JP3930963B2 - Method for firing long ceramic tube molded body - Google Patents

Method for firing long ceramic tube molded body Download PDF

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Publication number
JP3930963B2
JP3930963B2 JP07488498A JP7488498A JP3930963B2 JP 3930963 B2 JP3930963 B2 JP 3930963B2 JP 07488498 A JP07488498 A JP 07488498A JP 7488498 A JP7488498 A JP 7488498A JP 3930963 B2 JP3930963 B2 JP 3930963B2
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Prior art keywords
tube
hole
fixing block
firing
molded body
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JP07488498A
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JPH11255565A (en
Inventor
一彦 川口
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Mitsui Mining and Smelting Co Ltd
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Mitsui Mining and Smelting Co Ltd
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Description

【０００１】
【産業上の利用分野】
本発明は、長尺セラミックスチューブ成形体の焼成方法に関するものである。
【０００２】
【従来技術】
従来、公知の、特開平３−２１８９８２号公報には、長尺セラミックスチューブ成形体ｃを焼成するにあたり、焼成時の曲がりの少ない製品を得るために、該チューブｃの上端部に孔を穿け、該孔にセラミックス質の支持ピンｅを挿通して窯ｄ内の支持具ａの支持孔ｂより吊設し、高温度で焼成する長尺セラミックスチューブ成形体の焼成方法について記載されている。
また、特開平６−３２１６４４号公報には、セラミックスチューブの生製品ｃの上端に横孔ｆを穿け、前記チューブ生製品ｃの上端を治具用型内に装着して、膨張割合がチューブ素材よりは小さいアルミナ・ムライト質又はムライト質の固定ブロック素材を流入させて固定ブロックｇ付きのチューブ成形体とし、固定ブロックｇの一部は横孔ｆ内に侵入して係合ピンｈとなり、これを窯ｄ内の支持具ａに吊設して焼成する長尺セラミックスチューブ成形体の焼成方法について記載されている。なお、ｉは可燃性の栓である。
【０００３】
【発明が解決しようとする課題】
前記公報のうち、前者のものは、１６００℃以上の焼成温度で焼成すると、ムライト質の支持ピンｅが折損することがあり、高温度の焼成では、強度不十分である。支持ピンｅの径を大きくして強度をもたせようとすると、チューブ本体ｃの孔径が大きくなり、チューブ本体ｃが焼結強度を持つ前に、約６００〜１０００℃付近で自重のために折損を起こしてしまう。また、SiC 質の支持ピンｃにすると、SiC が酸化して生成するSiO2のグレーズ(Glaze) が孔のまわりに拡散して、チューブ本体ｃの強度を低下させる。
前記後者の公報記載のものも、焼成温度が１６００℃に達すると、アルミナ・ムライト質又はムライト質の固定ブロック素材とチューブ生製品との係合部分ｈが折損して外れ、チューブｃは落下して折損することがあった。しかし、支持パイプｅによる吊設よりも、固定ブロックｇとチューブｃとの係合による吊設構造の方が利点が多いので、本願はこれを更に改善したものである。
【０００４】
【課題を解決するための手段】
よって、本発明は、チューブ素材を押出成形機により押出してチューブ状の成形体とし、該チューブの上端に貫通横孔を穿け、該チューブの上端の前記貫通横孔の稍下方に可燃性の栓を挿着し、前記チューブの上端の前記貫通横孔の部分はその外側に隙間ができるように鋳込用の石膏型で包囲し、固定用ブロックの素地を石膏型の注入口より流し込んで前記貫通横孔の部分は内外ともブロックである固定用ブロックを形成し、該固定用ブロックを窯内部の吊設台上に載置し前記チューブは垂直になるように吊設して焼成する長尺セラミックスチューブ成形体の焼成方法としたものである。
【０００５】
【実施例】
本発明の実施例を図面により説明すると、アルミナムライトを主成分とした素材を押出成形機により押出してチューブ１の生製品に成形し、乾燥させて水分を除き、前記チューブ１の上端２に貫通横孔３を穿け、チューブ１の上端２に発泡材のような可燃性の栓４を挿入して押込み、該栓４は貫通横孔３の稍下方位置となるようにし、前記チューブ１の上端２の外周を鋳込用の石膏型５で包囲し、前記チューブ１の下端６をバイブレータ７上に載置し、全体に振動を与えながら別途準備した固定用ブロックの素地を注入口８より流し込む。
【０００６】
このとき、前記石膏型５は、前記チューブ１の上端２の前記貫通横孔３の外側にも隙間９ができるように形成して前記貫通横孔３の内外に隙間ができるようにし、前記石膏型５に流入した固定用ブロック１１の素地が固化したのを確認後、石膏型５を取り除き、再び乾燥する。すると、前記固定用ブロック１１は前記貫通横孔３の内外に連通して形成される。
【０００７】
次に、図６のように窯１０内に移送し、前記石膏型５内で固化した前記固定用ブロック１１を窯内部の吊設台１２に引掛けてチューブ１が垂直になるように吊設する。この状態で１６００℃以上の高温で焼成して、全体を焼結させる。
【０００８】
このように焼結させると、セラミックスのチューブ１及び固定用ブロック１１は共に焼結の際の収縮で焼きじまりが出来、セラミックスチューブ１は約５〜７％収縮し、固定用ブロック１１は約３％収縮する。そのためには、固定用ブロック１１の素地は、チューブ１の素地と同じアルミナムライトを主成分としていても、アルミナ骨材の粒度を粗くしたものを用いるとよい。このことにより、固定ブロック１１とチューブ１の密着度が増し、また、貫通横孔３の内外に固定ブロック１１を設けた構成により落下防止の効果を発揮するものである。
【０００９】
なお、固定用ブロック１１の素地と、チューブ１の素地の一例を、表にしたものを図７に示す。
【００１０】
【作用】
本発明は、前記図６に示したチューブ素材を押出成形機により押出して図３のようなチューブ１の生製品を成形し、所望の長さに切断後、水分を乾燥させ、ついでチューブ１の上端２に貫通横孔３を穿け、該チューブ１の上端２の前記貫通横孔３の稍下方に樹脂発泡体のような可燃性の栓４を挿入して深さを調整する。ついで、図５のように、前記チューブ１の上端２の前記貫通横孔３の部分はその外側に隙間９ができるように鋳込用の石膏型５で包囲し、固定用ブロックの素地を石膏型の注入口８より流し込むと、前記貫通横孔３の部分は、内外とも固定用ブロック１１と連通する固定用ブロック１１が形成される。これを、窯１０内部の吊設台１２に引掛けてチューブ１が垂直になるように吊設して１６００℃で焼成するが、焼成温度が１６００℃と高温でも、前記貫通横孔３の部分は、内外とも固定用ブロック１１と連通しているので、チューブ１は落下しない。
【００１１】
加えて、固定用ブロック１１の素地と、チューブ１の素地は、上記表の関係にしてあるので、セラミックスチューブ１は約５〜７％収縮し、固定用ブロック１１は約３％収縮するので、収縮するときチューブ１は固定用ブロック１１に密着し、一層落下しなくなる。
【００１２】
【発明の効果】
前記公知公報のうち、前者のものは、１６００℃以上の焼成温度で焼成するとセラミックス質の支持ピンｅが折損することがあり、高温度の焼成では、強度不十分である。支持ピンｅの径を大きくして強度をもたせようとすると、チューブ本体ｃの孔径が大きくなり、チューブ本体ｃが焼結強度を持つ前に、約６００〜１０００℃付近で自重のために折損を起こしてしまう。また、SiC 質の支持ピンｃにすると、SiC が酸化して生成するSiO2のグレーズが孔のまわりに拡散して、チューブ本体ｃの強度を低下させる。
前記後者の公報記載のものも、焼成温度が１６００℃に達すると、アルミナ・ムライト質又はムライト質の固定ブロック素材とチューブ生製品との係合部分ｈが折損して外れ、チューブｃは落下して折損することがあった。
しかるに、本発明は、チューブ素材を押出成形機により押出してチューブ１状の成形体とし、該チューブ１の上端に貫通横孔３を穿け、該チューブ３の上端の前記貫通横孔３の稍下方に可燃性の栓４を挿着し、前記チューブ１の上端の前記貫通横孔３の部分はその外側に隙間９ができるように鋳込用の石膏型５で包囲し、固定用ブロック１１の素地を前記石膏型５の注入口８より流し込んで前記貫通横孔３の部分は内外ともブロックである固定用ブロック１１を形成し、固定用ブロック１１を窯１０内部の吊設台１２に載置してチューブ１が垂直になるように吊設して焼成する長尺セラミックスチューブ成形体の焼成方法としたから、
（イ）チューブ素材を押出成形機により押出してチューブ１状の成形体を形成するから、チューブ１状の成形体を容易に得られる。
（ロ）該チューブ１の上端に貫通横孔３を穿け、該チューブ３の上端の前記貫通横孔３の稍下方に可燃性の栓４を挿着したから、固定用ブロック１１の深さの調節ができる。
（ハ）前記チューブ１の上端の前記貫通横孔３の部分はその外側に隙間９ができるように鋳込用の石膏型５で包囲し、固定用ブロック１１の素地を前記石膏型５の注入口８より流し込んだから、前記貫通横孔３の部分は内外ともブロックである固定用ブロック１１を形成できる。
（ニ）固定用ブロック１１を窯１０内部の吊設台１２に載置してチューブ１が垂直になるように吊設して焼成する長尺セラミックスチューブ成形体の焼成方法としたから、長尺セラミックスチューブの落下の惧れは全くない。
（ホ）また、本発明は、前記チューブの素地は、１例として、略々電融アルミナの0.1 mmより小のもの５０％、電融ムライト0.1 mmより小のもの２５％、無機結合材２５％、有機結合材（メトローズ）３．５％とし、固形用ブロックの素地の１例として、略々電融アルミナの0.1 mmより小のもの２５％、電融アルミナ0.3 〜0.1 mm２５％、電融ムライトの0.1 mmより小のもの２５％、無機結合材２５％とした長尺セラミックスチューブ成形体の焼成方法とすることがある。この場合、固定用ブロック１１の素地とチューブ１の素地の関係は、セラミックスチューブ１は約５〜７％収縮し、固定用ブロック１１は約３％収縮するので、収縮するときチューブ１は固定用ブロック１１に密着し、一層落下しなくなる。
【図面の簡単な説明】
【図１】第１公知例図。
【図２】第２公知例図。
【図３】チューブの斜視図。
【図４】チューブの側面図。
【図５】固定用ブロック形成図。
【図６】長尺セラミックスチューブ成形体の焼成方法の焼成図。
【図７】固定用ブロックの素地とチューブの素地の一例の図表。
【符号の説明】
１…チューブ、２…上端、３…貫通横孔、４…栓、５…石膏型、６…下端、７…バイブレータ、８…注入口、９…隙間、１０…窯、１１…固定用ブロック、１２…吊設台。[0001]
[Industrial application fields]
The present invention relates to a method for firing a long ceramic tube molded body.
[0002]
[Prior art]
Conventionally, in publicly known Japanese Patent Application Laid-Open No. 3-218882, in firing a long ceramic tube molded body c, in order to obtain a product with less bending at the time of firing, a hole is made in the upper end portion of the tube c, A method of firing a long ceramic tube molded body is described in which a ceramic support pin e is inserted into the hole, suspended from a support hole b of a support tool a in a furnace d, and fired at a high temperature.
Japanese Laid-Open Patent Publication No. 6-321644 discloses that a horizontal hole f is formed at the upper end of a ceramic tube raw product c, the upper end of the tube raw product c is mounted in a jig mold, and the expansion ratio is a tube material. A smaller alumina mullite or mullite fixed block material is made to flow into a tube molded body with a fixed block g, and a part of the fixed block g enters the lateral hole f to become an engagement pin h. Is described in a method for firing a long ceramic tube formed body that is suspended from a support a in a kiln d and fired. Note that i is a flammable stopper.
[0003]
[Problems to be solved by the invention]
Among the above publications, the former one may break the mullite support pin e when fired at a firing temperature of 1600 ° C. or higher, and the high temperature firing is insufficient in strength. If the diameter of the support pin e is increased to increase the strength, the hole diameter of the tube body c increases, and the tube body c breaks due to its own weight before the tube body c has sintered strength. I will wake you up. In addition, when the SiC support pin c is used, the SiO 2 glaze generated by the oxidation of SiC diffuses around the hole, reducing the strength of the tube body c.
Also in the latter publication, when the firing temperature reaches 1600 ° C., the engagement portion h between the alumina / mullite or mullite fixed block material and the tube raw product breaks off, and the tube c falls. Sometimes broke. However, since the suspension structure by the engagement of the fixed block g and the tube c has more advantages than the suspension by the support pipe e, the present application further improves this.
[0004]
[Means for Solving the Problems]
Therefore, the present invention provides a tube-shaped formed body by extruding a tube material with an extruder, and pierced a horizontal hole at the upper end of the tube, and a flammable plug below the through-hole at the upper end of the tube. The portion of the through hole at the upper end of the tube is surrounded by a gypsum mold for casting so that a gap is formed outside of the tube, and the base of the fixing block is poured from the injection port of the gypsum mold. The through-hole part is a long block that forms a fixing block that is a block both inside and outside, and the fixing block is placed on a suspension base inside the kiln, and the tube is suspended so as to be vertical. This is a method for firing a ceramic tube molded body.
[0005]
【Example】
An embodiment of the present invention will be described with reference to the drawings. A material mainly composed of aluminum mullite is extruded by an extruder to form a raw product of the tube 1, dried to remove moisture, and penetrates the upper end 2 of the tube 1. A horizontal hole 3 is drilled, and a flammable plug 4 such as a foam material is inserted into the upper end 2 of the tube 1 and pushed in, so that the plug 4 is positioned below the through horizontal hole 3 and the upper end of the tube 1 is inserted. The outer periphery of 2 is surrounded by a gypsum mold 5 for casting, the lower end 6 of the tube 1 is placed on a vibrator 7, and a base of a separately prepared fixing block is poured from the inlet 8 while giving vibration to the whole. .
[0006]
At this time, the plaster mold 5 is formed so that a gap 9 is formed outside the through lateral hole 3 at the upper end 2 of the tube 1 so that a gap is formed inside and outside the through lateral hole 3. After confirming that the base material of the fixing block 11 flowing into the mold 5 is solidified, the gypsum mold 5 is removed and dried again. Then, the fixing block 11 is formed so as to communicate with the inside and outside of the through lateral hole 3.
[0007]
Next, as shown in FIG. 6, the fixing block 11 that has been transferred into the kiln 10 and solidified in the gypsum mold 5 is hooked on a hanging base 12 inside the kiln so that the tube 1 is vertical. To do. In this state, the whole is sintered at a high temperature of 1600 ° C. or higher to sinter the whole.
[0008]
When sintered in this way, both the ceramic tube 1 and the fixing block 11 can be burned out by shrinkage during sintering, the ceramic tube 1 contracts by about 5 to 7%, and the fixing block 11 is about Shrink 3%. For this purpose, the base of the fixing block 11 may be made of the same alumina alumina as the base of the tube 1 but with a coarsened alumina aggregate. As a result, the degree of adhesion between the fixed block 11 and the tube 1 is increased, and the configuration in which the fixed block 11 is provided inside and outside the through-hole 3 exhibits a fall prevention effect.
[0009]
FIG. 7 shows a table showing an example of the base of the fixing block 11 and the base of the tube 1.
[0010]
[Action]
In the present invention, the tube material shown in FIG. 6 is extruded by an extruder to form a raw product of the tube 1 as shown in FIG. 3, cut into a desired length, dried, and then the tube 1 A through hole 3 is drilled at the upper end 2 and a depth of the tube 1 is adjusted by inserting a flammable plug 4 such as a resin foam under the through hole 3 at the upper end 2 of the tube 1. Next, as shown in FIG. 5, the part of the through-hole 3 at the upper end 2 of the tube 1 is surrounded by a gypsum mold 5 for casting so that a gap 9 is formed outside thereof, and the base material of the fixing block is gypsum. When pouring from the mold inlet 8, a fixing block 11 communicating with the fixing block 11 is formed at the inside and outside of the through lateral hole 3. This is hung on a suspension base 12 inside the kiln 10 and suspended so that the tube 1 is vertical and fired at 1600 ° C. Even if the firing temperature is as high as 1600 ° C., the portion of the through horizontal hole 3 Since the inside and outside communicate with the fixing block 11, the tube 1 does not fall.
[0011]
In addition, since the base of the fixing block 11 and the base of the tube 1 are in the relationship shown in the above table, the ceramic tube 1 contracts by about 5 to 7%, and the fixing block 11 contracts by about 3%. When contracting, the tube 1 comes into close contact with the fixing block 11 and does not fall further.
[0012]
【The invention's effect】
Among the above-mentioned known publications, the former one may break the ceramic support pin e when fired at a firing temperature of 1600 ° C. or higher, and high-temperature firing is insufficient in strength. If the diameter of the support pin e is increased to increase the strength, the hole diameter of the tube body c increases, and the tube body c breaks due to its own weight before the tube body c has sintered strength. I will wake you up. When the SiC support pin c is used, the SiO 2 glaze produced by the oxidation of SiC diffuses around the hole, thereby reducing the strength of the tube body c.
Also in the latter publication, when the firing temperature reaches 1600 ° C., the engagement portion h between the alumina / mullite or mullite fixed block material and the tube raw product breaks off, and the tube c falls. Sometimes broke.
However, in the present invention, the tube material is extruded by an extrusion molding machine to form a tube 1 shaped body, and a through lateral hole 3 is formed at the upper end of the tube 1. A flammable stopper 4 is inserted into the tube, and the portion of the through-hole 3 at the upper end of the tube 1 is surrounded by a gypsum mold 5 for casting so that a gap 9 is formed outside thereof. The base material is poured from the injection port 8 of the plaster mold 5 to form a fixing block 11 which is a block inside and outside the through-hole 3, and the fixing block 11 is placed on a suspension base 12 inside the kiln 10. And since it was a firing method of a long ceramic tube formed body that is suspended and fired so that the tube 1 is vertical,
(A) Since the tube material is extruded by an extruder to form a tube 1 shaped body, the tube 1 shaped body can be easily obtained.
(B) A through hole 3 is drilled at the upper end of the tube 1 and a flammable plug 4 is inserted under the through hole 3 at the upper end of the tube 3. You can adjust.
(C) The portion of the through horizontal hole 3 at the upper end of the tube 1 is surrounded by a gypsum mold 5 for casting so that a gap 9 is formed on the outside thereof, and the base of the fixing block 11 is poured into the gypsum mold 5. Since the through-hole 3 is poured from the inlet 8, the fixing block 11 which is a block can be formed inside and outside.
(D) Since the fixing block 11 is placed on the suspension base 12 inside the furnace 10 and the tube 1 is suspended so as to be vertical and fired, the long ceramic tube molded body is fired. There is no fear of the ceramic tube falling.
(E) Further, according to the present invention, as an example, the tube base is approximately 50% of fused alumina smaller than 0.1 mm, 25% smaller than 0.1 mm of fused mullite, inorganic binder 25 %, Organic binder (Metroze) 3.5%, as an example of the base material for the solid block, 25% of fused alumina smaller than 0.1 mm, fused alumina 0.3-0.1 mm 25%, fused A method of firing a long ceramic tube formed body of 25% smaller than 0.1 mm of mullite and 25% inorganic binder may be used. In this case, the relationship between the base of the fixing block 11 and the base of the tube 1 is that the ceramic tube 1 contracts by about 5 to 7% and the fixing block 11 contracts by about 3%. It adheres to the block 11 and does not fall further.
[Brief description of the drawings]
FIG. 1 is a first known example diagram.
FIG. 2 is a second known example diagram.
FIG. 3 is a perspective view of a tube.
FIG. 4 is a side view of a tube.
FIG. 5 is a block diagram of fixing blocks.
FIG. 6 is a firing diagram of a firing method of a long ceramic tube molded body.
FIG. 7 is a chart of an example of a base of a fixing block and a base of a tube.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Tube, 2 ... Upper end, 3 ... Through hole, 4 ... Plug, 5 ... Gypsum mold, 6 ... Lower end, 7 ... Vibrator, 8 ... Injection port, 9 ... Gap, 10 ... Kiln, 11 ... Fixing block, 12 ... Hanging stand.

Claims (1)

チューブ素材を押出成形機により押出してチューブ状の成形体とし、該チューブの上端に貫通横孔を穿け、該チューブの上端の前記貫通横孔の稍下方に可燃性の栓を挿着し、前記チューブの上端の前記貫通横孔の部分はその外側に隙間ができるように鋳込用の石膏型で包囲し、固定用ブロックの素地を石膏型の注入口より流し込んで前記貫通横孔の部分は内外ともブロックである固定用ブロックを形成し、該固定用ブロックを窯内部の吊設台上に載置し前記チューブは垂直になるように吊設して焼成する長尺セラミックスチューブ成形体の焼成方法。A tube material is extruded by an extrusion molding machine to form a tube-shaped molded body, a through hole is drilled at the upper end of the tube, and a flammable plug is inserted below the through hole at the upper end of the tube, The portion of the through hole at the upper end of the tube is surrounded by a gypsum mold for casting so that a gap is formed on the outside, and the base of the fixing block is poured from the injection port of the gypsum mold, and the portion of the through hole is Firing of a long ceramic tube molded body in which a fixing block which is a block is formed on both the inside and outside, the fixing block is placed on a hanging stand inside the kiln, and the tube is hung so as to be vertical. Method.
JP07488498A 1998-03-09 1998-03-09 Method for firing long ceramic tube molded body Expired - Lifetime JP3930963B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP07488498A JP3930963B2 (en) 1998-03-09 1998-03-09 Method for firing long ceramic tube molded body

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP07488498A JP3930963B2 (en) 1998-03-09 1998-03-09 Method for firing long ceramic tube molded body

Publications (2)

Publication Number Publication Date
JPH11255565A JPH11255565A (en) 1999-09-21
JP3930963B2 true JP3930963B2 (en) 2007-06-13

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JP07488498A Expired - Lifetime JP3930963B2 (en) 1998-03-09 1998-03-09 Method for firing long ceramic tube molded body

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