description 3
- 229940079593 drug Drugs 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000004088 foaming agent Substances 0.000 description 3
- 239000003205 fragrance Substances 0.000 description 3
- 239000000377 silicon dioxide Substances 0.000 description 3
- 229910052708 sodium Inorganic materials 0.000 description 3
- 239000011734 sodium Substances 0.000 description 3
- 239000000969 carrier Substances 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 239000004927 clay Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 235000014113 dietary fatty acids Nutrition 0.000 description 2
- 239000000194 fatty acid Substances 0.000 description 2
- 229930195729 fatty acid Natural products 0.000 description 2
- 150000004665 fatty acids Chemical class 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 229910052573 porcelain Inorganic materials 0.000 description 2
- 239000011819 refractory material Substances 0.000 description 2
- -1 sheaths and setters Substances 0.000 description 2
- 239000000344 soap Substances 0.000 description 2
- 239000004604 Blowing Agent Substances 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- 229930182764 Polyoxin Natural products 0.000 description 1
- 229920006328 Styrofoam Polymers 0.000 description 1
- 125000003282 alkyl amino group Chemical group 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000004794 expanded polystyrene Substances 0.000 description 1
- 239000010433 feldspar Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- GSGDTSDELPUTKU-UHFFFAOYSA-N nonoxybenzene Chemical compound CCCCCCCCCOC1=CC=CC=C1 GSGDTSDELPUTKU-UHFFFAOYSA-N 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- YEBIHIICWDDQOL-YBHNRIQQSA-N polyoxin Polymers O[C@@H]1[C@H](O)[C@@H](C(C=O)N)O[C@H]1N1C(=O)NC(=O)C(C(O)=O)=C1 YEBIHIICWDDQOL-YBHNRIQQSA-N 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 239000008261 styrofoam Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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
- C04B38/02—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by adding chemical blowing agents
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Compositions Of Oxide Ceramics (AREA)
- Porous Artificial Stone Or Porous Ceramic Products (AREA)
- Filtering Materials (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は，サヤ，セッター等の耐
火物，軽量食器用素材や各種フィルター，触媒担体等と
して用いられる多孔質セラミック体及びその製造方法に
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refractory material such as a sheath and a setter, a material for lightweight tableware, various filters, a porous ceramic body used as a catalyst carrier, and a method for producing the same.
【０００２】[0002]
【従来技術】多孔質セラミック製品は，サヤ，セッター
等の耐火物，軽量食器用素材等として多くの用途があ
る。この多孔質セラミック体の製造方法としては，従
来，酸化物セラミック原料に発泡スチロール，おがくず
等の有機物を混合して，これらを焼成し，セラミック焼
結体に細孔を形成したものがある。また，酸化物セラミ
ック原料に，金属粉末，水酸化ナトリウム等の発泡剤を
混合，発泡させて発泡体となし，その後これらを焼成し
て，多孔質セラミック体を製造する方法も提案されてい
る。2. Description of the Related Art Porous ceramic products have many uses as refractory materials such as sheaths and setters, and materials for lightweight tableware. As a method of manufacturing this porous ceramic body, conventionally, there is a method in which an oxide ceramic raw material is mixed with an organic substance such as styrofoam or sawdust and the mixture is fired to form pores in the ceramic sintered body. There is also proposed a method of producing a porous ceramic body by mixing an oxide ceramic raw material with a foaming agent such as metal powder or sodium hydroxide to form a foam, which is then fired.
【０００３】[0003]
【解決しようとする課題】しかしながら，水酸化ナトリ
ウムは劇薬であるため，作業の安全性に問題がある。ま
た，多孔質セラミック体中には，ナトリウムが残存する
ため，多孔質セラミック体の耐熱温度が低下し，これを
１２００℃以上の高温下で使用する場合には，軟化変形
するおそれがある。[Problems to be solved] However, since sodium hydroxide is a powerful drug, there is a problem in work safety. Further, since sodium remains in the porous ceramic body, the heat resistant temperature of the porous ceramic body is lowered, and when it is used at a high temperature of 1200 ° C. or higher, it may be softened and deformed.
【０００４】また，発泡スチロール，おがくず等の有機
物を使用する場合には，細孔径が１００μｍ以下の多孔
質セラミック体を作製することが困難であり，細孔径の
選択が限定される。また，焼成時に悪臭，煙，煤の発生
があり，公害のおそれがある。そこで，本発明はかかる
従来の問題点に鑑み，製造上の安全性が確保でき，耐熱
性に優れ，細孔径の選択性に富んだ多孔質セラミック体
及びその製造方法を提供しようとするものである。Further, when organic materials such as expanded polystyrene and sawdust are used, it is difficult to produce a porous ceramic body having a pore size of 100 μm or less, and the selection of the pore size is limited. In addition, bad smell, smoke and soot are generated during firing, which may cause pollution. Therefore, in view of the above conventional problems, the present invention intends to provide a porous ceramic body which can secure manufacturing safety, is excellent in heat resistance, and is highly selective in pore diameter, and a manufacturing method thereof. is there.
【０００５】[0005]
【課題の解決手段】本発明は，多数の細孔を有する多孔
質セラミック体であって，上記細孔は，水酸化カルシウ
ム及び粉末アルミニウムを酸化物セラミック原料中にお
いて反応させて水素ガスを発生させることにより形成さ
れたものであることを特徴とする多孔質セラミック体に
ある。The present invention relates to a porous ceramic body having a large number of pores, wherein the pores react with calcium hydroxide and powdered aluminum in an oxide ceramic raw material to generate hydrogen gas. The porous ceramic body is characterized by being formed by the above.
【０００６】本発明において最も注目すべきことは，発
泡剤として粉末アルミニウム及び水酸化カルシウムを用
いていることである。上記水酸化カルシウムは，酸化物
セラミック原料１００重量部（以下，部という。）に対
して，０．１〜１０部添加されることが好ましい。０．
１部未満の場合には，発泡しないか，または発泡率が小
さくなるおそれがある。一方，１０部を越える場合に
は，強度が弱くなるかまたは耐熱温度が低下するおそれ
がある。Most notable in the present invention is the use of powdered aluminum and calcium hydroxide as blowing agents. The calcium hydroxide is preferably added in an amount of 0.1 to 10 parts with respect to 100 parts by weight (hereinafter referred to as "parts") of the oxide ceramic raw material. 0.
If it is less than 1 part, the foaming may not occur or the foaming rate may decrease. On the other hand, if it exceeds 10 parts, the strength may be weakened or the heat resistant temperature may be lowered.
【０００７】上記粉末アルミニウムは，その粒径を変え
ることにより，多孔質セラミック体の細孔径を調整する
ことができる。即ち，粒径が大きい場合には，細孔径が
大きくなる。粒径が小さい場合には，細孔径が小さくな
る。上記粉末アルミニウムは，水酸化カルシウム１部に
対して，０．１〜１０部添加されることが好ましい。
０．１部未満の場合には，発泡しないかまたは発泡率が
小さくなるおそれがある。一方，１０部を越える場合に
は，強度が弱くなるか，または耐熱温度が低下するおそ
れがある。上記酸化物セラミック原料としては，アルミ
ナ，シリカ，ムライト，コーディエライト等を用いる。
酸化物セラミック原料の純度は，セラミックの特性を満
足することができるものであれば，特に問題はない。By changing the particle size of the powdered aluminum, the pore size of the porous ceramic body can be adjusted. That is, when the particle size is large, the pore size is large. When the particle size is small, the pore size is small. It is preferable that 0.1 to 10 parts of the powdered aluminum is added to 1 part of calcium hydroxide.
If it is less than 0.1 part, the foaming may not occur or the foaming rate may decrease. On the other hand, if it exceeds 10 parts, the strength may be weakened or the heat resistant temperature may be lowered. As the oxide ceramic raw material, alumina, silica, mullite, cordierite, or the like is used.
There is no particular problem with the purity of the oxide ceramic raw material as long as the ceramic characteristics can be satisfied.
【０００８】次に，上記多孔質セラミック体を製造する
方法としては，例えば酸化物セラミック原料と水酸化カ
ルシウムと水とからなるスラリーに粉末アルミニウムを
混合し，次いでこれらを発泡させて多孔質発泡体とな
し，その後焼成することを特徴とする多孔質セラミック
体の製造方法がある。上記スラリーには，界面活性剤を
添加することが好ましい。これにより，多孔質発泡体の
細孔径を小さくすることができる。上記界面活性剤とし
ては，脂肪酸せっけん，アルキルベンゼンスルホン酸
塩，長鎖アルキルアミノ酸，ポリオキシンエチレンノニ
ルフェニルエーテル等がある。Next, as a method for producing the above-mentioned porous ceramic body, for example, powder aluminum is mixed with a slurry composed of an oxide ceramic raw material, calcium hydroxide and water, and then these are foamed to form a porous foam body. However, there is a method for producing a porous ceramic body, which is characterized by firing after that. It is preferable to add a surfactant to the slurry. As a result, the pore size of the porous foam can be reduced. Examples of the surfactant include fatty acid soap, alkylbenzene sulfonate, long-chain alkyl amino acid, polyoxin ethylene nonyl phenyl ether and the like.
【０００９】また，上記多孔質発泡体を製造する際に
は，容器状，板状，棒状等の所望の形状に成形すること
が好ましい。成形の方法としては，上記スラリーと粉末
アルミニウムとを混合した後，これを成形型に入れて発
泡させる方法がある。この場合，通常の成形法，振動，
高圧，減圧下での鋳込み成形法等を用いる。Further, when the porous foam is manufactured, it is preferable to mold it into a desired shape such as a container shape, a plate shape, or a rod shape. As a molding method, there is a method in which the above slurry and powdered aluminum are mixed and then this is put into a molding die and foamed. In this case, the normal molding method, vibration,
The cast molding method under high pressure and reduced pressure is used.
【００１０】また，成形型内へのスラリーの投入は，実
施例に示すごとく，ガスが発生して，発泡状態を呈し始
めた後が良い。これにより，ほぼ均一な空隙を有する多
孔質セラミック体を得ることができる。また，鋳込み成
形型からの成形品の離型を容易にするためには，成形型
の表面に離型剤を塗布しておくことが好ましい。これに
より，離型を容易に行うことができる。また，離型剤
は，焼成後に好ましい表面コートを形成する場合があ
る。上記離型剤としては，アルミナ，ムライト等のセラ
ミック粉体を用いることができる。Further, as shown in the embodiment, the slurry may be charged into the molding die after the gas is generated and the foaming state is started. This makes it possible to obtain a porous ceramic body having substantially uniform voids. Further, in order to facilitate the release of the molded product from the casting mold, it is preferable to apply a release agent on the surface of the mold. Thereby, the mold release can be easily performed. Also, the release agent may form a preferred surface coat after firing. As the release agent, ceramic powder such as alumina or mullite can be used.
【００１１】[0011]
【作用及び効果】本発明においては，発泡剤として水酸
化カルシウムと粉末アルミニウムとを用いている。水酸
化カルシウムは，アルミニウムと接触すると，アルミに
よる酸化反応を生じ，これによって水素ガスを発生させ
る。そのため，このガスにより，酸化物セラミック原料
の成形体内に細孔が形成された多孔質発泡体ができる。
従って，この細孔を有する多孔質発泡体を焼成すれば，
多孔質セラミック体を得ることができる。FUNCTION AND EFFECT In the present invention, calcium hydroxide and powdered aluminum are used as the foaming agent. When calcium hydroxide comes into contact with aluminum, it causes an oxidation reaction by aluminum, thereby generating hydrogen gas. Therefore, this gas produces a porous foamed body in which pores are formed in the molded body of the oxide ceramic raw material.
Therefore, if the porous foam with these pores is fired,
A porous ceramic body can be obtained.
【００１２】また，粉末アルミニウムの粒径を変えるこ
とにより，様々な細孔径を選択することができる。その
ため，本発明の多孔質セラミック体は，多目的のセラミ
ック素材として用いることができる。例えば，細孔径が
小さい多孔質セラミック体は，フィルター，各種セラミ
ックス担体，センサー等の用途がある。細孔径が大きい
多孔質セラミック体は，サヤ，セッター，軽量食器等の
用途がある。また，多孔質セラミック体は，細孔内に芳
香剤を含浸して，含浸芳香剤として用いることもでき
る。Also, various pore sizes can be selected by changing the particle size of the powdered aluminum. Therefore, the porous ceramic body of the present invention can be used as a multipurpose ceramic material. For example, a porous ceramic body having a small pore size has applications such as filters, various ceramic carriers, and sensors. The porous ceramic body with a large pore size has applications such as sheathing, setters, and lightweight tableware. The porous ceramic body can also be used as an impregnated fragrance by impregnating the pores with the fragrance.
【００１３】また，多孔質セラミック体は，前記従来法
のごとく，発泡時に用いたナトリウムを含有していない
ので，１３００℃の高温下でも変形することがなく，耐
熱性に優れている。さらに，従来法のごとく劇薬物の水
酸化ナトリウムを用いることなく，多孔質セラミック体
を作成することができるので，製造時における作業の安
全性を確保することができる。従って，本発明によれ
ば，製造上の安全性が確保でき，耐熱性に優れ，細孔径
の選択性に富んだ多孔質セラミック体及びその製造方法
を提供することができる。Also, since the porous ceramic body does not contain sodium used in foaming as in the conventional method, it does not deform even at a high temperature of 1300 ° C. and is excellent in heat resistance. Furthermore, since the porous ceramic body can be prepared without using the powerful drug sodium hydroxide as in the conventional method, it is possible to ensure the safety of the work during the production. Therefore, according to the present invention, it is possible to provide a porous ceramic body which can secure manufacturing safety, is excellent in heat resistance, and has a wide range of pore size selectivity, and a method for manufacturing the same.
【００１４】[0014]
【実施例】実施例１ 本発明にかかる多孔質セラミック体の製造方法について
説明する。まず，アルミナ２５重量％，ケイ石２５重量
％，長石３５重量％，及び粘土１５重量％よりなるアル
ミナ・シリカ系の酸化物セラミック原料１００部に，水
酸化カルシウム０．８部，水１００部，及び解こう剤
０．３部を加えて，磁製ポット及び磁製玉石により１６
時間混合，粉砕し，スラリーを作製した。次いで，この
スラリー１００部に，粒径１０〜１００μｍの粉末アル
ミニウム０．４部及び界面活性剤０．１部を添加し，こ
れらを攪拌した。界面活性剤としては，脂肪酸せっけん
を用いた。Example 1 A method for manufacturing a porous ceramic body according to the present invention will be described. First, 100 parts of an alumina / silica-based oxide ceramic raw material consisting of 25% by weight of alumina, 25% by weight of silica stone, 35% by weight of feldspar, and 15% by weight of clay, 0.8 part of calcium hydroxide, 100 parts of water, And 0.3 parts of deflocculant were added, and the porcelain pot and porcelain cobblestones
Slurry was prepared by time-mixing and crushing. Next, to 100 parts of this slurry, 0.4 parts of powdered aluminum having a particle size of 10 to 100 μm and 0.1 part of a surfactant were added and stirred. Fatty acid soap was used as the surfactant.
【００１５】次に，約２０〜２５分間放置すると，ガス
が発生し上記スラリーが発泡し始める。このとき，成形
型内に，上記の発泡し始めたスラリーを流し込み，乾燥
機により５０℃，１２時間乾燥させた。なお，成形型内
には，予め離型剤としての粒径１〜１０μｍのアルミナ
粉末を吹きつけておいた。その後，乾燥した成形体を成
形型内から取り出し，１２５０℃，２時間焼成し，多孔
質セラミック体を得た。Next, when left for about 20 to 25 minutes, gas is generated and the slurry begins to foam. At this time, the above-mentioned foaming-started slurry was poured into the mold and dried at 50 ° C. for 12 hours by a dryer. In addition, alumina powder having a particle size of 1 to 10 μm was previously sprayed as a release agent into the molding die. Then, the dried molded body was taken out from the molding die and fired at 1250 ° C. for 2 hours to obtain a porous ceramic body.
【００１６】得られた多孔質セラミック体は，表面が平
滑であり，気孔率４３．５％，かさ比重１．４４ｇ／ｃ
ｍ3 ，細孔径１０〜２００μｍであった。また，ほぼ均
一に分散された空隙を有していた。尚，粉末アルミニウ
ム及び水酸化カルシウムを添加しないで他は上記と同様
にして作製した比較セラミック体は，気孔率０．１％，
かさ比重２．６０ｇ／ｃｍ3 ，細孔径０μｍであった。The obtained porous ceramic body had a smooth surface, a porosity of 43.5% and a bulk specific gravity of 1.44 g / c.
m 3 , and the pore size was 10 to 200 μm. It also had voids that were almost uniformly dispersed. The comparative ceramic body prepared in the same manner as above except that powdered aluminum and calcium hydroxide were not added, had a porosity of 0.1%,
The bulk specific gravity was 2.60 g / cm 3 and the pore size was 0 μm.
【００１７】次に，本例の作用効果について説明する。
本例においては，発泡剤として水酸化カルシウムと粉末
アルミニウムとを用いている。水酸化カルシウムは，ア
ルミニウムと接触すると，アルミの酸化反応を生じ，こ
れによって水素ガスを発生させる。そのため，このガス
により，酸化物セラミック原料の成形体内に細孔が形成
された多孔質発泡体ができる。従って，この細孔を有す
る多孔質発泡体を焼成すれば，多孔質セラミック体を得
ることができる。Next, the function and effect of this example will be described.
In this example, calcium hydroxide and powdered aluminum are used as the foaming agent. When calcium hydroxide comes into contact with aluminum, it causes an oxidation reaction of aluminum, thereby generating hydrogen gas. Therefore, this gas produces a porous foamed body in which pores are formed in the molded body of the oxide ceramic raw material. Therefore, a porous ceramic body can be obtained by firing the porous foam having the pores.
【００１８】また，作成された多孔質セラミック体は，
前記従来法のごとく発泡時に用いたナトリウムを含有し
ていないので，１３００℃の高温下でも変形することが
なく，耐熱性に優れている。また，従来法のごとく，劇
薬物の水酸化ナトリウムを用いることなく，多孔質セラ
ミック体を作成することができるので，製造時における
作業の安全性を確保することができる。本例の多孔質セ
ラミック体は，サヤ，セッター，軽量食器，フィルタ
ー，各種触媒担体，含浸芳香剤の用途がある。The produced porous ceramic body is
Since it does not contain sodium used during foaming as in the conventional method, it does not deform even at a high temperature of 1300 ° C. and has excellent heat resistance. Further, as in the conventional method, the porous ceramic body can be prepared without using the powerful drug sodium hydroxide, so that the safety of the work at the time of manufacturing can be secured. The porous ceramic body of this example has applications in sheaths, setters, lightweight tableware, filters, various catalyst carriers, and impregnated fragrances.
【００１９】実施例２ 本例の多孔質セラミック体は，ムライト・コーディエラ
イト系の酸化物セラミック原料を用いている。上記酸化
物セラミック原料は，ムライト４０重量％，コーディエ
ライト４０重量％，及び粘土２０重量％よりなる。この
ものを用いて，他は実施例１と同様にして多孔質セラミ
ック体を製造した。Example 2 The porous ceramic body of this example uses a mullite cordierite oxide ceramic raw material. The oxide ceramic raw material comprises 40% by weight of mullite, 40% by weight of cordierite, and 20% by weight of clay. Using this product, a porous ceramic body was manufactured in the same manner as in Example 1 except for the above.
【００２０】これにより得られた多孔質セラミック体
は，気孔率７６．３％，かさ比重０．６６ｇ／ｃｍ3 ，
細孔径１０〜３００μｍであった。また，ほぼ均一に分
散された空隙を有していた。その他は，実施例１と同様
である。本例においても，実施例１と同様の効果を得る
ことができる。尚，粉末アルミニウム及び水酸化カルシ
ウムを添加しないで他は上記と同様にして作製した比較
セラミック体は，気孔率４４．２％，かさ比重１．５５
ｇ／ｃｍ3 ，細孔径１０μｍであった。The porous ceramic body thus obtained has a porosity of 76.3%, a bulk specific gravity of 0.66 g / cm 3 ,
The pore size was 10 to 300 μm. It also had voids that were almost uniformly dispersed. Others are the same as in the first embodiment. Also in this example, the same effect as that of the first embodiment can be obtained. The comparative ceramic body prepared in the same manner as above except that powdered aluminum and calcium hydroxide were not added had a porosity of 44.2% and a bulk specific gravity of 1.55.
It was g / cm 3 and the pore diameter was 10 μm.
Claims (2)
であって，上記細孔は，水酸化カルシウム及び粉末アル
ミニウムを酸化物セラミック原料中において反応させて
水素ガスを発生させることにより形成されたものである
ことを特徴とする多孔質セラミック体。1. A porous ceramic body having a large number of pores, wherein the pores are formed by reacting calcium hydroxide and powdered aluminum in an oxide ceramic raw material to generate hydrogen gas. A porous ceramic body characterized by being a thing.
ムと水とからなるスラリーに粉末アルミニウムを混合
し，次いでこれらを発泡させて多孔質発泡体となし，そ
の後焼成することを特徴とする多孔質セラミック体の製
造方法。2. A porous ceramic, characterized in that a powder aluminum is mixed with a slurry composed of an oxide ceramic raw material, calcium hydroxide and water, and these are then foamed to form a porous foamed body, and then fired. Body manufacturing method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17747593A JPH0710654A (en) | 1993-06-23 | 1993-06-23 | Porous ceramic form and its production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17747593A JPH0710654A (en) | 1993-06-23 | 1993-06-23 | Porous ceramic form and its production |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0710654A true JPH0710654A (en) | 1995-01-13 |
Family
ID=16031569
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17747593A Pending JPH0710654A (en) | 1993-06-23 | 1993-06-23 | Porous ceramic form and its production |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0710654A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998023370A1 (en) * | 1996-11-25 | 1998-06-04 | Armstrong Medical Limited | Carbon dioxide absorbent in anaesthesiology |
| KR101537071B1 (en) * | 2013-04-22 | 2015-07-16 | 에스코 주식회사 | Manufacturing method of scent ceramics |
-
1993
- 1993-06-23 JP JP17747593A patent/JPH0710654A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998023370A1 (en) * | 1996-11-25 | 1998-06-04 | Armstrong Medical Limited | Carbon dioxide absorbent in anaesthesiology |
| KR101537071B1 (en) * | 2013-04-22 | 2015-07-16 | 에스코 주식회사 | Manufacturing method of scent ceramics |
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