JPH075395B2 - Method for manufacturing glazed foam ceramic product - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a manufacturing method for obtaining a glazed product which is made of a foamed ceramic material and is lightweight and has excellent heat insulating properties.

[Conventional technology]

Usually, in order to obtain a product that is lightweight and has excellent heat insulating properties using a foam material, the foam material is foamed in a molding die and then demolded to obtain a product having a desired shape.

Further, the foamed material is extruded by an extruder and foamed to obtain a foamed molded body, and then the foamed molded body is cut into a predetermined shape to obtain a foamed product having a desired shape.

In addition, when forming a glaze surface on such a foamed product, it was necessary to mold the foamed product, apply the glaze, and then bake the entire product to obtain the final product.

[Problems to be Solved by the Invention]

However, when foaming a foamed material in a molding die, it is necessary to prepare a molding die for each size and shape of the product, which requires time and labor for setup change and has a drawback that the equipment cost also rises. . Moreover, in the case of forming a glaze surface on such a foamed material, in any case, after molding the foamed molded body once, glazing is performed, the whole is baked to vitrify the glaze, and the foamed material and the glaze are mixed. It is necessary to integrate them. In short, at least the step of molding the foamed molded article and the step of glazing and firing the foamed molded article are required, and these must be performed separately. Therefore, there are drawbacks in that the number of steps is complicated, troublesome, and takes a long time, resulting in poor productivity.

When a glass material is used as the foam material, the release agent applied to the surface of the mold sticks to the surface of the foam material, making it impossible to apply the glaze raw material to the surface of the foam molded article. That is, it was not possible to obtain a product having a glaze surface with a glassy foam material.

[Means for Solving the Problems]

SUMMARY OF THE INVENTION The present invention has been made by improving and removing the above problem in view of the conventional problems described above, and it is an object of the present invention to provide a method for producing a glazed foamed ceramic product capable of simultaneously performing foam molding and glaze firing.

Thus, the means adopted by the present invention to solve the above-mentioned problems is that when the inorganic foam ceramic material is pressed, the back side of the molded body is foamed in the firing step performed after the pressing step. In order to compensate for the amount of expansion of the above, a predetermined concave portion is formed, and after the glaze is applied to the surface of the formed body, the whole is baked to foam.

[Work]

A predetermined concave portion is formed on the back surface side of the pressure-formed body of the inorganic foamed ceramic material to compensate for the expansion amount at the time of foaming in the firing step performed after the pressure step, and a glaze is applied to the surface of the pressure-formed body. When applied and fired, the inorganic foam ceramic material foams, and at the same time, the glaze vitrifies and bonds with the inorganic foam ceramic material.

〔Example〕

The method of the present invention will be described below with reference to the embodiments shown in the drawings.

1 to 4 show a manufacturing process according to an embodiment of the present invention. First, an inorganic foam ceramic material prepared by mixing a fine main material made of volcanic glassy mineral and a fine powdery foaming agent is prepared. The volcanic glassy mineral is one or several kinds of mine pyroxene, chordite, pearlite, black rock, shirasu, Ise silica sand, etc., which are finely ground and mixed by using a crusher and a mill. . The fine powdery foaming agent is a fine particle having an average particle diameter of 15 μm or less, which is made of one kind or several kinds of carbon, carbide such as silicon carbide, nitride such as silicon nitride and the like. Next, such an inorganic foamed ceramic material is pressed by a dry press machine or the like to obtain a pressure molded body 1 having a desired shape as shown in FIG. This pressure-molded body 1 has
Since the central portion of the glazed surface (upper surface) 1a of the pressure molded body 1 tends to bulge, the recess 2 is formed in advance on the back surface 1b side in anticipation of this bulging amount.

Then, as shown in FIG. 2, the surfaces 1a, 1c of the pressure molded body 1 are
Apply glaze to a tunnel furnace (not shown)
Baking is performed at a baking temperature of 1180 ° C. for 30 hours. By this firing, the inorganic foam ceramic material foams to form closed cells. Further, the glaze is vitrified at the same time as foaming and is integrated with the inorganic foam ceramic material. In the state where foaming is stable and cooled to room temperature, the surfaces 1a and 1c are substantially flat. This is because the force that the center side of the surface 1a swells during firing and foaming changes to the force that flattens the concave portion 2 formed in the surface 1b.

After that, the non-glazed surface of the fired body 3 thus obtained was cut with a diamond wheel or the like as shown in FIG. 3 and glazed in a desired shape as shown in FIG. A foam ceramic product 4 is obtained.

In such a glazed foamed ceramic product 4, innumerable closed cells confine air, prevent heat conduction, and exhibit excellent heat insulating properties. Further, since it is extremely lightweight and is entirely glassy, there is no risk of burning and no water absorption, so there is no risk of damage due to frost damage.

By the way, the present invention is not limited to the above-mentioned embodiment, and for example, the kind and the product shape of the glaze, the glazed surface and the like can be appropriately changed.

〔The invention's effect〕

As described above, according to the method of the present invention, since the glaze is applied to the surface of the pressure-molded body made of the inorganic foam ceramic material and then baked, the inorganic foam ceramic material is foamed and the glaze is vitrified to be an inorganic substance. The glazed surface can be formed integrally with the foam ceramic material.
Further, since the back surface side of the pressure molded body is molded into a predetermined concave portion, the force to bulge the central portion during firing and foaming is changed to the force to flatten the concave portion, so that a flat product can be obtained. You can

[Brief description of drawings]

The drawings are all related to one embodiment of the present invention. FIG. 1 is a side view showing a molded body of a foam ceramic material, and FIG.
FIG. 4 is a side view showing a glazed fired body of a foamed ceramic material, FIG. 3 is a side view showing a cut portion of the glazed fired body, and FIG. 4 is a side view showing a glazed foamed ceramic product. 1 …… Molded body of inorganic foam ceramic material 4 …… Glazed foam ceramic product

Claims (1)

[Claims] 1. In the step of pressing an inorganic foamed ceramic material, the back side of the molded body is molded into a predetermined concave portion so as to compensate the expansion amount at the time of foaming in the firing step performed after the pressing step, A method for producing a glazed foamed ceramic product, which comprises applying a glaze to the surface of the molded body and firing the entire body to foam.