KR20010036010A - Method for the preparation of the fireproof disc for adiabatic float - Google Patents

Abstract

PURPOSE: A method for preparing fireproof disc of insulating float is provided which simplifies manufacturing process more than conventional method and provides the fireproof disc having improved performance. CONSTITUTION: The method comprises steps of: (i) mixing raw materials wherein, 100 parts by weight of ceramic fiber, 50-200 parts by weight of filler and 5-50 parts by weight of heatproof binder are used as main materials and ripening the mixture; (ii) drying and processing the mixture to prepare circular plate discs of equal standard; and (iii) after ply-binding the discs at fixed thickness by simply compression-processing the discs, post-treating the discs to prepare the fireproof disc.

Description

Method for the preparation of the fireproof disc for adiabatic flutes

The present invention relates in particular to a method for producing a fireproof disc for adiabatic flutes, which is a device for controlling the flow of molten aluminum upon melting aluminum and then transferring it to a mold of a desired product.

In general, aluminum has excellent corrosion resistance and is light, so that it is easy to process in various forms such as plates, foils, and seals, and thus is widely used as a building material, transportation parts, chemical apparatus or household goods.

In addition, since aluminum has a low melting point, it is easy to simply dissolve it in any type of furnace. When the molten aluminum is transferred to a mold of a desired shape, the refractory disk 1 is used as a mechanism for controlling the flow of molten aluminum. ), A flute consisting of a shaft 2, a plate 3, a stopper 4 and a bottom 5 is used.

At this time, the flute is used to control the amount of aluminum melt, that is, when the aluminum melt is full, the stopper of the float of the melt is opened to flow molten aluminum to a desired mold to be manufactured, and the amount of aluminum melt If the level is lowered to a certain level, the flute plug is closed.

On the other hand, the refractory discs used in the flute should use a material having excellent thermal insulation to withstand high temperatures, conventionally used refractory discs are mixed with a filler such as wollastonite of high density fine powder (Wallastonite) After manufacturing in a thin plate shape through compression molding and drying process, a large amount (approximately 10-30 pieces) of disks are manufactured to fit a desired thickness and shape, and then each is bonded with an adhesive as shown in FIG. To make it.

However, the refractory disc manufactured by the conventional method as described above has a problem in that the whole material is deformed when the melt penetrates, because it is easy to generate fine cracks or bubbles during curing due to the use of wollastonite as a main material. Due to the difference in thermal expansion coefficient and thermal expansion coefficient between the disk and the adhesive, there is a problem in that separation or cracking occurs easily at the time of expansion and contraction at high temperature.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a fire-resistant disk that is easy to manufacture and improved in performance compared to conventional products.

1 is a cross-sectional view of a conventional adiabatic flute

2 is a cross-sectional view of the insulating flute in accordance with the present invention

3 is a perspective view of a single disk

* Explanation of symbols for main parts of the drawings

1: refractory disc, 2 shaft, 3 plate, 4 stopper, 5 bottom

According to the present invention, raw materials are mixed, matured, molded, dried, and processed to manufacture discs on a disc, and the above discs are laminated and bonded to have a thickness in accordance with a float standard, and then a post-treatment step is used to produce a fireproof disc. The present invention relates to a method of manufacturing a refractory disc for thermal flute using ceramic fibers, fillers, and heat-resistant binders as a main raw material, and integrating the discs by simply compressing the chips when laminating the discs. The invention will be described in detail.

In the present invention, a ceramic fiber, a filler, and a heat resistant binder having excellent thermal insulation and low density as a main raw material of a refractory disk are used. In this case, the filler and After aging with the binder, pressing is performed to a predetermined thickness.

At this time, the amount of the raw materials is 5 to 50 parts by weight of heat-resistant binder, such as liquid silica sol used to combine them, fillers such as talc, wollastonite, alumina powder, and sepiolite with respect to 100 parts by weight of ceramic fiber. Additives are preferred, in addition to these, a large amount of water or other additives for improving physical properties may be added.

Meanwhile, the product press-molded to a predetermined thickness using the above materials is dried to have a water content of approximately 10% or less, and then processed into a disc shape conforming to a predetermined standard, as illustrated in FIG. 3. Make single discs. The disks thus obtained are stacked as many as necessary to obtain a fireproof disk having a desired thickness, and then integrated by compression processing by a hydraulic press or the like and then subjected to a post-treatment process such as lathe processing, surface coating and drying, and the shape illustrated in FIG. 2. A fireproof disc of is manufactured.

Hereinafter, the present invention will be described in more detail with reference to Examples.

Example 1

(1) 100 parts by weight of the ceramic powder, which had completed the short removal operation, was spun and then mixed with 30 parts by weight of wollastonite, 50 parts by weight of alumina powder, 20 parts by weight of liquid silica sol, and an appropriate amount of water.

(2) The mixed slurry was filtered and the remaining solid raw material was press-molded into a plate shape of 5cm thickness, cut into 120cm width and 60cm length, and then dropped onto a pallet with a vacuum transporter and dried until the moisture content was about 5%. Next, it was processed into a circular plate having a diameter of 20 cm and an inner diameter of 1 cm.

(3) After stacking six sheets of the above-mentioned disks, they were integrated by pressurizing with a hydraulic press to prepare a cylindrical fire-resistant disk.

(4) The surface of the refractory disc obtained above was subjected to lathe processing to the correct dimensions, and then the surface was coated with a liquid silica sol and dried at a temperature of 300 ° C. to produce a refractory disc having a melting temperature of approximately 1,700 ° C.

As described above, when manufacturing a refractory disc for a single insulated flute, since there is no bonding process compared to the existing process, the manufacturing process is simple and is simply combined by ply compression. There is no risk of cracking due to cracking, and there are few cracks or bubbles in general drying, so there is no problem such as aluminum penetrating when using the product. Usability such as light weight can be obtained.

Claims (3)

In the manufacture of disc-shaped discs of the same standard through mixing aging, molding, drying and processing of the raw materials, and then laminating and combining the discs to a predetermined thickness and then producing a fire-resistant disc through a post-treatment process, A ceramic fiber, a filler, and a heat resistant binder are used as a method of manufacturing a fire-resistant disk for a single-floor flute, characterized in that the disks are integrated by simply performing compression processing when the disks are laminated. The method of claim 1, wherein the amount of the main raw material is in the range of 50-200 parts by weight of filler and 5-50 parts by weight of heat resistant binder, based on 100 parts by weight of ceramic fiber. The method of manufacturing a refractory disc for a heat insulated flute according to claim 1 or 2, wherein the heat resistant binder is a liquid silica sol.