JPH0339240Y2 - - Google Patents

Description

[Detailed explanation of the idea]

(Field of Industrial Application) The present invention relates to a ceramic tile that is used by being attached to the surface of a base material with a bonding agent in order to improve the heat resistance, corrosion resistance, abrasion resistance, etc. of the base material. (Prior Art) For example, metal impellers of pumps that convey slurry liquid, etc., are exposed to severe wear and corrosion depending on usage conditions. For this reason, the life of the base material is increased by lining the surface of the base material with alumina-based or zirconia-based ceramic tiles that have excellent heat resistance, corrosion resistance, and wear resistance.
Various bonding agents such as cement, mortar, organic adhesives, and metal bonding agents are used to fix these ceramic tiles to the base material surface, but conventional ceramic tiles cannot be bonded to the base material. The force is not sufficient, and attempts have been made to improve the anchoring effect of the bonding agent by mechanically roughening the bonding surface, but this has the disadvantage that it easily peels off when the base material deforms due to thermal expansion, etc. Ta. (Problems that the invention attempts to solve) This invention solves these conventional problems,
The bonding force to the base material can be significantly increased,
It was completed with the aim of producing ceramic tiles that would not easily peel off even if the base material was deformed. (Means for Solving the Problems) The present invention is characterized by having a multilayer structure in which a first preform with a through hole and a second preform without a through hole are joined. It is. (Embodiment) Next, the present invention will be explained in more detail with reference to the illustrated embodiment. In the first embodiment shown in FIGS. 1 and 2, 1 is made of ceramic material such as partially stabilized zirconia. 2 is a second preform also made of ceramic. The first preform 1 has an appropriate number of through holes 3 as shown in the figure, and in this embodiment, the through holes 3 have a small opening diameter on the side of the joint surface 4 with the base material, and The opening diameter on the joint surface side with the second preform 2 is large and is a tapered hole.
Further, the second preform 2 is a flat plate without a through hole, and the first and second preforms 1 and 2 are molded into a predetermined shape in advance by a compression molding method or a slip cast method, Integrated joint. To manufacture a ceramic tile with such a multilayer structure, unfired preforms 1 and 2 are laminated with the same ceramic tile powder or slip thereof interposed on the joint surface 5, and then fired and integrated. A method of pre-firing each preform 1 and 2 and then applying a glassy glaze to the joint surface 5 and firing to integrate the joint, or a method of metalizing the joint surface 5 of one or both preforms. , a method of bonding and integrating using a metallized layer, etc. Note that it is necessary that the first preform 1 and the second preform 2 have the same coefficient of thermal expansion.
The materials do not necessarily have to be the same as long as the coefficients of thermal expansion are the same; the first preform 1 on the base material side is made of an inexpensive material, and the second preform 2 on the surface side is made of a material with characteristics such as wear resistance. be able to excel in Next, in the second embodiment shown in FIGS. 3 and 4, the through hole 3 of the first preform 1 is a straight hole, and the second preform 2 is connected to the first preform 1. A recess 6 having a larger diameter than the through hole 3 is formed in the surface 5, and as shown in FIG. 3, the through hole 3 and the recess 6 form a stepped hole whose inside is expanded. be. (Function) As shown in FIG. 5, the device configured as described above is used by being attached to the surface of a metal base material 7 such as an impeller with a bonding agent, as is the case with conventional devices. Since the ceramic tile of the present invention has a multilayer structure in which a first preform 1 and a second preform 2 having through holes 3 are bonded, the bonding agent is applied to the through holes 3 of the first preform 1. It penetrates deeply into the interior and solidifies, creating a strong anchor effect. In addition, since these through holes 3 are independent from each other, even if the base material 7 is deformed due to thermal expansion or the like and the bonding agent in any of the through holes 3 peels off, the effect will be limited to the whole. It will never reach. Moreover, since the tile surface is made up of the second preform 2 without through holes 3, the base material surface has corrosion resistance, heat resistance,
A smooth surface with excellent wear resistance is formed. Furthermore, since the ceramic tile of the present invention is formed by joining the first and second preforms 1 and 2, the shape of the recess formed between them can be easily widened and expanded as shown in the example. It is possible to obtain extremely excellent bonding strength. In order to evaluate the bonding strength of the ceramic tile of the present invention, the following experiment was conducted. First, the first preform 1 and the second preform 2 shown in the first example were molded by compression molding partially stabilized zirconia powder at a pressure of 1500 kg/cm ² . All dimensions are 30mm x 40mm x
The first preform 1 has an opening diameter of 3 mm on the joint surface 4 side and an opening diameter of 5 mm on the joint surface 5 side.
Six through holes 3 were formed in advance. After firing these at 1500°C for 4 hours, they were joined together using a lead glass frit and fired at 750°C for 2 hours to obtain the ceramic tile shown in FIG. This ceramic tile was attached to the surface of a bonding member 10 made of SS41 material whose surface had been sandblasted using an organic adhesive 11 commercially available from Sumitomo 3M Company under the product number SW2214-HT. There are two types of adhesive thickness: 0.5 mm and 1 mm, and the adhesive area is 25 mm x 28 mm in both cases. As shown in Fig. 6, the ceramic tile is placed on a U-shaped pedestal 12, and the peel strength is determined by pressing only the ceramic tile downward with an inverted U-shaped pressing tool 13 (based on ASTM C321). was evaluated. In addition, a conventional product with a smooth bonding surface 4 was manufactured along with these, and its peel strength was evaluated using the same method. The results are shown in Table 1.

[Table] Next, the first preform 1 and the second preform 2 shown in the second example were molded by a slip cast method using partially stabilized zirconia powder. The through hole 3 of the first preform 1 has an inner diameter of 3 mm.
It is a straight hole with a plate thickness of 2.3mm, and the second
The recess 6 of the preform 2 has an inner diameter of 6 mm and a depth of 1.2 mm.
mm, and the remaining wall thickness was 0.8 mm. These were joined using partially stabilized zirconia slips as a binding material, and fired at 1500°C for 4 hours. When the obtained ceramic tiles were subjected to a peel strength test in the same manner as described above, the results shown in Table 2 were obtained.

[Table] (Effects of the invention) As is clear from the above explanation, the present invention can significantly increase the bonding force to the base material, and will not peel off even when the base material is deformed due to thermal expansion, etc. It is suitable for forming a strong lining layer with excellent heat resistance, corrosion resistance, and wear resistance on the surface of the base material. In addition, since the ceramic tile of this invention is made by joining two preforms,
In addition to being able to easily form a deep-spreading recess on the joint surface with the base material, the second preform in the surface layer is designed with emphasis on properties such as heat resistance, and the first preform Free combinations, such as ones with emphasis on characteristics, are also possible. Therefore, the present invention has extremely great practical value as it solves the problems of conventional ceramic tiles of this type.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway perspective view showing the first embodiment of the present invention, FIG. 2 is an exploded perspective view thereof, and FIG. 3 is a second embodiment of the present invention.
FIG. 4 is an exploded perspective view of the embodiment, FIG. 5 is a partially cutaway perspective view showing an example of a usage state, and FIG. 6 is a perspective view of a peel strength measuring device. DESCRIPTION OF SYMBOLS 1...First preform, 2...Second preform, 3...Through hole, 6...Recessed part.

Claims (1)

[Claims for Utility Model Registration] 1. A first preform 1 with a through hole 3 provided therethrough.
A ceramic tile characterized by having a multilayer structure in which a preform 2 and a second preform 2 without a through hole 3 are joined. 2. The ceramic tile according to claim 1, wherein the through hole 3 is a tapered hole. 3 Utility model registration claim 1 in which the through hole 3 is a straight hole and the second preform 2 is provided with a recess 6 having a larger diameter than the through hole 3.
Ceramic tile as described in section.