JPS6138796B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for lining molten metal containers, such as tundishes and ladles. When lining a molten metal container with refractory clay using a sprayed refractory powder lining, the sprayed powder adheres to areas other than the intended construction site. However, if a thermal spray lining is further applied on top of the refractory powder that has adhered due to the scattering of the lever, the adhesive force of the refractory powder that has adhered due to the scattering to the base brick is weak, causing the thermal spray lining to peel off. An object of the present invention is to apply a sprayed layer of refractory powder to the surface of a permanent lining such as a lining brick of a molten metal container by applying the sprayed layer on the refractory powder that has been scattered and adhered by thermal spraying. The purpose of this paper is to provide a lining method that can solve the problem of layer peeling. First, a refractory spray layer is intermittently sprayed so that it is formed on the lining portion of the refractory brick to which scattered refractory particles are not attached due to the spraying, and then the molten metal is received and discharged. A method for lining a molten metal container, characterized in that a sprayed layer of refractory is applied to the intermittent portions of the refractory brick that are sprayed. That is, in the present invention, a thermal spray layer is intermittently applied to the permanent lining of a molten metal container to which no particles scattered by thermal spraying have adhered, and the molten metal is poured into the container to remove the particles that have adhered to the molten metal. After the scattered adhering particles have been removed, a thermal spray layer is applied to the intermittent portions of the final thermal spraying, and is formed integrally with the initially formed thermal spray layer. Note that the scattered adhered particles are not completely removed by receiving the molten metal, but the remaining adhered particles are
Adhesive strength is improved by a high temperature chemical reaction with the base material, the refractory brick, due to the heat of the molten metal.
No peeling of the sprayed layer occurs. Figure 1 shows an embodiment of the present invention, in which A shows the state at the time of first spraying layer construction, and B shows 1.
The state after receiving the charge is shown, and C shows the state after the construction of the thermal spray layer on the intermittent thermal spraying part. In the figure, 1 is a refractory brick, 2 is a thermally sprayed layer, 3 is a scattered adhering particle, and 4 is a thermally sprayed layer applied to the intermittent areas of the bottom thermal spraying. The present invention will be explained based on examples. EXAMPLE The method of the present invention and the conventional method were applied to a 170 Ton ladle with a 65 mm permanent lining. First, according to the present invention, the first row of refractory sprayed layer is applied on the permanent lining with a thickness of 40 mm in an area of 350 mm in width, and then the third row is applied 350 mm above the first row, and A sprayed layer with a thickness of 40 mm was formed over a range of 350 mm. Thereafter, a thermal spray layer of the same thickness was applied to each row over a width of 350 mm. By applying one charge to the thus constructed ladle, the scattered particles adhering to the bottom sprayed area were melted and removed, and then a 40 mm thick molten layer was applied to each row of the bottom sprayed area. This completed the one-piece structure of the refractory sprayed layer. On the other hand, according to the conventional method, the sprayed layer in the first row was
It was formed to a thickness of mm, and then thermal sprayed layers were sequentially formed in the second and third rows to form an integrated structure. As shown in Table 1, according to the present invention, the adhesive strength between the thermal sprayed layer and the permanent lining material is 70Kg/cm ² to 100Kg/cm ² , whereas the adhesive strength of the conventional method is that the adhesive strength is 70Kg/cm 2 to 100Kg/cm 2 . 1-5 due to powder adhesion
As low as Kg/ ^cm2 . Therefore, in terms of service life, the ladle produced by the method of the present invention has a service life of 30 charges, while the ladle produced by the conventional method suffers from peeling and wear after 5 charges. 【table】

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing an embodiment of the present invention. 1: Refractory brick, 2: Thermal spray layer, 3: Scattering adhering particles, 4: Thermal spray layer on intermittent parts.

Claims (1)

[Claims] 1. When lining a molten metal container made of an iron skin lined with refractory bricks with a sprayed refractory layer, the sprayed refractory layer is first applied to the interior of the refractory bricks to which the sprayed refractory particles have not adhered. A molten metal container characterized in that, after the molten metal is intermittently sprayed so as to be formed on the refractory parts, the molten metal is received and discharged, and then a sprayed layer of refractory is applied to the intermittently sprayed parts of the refractory brick. lining method.