JPS58172260A - Manufacture of reinforced ceramic porous body - 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 a method for producing a reinforced ceramic porous body that can be used for firing purposes such as heating, and for heating purposes.

Conventionally, baking shelves used for example when firing objects to be fired, after loading, when loading and unloading before and after firing, or when transporting them are heavy and made of ceramic material with poor impact resistance, so they cannot be loaded or unloaded or transported. Not only is it inconvenient when transporting, etc., but the frequency of damage caused by hitting it against the other side is small.If only the shelf board is damaged, it is not a problem, but it can also have a negative impact on the object to be fired. There are quite a few, and for those in the industry, I was hoping for a baking box that would be relatively difficult to destroy and convenient to carry, but it was large enough.

The present inventors previously disclosed in Japanese Patent Application No. 57-25460,
A method for producing a ceramic porous body that is lightweight and relatively convenient to handle is provided.

This manufacturing method involves creating a unit assembly molded body with a desired unit contour shape, which is made of partition walls made of an organic material that easily disappears during ceramic firing, allowing the desired shape to be easily obtained. Is there a method of forming raw ceramic foam inside the wall and firing it to eliminate the organic material partitions, and automatically mass-produce the small contour shapes of each unit? Even if a porous material is obtained through a process, the pores formed by the foaming reaction on its outer surface or ridges will still be exposed, and if it comes into contact with something in this exposed state, it will be damaged or scratched. In addition to the risk of abrasion, additional processing such as dimensional adjustment and coloring is required when used as a building material or -f heating material. It became necessary to develop a manufacturing method. Furthermore, the 8th
The figure is a photograph substituted for a drawing of a ceramic porous body with a particularly high degree of foaming obtained by utilizing the invention disclosed in Tokiri No. 57-25460, and an enlarged view of an unpolished fired product. This shows the direction of the situation.

Therefore, the object of this invention is to create a reinforced ceramic material that is relatively hard to break, lightweight and convenient to carry, and is suitable for use as shelf boards for baking, as well as for other building materials and insulation purposes. This paper aims to provide a method for producing a ceramic porous body, and its characteristics are as follows. However, a ceramic foaming compounded liquid made by mixing a hydrophilic urethane prepolymer with a slurry of ceramic material and water is injected into a mold and foamed, and after reaction hardening, this raw ceramic foam is removed from the mold. Take it out, dry it, polish part or all of its outer surface and ridge lines to cause clogging of the abrasive powder in the openings in the thick part to be polished, and then bake it to create a smoothness-enhancing layer of the letter. The purpose of this method is to obtain a reinforced ceramic porous body by forming a porous ceramic material on a polished portion.

The embodiments of the present invention will be specifically explained below with reference to an example of implementation.

Figures 1 and 2 are flat curved views and cross-sectional views taken along the line 1-1 of reinforced ceramic porous bodies obtained by the manufacturing methods described later. (1) is a reinforced ceramic porous body; The holes (2) are formed by the foaming reaction, and the four sides and the ridgeline forming the corner of each city are formed by clogging the holes with abrasive powder and firing it. Developed dense smoothness-enhancing layer (3)
is formed. In addition, FIG. 4 is a photograph substituted for a drawing showing an enlarged surface state of the smoothness reinforcing layer (3) of the reinforced ceramic porous body (1) according to this example, and is a photograph substituted for a drawing showing the enlarged surface state of the smoothness reinforcing layer (3) of the reinforced ceramic porous body (1) according to this example, and is a photograph of the unpolished fired product shown in FIG. It forms a smooth surface that is noticeably denser than that of the previous one.

By the way, this manufacturing method is carried out through the steps of preparing a ceramic foaming mixture, molding, drying, polishing, and firing.

Preparation of Ceramic Foamable Mixture This ceramic foamable mix is composed of a ceramic composition and a foamable material.

(a) Ceramic composition is a muddy substance consisting of a mixture of ceramic ladle and water, and various groups & 0) are also used for Q) crab. 120 pillar stones, 40 pieces of tuna clay
A mud-like ceramic material is produced by uniformly mixing 0-layer part, alumina 500-part, and talc 400-part.

(b) The foamable material is a hydrophilic urethane prepolymer, and various compositions are used, but examples include ethylene oxide/propylene oxide copolymer aooihi and tolylene diisocyanate 7.
A hydrophilic urethane prepolymer (7% free inocyanate groups) obtained by reacting with 5 parts by weight can be used.

Mud ceramic (a) 40 as the ceramic composition
00 parts by weight, hydrophilic urethane prepolymer (b) 80
0 parts by weight were blended and stirred and mixed uniformly to prepare a ceramic foamable blended solution.

9. Silicone mold release agent was applied inward before the molding process & 8
501111W The ceramic foaming mixture was poured into a mold having a width of 850 mm and a depth of 17 mm, and reacted in 5 fractions at room temperature. During this time, the ceramic foaming mixture is foamed by reaction and hardened by reaction to form a green ceramic foam in the mold before firing.

The porosity of the ceramic-based porous material of the product may be adjusted by changing the proportion of water or hydrophilic urethane prepolymer.

Next, after the raw ceramic foam of the upper SC has reacted and hardened to an excessive hardness, the raw ceramic foam is removed from the mold. The raw ceramic foam, which has been cured by the reaction described above, is dried using the foam mold. In this example, the adhesive was dried for 3 days in a dryer at 80°C.

9 Polishing process Depending on the application, this dry product is polished with a force S1, which polishes the outer surface and some or all of the ridge lines. This is an example of polishing of a ridge line to be formed. The polishing is performed so that the openings in the part to be polished are clogged with polishing powder, and the overall shape is free from corners.

No. Firing process The polished dry product is heated to about 1860°C in a gas furnace, for example.
The temperature is gradually raised over a period of about 10 hours, held at a constant temperature for about 3 hours, and then gradually cooled to obtain a baked product.

・Thus, the 6% polyurethane material (polyurethane) in the raw ceramic foam decomposes and disappears at temperatures between 250°C and 800°C, while the ceramic components clog the pores. The abrasive powder that produced this is also sintered.

Therefore, the polished part that was clogged with polishing powder developed a dense smoothness-reinforcing layer on the surface and the corners disappeared, so the sides were reinforced and there was no chance of chipping during handling. few.

In addition, it is lighter and easier to handle than conventional shelves, and because it has a porous structure, the heat energy absorbed by the shelf itself can be reduced to a large IJ, which saves energy. This is also consistent with policy.

By the way, the above-mentioned shelf board is shown as a part of the most preferable use of the reinforced ceramic porous body according to the present invention, but it is needless to say that it is not limited to this.

In other words, it is possible to maintain a smooth surface on the entire outer surface and ridge lines, has a porous structure that provides effects such as heat insulation, and is a fire-resistant material, so it can be used as a building material. In short, applications that require a smooth, reinforced, and dense surface on part or all of the surface, and require porous properties such as porosity or heat insulation, and also require the material properties of ceramics. All applicable. Therefore, various shapes such as rod-like shapes as well as plate-like shapes can be obtained by this type of manufacturing method.

As described above, the reinforced ceramic porous body according to the present invention has
Its production involves injecting a ceramic foaming compound into a mold and causing it to foam. After reaction hardening, the raw ceramic foam is taken out of the mold, dried, and part or all of its outer surface and ridge lines are polished to remove the coating. It is obtained by clogging the pores of the polished part with abrasive powder and firing it.It has a porous structure and forms a dense smoothness-reinforcing layer in the polished part. be. Therefore, in addition to being relatively hard to break and convenient to handle, it is also beautiful and can be colored, and has a porous structure that makes it easy to use for baking shelves. It can be applied to thermal theory and various other fields by taking advantage of the above advantages.

[Brief explanation of drawings]

1- is a plan view of a reinforced ceramic porous body obtained by an implementation machine of the manufacturing method according to the present invention, and 2- is a plan view of the
Figure 8 is a copy showing the enlarged surface condition of the unpolished fired product, and Figure 4 shows the dense smoothness-enhancing layer shown in Figure 1. This is a photograph substituted for a drawing showing the enlarged surface condition of . (1)...Reinforced ceramic porous body, (2)...Opening portion, (3)...Smoothness reinforcing layer. Agent Patent Attorney Yasushi Oshima MS1 figure procedural amendment (method) % formula % 1. Indication of the case 1982 Patent Application No. 54698 2. Name of the invention Process for manufacturing reinforced ceramic porous body 3. Case of the person making the amendment Relationship with Patent applicant 1-17-18 Edobori, Nishi-ku, Osaka-shi, Osaka (314>
Toyo Tire & Rubber Industries Co., Ltd. Representative Okazaki Iharu 4, Agent Koma 550 1T 2i5-30-6, Edobori, Nishi-ku, Osaka
, Detailed Description of the Invention of the Specification Subject to Amendment - and Brief Description of the Drawings - and the accompanying drawings. 7. Contents of amendment (1) Page 3 of the specification, lines 6 to 10 [FIG. 3 shows...]. ” to be deleted. (2) Page 4, lines 16 to 20 [note 4]
The figure forms... Delete 1. (3) “Figure 2 is...
・・・・・・・・・This is a photo used as a substitute for a drawing. "of,"
FIG. 2 is a sectional view taken along the line ■--■ in FIG. 1. ” he corrected. (4) Figures 3 and 4 will be deleted. that's all

Claims (1)

[Claims] A ceramic foaming compounded liquid made by mixing a hydrophilic urethane prepolymer with a slurry of +11 ceramic material mixed with water is injected into a mold and foamed, and after reaction hardening, this raw ceramic foam is taken out from the mold. After drying, part or all of the outer surface and ridge lines are polished to cause the openings in the polished part to be clogged with polishing powder, which is then fired to cover a dense smoothness reinforcing layer. A method for manufacturing a reinforced ceramic porous body formed in the abrasive area.