KR20110134645A

KR20110134645A - Light weight ceramic composition for porcelain application

Info

Publication number: KR20110134645A
Application number: KR1020100054332A
Authority: KR
Inventors: 이상진
Original assignee: 목포대학교산학협력단
Priority date: 2010-06-09
Filing date: 2010-06-09
Publication date: 2011-12-15

Abstract

PURPOSE: A lightweight ceramic composition for daily ceramics is provided to reduce the weight of the ceramic composition by using ternary components-based ceramic materials, diatomaceous earth powder, and white clay powder to reduce the density of ceramics. CONSTITUTION: A lightweight ceramic composition for daily ceramics includes 20-40 weight% of ternary components-based ceramic materials, 50-60 weight% of diatomaceous earth powder, and 20-10 weight% of white clay powder. The ternary components-based ceramic materials are composed of clay, silica, and feldspar. A sintering process is implemented at a temperature between 1200 and 1300 degrees Celsius for 1 to 2 hours. The sintering intensity of the ceramic composition is to be between 110 and 120MPa. The density of the ceramic composition is between 1.25 and 1.32g/cm^3. The shrinkage rate of the ceramic composition is between 1 and 4.

Description

Light weight ceramic composition for porcelain application

The present invention relates to a light weight base material composition for living magnetic.

As light plastics and disposable containers are widely used in pursuit of the convenience of living, the use of relatively heavy household magnetic tableware is gradually decreasing.

In order to increase the use of high-quality and profound household ceramic utensils, the weight of living magnetics is emerging, and if this becomes possible, it will enable not only the vitalization of the household magnetic market but also the advanced food culture. To this end, it is important to develop and develop the Samsung division, which is used in the manufacture of existing general household appliances, and to achieve a light weight of the final product.

On the other hand, the domestic situation in the field of living magnetics is losing competitiveness due to increased labor costs and imports of cheap Chinese products, and technology development such as new special body development is urgently needed to overcome this.

Corning glass products have been developed for a long time to lighten the life of the self, but the development of domestic technology is urgent due to the high cost and most of them depend on the import, and the dolomite material is used for the light of the life. There was a problem that the high absorption rate of the product is low value as a product.

The inventors of the present invention have made a research effort to solve the above problems, by mixing various materials in the existing three-component base material for living magnetic, considering the light weight and other physical property changes, the life showing the optimum density value and sintered strength The magnetic base material composition could be developed, and therefore the present invention has an object to provide a lightweight base material composition for living magnetism that exhibits excellent sintered strength and an optimal density value.

As an example for achieving the above object, the light weight base material composition for living magnetism of the present invention includes 20 to 40 wt% of three-component magnetic base material composed of clay, silica and feldspar, 50 to 60 wt% of diatomaceous earth powder and 10 to 10 clay powders. It comprises 20 wt%.

Hereinafter, the light weight holding composition for living magnetism of the present invention will be described in detail for each component.

Lightweight base material composition for living magnetic of the present invention is a three-component magnetic base material widely used as a base material for conventional living magnetic, consisting of clay (40wt%), silica (30wt%) and feldspar (30wt%) It is included in the range of 20 to 40 wt% of the total body composition, when the content of the three-component magnetic base material is more than the above range, the degree of density reduction is gentle and is not effective in achieving light weight.

The diatomaceous earth powder has an open structure with a structure similar to clay, which is a main component of porcelain, and thus has a very low specific gravity, and thus is suitable for light weight, has a color close to white, and has excellent sinterability. It shows the characteristic that a big problem does not arise in mixing with a base.

Such diatomaceous earth powder is contained in 50 to 60% of the total weight of the composition, and if the content of the diatomaceous earth powder is less than the above range tends to have a low density reduction effect, when the content of the diatomaceous earth powder exceeds the above range compared to the content added The effect of reducing the density is not large, and the surface of the specimen, that is, the living magnetic, manufactured with the base material is not smooth and tends to bend during sintering.

The addition of the clay powder significantly reduces the shrinkage rate and decreases the density value, which is more advantageous for achieving light weight. Such clay powder is contained in 10 to 20% of the total weight of the composition, the effect of reducing the shrinkage and density sensitivity is not great when the amount of the clay powder added is less than the above range, relatively different components when the amount of the clay powder is more than the above range It is undesirable to reduce the content of.

The three-component base, diatomaceous earth, and clay are mixed, milled, powdered, and slurried to cast porcelain, wherein the concentration of the slurry is adjusted to 40 to 50 wt% of water to be added.

The present invention is to mix the low-density ceramic raw material of the open structure as described above in the three-component magnetic base material without effecting a large change in the existing domestic magnetic manufacturing process, to maintain the inherent properties of the living magnetic, only to reduce the specific gravity to achieve the light weight effect Can be obtained.

That is, when the three-component magnetic base material is powdered and pressed, and then sintered at 1200 ° C. for 1 hour, it shows a shrinkage of about 3% and a density value of 2.44 g / cm 3. The density of the base material of the present invention is 1.32 It appears up to g / cm <3> and can achieve 45% or more of weight reduction.

In addition, the composition of the present invention has a sintered strength obtained after sintering at 1200 to 1300 ° C. for 1 to 2 hours in a range of 110 to 120 MPa, a density of 1.25 to 1.32 g / cm 3, and a shrinkage of 1 to 4 ranges.

The above-described holding composition of the present invention is preferable since the first casting of a slurry containing 5 wt% of talc in a mold in advance, and the casting of the holding composition therein is easier.

In addition, the base material composition of the present invention shows good wettability and excellent surface roughness when using a white glaze containing 7 wt% of zircon after primary sintering, and shows good results even at a sintering temperature of 1200 to 1300 ° C.

According to the present invention described above, it is possible to expect the effect of producing a light weight household magnetic with reduced density.

According to the present invention as described above, if it is possible to manufacture a lightweight household magnetic, it will be possible to facilitate the transport and use in the field of using a large amount of household magnetic tableware, such as a restaurant.

Since the production process using the existing three-component base material holding composition of the present invention can be produced, there is an advantage that can utilize the existing production line as it is.

1 is a graph comparing the shrinkage rate and the density according to the temperature of the mixed body of 70 wt% tricomponent and 30wt% vermiculite.
Figure 2 is a graph comparing the shrinkage and density of the sintered specimens according to the change in the content of the diatomaceous earth powder added to the three-component base material.
Figure 3 is a graph showing the change in density and shrinkage according to the mixture amount of diatomaceous earth and clay in the three-component base mixture [the content of diatomaceous earth is fixed to 60wt%, the content of white clay changes according to the three-component soaking agent content].
Figure 4 is a graph comparing the shrinkage and density of the sintered specimens according to the content of the clay powder added to the three-component base material.
5 is a photograph of a sample coated with a glaze containing 7 wt% of zircon and sintered at 1250 ° C.
6 is a photograph of a sample coated with 10 wt% zircon and sintered at 1250 ° C.
7 is a photograph of a sample coated with a glaze containing 7 wt% of zircon and sintered at 1300 ° C.
8 is a light weight magnetic sample photograph prepared by Example 3.

Hereinafter, the present invention will be described in detail with reference to examples and drawings, but the present invention is not limited to the following examples.

Comparative example One. 3-component system Possession and Vermiculite , Shrinkage and density of each diatomaceous earth

Three-component base material consisting of clay, silica, and feldspar (Hyundai Co., Ltd., Superbone Co., Ltd. SPV-3) was pulverized and pressed for 1 hour at 1200 ° C, resulting in 3% shrinkage and 2.44 g / cm 3. In the case of vermiculite powder, after sintering at 1200 ° C. for 1 hour, the shrinkage was 6% and the density value was 2.27 g / cm 3, and in the case of diatomaceous earth powder, sintered at 1200 ° C. for 1 hour after pressing molding. The result showed a shrinkage of 12% and a density of 1.64 g / cm 3.

Comparative example 2. Changes depending on the temperature of mixed base Vermiculite )

After sintering the three-component base material and vermiculite at different mixing ratios, the results were confirmed. When the content of vermiculite was changed to 5wt%, 7wt%, 10wt%, 30wt% and sintered at 1250 ° C, a part of the sample melted and adhered to the alumina substrate.

Thus, when the vermiculite content was 30 wt% and sintered up to 1200 ° C, the shrinkage and density were 6%, 2.2g / cm3 and 8%, and 2.36g / cm3 at 1100 ° C and 1150 ° C, respectively. One].

Sintering Temperature Shrinkage (%) Density (g / cm 3) 1100 ℃ 6 2.2 1150 ℃ 8 2.36 1200 ℃ Almost none 2.41

Comparative example 3. Variation according to the temperature of mixed base by component (diatomaceous earth)

The three-component base and the diatomaceous earth powder were sintered at 1250 ° C. with different mixing ratios, and the results were confirmed. As the addition amount of diatomaceous earth powder was increased, the density was observed. In case of adding 80wt% of the diatomaceous earth powder, the density decreased to 1.54 g / cm 3, but the surface was not smooth, and it was confirmed that the warping phenomenon appeared during the sintering [Table] 2 and FIG. 2].

Diatomite Mixing Amount Shrinkage (%) Density (g / cm 3) Diatomite 30wt% 9 2.05 Diatomaceous Earth 60wt% 7 1.70 Diatomite 80wt% 8 1.54

As shown in Table 2, when the content of the diatomaceous earth mixed with the three-component base to 30wt% to 80wt% was changed, the shrinkage did not show a large change depending on the amount added, it can be seen that the shrinkage of about 8% have.

Example 1 and 2. Changes depending on the temperature of the mixture Three component system + Diatomaceous earth + clay)

After sintering, the experiment was carried out to further reduce the density by using a mixture of 60wt% diatomaceous earth having a minimum surface density without any warping and a smooth surface.

That is, three component-based bodies and white clay were added to 60 wt% of the diatomaceous earth powder mixed as follows to confirm the shrinkage and density change after sintering at 1250 ° C. [Table 3 and FIG. 3].

Amount Diatomaceous earth + three-component soil + white earth Shrinkage (%) Density (g / cm 3) Example 1 60wt% + 30wt% + 10wt% 4 1.32 Example 2 60wt% + 20wt% + 20wt% One 1.25

As shown in Table 3, after mixing the clay, the shrinkage was significantly reduced, it was confirmed that in Example 2 the density is reduced to 1.25g / ㎠.

In the case of Example 2, the density value of 1.25 g / cm 3 is almost 50% lower than that of 2.44 g / cm 3, which is the density of the existing three-component base material, which is a significant result that can result in 50% weight reduction.

Meanwhile, according to FIG. 3, in which diatomaceous earth is fixed at 60 wt% and the amount of tri-component base and clay is relatively changed, as shown in FIG. 3, as the content of the tri-base base increases, the density gradually increases, and the shrinkage rate is It can be seen that the rapid increase from above 20wt%.

Comparative example 4. Variation according to the temperature of mixed body by component (white soil)

The three-component base and the clay powder were sintered at 1250 ° C. with different mixing ratios, and the results were confirmed. In other words, as a result of confirming the change of density and shrinkage rate by putting the clay in the three component system, it was confirmed that the high shrinkage rate of 10% or more and the density value of 2g / cm 3 or more were shown [Table 4].

Shrinkage (%) Density (g / cm 3) White clay 20wt% 10.56 2.08 White clay 60wt% 11.26 2.28

From the above results, it can be seen that only the clay is added to the three-component base, and the reduction in density is not greatly reduced, and the diatomaceous earth and the clay are simultaneously mixed to reduce not only the density but also the shrinkage rate.

Experimental Example 1. Confirmation of slip casting desorption using lightweight body

30wt% 3, a light weight composition having a density of 1.32 g / cm 3 (about 45% lighter than existing three-component bases) to improve moldability and access to other existing three-component bases. The following experiment was carried out by selecting the component-based material + 60wt% diatomaceous earth + 10wt% white earth [Example 1].

In the case of the lightweight body, the desorption experiment was performed to solve the problem of the desorption in the slip casting process as compared to the conventional three-component body.

A slurry containing 5 wt% of talc was prepared and first cast in a gypsum mold for a very short time to form a very thin talc layer, followed by light weight slipcasting, followed by clean desorption.

Experimental Example 2. Lightweight possession and glaze test

In order to obtain the lightness and the whiteness and light transmittance of the conventional three-component system, a white glaze containing zircon was prepared to test the wettability of the glaze and its potential as a glaze.

The composition of the glaze was tested by adding 7wt% and 10wt% of zircon powder to the conventional three-component glaze, respectively.As a result, in the case of the 7wt% zircon-containing glaze composition, the wettability of the first sintered light weight was good. It showed excellent surface roughness and the heat treatment temperature was found to show good results at both 1250 ℃ and 1300 ℃.

Example 3. Experiment on final light weight porcelain manufacturing

Compared to the existing three-component base material, the lightweight household magnetics were manufactured with the composition of 40 wt%, diatomaceous earth 50 wt%, and white clay 10 wt%.

First, the first slip casting is performed by using a slurry containing talc of 7 wt%, and the talc is uniformly applied to the gypsum mold, and the dried three-component base, diatomaceous earth, and clay are mixed in a predetermined ratio. , Slurry was prepared by mixing water and ceramic balls and ball milling for 24 hours. In the case of the prepared slurry, the specific gravity was about 1.2, and there was almost no bubble, and it was poured into the gypsum mold and slip casted. After completely drying the molded lightweight porcelain porcelain, the talc of the surface was removed using a brush, and then calcined at 800 ° C. first, lubricated with color oil, completely dried, and then calcined at 1,200 ° C. for 2 hours. . Due to the characteristics of the glaze, it was confirmed that sufficient magnetization occurred even when fired at 1200 ° C. The result is shown in FIG. 8.

Experimental Example 2. Check the strength of manufactured lightweight magnetics

In Example 3, the lightweight magnetic material sintered at 1200 ° C. for 1 hour in the form of a bend bar was subjected to the bending strength test by Instron, and the average strength of 120 MPa was obtained. This is sufficient strength for use as a magnetic product.

The present invention described above is not limited to the above-described embodiment and the accompanying drawings, and various substitutions, modifications, and changes are possible within the scope without departing from the technical spirit of the present invention. It will be evident to those who have knowledge of.

.

Claims

20 to 40 wt% of a three-component magnetic base composed of clay, silica and feldspar, 50 to 60 wt% of diatomaceous earth powder, and 20 to 10 wt% of clay powder.

The method according to claim 1,
The substrate composition has a sintered strength obtained after sintering at 1200 to 1300 ° C. for 1 to 2 hours in a range of 110 to 120 MPa, a density of 1.25 to 1.32 g / cm 3, and a shrinkage rate of 1 to 4 Lightweight body composition for.