JPS58188559A - Refractory plate material for sliding nozzle - Google Patents

Abstract

PURPOSE:To eliminate the generation of various troubles owing to deviation, by using a castable refractory material in the outside circumferential part and joining said material to a central member by means of studs thereby making the joining force between the dissimilar materials secure and preventing the deviation between each other during the work. CONSTITUTION:A central member 5 provided with a discharge port 4 for molten metal is a calcined refractory material consisting essentially of zirconia and a fastening fitting 8 of the width narrower than the thickness 7 of a refracotry plate material 6 is mounted on the circumferential side surface thereof by a method such as shrinkage fit. Stud 9 of a V shape or the like is beforehand welded to the outside surface of the fitting 8. Such material as a central member is set and a castable refractory material of high alumina type is cast as an outside circumferential member, whereby the material 6 is obtained. A clamp 10 may further be mounted to the outside of the material 6, if necessary.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is directed to an improvement in an insert-type plate refractory for a sliding nozzle device.

Conventionally, insert-type plate refractories have been known in which a corrosion-resistant refractory is attached to the molten metal discharge port part that comes into contact with molten metal in order to improve the corrosion resistance against molten metal in the grate refractories of sliding nozzle devices. ing.

The resistance of this insert-type plate refractory to molten metal is determined by the characteristics of the insert refractory. For example, zirconia is known as an excellent material, but in recent years, plate refractories have become larger. As this progresses, thermal expansion differences, i-cases, etc. have come to appear as factors that cannot be ignored.

In other words, conventional insert-type plate refractories are basically melt-resistant, as shown in Figures 1(a) and (b).
, a material 1 having high corrosion resistance against slag, etc. is placed around the molten metal outlet, and this is attached to the fired refractory plate 2.
It is set using mortar 3, and various materials and structures are known.

However, due to the generation of abnormal stress due to the difference in thermal expansion between different materials, application of surface pressure, and mechanical external force applied to the plate due to sliding, the contact surface of the mortar comes off, causing the insert to protrude and fall, causing the molten metal discharge port to fall. This often led to problems such as edge chipping, uneven surface pressure, and metal cutting.

This invention improves the drawbacks of insert-type plate refractories that are bent, and uses a highly corrosion-resistant material in the part that comes into contact with molten metal as a central member, and the peripheral side of this central member is In this method, a fastener whose width is narrower than the thickness of plate refractories is used, and this is integrally cast with castable refractories to form plate refractories.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 is a plan view of a plate refractory showing an embodiment of the present invention, in which a central member 5 having an outlet 4 through which molten metal passes is a fired refractory whose main component is zirconia.

As shown in the longitudinal sectional view of FIG. 2, a fastening metal fitting 8 having a width narrower than the thickness 7 of the plate refractory 6 is attached to the peripheral side surface of the central member 50 by burning or other methods.

A V-shaped stud 9 or the like is welded to the outer surface of the fastening fitting 8 in advance. This is set as a central member 5, and a high alumina castable refractory is poured in as an outer peripheral member to form a plate refractory 6. If necessary, a fastening fitting 10 may be further attached to the outer periphery of the plate refractory 6.

The occurrence of cracks in the plate refractory of the present invention was compared with that of a plate refractory having a conventional structure that does not use fasteners.

Both the central member and the outer peripheral member have approximately the same shape, and
The same material was used. Figure 3 shows a conventional plate refractory structure in which zirconia insert bricks are cast with an alumina castable refractory, and Figure 4 shows a plate refractory structure of the present invention, in which zirconia insert bricks are cast with alumina castable refractories. A fastening fitting is attached to the.

A hoop is fired on the outer periphery of both plate refractories.

The conditions for generating IA fissures were to heat the inside of the outlet using a burner (LPQ+oxygen). Raise the temperature to 1500"C and
It was held for 5 minutes and allowed to cool.

As shown in Figures 5 and 6, in the plate brick of the conventional structure, cracks occurred in the central member and extended to the outer peripheral member, whereas in the plate brick of the present invention, cracks occurred in the central member. The crack ends at the end and does not extend to the outer peripheral member. When wrapping fasteners around the outer periphery of the central member, the width of the fasteners should be less than the thickness of the plate refractories when two or three such plate refractories are used in combination. Since it is a device, this is to prevent the fastening metal fittings from protruding into the sliding surface.

Further, the holding mechanism for holding the castable refractory to the fastening fitting may be a simple one made by welding a V-shaped stud, for example, as shown in the figure of the embodiment, but a mechanism having a similar holding force may be used. If so, it may have another structure.

On the other hand, in this invention, a case has been described in which zirconia is used for the central member and high alumina castable is used for the outer peripheral member, but it is of course possible to use other commonly used materials, or two types of materials may be used. It can also be made with three layers using three types of materials.

This invention also includes modifications that apply techniques used in other fields.

For example, as shown in FIG. 2, by wrapping a hoop 10 around the outer periphery of the plate refractory, even if a crack occurs in the outer peripheral member, the refractory will not become unusable immediately.

In addition, when using materials with a large difference in thermal expansion between the center member and the outer peripheral member, as shown in Fig. 7, it is possible to reduce the stress by inserting a sheet of inorganic fiber such as ceramic fiber 11 at the boundary. can be absorbed.

FIG. 8 shows a hoop 10 wrapped in castable refractory material with a square stud 9 welded to the inner surface of the hoop 10, which further strengthens the bond between the castable refractory material and the hoop.

In FIG. 9, stainless steel wire, wire mesh, etc. 12 are buried in advance when casting the castable in order to reinforce the castable refractory itself on the outer periphery.

In Fig. 1θ, the fixing metal is thermally expanded by the temperature of the molten metal, and the cooling mechanism is provided to prevent the bonding force from decreasing.
This L
Similarly, a device having a structure to be cooled by cooling gas may be used in combination.

The plate refractories of this invention use castable refractories on the outer periphery and are connected to the center member using studs, so the joining force between dissimilar materials is strong and there is no misalignment during operation. This made it possible to further eliminate the causes of various problems caused by misalignment. In addition, since the center part is tightened with a fastening metal fitting, cracks that occur during operation can be confined to the center part as much as possible, and at least the occurrence of cracks penetrating the outer periphery can be suppressed.
Air can be prevented from being entrained in the molten metal flow. Furthermore, since the sliding surface can be easily handled during grinding work, the surface accuracy can be further improved.

[Brief explanation of the drawing]

Figure 1 (al, (bl) is a schematic plan view and A-A line sectional view of a conventional insert type refractory, Figure 2 (a), (
b) is a schematic plan view of the plate refractory of the present invention, FIG. 3 is a schematic plan view of a conventional plate refractory, FIG. 4 is a schematic plan view of the plate refractory of the present invention, and FIG. 5 is a schematic plan view of a conventional plate refractory. A plan view of the plate refractory, FIG. 6 is a plan view of the plate refractory of the present invention, FIGS. 7, 8, 9, and 10 (a)
, (b) is a schematic sectional view showing another embodiment of the present invention. tl...Material with high corrosion resistance
2...Calcined refractory plate 3...Mortar
4... Molten metal discharge port 5... Central member 6
... Plate refractory 7 ... Thickness 8 ... Fastening metal fittings 10 ... 7-7'11 ... Ceramic Phino (-12 ... Stainless wire, wire mesh inventor Yoshibe Aiba inventor Toshiaki Maeda Inventor Kazuhide Kawai Applicant Agent Toshiba Ceramics Co., Ltd. Patent Attorney Theory Yujibe Figure 1 Figure 2 Figure 3 Figure 7/Figure 8/Figure 9 There is no change in the contents of the buttons in the drawings. Figure 10 (0) +5 (b) Procedures Supplementary +1 (written in Japanese) 19,1□157.+, August 20th, 11th Director-General of the Agency Kazuo Wakasugi 3 Name making the amendment], 'i' ! with [-Co Section Patent Applicant fi-”
l 1-26-2 Nishi-Shinjuku, Shinjuku-ku, Tokyo+'
c , : ” i' : (f; P+,) Toshiba Ceramics, Kusu Co., Ltd. 4 Agent (IIA) 11-1 Nihonbashi Honmachi, Chuo-ku, Tokyo bright number 7
Target of correction

Claims (1)

[Claims] (11# In a plate refractory made of multiple materials including a central member in contact with molten metal and an outer peripheral member surrounding the outer periphery, the peripheral side of the central member has a width equal to or less than the thickness of the plate refractory. A plate refractory for a sliding nozzle, characterized in that a fastening metal fitting having the following properties is fitted, and the outer circumferential member is made of a castable refractory material in which the central member is integrally cast together with the fastening metal fitting. (2 ) The plate refractory according to claim 1, characterized in that the fastening fitting is equipped with a mechanism for holding the castable refractory. (3) The plate refractory is reinforced with a hoop. Claims 1 and 2 that
Plate refractories as described in section. (4) Claim 1, characterized in that the hoop is provided with a mechanism for holding a castable refractory on the inner surface thereof.
A great refractory according to items 3 to 3. (5) The plate refractory according to any one of claims 1 to 4, characterized in that an inorganic fiber sheet is fitted between the central member and the outer peripheral member. (6) A plate refractory according to any one of claims 1 to 5, characterized in that a reinforcing metal member is embedded within the outer peripheral member of the castable refractory. (7) The plate refractory according to any one of claims 1 to 6, characterized in that a space is provided at least around the outer periphery of the fixing metal fitting to allow cooling gas to flow therethrough.