Coating liquid, composition for coating liquid, and refractory article having coating layer

Abstract

Provided are: a coating liquid for refractory articles, which has excellent performance and which can be prepared through a simple operation; a composition for producing the coating liquid; and a refractory article with a coating layer having excellent thermal insulation performance and resistance against strong wind. The coating liquid contains 100 parts by mass of water, 10-20 parts by mass of an inorganic binder, 0.2-2 parts by mass of a swellable clay mineral, and 10-200 parts by mass of a radial-scattering material. The radial-scattering material contains: a ceramic fiber which comprisesfibrous particles containing Al2O3 and has an average fiber length of 100 [mu]m or less; and / or one or more ceramic powders which are selected from the group consisting of alumina powder, silica powder, titania powder, chromia powder, yttria powder, zirconia powder, lanthanum oxide powder, ceria powder, silicon carbide powder, silicon carbide aluminum powder, silicon nitride powder, and boron nitride powder, and have a median size of 60 [mu]m or less.

Description

Technical field

[0001] The present invention relates to a coating liquid for coating a refractory material, a composition for preparing the coating liquid, and a refractory material having a coating layer prepared using the coating liquid. Background technique

[0002] The soaking furnace used in the manufacture of steel materials, heat treatment furnaces, and the firing furnace used in the manufacture of ceramics and the like are configured such that a heating furnace capable of heating at high temperatures has an outer wall and an inner wall arranged inside the outer wall. The inner wall is made of refractory material.

[0003] The refractory material constituting the inner wall is usually installed on the outer wall of the heating furnace through installation fittings. As such a refractory material, a block composed of ceramic fibers containing silica, alumina, zirconia, etc. is often used. Since this block has excellent heat insulation performance, it is possible to easily co...

Examples

Embodiment

[0097] Hereinafter, examples of the above-mentioned coating liquid will be described. In addition, in this example, the following materials were used to prepare the coating liquid.

[0098] ·Inorganic binder comes from colloidal silica particles

[0099] ·Swelling clay mineral montmorillonite

[0100] ·Ceramic Fiber A Al 2 O 3 Content: 65% by mass, SiO 2 Content: 35% by mass, average diameter of fibrous particles: 6μm, average fiber length: 10μm

[0101] ·Ceramic fiber B Al 2 O 3 Content: 65% by mass, SiO 2 Content: 35% by mass, average diameter of fibrous particles: 6μm, average fiber length: 20μm

[0102] ·Ceramic fiber C Al 2 O 3 Content: 65% by mass, SiO 2 Content: 35% by mass, average diameter of fibrous particles: 6μm, average fiber length: 40μm

[0103] ·Ceramic fiber D Al 2 O 3 Content: 65% by mass, SiO 2 Content: 35% by mass, average diameter of fibrous particles: 6μm, average fiber length: 60μm

[0104] ·Ceramic Fiber E Al 2 O 3 Content: 65% by mass, SiO 2 Content: 35% by mass,...

experiment example 1

[0121] This example is an example of a coating liquid containing a ceramic fiber as a radiation scattering material. In this example, as shown in Table 1, the types and contents of ceramic fibers were changed to prepare 14 kinds of coating liquids (test agents 1-14). After that, the characteristics of the obtained coating liquid were evaluated.

[0122]

[0123] First, while stirring the water, the swelling clay mineral is added several times to disperse the swelling clay mineral in the water. While stirring the solution, an inorganic binder, a radiation scattering material, a coloring agent, a preservative, and a thickening agent were sequentially added to prepare test agents 1-14. In addition, the inorganic binder is mixed with the above-mentioned solution in the state of a colloidal silica solution.

[0124]

[0125] ·Viscosity

[0126] The viscosity of each test agent at 20°C was measured using a viscometer ("Viscotester VT-04E" manufactured by RION Corporation). The results ...

experiment example 2

[0181] This example is an example of a coating liquid in which the contents of the inorganic binder and the swellable clay mineral are changed. As shown in Table 2, in this example, 8 kinds of coating liquids (test agents 15-22) in which the contents of the inorganic binder and the swellable clay mineral were changed were prepared in the same manner as in Experimental Example 1. Then, various characteristics were evaluated by the same method as in Experimental Example 1. The results are shown in Table 2.

[0182] Table 2

[0183]

Technical field

[0001] The present invention relates to a coating liquid for coating a refractory material, a composition for preparing the coating liquid, and a refractory material having a coating layer prepared using the coating liquid. Background technique

[0002] The soaking furnace used in the manufacture of steel materials, heat treatment furnaces, and the firing furnace used in the manufacture of ceramics and the like are configured such that a heating furnace capable of heating at high temperatures has an outer wall and an inner wall arranged inside the outer wall. The inner wall is made of refractory material.

[0003] The refractory material constituting the inner wall is usually installed on the outer wall of the heating furnace through installation fittings. As such a refractory material, a block composed of ceramic fibers containing silica, alumina, zirconia, etc. is often used. Since this block has excellent heat insulation performance, it is possible to easily co...

Examples

Embodiment

[0097] Hereinafter, examples of the above-mentioned coating liquid will be described. In addition, in this example, the following materials were used to prepare the coating liquid.

[0098] ·Inorganic binder comes from colloidal silica particles

[0099] ·Swelling clay mineral montmorillonite

[0100] ·Ceramic Fiber A Al 2 O 3 Content: 65% by mass, SiO 2 Content: 35% by mass, average diameter of fibrous particles: 6μm, average fiber length: 10μm

[0101] ·Ceramic fiber B Al 2 O 3 Content: 65% by mass, SiO 2 Content: 35% by mass, average diameter of fibrous particles: 6μm, average fiber length: 20μm

[0102] ·Ceramic fiber C Al 2 O 3 Content: 65% by mass, SiO 2 Content: 35% by mass, average diameter of fibrous particles: 6μm, average fiber length: 40μm

[0103] ·Ceramic fiber D Al 2 O 3 Content: 65% by mass, SiO 2 Content: 35% by mass, average diameter of fibrous particles: 6μm, average fiber length: 60μm

[0104] ·Ceramic Fiber E Al 2 O 3 Content: 65% by mass, SiO 2 Content: 35% by mass,...

experiment example 1

[0121] This example is an example of a coating liquid containing a ceramic fiber as a radiation scattering material. In this example, as shown in Table 1, the types and contents of ceramic fibers were changed to prepare 14 kinds of coating liquids (test agents 1-14). After that, the characteristics of the obtained coating liquid were evaluated.

[0122]

[0123] First, while stirring the water, the swelling clay mineral is added several times to disperse the swelling clay mineral in the water. While stirring the solution, an inorganic binder, a radiation scattering material, a coloring agent, a preservative, and a thickening agent were sequentially added to prepare test agents 1-14. In addition, the inorganic binder is mixed with the above-mentioned solution in the state of a colloidal silica solution.

[0124]

[0125] ·Viscosity

[0126] The viscosity of each test agent at 20°C was measured using a viscometer ("Viscotester VT-04E" manufactured by RION Corporation). The results ...

experiment example 2

[0181] This example is an example of a coating liquid in which the contents of the inorganic binder and the swellable clay mineral are changed. As shown in Table 2, in this example, 8 kinds of coating liquids (test agents 15-22) in which the contents of the inorganic binder and the swellable clay mineral were changed were prepared in the same manner as in Experimental Example 1. Then, various characteristics were evaluated by the same method as in Experimental Example 1. The results are shown in Table 2.

[0182] Table 2

[0183]

Images