JPH057345B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Field of Application] The present invention relates to a long ceramic plate made of a large-sized hollow molded body that is easy to install, has high dimensional accuracy and excellent workability, and is used for the interior and exterior of buildings. [Prior Art] Tiles have been known since ancient times as ceramic boards for construction. Since ceramics are subject to large deformations during firing, they have been used as small tiles to compensate for the lack of precision through joints. In recent years, large thin ceramic boards using wollastonite have been manufactured, some measuring 1000 x 2000 x 5 mm, and are used for construction purposes, but with conventional pasting methods, it is difficult to paste the entire surface uniformly. It was difficult to attach, and because it was a large board, care had to be taken to prevent cracks from forming due to the difference in expansion and contraction with the base. In addition, it was impossible to use it without attaching it to a base because it was thin and lacked its own strength. The manufacturing method for long ceramic plates is disclosed in JP-A-61-36160 and JP-A-Sho.
61-44752, JP 61-44753, JP 61-44754,
JP-A-62-21746, JP-A-62-21747, JP-A-62-
21748, disclosed in Japanese Patent Application Laid-Open No. 62-21749. These methods involve continuous extrusion molding of clay-based materials to which shamots have been added without cutting from molding to firing, and then cutting after firing. Since these materials are mainly made of viscosity, they are subject to large deformations and must be constructed as continuous plants. For this reason, it is not possible to operate the extrusion, drying, and baking equipment under efficient conditions, resulting in inefficiency, and it is not possible to avoid warping of 5 mm or more per 1 meter length, resulting in poor workability. . On the other hand, a ceramic sintered body with excellent machinability is disclosed in JP-A-60-186463, but since a large amount of highly oriented raw material is used, deformation during drying and sintering is large, and sufficient accuracy is required. I couldn't get it out. [Problems to be solved by the invention] Conventional large tiles have no bending strength because they are thin.
It was necessary to attach it to other parts. Also, large tiles are difficult to stick evenly, and because they are large, they are prone to cracking due to differences in expansion and contraction with the base. On the other hand, in order to increase the bending strength and eliminate the need to attach it to other members, if it is made thicker, it will take more time to fire, and cracks will occur due to the difference in firing shrinkage between the inside and the surface. Ceramic plates made primarily of viscous material were subject to large deformations due to orientation during extrusion molding, had poor workability, and did not have sufficient dimensional accuracy. The present invention was developed to solve the above-mentioned drawbacks of the conventional technology, such as the problem of construction methods when using thin plates, and deformation when making thick plates, making it impossible to produce large plates with good precision. It is what was done. [Means for Solving the Problems] In order to solve these problems, the present inventors continued intensive research on the selection of raw materials, their compounding composition, and the shape of molded products.As a result, wollastonite was developed. : 10 to 50 parts by weight Clays: 20 to 40 parts by weight Talc: 10 to 20 parts by weight A molded body made of a composition consisting of 10 to 40 parts by weight of slag if necessary, and has a wall thickness of 4 to 40 parts by weight. The sintered long ceramic plate is a 15 mm hollow extrusion molded body, and is easy to install.
It was found that it is a construction material with excellent dimensional accuracy, and has good dimensional accuracy, durability, aesthetics, and workability. [Function] The ceramic board of the present invention is an extrusion-molded hollow board that can be used for interior and exterior construction. expensive. Even easier to install,
It is highly workable. When wollastonite is used, the ceramic plate can be fired in a short time and sintering does not proceed. Therefore, a product with little deformation and high dimensional accuracy can be obtained. If the amount of wollastonite mixed is less than 10 parts by weight, processability will be poor, and if it exceeds 50 parts by weight, wollastonite will be acicular crystals and will be oriented during extrusion molding, and due to anisotropy of shrinkage, it will be difficult to process during drying and firing. This has the disadvantage that not only the deformation becomes large, but also the vertical and horizontal strength ratio becomes large. The clay imparts plasticity during extrusion molding and improves sinterability, and we use Frogme clay and Kibushi clay. If the clay content is less than 20 parts by weight, moldability will be poor, and if it exceeds 40 parts by weight, shrinkage will increase and deformation will increase, so it is not acceptable. Talc is used as a lubricant during extrusion molding, and is preferably in the range of 10 to 20 parts by weight. Ten
If it is less than 20 parts by weight, moldability will be poor, and if it exceeds 20 parts by weight, the amount of shrinkage during firing will increase and deformation will increase, so it must be avoided. The method for manufacturing the ceramic plate of the present invention is as follows. Water is added to the composition as described above and kneaded. This is extruded, dried and fired, and then ground to improve dimensional accuracy. At this time, if wollastonite is present in an amount of 10 parts by weight or more, workability is good and grinding is easy. After glazing, firing is performed at a lower temperature than the previous firing temperature. When considering firing and attachment during use, it is desirable that the extrusion molding be formed into a hollow shape with a wall thickness of 4 to 15 mm. By making it hollow, it becomes a material that is easy to fire and has a strong bending strength, and when used, the hollow part can be used to perform construction without protruding mounting hardware from the surface. It is preferable to use a roller hearth kiln for firing, which allows rapid firing. Wall thickness is 4mm
If it is less than 1, the relatively large molded article that is the problem of the present invention will sag due to gravity, making it impossible to maintain dimensional accuracy. Also, if the wall thickness exceeds 15 mm, only the surface will be fired during rapid firing, and surface shrinkage will cause
It is unsuitable because it will cause cracks. Also, by adding slag to the above composition, a more suitable and economical product can be obtained. Since slag has already undergone a melting process,
The amount of heat required for firing is small, the firing speed can be increased, it is highly economical, and raw material costs can be reduced. Blast furnace slag, electric furnace slag, Kyupora furnace slag, etc. can be used as the slag. If it is less than 10 parts by weight, the effect of slag inclusion will be small, while if it is added in a large amount, workability will decrease and grinding will become difficult, so it is not preferable to exceed 40 parts by weight. [Effects of the Invention] A long ceramic plate made of a hollow extrusion molded product of the present invention can be long and wide.
In addition, it has high dimensional accuracy, high strength, easy drilling and construction, excellent weather resistance, and when used as interior and exterior walls of buildings, it has excellent effects such as being lightweight and aesthetically pleasing. [Example] Example 1 Clay was prepared according to the formulation shown in Table 1, mixed with water, and then kneaded using an extrusion molding machine, as shown in Fig. 1. Width W = 300 mm Length L = 2000 mm Thickness T = 50 mm Extrusion molding was performed on a hollow perforated plate with wall thickness t = 10 mm. It was dried using a far-infrared lamp, heated to 1100°C in a roller hearth kiln for 100 minutes, passed through a firing zone at 1100°C for 20 minutes, and cooled to room temperature for 60 minutes. We investigated the amount of deformation, ground it, and examined the grindability, as well as achieved linearity and improved dimensional accuracy. It was then glazed, heated to 1050°C in 50 minutes in a roller hearth kiln, passed through a firing zone at 1050°C for 10 minutes, and cooled to room temperature in 30 minutes. Table 1 shows extrudability, longitudinal deformation (warpage),
The results of examining grindability and bending strength are listed. In Experiments No. 7 and No. 11, extrusion molding was not possible and test specimens could not be made. Examples No. 2 to No. 5 and No. 2 having the component composition of the present invention.
No. 8 to No. 9 and No. 12 have shown good results, but No. 1, which has less wollastonite, has inferior grindability and strength.
No. 6 with excessive wollastonite improves grindability, but the amount of deformation becomes excessive. No.10 with the highest amount of talc
The amount of deformation is large and the grindability is poor. High viscosity No.
13 has large deformation.

【table】

[Table] Example 2 The size of the hole 2 of the long ceramic plate 1 shown in Fig. 1 with the composition No. 3 in Table 1, width W = 300 mm, length L = 2000 mm, thickness T = 50 mm. Extrusion molding as shown in Table 2 was carried out while varying a x b and wall thickness t. The results of dry firing and investigation of the time required for no cracks to occur are shown. Wall thickness is 50mm (solid plate), 20mm
No.14 and No.15 require a long time to fire, and the wall thickness t is 10
mm, No. 16 and No. 17 of 8 mm are easy to fire.

【table】 [Brief explanation of drawings]

FIG. 1 is a partial perspective view of an embodiment of the invention. 1... Long ceramic plate, 2... Hole.

Claims (1)

[Claims] 1. A long ceramic plate characterized in that it is a hollow extrusion-molded sintered body comprising 10 to 50 parts by weight of wollastonite, 20 to 40 parts by weight of clay, and 10 to 20 parts by weight of talc. . 2. The long ceramic plate according to claim 1, wherein the hollow extruded body has a wall thickness of 4 to 15 mm. 3 Long ceramics characterized by being a hollow extrusion sintered body consisting of wollastonite: 10 to 50 parts by weight Clay: 20 to 40 parts by weight Talc: 10 to 20 parts by weight Slag: 10 to 40 parts by weight Board. 4. The long ceramic plate according to claim 3, wherein the hollow extruded body has a wall thickness of 4 to 15 mm.