Do ceramics have to be fired immediately after glazing?Is it okay to burn it again every other week?

To glaze ceramic products, it is also necessary to do a careful study to make the glaze adapt to the requirements of the ceramic body, which is the so-called glaze formula.

1. Since the glaze cannot exist separately from the green body, the physical and chemical properties of the green body must be mastered first when conducting glaze research.

That is, the chemical composition of the green body, the expansion performance, the humidity of the boiling and the performance requirements of the finished product, etc.

2. The expansion coefficient of glaze and billet.

The proper fit is the main condition for the glaze to be fixed on the surface of the green body after firing.

If the expansion coefficient of the glaze is less than that of the billet, the glaze layer peels off when cooling;If the expansion coefficient of the glaze is greater than that of the billet, the glaze layer will crack when cooling, and even when excessive stress is generated between the glaze, the product may be damaged.

3. The requirements for the glaze itself must be clarified, such as whiteness, transparency, chemical stability and mechanical properties.

Wait. 4. Attention must be paid to the purity of glaze raw materials. Because the impurities of the raw materials, such as iron and cobalt compounds, will have a great impact on the whiteness and dielectric properties of the glaze.

5. In the study of glaze, it is necessary to grasp a general principle: generally change the composition of the glaze to adapt to the green body rather than change the composition of the green body to adapt to the glaze. This is just as when sewing clothes is always about adapting to the human body, rather than having the human body fit the clothes. Additional Information:

Maintenance of ceramics.

1. Household detergent can be used for daily cleaning.

2. Add a little ammonia with soap.

Or start with equal parts flaxseed and turpentine.

The mixture is more stain-repelling and will give the tiles a more glossy finish.

3. If you sprinkle strong dyeing liquids such as strong tea or ink on the bricks, you should scrub them clean immediately.

4. Regularly polish tiles.

Waxing to achieve long-lasting protection, with an interval of 2-3 months.

5. If there are a few scratches on the brick surface, apply toothpaste to the scratches, and wipe the scratches with a soft dry cloth.

The color of the porcelain that must be fired immediately is glaze and pigment fired at high temperatures. Patching is cumbersome.

It should be completely dry, or the enamel will fall off easily, and it will be fired about a day after glazing.

OK. This method you are talking about is called underglaze.

Underglaze color is a type of porcelain glaze decoration. It is also known as "kiln color". Underglaze color is one of the main decorative means of ceramics, which is to use pigments to paint various ornaments on the plain blanks (i.e., semi-finished products) that have been formed and dried, and then cover them with white transparent glaze or other light-colored glazes, and fire them at one time.

The pattern after firing is covered by a transparent glaze film below, the surface is bright and soft, smooth and not convex, and it appears crystal clear, and the appearance of underglaze colored porcelain should be traced back to the Three Kingdoms period at the end of the Han Dynasty, but at that time it was only a simple color color to decorate the porcelain.

In the real objects that can be seen in reality, underglaze colors include: "Liling underglaze colorful porcelain", "Jingdezhen blue and white", "Jingdezhen glaze red" (or a combination of blue and glaze red).

So what is underglaze? It is accurate to say that the clay (including the unfired clay and the plain burned clay), pigment (that is, the pigment for painting), and glaze (is a transparent glaze, not a color glaze) are fired at a high temperature above 1300 °C at the same time (of which the firing temperature of blue and white and glaze red is 1300, and the firing temperature of Liling underglaze color is 1380).

As long as these three are not fired at the same time at a high temperature above 1300 °C, they must not be underglaze color, and can only be classified into the scope of overglaze color and overglaze color. (Pastel is a type of overglaze color, and the multicolor may be underglaze or underglaze).

Glaze color, glaze color is commonly known as two skins, that is to say, its porcelain and the outside of the decorative pattern, and the outside of the glaze must be fired in 2 times, specifically the first time to fire into the porcelain fetus, and then on the porcelain fetus to paint or cover the glaze for the second time to fire the picture or outer glaze. One of the most important points is that the one that burns outside (i.e., the last one) must be cold, usually 600 to 800 degrees Celsius, usually with lead.

Originally, glazing after drying is more commonly used in sintering, and this is how daily ceramics come from.

After the glaze is poured on the porcelain, it is ready to be fired.

First of all, the kiln is loaded. There are two main types of porcelain kilns: dragon kiln and steamed bread kiln. Dragon kilns are generally built on the slopes of mountains, low and low, in the shape of long strips, like dragons; The steamed bread kiln is tall and large, and the shape is like a steamed bun.

In order to prevent sticking when installing the kiln, there are pottery pads or mat cakes at the bottom of the kiln, and pottery washers are added between the utensils. Fine porcelain is generally packed into a ceramic sagger to protect the utensils from impurities and dust.

After that, the kiln was fired. Porcelain is fired at a high temperature of 1,200 to 1,400 degrees Celsius, and the rate of temperature rise, the nature of the flame and the method of cooling are all directly related to the quality of the porcelain. Therefore, there is a saying among porcelain craftsmen that "one burning, two soil, and three fine work".

The nature of flame is divided into oxidizing flame and reducing flame. The oxidation flame is to make the kiln chamber have enough oxygen, resulting in an oxidation atmosphere; The reducing flame is to make the oxygen in the kiln chamber insufficient, resulting in a reducing atmosphere. Celadon is generally fired with a reducing flame, while white porcelain is fired with an oxidizing flame.

The firing time is mainly related to the type of porcelain and the temperature rise time in the kiln, which is generally 1 hour to 3 days.

Finally, out of the kiln and quality inspection, such a piece of porcelain is basically completed after such a few steps after the glaze. Thank you.

Ah, what a big question... There are so many precautions and methods...

1.The expansion coefficient of the glaze should be adapted to the expansion coefficient of the billet, 2The body should be cleaned before glazing, and the floating ash, wax and oil stains of the body will shrink the glaze and roll the glaze.

3.It's better not to burn it than to burn it.

4.Before firing, you must do a test piece of glaze that you are not familiar with, observe the color changes under different atmospheres and different muds, and do a fluidity test, generally the glaze fluidity of Shandong is very large.

5.For some special glazes, special soil must be used to make blanks, such as opening pieces, which means that the glaze shrinkage is not synchronized, that is, the shrinkage rate of the glaze is slightly larger.

6.After soaking the glaze, pay attention to the bottom of the utensils must be cleaned, otherwise it will stick to the shed board and cannot be taken off.

7.Before glazing, the glaze should be stirred to make all parts even.

8.The glaze layer should not be too thin or too thick, and finally it should not exceed the thickness of the nail cover, otherwise the glaze will crack.

9.The glaze must be even, the hand should be fast, and the glaze should not stay for too long, otherwise it will be too thick.

10.Glazed blanks cannot be washed off.

11.Pay attention to control the moisture content of the glaze when the clay is glazed, and do not penetrate too much into the body.

12.When spraying glaze, be sure to be in a fume hood and pay attention to self-protection.

I'm thinking about this for now, and I'll add it when I'm done.

Dust and oil are the deadliest.

It is possible to glaze on the surface of the fired ceramic.

A large part of the ceramics are fired into blanks, then glazed, and then fired. Daily-use porcelain, building and sanitary ceramics have such a thing. This is called secondary firing.

Glazed ceramics can also be decorated in firing. For example, on the finished tiles, you can decorate them in a variety of ways, and then burn them, which is called third-degree firing. Finally, the material used for decoration is called three-degree firing material, which is already a very mature method both at home and abroad.

There are many things that can be coated on ceramic pieces and re-burned, depending on whether there is color after burning? Or what are the characteristics? What is the effect and how many degrees of fever is re-burned? Anything that can be fired at high temperature belongs to the range of ceramic materials, but the mixing ratio is different.

glaze, usually with pigments added to it.

Pottery can not burn the temperature of porcelain, if you can, there is no difference in ceramics.

Can you paint directly on the glaze after the ceramic blank is glazed, and then burn it? However, there are some changes during the firing process, and the degree of change depends on the composition of the glaze and the color being painted.

Note that you must paint with a special pigment for ceramics.

The firing temperature of architectural ceramics is 1100 degrees Celsius.

After the glaze is dried, the glaze moisture is dry, and the ceramic pigment and printing oil and printing powder are mixed in proportion, and the color you like is drawn with a brush according to what you said, and then fired. The pigments meet and the glaze blends together completely.

Secondary firing, no problem, as long as you're not a mass mechanized production, but you do the model, it's important.

Normal glazing is OK, but generally the second glaze is a low-temperature glaze, if it is a high-temperature glaze, so that it will be mixed together with the first glaze after melting. The second glaze is low-temperature glaze, such as glaze color. Thank you.