JPS60207892A - Structure of ceramic fiber block-shaped single substance - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the single ceramic fiber block construction used.

Ceramic fiber is made by heating and melting a mineral raw material whose main components are alumina and silica at a high temperature of 2000°C or higher in a T-electric furnace, and then flowing the molten material through a tap nozzle to make it thin. Manufactured.

During the above-mentioned thinning, the fiber is rapidly cooled from 2000° C. or higher to around room temperature, resulting in an amorphous fiber without crystals. When the fiber thus produced is used as a heat insulating material and heated, recrystallization occurs due to precipitation of mullite or cristobalite, which is a thermally stable alumina-silica phase, at temperatures above 1000°C, causing the fiber to shrink.

This shrinkage is a fundamental property of amorphous ceramic fibers, and cannot be treated with shrinkage of fibers due to crystallization during heating.

For this reason, in furnace walls actually constructed using ceramic fibers, the joints of the block as a construction object open due to shrinkage due to the crystallization of the fibers, and heat enters through the joints, fixing the block to the steel shell. There have been many cases where metal fittings such as stud pins have been damaged by oxidation, causing blocks to fall off, and even resulting in burnout of the iron skin.

In view of these drawbacks of conventional construction examples, the present invention eliminates the drawback of joint opening caused by heat shrinkage of a block-shaped block of aged laminated fiber by using a spacer made of a mat-like material of ceramic fiber that has heat-expandable properties.・The purpose of the block installation is to protect the metal fittings and steel shell from heat, extend the life of the furnace, and improve heat resistance.

In conventional single ceramic fiber block constructions, the opening of the joints caused by the above-mentioned conditions,
Ceramic fiber blankets or cut strips of blocks are used as spacers in the gaps (joints) created by the juxtaposition of the blocks.

However, when constructing the block, the spacer is made by mechanically compressing a ceramic fiber blanket by 20 to 30%, or by slicing a single ceramic fiber block in parallel to the stacking direction. Therefore, due to insufficient compression, it may not be able to fully function as a spacer, heat shrinkage may cause joint openings, or spacers may not be inserted into the gaps between blocks insufficiently due to differences in the skills of individual constructors. After the furnace was heated, heat shrinkage caused the steel to fall off, which caused the steel skin to burn out.

Therefore, the present invention aims to solve the drawbacks of a single ceramic fiber block structure in which spacers made of thermally expandable ceramic fiber molded bodies are filled and inserted into the gaps (joints) of the blocks. That is, by using the spacer (gap filler) 1c described in claims 2 and 3 and providing a structure in which the block is installed on a furnace wall, etc., the unheated and unexpanded state can be Spacers can be easily and quickly filled and inserted into the gaps between blocks, and at the time of initial heating, such as when firing up a furnace, the restraint of the organic adhesive is removed, and at the same time, the adhesive exhibits fluidity and thermally expands. and the spacer are glued and joined,
No block gaps are created during cooling. Also,
When the spacer of the present invention is reheated in the furnace, the spacer and the block are strongly bonded, so the spacer is pulled in the stacking direction and follows it, exhibiting a buffering effect, which prevents the occurrence of joint opening between the blocks. can be prevented.

Hereinafter, the features of the single ceramic fiber block-like structure of the present invention will be specifically explained based on the drawings.

FIG. 1 is a longitudinal cross-sectional view of the most typical embodiment of the ceramic fiber block-like unitary structure of the present invention, and in this drawing, AI, ! -A2...... is a spacer, B1 and B2...... are ceramic fiber block-like units, and C is a furnace wall surface made of iron shell etc. , D+ and B2...
... is a fixed bin for attaching a block-shaped unit.

The block ◎ is attached to the furnace wall surface through a fixing pin at attached to the iron shell (Q).Then, in the gap between the blocks (Bl) and (B2), a spacer (A2 ) is inserted in a filled state.

FIG. 2 is a plan view corresponding to the above-mentioned FIG. 1 of the ceramic fiber block-like single structure of the present invention, and in this drawing, AI, A2, A3... are spacers, Bl, B2, . . . are single ceramic fiber blocks. Note that the longitudinal section of the structure shown in FIG.
It is cut in the longitudinal direction (vertical direction) along the x' plane.

Further, the block attached as described above is attached so that the fiber direction of the block and the xx' direction are parallel to each other.

In the plan view of FIG. 2, a spacer A, which is a sheet-like molded body having heat-expandable properties, is inserted between the blocks (2) used in the construction of the present invention. The connecting portions of adjacent sheet-like molded bodies are attached to the four corners of block B. Note that the spacer prisoner and the block ■ should be almost perpendicular to each other. The blocks thus attached were heated in an electric furnace under the conditions shown in the table below. In addition, the maximum operating temperature of the block used is 1300
A $1,300 grade material with a temperature of 1,300 °C was used, and it was heated and maintained at 1,400"C for accelerated testing. Although no coating material was applied to the block surface, the entire construction of these blocks and spacers was observed. The results are summarized in the table below.As a result of observation after heating at 1200° for 24 hours, no crank joint opening occurred at the interface between the sheet-shaped molded body and the block.
C was heated for 24 hours and observed, and the result was that the block was installed perpendicularly to the fiber direction of the block, as shown by Al and A3 in the longitudinal cross-sectional view of FIG.

Table of heating conditions and experimental results 1-2 spacers in the center of the sheet material! A crack of about ff was generated. This crack is a crack that occurs when the blocks on both sides of the sheet-like molded object contract and pull together, and compared to a crack of about 1 sm that occurs in the center of the sheet-like object, when this sheet-like object is not inserted. The resulting joint gap was about 10 degrees. Therefore, the sheet-like material should have a joint opening of about 10ff, which should be about 10ff.
There is an effect that can be suppressed to mg. This 1ff crack was approximately 1OcII deep, and was confirmed by disassembly.

On the other hand, 10
The joint opening of ff is as deep as 2001 or more, and when heated further, the joint opening progresses deeper. No other joint opening cracks were observed.

By inserting the sheet-like material in this way, it is possible to significantly suppress the opening of the joints at the connecting portions of the blocks.

As described above, according to the present invention, it is possible to provide a structure in which the joints (gaps) of ceramic fiber blocks are filled and inserted using spacers containing a heat-expandable substance. Attaching the block can sufficiently protect the metal fittings and steel shell from heat without causing joint opening, and is extremely useful for extending the life of the furnace and improving heat resistance.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of the ceramic fiber block-like single structure of the present invention, and FIG. 2 is a plan view of the ceramic fiber block-like single structure of the present invention. In these drawings, AI and A2-...
... is a spacer, and Bl and B22. ...-
... is a single ceramic fiber block, and C
is the furnace wall surface made of iron shell etc., and Ds and B2
・・・・・・・・・・・・ is a fixing pin for attaching a block-like unit. Patent Applicant IBIDEN Co., Ltd. Representative Jun Taga Part 1 "±" Procedural Amendment (Voluntary) June 29, 1985 Commissioner of the Patent Office Manabu Shiga 1 Toha 1, Indication of Case 1988 Patent Application No. 64514 No. 2, Name of the invention Ceramic fiber block-shaped single structure 3, Relationship with the amended case Applicant's residence Address: 2-1-4 Kanda-cho, Ogaki City, Gifu Prefecture, 508
Subject of amendment 5, Contents of amendment attached to amended specification hJ, -U' correction ■f] Correction specification 1, Title of invention Ceramic fiber block-shaped unitary structure 2, Claim 1, Ceramic In a structure in which a ceramic fiber block-like unit made by laminating or folding fiber mats is installed so that the side surface thereof is substantially perpendicular to the furnace inner wall, in the gap created when the ceramic fiber block-shaped units are arranged side by side, -17. Pregnancy = ± Shijo 4 Ceramic fiber aggregates are 10
A spacer made of a sheet-shaped molded body bound to a bulk density of 0.1 to 0.8 fA with an organic adhesive that softens and exhibits fluidity in the temperature range of 0 to 850°C was filled and inserted. A single ceramic fiber block structure. 2. The spacer contains an organic adhesive of thermoplastic resin and thermosetting resin that softens and exhibits fluidity in a temperature range of 100 to 850°C. A construct according to scope 1. 8. Claim 1, wherein the spacer contains 2 to 15% by weight of an organic adhesive based on 100 parts by weight of the ceramic fibers, and the ceramic fibers are restrained by the adhesive. The construct according to Sections 1 and 2. 8. DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a ceramic fiber block-like structure using a heat-expandable spacer. Ceramic fiber is manufactured by heating and melting mineral raw materials whose main components are alumina and silica in an electric furnace at a high temperature of over 2000°C, and then flowing the molten material through a tap nozzle to make it thin. has been done. During the above-mentioned fiber formation, the fiber is rapidly cooled from 2000°C or higher to around room temperature, resulting in an amorphous fiber without crystals. When the fiber thus produced is used as a heat insulating material and heated, recrystallization occurs due to precipitation of mullite or cristobalite, which is a thermally stable alumina-silica phase, at temperatures above 1000°C, causing the fiber to shrink. This shrinkage is a basic property of amorphous ceramic fibers, and fiber shrinkage due to crystallization during heating cannot be avoided. For this reason, in furnace walls actually constructed using ceramic fibers, the joints of the block as a construction object open due to shrinkage due to the crystallization of the fibers, and heat enters through the joints, fixing the block to the steel shell. There have been many cases where metal fittings such as stud pins have been damaged by oxidation, causing blocks to fall off, and even resulting in burnout of the iron skin. In view of the drawbacks of conventional construction examples, the present invention uses a spacer made of a sheet of ceramic fiber that has thermal expansion properties to eliminate the drawback of joint opening caused by heat shrinkage of a single ceramic fiber block. The purpose of the block installation is to protect the metal fittings and steel shell from heat, extend the life of the furnace, and improve heat resistance. In conventional single ceramic fiber block constructions, the opening of the joints caused by the above-mentioned conditions,
Ceramic fiber blankets or cut strips of blocks are used as spacers in the gaps (joints) created by the juxtaposition of the blocks. However, when constructing the block, the spacer is made by mechanically compressing a ceramic fiber blanket by 20 to 30%, or by slicing a single ceramic fiber block in parallel to the stacking direction. Due to insufficient compression, the spacer may not be able to fully function as a spacer, or heat shrinkage may cause joints to open, or spacers may not be inserted into the gaps between the blocks insufficiently due to differences in the skill of individual installers. After being fired, the iron skin would sometimes fall off due to heat shrinkage, which caused the steel skin to burn out. Therefore, the present invention solves the drawbacks of a single ceramic fiber block structure by filling and inserting a spacer made of a thermally expandable ceramic fiber molded body into the gap (joint) between the blocks. In other words, by providing a structure in which blocks are installed on a furnace wall or the like using the spacers (gap fillers) described in claims 2 and 8, the unheated and unexpanded state can be improved. Spacers can be easily and quickly filled and inserted into the gaps between blocks, and at the time of initial heating, such as when firing up a furnace, the organic adhesive exhibits fluidity and is no longer constrained, causing thermal expansion.
Furthermore, the blocks and spacers are bonded and joined, so that no gap between the blocks occurs during cooling. In addition, when the spacer of the present invention is reheated in the furnace, the spacer and the block are strongly bonded, so the spacer is pulled in the stacking direction and exhibits a buffering effect by following the direction.
It is possible to prevent openings between blocks from occurring. The spacer used in the present invention is bound with 2 to 15 parts by weight of an organic adhesive that fluidizes in a temperature range of 100 to 850°C based on 100 parts by weight of fiber, and its bulk specific gravity is 0.1 to 0. .8 f/d is required. Since the restoring ability of the fiber is greatly reduced at temperatures above 850°C, great restoring performance can be obtained if the restriction is removed at temperatures below that temperature. However, if the temperature is less than 100°C, it becomes a problem in handling, so an organic adhesive that fluidizes at 100°C to 350°C is suitable. Also, the bulk specific gravity is 0.1 f/
If it is less than aA, the restoring ability is small, and if it is more than 0.8 f/d, the fibers will break and the restoring ability will decrease. Furthermore, if the amount of adhesive added is less than 2% by weight, the fibers cannot be restrained, and if the amount is 15 or more, the restoration performance will be hindered. Examples of organic adhesives include soft thermoplastic resins such as latex, hard thermoplastic resins such as vinyl acetate and acrylic, and more preferably soft thermoplastic resins such as latex and thermoplastic resins such as phenol with a small amount of heat. It is a mixture of hardening resin. For example, phenol is 0.1 to 1.0 parts by weight with respect to 100 parts by weight of ceramic fibers, and the remainder is latex, and the total amount of phenol and latex is 2 to 15 parts by weight. The spacer made as described above has a temperature of 100 to 850.
It has the property of expanding more than twice its thickness in the temperature range of ℃. Hereinafter, the features of the single ceramic fiber block-like structure of the present invention will be specifically explained based on the drawings. FIG. 1 is a longitudinal cross-sectional view of the most typical embodiment of the ceramic fiber block-like structure of the present invention, and in this drawing, A1 and A2 are spacers, and Bl and B2 are single ceramic fiber blocks, C is the furnace wall surface made of iron skin, etc., and Dl and B2 are
... is a fixed bin for attaching a block-shaped unit. The block (B) is attached to the furnace wall via a fixing bin (D) attached to the iron shell (C). A spacer (A2), which is the most characteristic feature of the present invention, is inserted into the gap between the blocks (B1) and (B2) in a filled state. FIG. 2 is a plan view corresponding to the above-mentioned FIG. 1 of the ceramic fiber block-like structure of the present invention, and in this drawing, At-A2, A3, . . . are spacers, and Bl , B2... is a single ceramic fiber block. Note that the longitudinal section of the structure shown in FIG. 1 is at x in the plan view of FIG.
It is cut in the longitudinal direction (vertical direction) along the plane -x'. Further, the block attached as described above is attached so that the fiber direction of the block and the x-x' force direction are parallel to each other. In the plan view of FIG. 2, a spacer A as a sheet-like molded body having heat-expandable properties is inserted between the blocks (B) used in the construction of the present invention. The connecting portions of adjacent sheet-like molded bodies are attached to the four corners of block B. In addition, spacer (A,
) and block (B) should be in sufficient contact with each other on their entire joint surfaces. In addition, in Fig. 2, spacers (A2), (
The fiber arrangement direction of A4) is parallel to the fiber arrangement direction of block (B), and the fiber arrangement direction of spacers (AI) and (AS) is perpendicular to the fiber arrangement direction of block (B). The thus attached block was heated in an electric furnace under the conditions shown in Table 1 below. The block used is Su180, which has a maximum operating temperature of 1800°C.
0 grade is used, and 1400 is used for accelerated testing.
The temperature was maintained at ℃. The results of observing the construction of these blocks and spacers are summarized in Table 2 below. 1
As a result of observation after heating at 200° C. for 24 hours, no cracks or joint openings were observed at the interface between the sheet-like molded body and the block. This was further heated at 1400° C. for 24 hours and observed. The results are summarized in Table 2, and the blocks and spacers were each disassembled and observed. Table 1 - Temperature increase conditions Table 2 - Experimental results Approximately 1 to 2 cracks (1111) were generated in the center of the spacer of the sheet material. This crack was caused by the blocks on both sides of the sheet-shaped molded product contracting and pulling together. Compared to the IH-sized crack that occurred in the center of the sheet-like material, the joint opening that occurred when this sheet-like material was not inserted was about 10n. Therefore, for sheet-like materials, the joint opening, which should normally be about 10 mm, is approximately 1H.
There is an effect that can be suppressed. It was confirmed through disassembly that the depth of this III crack was about 10α. On the other hand, the joint opening of 10jEll which occurred without inserting the sheet-like spacer was as deep as 201 or more, and when further heated, the joint opening progressed deeper. No other joint opening cracks were observed. By inserting the sheet-like material in this manner, it is possible to significantly suppress the opening of the joints at the connecting portions of the blocks. As described above, according to the present invention, it is possible to provide a structure in which the joints (gaps) of ceramic fiber blocks are filled and inserted using a heat-expandable spacer, so that the joints of the blocks do not open. The installation of the block can sufficiently protect the metal fittings and steel shell from heat without having to do so, and is extremely useful for extending the life of the furnace and improving its heat resistance. 4. Brief description of the drawings FIG. 1 is a longitudinal cross-sectional view of the ceramic fiber block-like structure of the present invention, and FIG. 2 is a plan view of the ceramic fiber block-like structure of the present invention. be. In these drawings, A+ and A2...
・ is a spacer, B+ and B2... the curve is a single ceramic fiber block, C is the furnace wall surface made of iron shell etc., Dl and B2...
... is a fixing pin for attaching a block-like unit. Patent applicant IBIDEN Co., Ltd. Representative Ichiro Tagabo

Claims (1)

[Claims] (1) In a structure in which a single ceramic fiber block formed by laminating or folding ceramic fiber mats is attached so that the side surface thereof is substantially perpendicular to the inner wall of the furnace, the ceramic sheet-shaped molded body is A single ceramic fiber block structure filled with and inserted spacers. 2. Inn spacer, which contains an organic adhesive between a thermoplastic resin and a thermosetting resin that softens and exhibits fluidity in a temperature range of 100 to 350°C. Construct according to paragraph 1. 3. The spacer contains 2 to 15% by weight of an organic adhesive based on 100 parts by weight of the ceramic fibers, and the ceramic fibers are restrained by the adhesive. Constructs described in Section.