Building sanitary ceramics production technology of red glaze Outlook

Published: 16 May 2009 18:57:03

Hygiene in building ceramics products, the red glaze in color glaze is high-grade varieties glaze decoration. Especially red glaze red glaze tiles and sanitary ware products, is currently very popular in domestic and overseas markets and sought after by consumers. Now, because of building sanitary ceramics pigment production process progress, as well as the firing level of science and technology development and improve, ceramics formed a copper red glaze red, cadmium red selenium, manganese red, chrome-tin pink, red chrome aluminum, zirconium, such as iron oxide red Variety series of chemical elements pigment products, much of it has been widely used types of building ceramics products, while others are used successfully in the sanitary ware glaze decoration. At present, ceramic sanitary ware products in the health of the red glaze is formed roses red, carnelian red, orange-red colored glaze Series Products.

1, copper red glaze types of compounds

Varieties in ceramic glazes, copper compounds including copper oxides and other metal salts, which are red glaze colorant must be used. Copper red glaze was primarily due to its fineness cuprous oxide colorants. Some theories say that copper from the copper red glaze fineness of the role of sol precursor substances. Junsuch as ancient China, Jingdezhen kiln in the art of porcelain products, there had been blood red cow, beauty drunk, Ji red, carmine and other well-known varieties of copper red glaze. But then, just make ceramics for daily use and artistic ceramics glaze decoration. Over the past 30 years, copper red glaze has begun entering the field of building decorative ceramics. In the health applications of ceramic products have also made important achievements, copper red glaze coloring agent, including the following types: [1] of copper oxide. The molecular weight of copper oxide was 79.6, the appearance of a black powder, and fired at 1233 degrees in the non-occurrence of decomposition and melting. Under normal circumstances make the green with copper oxide pigment series (using oxidation flame burning). Used to do a red pigment and glaze of copper compounds, mainly the use of cuprous oxide (must be used to restore the flame burning). [2] cuprous oxide. Molecular weight of 142, is characterized by the appearance of a red crystal powder. Such shape of the copper oxide ceramic almost can not be directly used for pigment and ceramic glaze. But containing the copper oxide glaze, using strong oxidizing flame burning, they can produce a red hue. [3] basic copper carbonate. Basic copper carbonate can also be used to do copper compounds paint raw materials.

Copper red glaze of the past must be used to restore the flame burning. If the glaze containing lithium introduced many copper compounds will be made of blue tones, but add 1% of tin oxide used to restore the flame burning, it can be copper red. Because of lithium in reducing flame burning when it has shown to promote the role of red. It is now entirely possible to use modern scientific and technological achievements, such as nanotechnology, rare earth materials, such as the traditional copper red glaze improved with chemical modification to enable them to better application of modern building sanitary ceramics products decorative glaze.

2, manganese compounds in red glaze types

As we all know, is the production of manganese compounds Mn ceramic red glaze raw materials of the main color-developing agent. At present, the types of manganese compounds mainly manganese dioxide and manganese oxide. Its molecular formula for manganese dioxide, a molecular weight of 86.93. Natural manganese dioxide produced in the content of 60-95%, and can be widely used in ceramic pigment. In addition, manganese carbonate. Its molecular weight was 114.9, natural capacity for magnesite, can also be used for ceramic glaze color recipe. In short, the manganese compounds can be used as reddish color agent, used in building sanitary ceramics products in the pigment and glaze.

3, chrome red glaze types of compounds

Chromium compounds can be used for the production of red pigment and glaze. Containing the mineral chromium have potassium dichromate, lead chromate, basic lead chromate, chromium oxide, chromite, etc., and they are the most important source of chromium. Are as follows: (1) potassium dichromate. Molecular weight of 294, look for large red and yellow crystals, at about 800 degrees into a bright red solution, from degrees in 1300 broken down into oxygen and potassium chromate and chromium oxide. It is mainly used for the production of pink ceramic pigment. (2) Lead Chromate. Its molecular weight was 323, the appearance of yellow crystals, commonly known as chrome yellow, decomposition at 600 degrees. (3) Basic Lead Chromate; molecular weight of 546, also known as chromium red. Chrome yellow and chrome red are making ceramic glaze and leaded ceramic glaze of the pigment, such as the well-known sanitary ceramics, which is at a low temperature frit adding basic lead chromate and made. In alkaline glaze, if using yellow lead chromate at neutral to alkaline chromate into the red shown in red. The contrary in acidic chrome red glaze add easily become yellow when. Chrome red glaze crystals are in the lead content of more glaze to add some chromium oxide, lead chromate was fused into the glaze instead of the formation of a red solution. (4), chromium oxide. Molecular weight of 152, the appearance of dark green crystal quality powder, chromium oxide pigment as a variety of raw materials, pigment used in ceramics are very common. The chromium oxide and mixed tin oxide after calcination, the formation of pink pigment. Couplers pink mechanism for chemical compounds, but it may also be chromium oxide and tin oxide mixture of highly dispersed. Chromium oxide is not dissolved in the glaze with tin oxide phase is dispersed in the glaze, such as would have volatile chromium compounds on the kiln, the glaze near the green are many, but on the tin-glaze and glaze of titanium when flanking appeared red. (5) chromite. Molecular weight of 224.08, it is only natural output of chromium mineral, mainly used in ceramicscoloring.

Chromium in the silica content of less a yellow glaze; but in silica content with a small but lead content in many of the glaze, if you add 5% potassium chromate, flame oxidation firing, then become separated from the red crystal glaze, the red are the main cause of basic lead chromate, but this kind of red glaze limited sintering temperature between 960-980 degrees. The production of chrome red glaze, the body of the silica content more appropriate for as low as possible. If you can reduce the alumina content, which will result in beautiful red.

4, chrome-tin pink red glaze types

Chrome-tin red material is calcium carbonate, tin oxide and quartz as major components, matched to a certain amount of chromate with borax flux, etc. are made. It is a kind of pin-type paint, in which the existence of tin oxide is essential. In the introduction of a small amount of tin oxide of chromium, on the can made of light red purple. If you add calcium carbonate and silica are available to high-quality pink. Chrome - tin calcined material can produce low-temperature glaze with warm glaze red coloring agent, especially in warm red agent, to the modern architecture of the red glaze decoration ceramic hygiene meaningful. But only in the main component with chromium oxide, tin introduction to a suitable chemical properties of the glaze before it can form a beautiful red. In recent years, with the development of technology, the purity of color and fineness that there had been substantial improvement in viewing quality pigment has been great change. For example, in recent years the red glaze is one of agate, carnelian red chrome tin red are the best material, become a modern international market the most popular one of sanitary ware glaze decoration. Agate red glaze shading mechanism of chromium ions from melting Qin Shitin dissolved in the crystallization of the color inside. Therefore, in actual use in the base glazesilicon, calcium and a small amount of zinc, magnesium seems to be more conducive to fineness. Have reported that zinc, magnesium material for red agate fineness larger interference, only the introduction of an appropriate amount of zinc, magnesium can not only increase of billet glaze combined with thermal stability, as well as enlarging the scope of the glaze melt, improve the rate of firing of the excellent products. Another red agate oxidation flame must be in an atmosphere of firing, in the event of the atmosphere will be formed to restore the flame red, white, green and white colors and.

5, chrome aluminum red red glaze types

Cr-Al red red spinel agent to fully close to the composition of formula, it is very stable high-temperature sintering is the spinel form of the introduction of glaze in the color reagent. Their shading effect of ceramic art has always been very popular, the scientific certainty. Because it is not in high-temperature chemical changes, be able to get the most stability and the most beautiful red color, so it becomes an ideal Red Glaze.

Here are a few red pigment of the formula for the ceramic enterprises to develop new products development center red glaze product reference. (1) tin oxide 45.5%, 28.4% chalk, red lead 4.5%, potassium dichromate 1.1%, sintering temperature 1000-1020 degrees; (2) 45.5% tin oxide, limestone 28.4%, 20.5% quartz, lead white 9.5%, Lead Chromate (red) 0.7%, sintering temperature 1000-1020 degrees.

In addition, according to recent research results show that the red color ceramic glaze Product variety, the birth of a lead acid uranium, uranium bismuth, iron oxide and iron salt, Zijin Cassius (the most valuable gold red), Zr-Fe red, neodymium salt varieties and other new types of metal compounds. They can some of them have produced a wide range of red color agent, for the red glaze and pigment formulations. Some have been used in building sanitary ceramics products decorative.