JPS5828237B2 - Method for manufacturing ceramic fiber composite - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a Cera□Tsuku fiber composite, and more specifically, the present invention relates to a method for producing a Cera□Tsuku fiber composite, and more specifically, a method of manufacturing a Cera□Tsuku fiber composite by applying a refractory aggregate or a refractory aggregate and a binder to the surface of a fiber bundle made of Cera□Tsuku fibers. It is an object of the present invention to provide a method for manufacturing a ceramic fiber composite, which is characterized in that it is coated with any of the above.

The present invention also provides a ceramic fiber composite, which is characterized in that a large number of ceramic fiber composites obtained as described above are assembled and molded into various shapes such as a plate shape or a cylindrical shape. It provides a manufacturing method.

Conventionally, ceramic fibers generally have a heat resistance temperature of 12
00°C or higher, and is known as a so-called high-temperature refractory fiber.

It is also known that by using ceramic fibers as lining materials for various furnaces or molded products, the insulation properties are much better compared to linings made of conventional refractory materials such as bricks and castables. There is.

As a result, these products have come to be widely used in various fields.

Ceramic fiber molded products used for such furnace materials are made by bonding seven-dimensional fibers with a binder such as colloidal silica and aluminum, or by bonding ceramic fibers and refractory aggregate with a similar binder. death,
This is used as a molded product in various shapes such as a plate shape or a cylindrical shape.

However, these molded products are simply made of single fiber or a mixture of ceramic fiber and refractory aggregate hardened with a binder, and when these molded products are used as furnace materials for high-temperature sections, Because the Sera□Tsuku fiber shrinks or becomes powder due to crystallization,
Cracks occur in the molded product, making it more susceptible to destruction.

Furthermore, when used in a furnace with a high flow rate, there is a drawback that similarly powdered ceramic fibers are easily scattered and destroyed.

In view of these circumstances, the present inventors have developed an excellent high-temperature ceramic fiber that eliminates the above-mentioned thermal disadvantages of ceramic fiber at high temperatures without impairing its heat resistance properties and low specific heat properties. We have devised a method for manufacturing a ceramic fiber composite, which is a refractory 1#'r heat body.

That is, the present invention (by coating the surface of a fiber bundle made of d1 ceramic fibers with a refractory aggregate, etc., a ceramic fiber composite is obtained which improves thermal stability at high temperatures and has excellent heat insulating properties. The purpose is to provide a method.

The tackifiers used in the present invention include carboxylmethylcellulose and methylcellulose, which are cellulose-based synthetic thickeners, and natural thickeners such as funori, sodium alginate, starch, casein, gum arabic, and agar. etc., and these are used to impart adhesion to the fiber bundle for adhesively adhering the refractory aggregate around the ceramic fibers.

Furthermore, as the refractory aggregate of the present invention, aggregates that are extremely commonly used in the field of refractories, such as chamotte, mullite, alumina, magnesia, and zirconia, are used.

Next, a method for manufacturing a ceramic fiber composite according to the present invention will be specifically explained.

That is, a fiber bundle made of ceramic fibers is made into a predetermined size, impregnated with an adhesive solution to give adhesiveness to the surface of the fiber bundle, and then coated with a refractory aggregate and a binder. In particular, ceramic fiber composites can be obtained.

In addition, by gathering a large number of the seven-dimensional fiber composites obtained in this way, forming them into various shapes such as plates or cylinders, and drying or soot baking, ceramics can be produced. A fiber composite molded body can be obtained.

The ceramic fiber composite molded product obtained in this way has better thermal stability than conventional molded products made by hardening ceramic fibers with a binder or a mixture of ceramic fibers and aggregate with a binder. This has significantly improved the molded product, and it can now be used even at high temperatures where conventional molded products could not be used.

This is because the ceramic fiber composite is such that the surface of the fiber bundle made of ceramic fibers is covered with fireproof aggregate, etc., so the thermal stability of the composite is not affected by the ceramic fibers. Furthermore, since it is made of a refractory material that forms the skeleton of a cellular structure, its insulation properties are maintained by the ceramic fibers filled in the cellular skeleton.

Next, an example of the method for manufacturing a ceramic fiber composite according to the present invention will be described.

Example 1 Ceramic fibers are formed into fiber bundles, e.g.
(1; The surface of the aggregate made to be approximately spherical at position 772 is impregnated with a carboxymethyl cellulose CMC solution as a tackifier, and then a mixture of chamotte aggregate and alumina cement is applied to the ceramic fibers as described above. A ceramic fiber composite is obtained by coating the surface of the fiber collection material.

A large number of them are gathered together and formed into a plate shape about 20mm thick.
It was dried at 100°C to obtain a ceramic fiber composite.

This board-shaped molded body was heated at a temperature of approximately 1200°C and 1400°C for approximately 12 hours, and its properties such as shrinkage rate, bending strength, and amount of softening under load were measured, and the results shown in Table 1 were obtained. Ta.

Example 2 A Cera□Tsuku fiber composite shaped body was manufactured using a mixture of mullite aggregate and clay and treated in the same manner as in Example 1 above.

The various properties mentioned above are also shown in Table 1.

Example 3 A ceramic fiber composite molded body was manufactured in the same manner as in Example 1 using a mixture of mullite aggregate and silica sol.

The various properties mentioned above are also shown in Table 1.

The reference row ceramic fibers, mullite aggregate, and silica sol were mixed and thoroughly kneaded, and the mixture in which these three components were evenly distributed was formed into a board shape with a thickness of 20 mrn, and heated at 100°C.
The mixture was dried to obtain a ceramic fiber molded body.

Here, when the heat shrinkage rate, bending strength, and amount of softening under load of the molded products obtained by the methods shown in Examples 1, 2.3, and Reference Examples were measured, the results shown in Table 1 were obtained.

As is clear from Table 1 shown above, the fiber composite molded product according to the present invention has significantly improved thermal stability, especially at high temperatures, compared to the conventional ceramic twine bar molded product. I understand.

Next, the ceramic fiber composite molded body was heated in a furnace at 1° C.
A burner furnace at 300° C. was lined with 100 mm, and the amount of heat dissipated was measured.

In addition, a castable refractory conventionally used at a furnace temperature of 1300° C. was lined with 100 mm, and the amount of heat dissipated was determined and compared with the characteristic values of the ceramic fiber composite described above. Table 2 shows the results.

As is clear from the above results, ``7□ according to the present invention''
The Tsuku fiber composite has thermal stability at high temperatures that cannot be obtained with conventional ceramic Tsuku fiber composites.
In addition, it has superior heat insulating properties compared to conventional fireproof heat insulating materials, making it extremely useful industrially.

Claims (1)

[Scope of Claims] 1. A fiber bundle made of ceramic fibers impregnated with a tackifier is mixed with a refractory aggregate or a mixture of a refractory aggregate and a binder, and further the refractory aggregate or the refractory aggregate and a binder are mixed together. A method for producing a ceramic fiber composite, characterized in that the surface of the ceramic fiber bundle is coated with a mixture of aggregate and a binder. 2. A fiber bundle made of ceramic fibers impregnated with a tackifier is mixed with a refractory aggregate or a mixture of a refractory aggregate and a binder, and then a mixture of the refractory aggregate or a mixture of the refractory aggregate and a binder is mixed. A ceramic characterized by assembling a large number of ceramic fiber composites obtained by coating the surface of the fiber bundle of ceramic fibers with the mixture, and molding them into various shapes such as a plate shape or a cylindrical shape. Method for manufacturing fiber composites.