JPH0859332A - Ready-mixture of pottery material - Google Patents

Abstract

PURPOSE: To obtain a ready-mixture capable of increasing the strength of a pottery product by using an aluminum compd. on a large sale unlike pure crystallized alumina. CONSTITUTION: This raw material formulation is obtained by admixing a pottery material such as feldspar and clay with an aggregate. In this case, the grain of an aluminum compd. is deposited on the aggregate grain or the aggregate is coated with the aluminum compd. Meanwhile, an aluminum compd. is further added to the ready-mixture obtained by admixing the pottery material such as feldspar and clay with the aggregate.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention adds an aluminum compound to a raw material for ceramics so as to make it aluminum-rich, so that a large amount of mullite, which is a needle-like crystal, is formed around the aggregate when it is fired. The present invention relates to a formulation of a raw material for ceramics, by which a product excellent in strength can be obtained by strengthening the bond with the matrix, which is a fine structure around the matrix.

[0002]

2. Description of the Related Art As a raw material for feldspar porcelain, those having a blending ratio disclosed in JP-B-53-28446 are usually used. The component ratio is a blending raw material having a basic blending composition of 15 to 30% of silica raw material (unit is weight percent, the same applies hereinafter), 20 to 40% of feldspar raw material, and 40 to 60% of clay raw material. The quartz material in this case is used as an aggregate. The porcelain composition after firing such an ordinary feldspar raw material for ceramics is 10 to 2
Quartz of 0% and mullite of 10 to 20% exist as a crystal phase, and a non-homogeneous glass phase except for quartz and mullite.

Thus, such a feldspar raw material for ceramics is
It is not suitable for products that have low mechanical strength and require high strength properties. Therefore, conventionally, pure alumina purified as a single crystal is added as an aggregate to the raw material of the above-mentioned basic composition for the purpose of reinforcing it, and the mixture is fired. FIG. 3 is a drawing showing a mixed state of the prepared raw material particles 1 having the basic composition and the aggregate particles 2 of alumina.

By adding alumina, a large number of mullite, which is a needle-like crystal, is formed around the alumina particles. Then, the mullite needle-like crystals chemically bond with the alumina particles to densify the structure, and as a result, exhibit excellent mechanical strength.

[0005]

However, the above-mentioned alumina needs to be separately manufactured as a single crystal by refining, which causes a problem that the manufacturing process is troublesome and a manufacturing cost is high. It was

[0006]

SUMMARY OF THE INVENTION The present invention has been made by improving and removing the conventional problems described above, and by using a mass-produced aluminum compound different from pure single crystal alumina, ceramics can be obtained. The purpose is to provide a formulation that can enhance the strength of the product.

The first means adopted by the present invention to solve the above problems is to prepare a raw material mixture obtained by adding aggregates to a raw material for porcelain such as feldspar, clay, etc. It is a formulation of a raw material for ceramics, characterized in that particles of an aluminum compound are attached to the periphery of aggregate particles or coated with an aluminum compound.

The second means adopted by the present invention is characterized in that an aluminum compound is newly added to a raw material mixture obtained by adding aggregate to a raw material for porcelain such as feldspar and clay. It is a mixture of raw materials for ceramics.

[0009]

According to the first means of the present invention, in a raw material composition obtained by adding an aggregate to a raw material for ceramics and mixing the raw material,
Aluminum compound particles are adhered to or coated on the surface of the aggregate particles. As the aluminum compound, mass sold products such as aluminum hydroxide and γ-alumina are used.

When a base material for ceramics is molded using such a raw material mixture and fired, the periphery of the aggregate particles becomes rich in aluminum, and mullite needle crystals are easily generated. The mullite needle-like crystals chemically bond with the aggregate particles to densify the structure, and thus the obtained product has excellent mechanical strength.

A second means of the present invention is to prepare a raw material for ceramics by adding an aluminum compound, which is a mass-produced product, to the raw material for ceramics. In such a raw material formulation, the periphery of the aggregate particles becomes rich in aluminum, and mullite needle-like crystals are generated, so that a product having excellent mechanical strength is also obtained.

In the second means, the aluminum compound, which is a mass-produced product, is simply added to the raw material for ceramics, and the aluminum compound is dispersed in feldspar, clay particles, or aggregate particles. Exists. Therefore, there is a problem that a large amount of aluminum compound is required to make the surroundings of the aggregate particles aluminum-rich. However, it is excellent in strength.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the present invention will be described below with reference to the embodiments shown in the drawings. The same reference numerals as in the conventional case are the same members. The present invention is based on a formulation having a basic composition which is usually used as a raw material for ceramics. As such a basic composition,
For example, there is one disclosed in the above-mentioned Japanese Patent Publication No. 53-28446. If the component ratio is re-transcribed here, 15 to 30% of the silica raw material as the aggregate (the unit is weight percent, the same hereinafter), 20 to 40% of the feldspar raw material as the raw material for the ceramics, and the clay as the raw material for the ceramics It is a blending raw material having a basic blending composition of 40 to 60% of quality raw material.

Thus, in the first embodiment of the first means of the present invention, as shown in FIG. 1, water is formed around the quartz particles 3 as the aggregate in the above basic composition. Fine particles of aluminum compound 4 such as aluminum oxide or γ-alumina are attached. Then, the silica aggregate particles 3 to which the aluminum compound 4 is adhered are mixed with the preparation raw material particles 1 having the above basic composition to prepare the mixture. It is also possible to use chamotte as the aggregate particles 3.

The mixing work is carried out by the aggregate particles 3 and the aluminum compound 4
The fine particles of are put into a mill, mixed, taken out and dried. Then, separately prepared feldspar and clay are added to this dry raw material, mixed again in a mill, shaped into a predetermined shape, and then fired at 1200 to 1300 ° C.

The following Table 1 shows 30% by weight of feldspar,
Clay is 40 wt% and the conventional case where alumina is used as the aggregate, feldspar is 30 wt% and clay is 40 wt% and the case where quartz and chamotte are used as the aggregate, and further, the bones of quartz and chamotte are used. It shows the experimental result comparing the bending strength of the ceramic products in the case of the present invention in which the aluminum compound is attached to the particle surface of the material. The experimental material is that the raw material having the above-mentioned mixing ratio is press-molded under a pressure of 100 MPa, and then fired at 1200 to 1300 ° C.
A test piece with a size of 0 mm × 15 mm × 5 mm is manufactured,
The bending strength was compared.

[0017]

[Table-1]

As is clear from Table 1, when alumina, which is a single crystal, is used as the aggregate, the bending strength is as high as 130 MPa, which is the most excellent. However, as described above, when this alumina is used, there is a problem to be solved by the present invention. The bending strength when using only quartz and chamotte as aggregates is 70M each.
Pa, which is inferior in strength.

On the other hand, in the case of the present invention using the aggregate to which the particles of the aluminum compound are attached, the bending strength is 90 MPa, and the bending strength is 20 MPa more than that of the conventional case using the same quartz and chamotte. It is clear that This is because by making the surroundings of the aggregate particles aluminum-rich, it was possible to promote the generation of mullite needle-like crystals that are binding crystals with the matrix.

The aluminum compound, as shown in FIG.
It is possible to obtain the same result as in the case of FIG. 1 by providing the coating 5 around the aggregate particles 3 of quartz or chamotte and adhering them.

In the present invention, although not shown, quartz or chamotte aggregate particles 3 are blended with the ceramic raw material 1 shown in FIGS. 1 and 2, and γ-alumina or aluminum hydroxide is further added. It is also possible to use a mixture obtained by simply adding particles of an aluminum compound such as
In this case, since the particles of the aluminum compound are dispersed and intervened in the entire raw material, it is not possible to concentrate the periphery of the aggregate particles 3 to make the aluminum rich, so that the amount of the aluminum compound used as a result. Will increase.

Incidentally, the present invention is not limited to the above-described embodiment, but can be appropriately changed. For example, as the aluminum compound, in addition to γ-alumina and aluminum hydroxide, salts such as aluminum phosphate and alum can be used. As aggregate particles, quartz and chamotte, which are easily available in large quantities and at low cost, are used, but other cement waste materials or incinerated ash can also be used.

[0023]

As described above, according to the first means of the present invention, the surface of the aggregate particles is adhered with the particles of the aluminum compound or coated with the aluminum compound, which is used as a raw material for ceramics. By mixing and molding the ceramic base material and baking it, the surroundings of the aggregate particles are made aluminum-rich, and the generation of mullite needle-like crystals is promoted. The mullite needle-like crystals chemically bond with the aggregate particles to densify the structure, so that the obtained product has excellent mechanical strength.

A second means of the present invention is to prepare a raw material for ceramics by adding an aluminum compound, which is a mass-produced product, to the raw material for ceramics. In such a raw material formulation, the periphery of the aggregate particles becomes rich in aluminum, and mullite needle-like crystals are generated, so that a product having excellent mechanical strength is also obtained.

[Brief description of drawings]

FIG. 1 is a drawing showing a particle distribution state of a raw material mixture for ceramics according to a first embodiment of the present invention.

FIG. 2 is a drawing showing a particle distribution of a raw material mixture for ceramics according to a second embodiment of the present invention.

FIG. 3 is a drawing showing a particle distribution of a conventional reinforced raw material mixture for ceramics.

[Explanation of symbols]

 1 ... Raw material particles for ceramics 3 ... Quartz or chamotte aggregate particles 4 ... Aluminum compound particles 5 ... Aluminum compound coating layer

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁶ Identification number Reference number within the agency FI Technical indication location C04B 35/16 (72) Inventor Hideteru Ishida 5-1-1 Koiemoto-cho, Tokoname-shi, Aichi Inax Co., Ltd. Within

Claims (3)

[Claims] 1. In a raw material composition obtained by adding an aggregate to a raw material for porcelain such as feldspar and clay, and mixing the aluminum compound particles around the aggregate particles or coating the aluminum compound. A mixture of raw materials for ceramics, which is characterized in that 2. The raw material mixture for ceramics according to claim 1, wherein the aggregate is quartz or chamotte. 3. A raw material formulation obtained by adding an aggregate to a raw material for porcelain such as feldspar, clay, etc., and additionally adding an aluminum compound to the raw material formulation.