TWI777348B - Casting and firing method of oil drop Tianmu glaze ceramics - Google Patents

Abstract

The invention relates to a casting and firing method for oil-drop Tianmu glaze ceramic products, which comprises a preparation step, a glazing step, a first kiln firing step, a second kiln firing step, a second kiln firing step, and an inoculant placement step. Wherein, the inoculant is an inorganic material containing iron, and the inoculant is used to change the atmosphere of kiln firing, so that the oil droplet Tianmu glaze can stably form oil droplets with sub-grain structure in the second kiln firing step Tianmu glaze is crystallized, so as to provide a casting and firing method for oil-drop Tianmu glaze ceramics with improved process.

Description

Casting and firing method of oil drop Tianmu glaze ceramics

The invention relates to a kiln firing method for ceramic products, in particular to a casting and firing method for oil drop Tianmu glaze ceramic products using secondary kiln firing and iron-containing inoculants.

As a crystalline glaze with high ornamental value, oil-drop tianmu glaze is widely welcomed in East Asian countries. In order to increase the diversification of ceramics with oil-drop tianmu crystals, oil-drop tianmu glaze and related production methods have also been developed.

For example, Chinese Patent No. I422655 discloses a kind of oil drop Tianmu glaze prepared by using vegetable ash as raw material and its preparation method, which is to use vegetable ash to prepare a glaze slurry, and after applying the glaze slurry to the surface of a green body, in an oxidizing atmosphere The temperature is raised to between 1200 and 1260 ° C within 4 to 8 hours, and the temperature is maintained for 30 to 60 minutes, and then the furnace is cooled and fired.

However, in practice, according to the finished product fired by the existing oil drop Tianmu glaze production method, there is still a considerable proportion of them that cannot smoothly generate oil drop Tianmu glaze crystals. Therefore, the existing oil drop Tianmu glaze production method does need to be improved. place.

In order to solve the problem that in the finished products fired according to the existing oil drop Tianmu glaze production method, there is still a considerable proportion of oil drop Tianmu glaze crystals that cannot be formed smoothly, the invention provides a casting and firing method for oil drop Tianmu glaze ceramic products, which is effective. Another process is provided, further described below.

The invention relates to a casting and firing method for oil-drop Tianmu glaze ceramic products, which comprises the following operation steps: Preparation steps: prepare a blank, an oil drop Tianmu glaze, a heating furnace and an inoculant, wherein the inoculant is an inorganic material containing iron; Glazing step: applying the oil drop Tianmu glaze to the surface of the china; The first kiln firing step: put the china that has completed the glazing step into the heating furnace, and heat it up to 1200 to 1400°C at a rate of 100°C/1 hour, hold the temperature for 30 minutes, and then lower the temperature; Step of placing the inoculum: after the first kiln firing step, placing the inoculant in the furnace; and The second kiln firing step: the temperature is raised to 1250 to 1400°C at a rate of 100°C/1 hour, and the atmosphere in the heating furnace is changed by the inoculant, so that the oil drop Tianmu glaze is placed in the heating furnace. An oil drop Tianmu crystal is formed, and after holding the temperature for 30 minutes, an oil drop Tianmu glaze ceramic product is obtained after cooling down.

Further, in the casting and firing method of the above-mentioned oil drop Tianmu glaze ceramic product, in the preparation step, the inoculant is cast iron, iron sulfide or iron phosphide.

Still further, the casting and firing method of the above-mentioned oil drop Tianmu glaze ceramics, wherein in the glazing step, the method of spraying, showering, coating or printing is used to make the oil drop Tianmu glaze evenly adhere to the element. the surface of the blank.

Preferably, in the above-mentioned casting and firing method of oil-drop Tianmu glaze ceramic products, the temperature is raised to 1260 to 1320° C. in the second kiln firing step.

With the above-mentioned technical features, the present invention makes secondary kiln firing after adding iron-containing inorganic material as an inoculant in the heating furnace, so that crystals can be formed further smoothly for works without crystal formation after the first kiln firing. , effectively providing another casting and firing method for oil-drop Tianmu glaze ceramics that can improve yield.

In order to understand the technical features and practical effects of the present invention in detail, and to realize according to the contents of the description, the preferred embodiments shown in the drawings are further described in detail as follows:

The present invention relates to a casting and firing method for oil-drop Tianmu glaze ceramics, and its preferred embodiment is shown in FIG. 1 , which includes a preparation step S1, a glaze application step S2, a first kiln firing step S3, and a setting step S3. The operation steps of the inoculant injection step S4 and the second kiln firing step S5 are described in detail as follows for each operation step:

In the preparation step S1, prepare a blank, an oil drop Tianmu glaze (hereinafter referred to as a glaze), a heating furnace and an inoculant, wherein the components and preparation methods of the blank and the glaze are the same as those of the prior art. The same is the same, so it will not be described in detail here. In a preferred embodiment of the present invention, the heating furnace is an electric kiln. On the other hand, the inoculant is an inorganic material containing iron, such as cast iron, iron sulfide, phosphating Iron and other materials can also be iron-containing waste.

Next, in the glazing step S2, the glaze is uniformly attached to the surface of the china by means of spraying, showering, coating or printing.

Next, the first kiln firing step S3 is performed, and the china that has completed the glazing step S2 is placed in the heating furnace, and heated under a specific kiln firing condition. In a preferred embodiment of the present invention, the kiln firing condition is 100 The temperature was raised to 1200 to 1400°C at a rate of ℃/1 hour, and the temperature was maintained for 30 minutes, and then the temperature was lowered.

The step S4 of placing the inoculant is to place the inoculant in the heating furnace after the first kiln firing step S3 is completed.

After completing the step S4 of inserting the inoculant, the second kiln firing step S5 can be performed, and the heating is carried out under the aforementioned kiln firing conditions, and the temperature is raised to 1250 to 1400°C at a rate of 100°C/1 hour, and after holding the temperature for 30 minutes, The temperature is then lowered; wherein, heating to 1260 to 1320° C. is a better condition.

Since the kiln is heated to 1250 to 1400 °C, the inoculant generates iron ions due to high temperature, which in turn changes the atmosphere in the heating furnace, and because of the iron ions in the atmosphere, oil droplets are induced to crystallize. The principle of crystal phase generation is to change the surface energy, so that the oil drop Tianmu glaze can form the oil drop Tianmu crystal with sub-grain structure in the heating furnace. After completion, an oil drop Tianmu glaze ceramic product 10 is obtained.

It is further added that in 1948, the United States and the United Kingdom added magnesium to cast iron, and then used ferrosilicon to nucleate to obtain ductile iron. In this case, cast iron and other materials were used to change the atmosphere in the heating furnace, thereby inducing iron crystallization and forming oil droplets Tianmu glaze, which is oil. Casting and firing method of Ditianmu glaze ceramics.

Further, in order to verify the effect of this casting and firing, the inventors carried out four sets of experiments as shown in Table 1 below under different conditions of whether to conduct secondary kiln firing and whether to add inoculants in the heating furnace. The experimental results are described as follows .

Table 1 experiment Material Processing methods result 1 Green body, glaze Kiln firing conditions*, inoculant Rough and blistered surface 2 Green body, glaze Kiln firing conditions* In this work, no oil droplets have been seen to form Tianmu crystals. 3 Works of Experiment 2 Kiln firing conditions* In this work, no oil droplets have been seen to form Tianmu crystals. 4 Works of Experiment 2 Kiln firing conditions*, inoculant Good product, oil droplet Tianmu crystals are formed *The kiln firing conditions are to raise the temperature to 1250 to 1400°C at a rate of 100°C/1 hour, hold the temperature for 30 minutes, and then lower the temperature.

Experiment 1 and Experiment 2 are the results obtained by using the glazed china for the first kiln firing:

Please refer to Table 1, Fig. 2A and Fig. 2B. In experiment 1, in the first kiln firing step of the present invention, the inoculant is added and the reaction is carried out at the same time, so that the china just finished glazing is directly inoculated in the kiln. The result is shown in Figure 2A and Figure 2B, the surface of the finished product is rough, and there are pits and blisters, and no oil droplets are formed.

As shown in Table 1, Figure 3A, Figure 3B and Figure 3C, Experiment 2 is the finished product after the first kiln firing step S3 of the present invention is completed, which is similar to the prior art, although the fired enamel is better than that of Experiment 1. The finished product, but still no oil droplets of Tianmu crystals are formed, but a bright work; further, as shown in Figure 4, the surface of the work only has fog-like spots, but no crystals are formed.

Experiment 3 and Experiment 4 are the results obtained from the second kiln firing using the works of Experiment 2:

As shown in Table 1, Fig. 5A, Fig. 5B and Fig. 5C, experiment 3 is to carry out the second kiln firing step S4 (that is, the step S3 of inserting the inoculant is omitted) without adding the inoculant, as shown in Fig. 5A, Fig. As shown in Fig. 5B and Fig. 5C, the obtained results are almost the same as the results of Experiment 2, and still no oil droplet crystals are formed.

Finally, as shown in Table 1, Fig. 6A, Fig. 6B and Fig. 6C, Experiment 4 is according to the casting and firing method defined by the preferred embodiment of the present invention, after the preparation step S1, the glazing step S2, the first kiln firing Step S3, the finished product obtained after the step S4 of inserting the inoculant and the second kiln firing step S5, as shown in Figure 5C, after the second kiln firing with the inoculant added, the crystals of the oil drop Tianmu glaze are clearly visible, and it is a good product , therefore, the casting and firing method provided by the present invention can indeed improve the problems of the prior art; further, as shown in FIG. 7A, after magnifying the surface of the good product 5000 times, dendrites can be seen, and due to the angle of the dendritic structure, Different shades can refract light, create different interferences, and make the oil droplet Tianmu crystals have different colors; further, as shown in Figure 7B, after magnifying the surface of the good product by 10,000 times, secondary grains can be seen.

In addition, the user can slightly adjust the composition of the glaze, and the finished products fired through the adjusted glaze are shown in Figures 8 to 10. Depending on the composition and proportion, the fired oil droplet Tianmu crystal Can show different colors, such as blue, silver, gold and so on.

With the above-mentioned technical features, the present invention makes secondary kiln firing after adding iron-containing inorganic material as an inoculant in the heating furnace, so that crystals can be formed further smoothly for works without crystal formation after the first kiln firing. , to improve the casting and firing process of oil drop Tianmu glaze ceramics, effectively improve the problem of the existing oil drop Tianmu glaze production method, so as to provide a casting and firing method of oil drop Tianmu glaze ceramics that can improve the yield.

The above are only preferred embodiments of the present invention, and are not intended to limit the present invention in any form. Anyone with ordinary knowledge in the technical field can utilize the present invention without departing from the scope of the technical solutions proposed by the present invention. Equivalent embodiments with partial changes or modifications made to the disclosed technical content, which do not depart from the technical solution content of the present invention, are still within the scope of the technical solution of the present invention.

10: Oil drop Tianmu glaze ceramics S1: Prepare S2: Glazing S3: The first kiln firing S4: Insert the inoculant S5: The second kiln firing

FIG. 1 is a flow chart of the operation of the preferred embodiment of the present invention. 2A and 2B are photographs of the finished product of Experiment 1. FIG. 3A, 3B and 3C are photographs of the finished product of Experiment 2. FIG. Figure 4 is a metallographic image of the finished product of Experiment 2 magnified 1000 times by an electron microscope. 5A, 5B and 5C are photographs of the finished product of Experiment 3. FIG. 6A, 6B and 6C are photographs of the finished product of Experiment 4. FIG. Figure 7A is a metallographic image of the finished product of Experiment 4 magnified 5000 times by an electron microscope. FIG. 7B is a metallographic image of the finished product of Experiment 4 magnified 10,000 times by an electron microscope. Figures 8 to 10 are photographs of finished products fired by changing the composition of the oil drop Tianmu glaze.

10: Oil drop Tianmu glaze ceramics

S1: Prepare

S2: Glazing

S3: The first kiln firing

S4: Insert the inoculant

S5: The second kiln firing

Claims (5)

A casting and firing method of oil-drop Tianmu glaze ceramic product, which comprises the following operation steps: Preparation steps: prepare a blank, an oil drop Tianmu glaze, a heating furnace and an inoculant, wherein the inoculant is an iron-containing inorganic material; Glazing step: applying the oil drop Tianmu glaze to the surface of the china; The first kiln firing step: put the china that has completed the glazing step into the heating furnace, and heat it up to 1200 to 1400°C at a rate of 100°C/1 hour, hold the temperature for 30 minutes, and then lower the temperature; Step of placing the inoculum: after the first kiln firing step, placing the inoculant in the furnace; and The second kiln firing step: the temperature is raised to 1250 to 1400°C at a rate of 100°C/1 hour, and the atmosphere in the heating furnace is changed by the inoculant, so that the oil drop Tianmu glaze is placed in the heating furnace. An oil drop Tianmu crystal is formed, and after holding the temperature for 30 minutes, an oil drop Tianmu glaze ceramic product is obtained after cooling down. The casting and firing method for oil-drop Tianmu glaze ceramics according to claim 1, wherein in the preparation step, the inoculant is cast iron, iron sulfide or iron phosphide. The casting and firing method of the oil drop Tianmu glaze ceramic product according to claim 1 or 2, wherein in the glazing step, the oil drop Tianmu glaze is made uniform by spraying, showering, coating or printing. attached to the surface of the green body. The casting and firing method of the oil drop Tianmu glaze ceramic product according to claim 1 or 2, wherein in the second kiln firing step, the temperature is raised to 1260 to 1320°C. The casting and firing method of the oil drop Tianmu glaze ceramic product according to claim 3, wherein in the second kiln firing step, the temperature is raised to 1260 to 1320°C.

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