JPS623904A - Manufacture of ceramic pipe - 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] (Industrial use minute hand) The present invention relates to a novel method for manufacturing a cefmic pipe.

(Conventional technology) Conventionally, the method of manufacturing ceramic pipes is as follows.

Cast the specified ceramic rough material into the mold.

A molding method for obtaining a desired pipe-like object and an extrusion method for obtaining a desired pipe-like object by extruding a predetermined ceramic slurry using an extruder are known.

(Points to be Solved by the Invention) However, the conventional manufacturing method described above has the following drawbacks.

In other words, the molding method is capable of manufacturing short, thick-walled pipes, but it is not suitable for manufacturing long or thin-walled pipes, and has the problem of inferior productivity.On the other hand, extrusion Although the molding method is excellent in terms of productivity, it does not have one-dimensional accuracy, and like the mold molding method, it is difficult to manufacture thin-walled products.

The present invention was invented based on the above circumstances, and an object of the present invention is to provide a new manufacturing method that can efficiently and continuously produce ceramic pipes having excellent quality such as strength.

(Solution) The manufacturing method of the present invention is ceramic-free.

Burns during ceramic sintering and seals the surface of rod-shaped or pipe-shaped objects that can be incinerated to a predetermined thickness to prevent destruction.

Next, the ceramic pipe is manufactured by solidifying the ceramic rough material through a drying process, followed by a sintering process, and then burning, incinerating and removing the rod-like or pipe-like material.

Next, each component of the present invention will be explained in detail.

Ceramic slurry is made by mixing inorganic powder such as alumina with clay minerals completely mixed with water glass.

distributed and coordinated. The water glass acts as a binder, suppressing the occurrence of cracks, grains, etc. when the heptaramic is completely sintered, making it possible to obtain a product with excellent strength.

The raw material composition of the ceramic slurry is appropriately determined in view of the above circumstances.9 For example, inorganic powder such as alumina55-8
5% by weight, clay minerals 10-25% by weight, water glass 5
~20% of the sets are used.

As a rod-shaped or pipe-shaped object, 1! Although it is necessary to be made of a material that can be burned and ashed during lamic sintering, resin 1 paper or the like is preferably used and fits in the beak.

Further, as a means for coating such rod-shaped or pipe-shaped objects with Ceramirafus Freela to a predetermined thickness.

An extrusion molding method using an extruder or a dipping method is used.

The drying process has a great effect on the quality of the molded product obtained, and in particular, if it is dried too quickly or sintered without being sufficiently dry, air bubbles may occur in the resulting ceramic pipe or cracks may occur. , cracks, etc. occur. In view of the above circumstances, the present invention does not include vacuum F (4
At 00 to 5QQmmf (/), approximately half or more of the volatile matter in the ceramic free is dried from the inside.

Thereafter, a method is employed in which the remaining volatile components are sufficiently dried under normal pressure heating (50 to 400°C).

If heat drying is used, air bubbles are likely to be generated inside the product, and the resulting product is likely to be non-uniform, making it impossible to obtain a product with satisfactory strength.

In the sintering process, the temperature gradient between the T and F limits of the sintering temperature is controlled by the type of ceramic, the raw material composition of the slurry, etc., but the temperature gradient can be reduced by 1 gM force.
(4) It is preferable in terms of the quality of the molded product.

Hereinafter, the present invention will be explained in detail based on examples.

(Example 1) Clay minerals 15 weight %, water glass 15% by weight.

A ceramic slurry was prepared by uniformly mixing and dispersing 70% by weight of alumina powder, and this ceramic slurry was charged into an extruder.

A paper pipe (outer diameter 10 mmφ, wall thickness 2 mm) was used as a core material, and the outer surface of this core material was coated with ceramic slurry having a wall thickness of 2 mm at a total extrusion speed of 3 m/min. Next, one layer of the ceramic slurry was vacuum dried (180°C x 50°C).
0 m ml (px 3 minutes) and further heated at normal pressure T' (
-1! One layer of lamic slurry was solidified. After that, 1800'C±1
A sintering process was performed at 00° C. for 60 minutes to burn the paper pipe, incinerate it, remove it from the ceramic, and cut it into a predetermined length to obtain the desired ceramic pipe 'cT'4.

The obtained product had no cracks, cracks, internal bubbles, etc., and had a high strength.

(Example 2) 100 parts by weight of the ceramic free used in Example 1 was further mixed with 15% by weight of water.

A polyethylene resin rod (diameter IQmmφ) was dipped into the dispersed and adjusted slurry.

A single layer of slurry having a thickness of 0.5 mm was formed on the surface of the polyethylene resin rod by passing through a wall thickness adjustment jig (guide).

Next, this was vacuum dried (70°C
(7t, ><3 minutes), and then drying at normal pressure (70°
OX3 minutes). Then 1600'O±100°C
A sintering process was performed for 20 minutes to burn off the resin, incinerate it, and remove it from the ceramic to form the desired thin-walled ceramic via.The resulting product was As in Example 1, there were no cracks, no bubbles, no internal bubbles, etc., and the material had a high strength.

(Effects of the Invention) By the manufacturing method of the present invention as detailed above, vias of high dimension and tightness with excellent strength and no cracks, cracks, internal bubbles, etc. can be produced not only as short products but also as elongated products. In terms of efficiency, it is easier to manufacture.

In addition, according to the manufacturing method of the present invention, since a single layer of ceramic material is once formed on the core material (rod-shaped or pipe-shaped object), extremely thin-walled pipes with a wall thickness of 1 mm or less, which could not be obtained with conventional methods, can be produced. can be manufactured.

Patent source

Claims (3)

[Claims] (1) Ceramic slurry prepared by mixing and dispersing clay minerals, water glass, and inorganic powder such as alumina is burnt during ceramic sintering to form a predetermined thickness on the surface of a rod-shaped or pipe-shaped object that can be ashed. The method is characterized in that a ceramic pipe is manufactured by coating the ceramic slurry with a ceramic slurry, then solidifying the ceramic slurry through a drying process, further performing a sintering process, burning the rod-like or pipe-like object, and removing it by ashing. How to make ceramic pipes. (2) The method for manufacturing a ceramic pipe according to claim (1), wherein the rod-shaped or pipe-shaped object is made of resin or paper. (3) The method for manufacturing a ceramic pipe according to claims (1) and (2), wherein the drying treatment is first vacuum drying and then heat drying.