JPS60166258A - Formation of large size board ceramic using non-plastic clay - 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 Molding of ceramics usually requires malleability. It is customary to use 20 to 80% clay minerals for the pot ζ that gives it plasticity. Clay minerals act as binders and maintain moldability.

As the molding method, known methods include a powder compaction method, an extrusion molding method, a cast molding method, and the like. Clay minerals are an essential ingredient in these molding methods. However, these molding methods are subject to restrictions on size and shape, that is, movement.

For transportation purposes, the strength of the green sheet is limited to a range (800 x 800) that can be carried out without the need for auxiliary equipment. We conducted research on objects and completed the development of a molding method that can withstand transportation and impact. In other words, using clay containing no plastic clay at 600 x 400
The molded product has a plate-like structure of 4III+ or higher, has green strength and flexibility, and can be moved and transported without difficulty. The details will be explained below, and 90% non-plastic ceramic clay, cement, starch, etc., are crushed from used paper to make fibers, and this is added to the 1111 clay by 6 to 1091 to make the total solid content lθ% to 2 ( [1
Anionic dispersant is added to the slurry in an amount of 02% to 1% (preferably 0.8%) to make a slurry.
%) and a cationic flocculant from 0.2 to 1% (preferably 0.8%).
) was added and stirred to form a slurry.
, 600 x 600 x 1
Wet Maputo of 0fi was molded. Another advantage of the hot heating method of the present invention is that the steps from clay production to molding to molding can be simplified.

The reason for this is explained in a separate sheet using a flowchart.

As shown in the attached flowchart, it is possible to omit 8 or 4 steps in the process from raw materials to molding.

Example (1) Basic formulation of 66% applied, 40% chinastone, 4% borosilicate glass or sheet glass powder, and 1% silicon nitride, 10# and 10% water.
(Tachi) and 10 kq of silica were placed in a bot mill and pulverized 24 hours a day, and then taken out into a 70 (Tat) container.In a separately prepared 60 (Tat) container, 1 hg of waste paper bags such as cement or starch and water were placed. Go (standing) was stirred at R speed and beaten to obtain organic fibers. This was transferred to the ceramic slurry and mixed homogeneously. In this slurry, 0.1 to 1% (preferably) of a hair anionic dispersant was added. (preferably 0.8%) and cationic T-J collector 02-1!% (preferably θB),
A floc was formed by stirring.

600X6QOX10 using a wet machine
- wet cloak. After pressing this wet mat with cold press or hot press, the temperature is 80°.
~600X600X4 after drying under the conditions of 906
*J+ green sheets were obtained. The physical properties of the obtained green sheet were as follows.

Dimensions of green sheet: 600 x 600 x 4 mm Weight of green sheet: 4 kg As mentioned above, the green sheet has flexibility and exhibits strong resistance to impact. The green sheet was transferred to a setter and fired in an oxidizing atmosphere at 1,200 to 1,280°C to obtain a lightweight ceramic with a closed-cell multi-cell structure.The bulk specific gravity of this ceramic was 0.6, and two tests were carried out. Example (2) 101 g of silica powder was treated in the same manner as in Example (1) to give 60
Example (1) of making a green sheet of 0x600x4
The same physical property tests were conducted.

Identical results were obtained. There was no row in pressing and firing. Example (B) Apply powder 10 to 9 was treated in the same manner as in Example (1) to make a green sheet of 600 x 600 x 4. Example (B)
A physical property test similar to 1) was performed, but the same results were obtained (there was no carry-on firing.) Example (4) Slc (260 mesh under) 9 to 10. Example(
A green sheet of 600 x 600 x 4 m was prepared in the same manner as in 1), and the physical properties were tested, and the results were the same as in Example (1). (However, there was no line for firing.) Example (
6) 8Amu Oh 2S i O+ (Mufui) )taf#
Wow, LItOAt10. The proportion of 48101 (Spodumene) can be adjusted separately or added with Tume Glass (Io Siot) to make a total of 10
9 and a predetermined amount of water to make a slurry with a solid content of 10 to 20%. To this, the dispersant and flocculant of Example (1) were added to make a wet mat of 600 x 600 x 10 m using a wet machine, and then cold. A green sheet measuring 600 x 600 x 4 m was formed by pressing with a press or hot press. The green sheet molding results were as follows.

Dimensions of green sheet: 600 x 600 x 4 The above green sheet was fired at 1260°C for 710 hours using a green sheet with a weight of J14 to obtain a pale yellow milky white porcelain sintered body. The sintered body was subjected to a simple thermal shock test.

That is, the green sheet was placed in a furnace heated to 800°C, held for 10 minutes, then dropped into cold water at 16°C, and repeated until cracks appeared, and the number of times the process was measured. Slight cracking occurred after 20 consecutive cycles, but it did not lead to destruction. Law 4 Dominion゛Residence Kigebep Eaves 4 Shi 5 Gu 2 Interest-Z〃/2η i hit β Sad ＾ (1) Publication 佘仄 Shinto bar carving ''嘗loss/nρ/4 (3) Derivation X Positive Irarotachi 4 Ru〃 Expenses Ha”U’zu Bud to Father〈Z Musen 7
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Description Name of the invention Method 2 for forming large plate-shaped ceramics using clay without plasticity Ceramics without plasticity at all 2 to 20% of organic and inorganic fibers are added to soil to reduce the total solid content. 5-25%
to a slurry containing 0.1 to 10% each of an anionic dispersant and a cationic flocculant (preferably 0.3% to 0.03%).
%) is added and stirred to form flocs, and then dehydrated using a wet machine or other method to stack the flocs, thereby forming a large plate-shaped ceramic having strong resistance to external stress due to movement, transportation, etc. Molding ceramics usually requires plasticity. In order to impart plasticity, 20 to 30% of clay minerals are used. Clay minerals act as binders and maintain moldability.

Molding methods include powder molding methods, extrusion molding methods, casting molding methods, etc. In these molding methods, clay minerals are an essential ingredient.

However, these molding methods are subject to restrictions on size and shape. In other words, for movement and transportation, the strength of the green sheet is within the range that can be carried out without the need of auxiliary equipment (3 o o mm x 3
00 mm).

The inventors have surpassed this limit by conducting research on rectangular or circular plate molded products of 500 mm or more, and have completed the development of a molding method that can withstand transportation and impact.

In other words, using soil that does not contain any plastic clay,
With a plate-like structure of 0 mm x 500 mtn x 4 mm or more
The molded product has green strength and flexibility, and is easy to move and transport. The details will be explained below.

Non-plastic ceramics: 90% soil and 5-10% fibrous material made by crushing waste paper such as cement and starch bags.
In addition, the slurry is mixed so that the total solid content is maintained at 10% to 20%, and an anionic dispersant of 02% to 1% (preferably 0.3%) and a cationic flocculant are added to the slurry. After adding and stirring 02% to 03% (preferably 03%) to make a slurry, this was put through a wet machine (press dehydrator) to 600 m771X 600 tnm.
A wet mat measuring 10 mm was molded.

Another advantage of the present invention is that the process from soil production to molding can be simplified.

The reason for this is explained in a flowchart on a separate sheet.
t'-) Reference Example (1) 55% applied, 40% chinastone, 4% borosilicate glass or plate glass powder, 1% silicon nitride, 10 kQ of water, 10 parts (standing), 10 parts of silica, 9 parts, Bottomino 1 After being crushed 24 hours a day, it was taken out into a 70 (vertical) container. In a separately prepared 50(i) container, 1 kq of waste paper bags containing cement or starch, etc. and 30 ml of water were stirred at high speed and beaten to form organic fibers. This was transferred into the ceramic slurry and mixed homogeneously. 0.1 to 1% (preferably 0.3%) of a hair anionic dispersant and 0.2 to 1% (preferably 0.3%) of a cationic flocculant were added to the mixture and stirred to form flocs. .

This is 600x600x10 using a wet machine.
It was made into a wet mat of mm. After pressing this wet mat with cold press or hot press, the temperature is 80
600x600x4m after drying under the conditions of °~90°
A green sheet of nz was obtained.

The physical properties of the obtained green sheet were as follows.

Dimensions of green sheet: 600 x 600 x 4 mm Weight of green sheet: 4 kQ As described above, the green sheet was shaped like a raised crescent moon, had flexibility, and exhibited strong resistance to impact. The green sheet was transferred onto a setter and fired in an oxidizing atmosphere at 1200° to 1230°C to obtain a lightweight ceramic with a closed-cell multicellular structure. The bulk specific gravity of this ceramic was 0.5.

Example (2) 10 kq of silica powder was treated in the same manner as in Example 0) to produce 60
Creating a green sheet of 0x600x4 Example (1)
A physical property test similar to that was conducted, but the same results were obtained. There was no process for carrying out firing.

Example (3) 10 kq of applied powder was treated in the same manner as in Example (1) to make a 600 x 600 x 4 green sheet, and the same physical property tests as in Example (1) were conducted, but the same results were obtained. (There were no rows during support firing.) Example (4) Sic (250 mesh under) 10 & p was treated in the same manner as in Example (1) to produce Green Sea F of 600 x 600 x 4 mm and physical property tests were conducted. , was the same as in Example (1). (There was no row in the supporting firing.) Example (5) Using 3An2032S'LO□ (mullite) fiber, T
When configuring Ji, 20 A/2o34Sio2 (spodumene), you may need to adjust it separately or
Add Li□O5in2) and add a total of 10 kQ and a predetermined amount of water to make a slurry with a solid content of 10 to 20%. To this, add the dispersant and flocculant of Example (1), and use a wet machine. After making a wet mat of 600 x 600 x 10 mm, it was pressed by cold press or hot press to form a green sheet of 600 x 600 x 4 mm. The green sheet molding results were as follows.

Dimensions of green sheet: 600 x 600

A pale yellow milky white porcelain sintered body was obtained. The sintered body was subjected to a simple thermal shock test. That is, the green sheet was placed in a furnace heated to 800℃, held for 10 minutes, and then heated to 15"C.
This process was repeated until cracks appeared, and the number of times the process was measured.

Slight cracking occurred after 20 consecutive attempts, but it did not result in destruction.

Claims (1)

[Claims] Ceramic heather clay with no plasticity and organic 'R'
Add 2 to 20% of RF@' W Kiga fiber to make a slurry with a total solid content of 6 to 2,696. Add an anionic dispersant and a cationic flocculant to this at O1 each.
~10% (preferably 0.8%) is added and stirred to form flocs, and then dehydrated using a wet machine or other method to form a layer of flocs that has strong resistance to external stresses such as movement and transportation. The present invention provides a new method for manufacturing ceramic plate materials.