JPS60149883A - Manufacture of spray execution body incorporating refractoryfiber - 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 [Field of Industrial Application] The present invention relates to a method of manufacturing a thermal sprayed body used for repairing the inner surface of various molten metal containers, the outer surface of a member immersed in molten metal, and the like.

[Prior art]

Conventional methods for producing fireproof blocks include press molding, slip casting, and melt casting. Furthermore, as a method for repairing damaged parts such as furnace lining parts, blow-out repair using water-containing refractories has conventionally been carried out. However, all of the fireproof blocks manufactured by these manufacturing methods and the 1ili repair method have low durability.

Therefore, in recent years, thermal spraying has been increasingly applied to repair such injuries. In this method, refractory powder is flown into a combustion flame and melted and bonded to form a thermally sprayed molded body.

Since such thermal sprayed objects (including thermal spraying professional and 7-point thermal spraying repairs) are melt-formed at high temperatures, it is necessary to slowly cool them to prevent milling. However, since the structure of the thermally sprayed body is unified by the /8 fusion G of the refractory powder, when a wide area of the body is made by thermal spraying, shrinkage stress caused by cooling after the spraying is completed causes the inside of the thermally sprayed body to Shrinkage cracks occur.

This state is shown in FIG. As shown in the figure, when such a crack (2) occurs in a normal thermal sprayed body F1), there is no relaxation function for crack prevention, so the crack (2) advances inside the body (1), Eventually, the tissue will be destroyed and it will no longer be able to retain its original form.

Furthermore, JP-A No. 57-11878 discloses a technique of blending a metal wire coated with phosphate or silicate into an unshaped refractory material, and JP-A No. 56-73671 discloses a technique for adding a metal wire coated with phosphate or silicate to an unshaped refractory material. Rod-shaped material with heat resistance.

Techniques for compounding acicular or fibrous metals have been disclosed. It is believed that such metal wires can also prevent cracks occurring within the monolithic refractory material.

However, since all of them are manufactured simply by a normal firing method, they cannot have high density and high strength, and there is a limit to the improvement in durability.

[Purpose of the invention]

The present invention provides thermal spraying that has high density and high strength, can effectively prevent shrinkage cracks, improve spalling resistance, and significantly improve the durability of molten metal containers and molten metal immersion parts. The purpose is to provide a method for manufacturing a construction body.

[Structure of the invention]

The object of the present invention is to improve the spalling resistance of a thermally sprayed body by incorporating refractory fibers (oxides, non-oxides) into the molten structure of an integral structure obtained by thermal spraying.

The present invention will be explained in detail below.

The structure obtained by thermal spraying is an integrally fused structure made of refractory powder particles melted in a high-temperature flame. Therefore, it is possible to obtain a quality equivalent to dense and high-strength electroformed bricks than a molded body obtained by iM using a normal firing method or a constructed body obtained by a spraying method using a water-containing refractory.

However, generally when changing from a molten state to a solidified state,
Volume shrinks. At the time of contraction, cracks occur inside the construction body due to the generation of stress. In order to alleviate this shrinkage stress and prevent the construction object from falling off and becoming damaged even if it occurs, thermal spraying containing AQzOs-5iOz-based refractory fibers, carbon fibers, and stainless steel fibers is used in the molten structure. IM the two bodies.

Diarrhea hi containing fibres, as shown in Figure 2! The structure of the i construction body is shown. What is shown in the figure is 1.0 to 2. OLI+1 diameter length 10-30 mm 1
11i + fire fiber (4) are mixed. When the thermal spraying is completed and cooling begins, cracks (5) occur in the molten structure (3), but the presence of the refractory fibers (4) makes it possible to prevent the crack from progressing (i13).

Next, a construction method for obtaining the above-mentioned fiber-containing/8-layered upper body will be explained.

[First construction method] In this second method, as shown in Figure 3, the refractory powder is
This is a thermal spraying method in which a refractory fiber ejection nozzle (7) is installed near the /8AJ burner (6) for heating, and the refractory fiber (8) is thermally sprayed while adhering to the molten structure.

In FIG. 3, LPG =4ONrrr/llr,
02=20ONn? A refractory fiber injection nostle (7) is installed in the thermal spray burner (6) to obtain a high temperature flame under combustion conditions of /Ilr.
) are linked by link ＼-00).

Eight Q, 403-3i02 (M
z 03 = 90%, 5i02 = lO%) system refractory powder (particle size 10 μ to 200 μ) is passed through the target No. 1
- forming a molten layer (12) of refractory powder on the brick (I);

While moving the thermal spray burner (6) to the right side, the refractory fiber (8) is spouted from the refractory fiber spouting nozzle (7), and the mountain 1j
The pyrotechnic powder is attached to the surface of the molten layer (12). Solvent＼-
When moving the knife (6) to the left side, the refractory fiber spout G
Then, the process is stopped and only the molten layer (12) is deposited. below,
The refractory fibers are mixed in the melted structure by repeating the right-left motion.

[Second construction method] This construction method is a case where the flame spraying method containing fireproof fibers according to the present invention is applied to a cylindrical refractory. Specifically, as shown in FIG. 4, thermal spraying on damaged parts of lances for injecting various kinds of bodies into molten metal will be described.

Conventionally, such lances for powder injection are manufactured by castable casting, and are put into practical use after being dried. Crack propagation occurs due to immersion in high-temperature molten metal, rapid heating by pulling up, and rapid cooling, and the cracked portion is pre-emptively eroded. In addition, at the slag interface, pasozing repair has been adopted using slag flow, but the surface of the catable is vitrified due to slag penetration, and the adhesion with the patching hole is insufficient, so the repair effect is extremely small.

This construction method effectively repairs locally damaged cylindrical lances by wrapping refractory fibers around them and spraying them without rotating the lances.

The construction method of Kempo will be explained below with reference to FIG. The lance (15) where the slug line part (14) has been locally melted
) is wrapped with refractory fibers (16) in advance (). During construction, the lance (15) is rotated by the lance rotation drive motor (17) via the lance rotation mechanism (I8). Simultaneously with the rotation, the thermal spray burner ( 19) The refractory powder is melted and deposited.

The refractory fiber (16) is sent out by the device (20) synchronized with the rotation of the lance (15), and the refractory fiber (16) is fed out into the refractory powder molten layer (21).
).

The cross section of the lance (15) constructed in this way is as shown in FIG. After thermal spraying, cracks (22) will occur, but the cracks can be prevented from progressing by the fireproof fibers (16).
Moreover, it is possible to prevent it from falling off. This further improves the effect of repairing the damaged area.

〔Effect of the invention〕

As described above, in the present invention, since fire-resistant fibers are contained in the dense and high-strength thermal sprayed repair layer, the occurrence or growth of cracks can be prevented as much as possible, and the durability of the molten metal container can be improved. can be improved.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the structure of a thermal sprayed body manufactured by a conventional thermal spraying method, Fig. 2 is an explanatory diagram of the structure of a solvent-coated body according to the present invention, and Fig. 3 is a first construction method of the manufacturing method according to the present invention. FIG. 4 is an explanatory diagram of the construction state of the second construction method, and FIG. 5 is a W1 side view of the lance after construction. In the figure, (1): Thermal sprayed body (2): Cracks (31: /g melted refractory powder unstructured (4): Refractory fiber (5
): Crack (6): Thermal spray burner (7): Refractory fiber ejection nostle (8): Fireproof paper ♀IL (91: High temperature frame 00): Interlocking bar (II): Target brick (12): Refractory 4'5 ) Powder (12): IiJ Refractory Powder/8 Melt (15): Lance (16): Refractory Fiber (17)
Two-lance rotation drive motor (18): Lance rotation mechanism (19): /8-shot burner (20): Refractory fiber delivery device (21): Refractory powder fused layer (22): Crack agent Masu Tegori (etc.) 1 person)

Claims (1)

[Claims] 1. While spraying refractory powder from a thermal spray burner, the spraying simultaneously supplies refractory fibers to the surface, or
A method for producing a thermally sprayed body containing refractory fibers, characterized by alternately performing thermal spraying of refractory powder and supplying refractory fibers. 2. The refractory fiber is a short fiber with a length of 50 ms or less,
2. The method for producing a thermally sprayed body containing refractory fibers according to claim 1, wherein the short fibers are ejected from a nozzle and sprayed onto a surface. 3. The refractory fiber is a long fiber, and the long fiber is continuously fed by a feeding device, and the long fiber is wound around the thermal spraying object while rotating the thermal spraying object. A method for producing a thermal sprayed body incorporating the refractory fiber according to Scope 1.