What Is Enamel Paint?

Enamel paint is defined more by its qualities than by its content. In the broadest sense, enamel paint means any solvent-based paint that dries to a hard, vitreous (glass-like) shell. Solvent-based paints are also called oil-based paints, in contrast with water-based paints.

Enamel paint springboards off of its root words “smelt” or “melt,” since true enamel is a glass coating that is melted or kiln-baked at extremely high temperatures onto metal or ceramics. Note, however, that enamel paint bears no similarities with the enamel of molten glass, as there is no glass content in this kind of paint. Even traditional baked enamel finishes, long used for vehicles, have nothing to do with glass. The baking is simply a fast route to eliminating solvents and VOCs.

In reality, air-dry enamel paints are far softer than true enamels formed in a kiln. Paint manufacturers have further widened the definition by sometimes attaching the word enamel to water-based paints, thus losing the one ingredient that usually ties together all enamel paints: solvents.
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FROM:thespruce.com

Basic knowledge of enamel glaze

It is used for coating and glazing on metal green tires. It is composed of alkali-boron-silicate glass-like substances. Enamel glaze is coated on metal green bodies. After firing, they can be firmly combined with the green bodies. Decorative effect
The basic ingredients of the enamel glaze include the following 5 base agents: 40% to 60% of the total enamel glaze. The ingredients that determine the main properties of the enamel glaze include silicon oxide, zirconia, titanium oxide, and other fluxes: promote the melting of the enamel glaze and improve its process. Properties and physical and chemical properties: Emulsifiers such as sodium oxide, potassium oxide, boron oxide, etc .: Provide good covering ability to the body. Adhesives such as titanium oxide, antimony oxide, zirconia, strontium oxide, etc .: The ceramic glaze and the body are firmly combined with cobalt oxide and nickel oxide. Copper oxide, antimony oxide, molybdenum oxide, and other colorants: Various colors are given to the enamel glaze to achieve decorative effects. The components are cobalt oxide in bright blue; copper oxide in green or red; chromium oxide in dark green; iron oxide in ochre red, etc. The amount of such oxides is generally 0.1 to 2.5%

It is used for coating and glazing on metal green tires. It is composed of alkali-boron-silicate glass-like substances. Enamel glaze is coated on metal green bodies. After firing, they can be firmly combined with the green bodies. Decorative effect
The basic ingredients of the enamel glaze include the following 5 base agents: 40% to 60% of the total enamel glaze. The ingredients that determine the main properties of the enamel glaze include silicon oxide, zirconia, titanium oxide, and other fluxes: promote the melting of the enamel glaze and improve its process. Properties and physical and chemical properties: Emulsifiers such as sodium oxide, potassium oxide, boron oxide, etc .: Provide good covering ability to the body. Adhesives such as titanium oxide, antimony oxide, zirconia, strontium oxide, etc .: The ceramic glaze and the body are firmly combined with cobalt oxide and nickel oxide. Copper oxide, antimony oxide, molybdenum oxide, and other colorants: Various colors are given to the enamel glaze to achieve decorative effects. The components are cobalt oxide in bright blue; copper oxide in green or red; chromium oxide in dark green; iron oxide in ochre red, etc. The amount of such oxides is generally 0.1 to 2.5%

Melted fully-mixed batches are melted and quenched into a stable enamel glaze at a high temperature (1250 ~ 1400) through a series of physical and chemical reactions. Some of the melts must be fully melted after being melted, and some of them will be semi-melted after being quenched There are three crucible furnaces: crucible furnace furnaces and rotary furnaces, which are also called round furnaces. The batch materials are melted in the crucible and melted at high temperature to complete the melting process. Multiple crucibles are placed to melt different enamels, but the output is small. The thermal efficiency is low. The pool furnace uses continuous operation to feed the materials directly into the furnace for high temperature melting. ) The furnace furnace has a large output, high thermal efficiency, high energy and stable operation, but can only melt a single variety of enamel glaze rotary furnace materials at the same time. The molten horizontal fuel furnace is injected from the end of the cylinder furnace and turned over. The batch is made to melt and operate intermittently. This method has a large output and low heat consumption. The melting quality is more uniform.

Grinding the enamel glaze block into glaze slurry or glaze powder glaze slurry for dipping, coating, electrophoresis, or electrostatic spray glaze powder for spraying, spraying, or electrostatic spraying. Commonly used grinding equipment is the inner lining of a batch ball mill. And ball stones are usually made of quartz hard ceramic or corundum

The types are usually divided into bottom glaze and side glaze. According to the material of the body, it is divided into steel enamel glaze, cast iron enamel glaze, aluminum enamel glaze, copper enamel glaze, and gold and silver enamel glaze. Among them, steel enamel glaze and cast iron enamel glaze application are divided according to the characteristics of enamel glaze. According to the characteristics of enamel glaze, titanium glaze, antimony glaze, etc. are divided into acid-resistant glazes, alkali-resistant glazes with good mechanical properties, wear-resistant glazes, microcrystalline glazes with good mechanical properties, and luminous glazes with optical characteristics, high-temperature glazes with thermal characteristics, etc.

The main effect of the enamel glaze which is directly coated on the green body is to make the green body and the top glaze have a strong bond (adherence). The base glaze can be divided into nickel base glaze, cobalt base glaze, cobalt nickel base glaze, antimony molybdenum base. Cobalt and nickel base glazes such as glazes and mixed base glazes have the widest application range. Antimony molybdenum base glazes are milky white, also known as white base glazes. They have the lowest cost. They are commonly used as base glazes for daily enamels. Mixed base glazes are made by mixing several base glazes in proportion. Improve the firing process performance and improve the adhesion effect of enamel with the green body. It is often used as a base glaze for thick-walled large enamel products with a long firing time.

Glazed glaze Glazed glaze coated on the surface of the product can be divided into milky glaze, colored glaze, transparent glaze, etc .; according to its characteristics, it can be divided into acid-resistant glaze, alkali-resistant glaze, wear-resistant glaze, microcrystalline glaze, luminous glaze, high-temperature glaze, and insulating glaze.

Milky white glaze: Milky white which gives the top glaze strong hiding power. According to the type of opacifying agent in the glaze, it is mainly divided into titanium white glaze, antimony white glaze, and the titanium dioxide in the former porcelain glaze is recrystallized during firing to give the porcelain glaze super milky properties. The thinner layer is the most widely used surface glaze for daily enamels; the latter has an opacifying effect that is inferior to that of titanium dioxide, so the antimony surface porcelain layer is often used in cast iron bath glazes or other non-food enamel products.

Colored glaze: Add coloring agent to milky white glaze. The coloring agent can be added by melting or ball milling. Color glazes mainly include titanium color glaze and antimony color glaze.

Transparent glaze: porcelain glaze with no opacifying effect and transparent appearance is often coated with a layer of transparent glaze to enhance gloss. It is also often used as a base glaze for grinding and coloring. The transparent glazes commonly used for decorative flower glazes are mainly Titanium dioxide transparent glaze

Chemical characteristics Glaze: There are acid-resistant and alkali-resistant glazes. The content of silica in the acid-resistant glaze composition is greater than 65%. It is mainly used for coating chemical machinery enamel products. Alkali-resistant glaze composition is often introduced with a large amount of zirconium dioxide. Chrome oxide titanium dioxide can also be introduced to improve the resistance. Alkali properties

Mechanical properties glaze: wear-resistant glaze can be used to increase the wear resistance of the glaze in two ways. One is to add abrasive components such as silicon carbide boron nitride to the porcelain glaze; the other is to micro-crystallize the porcelain glaze to obtain good wear resistance. Microcrystalline enamel

Optical characteristics glaze: The luminous glaze is added to the enamel glaze by introducing luminous substances such as zinc sulfide and cadmium sulfide.

Thermal characteristics glaze: high-temperature glaze can be used in the temperature above 750 temperature enamel glaze resistance to rapid temperature change performance good enamel composition does not allow alkali metal oxides often contain a large amount (up to 40%) boron oxide and a small amount of beryllium oxide still need to be ground Adding a certain amount of refractory substance such as alumina, chromium oxide and other high-temperature glazes are often used for the protection of jet components or for high-temperature coating of atomic energy reactors.

Electrical characteristics glaze: The resistance glaze is an insulating enamel glaze with a large resistivity. Its composition does not allow alkali metal oxides. It is often used as an insulating material for wires or as an insulating coating material for printed circuit boards.

The enamel enamel enamel enamel enamel products have a coefficient of thermal expansion larger than that of the general face glaze, which has a wider firing range and better elasticity. The edge enamel has a variety of colors and is often used for edge decoration.

Enamel powder for jewelry

Enamel powder20180817 is a fabulous product which enables anyone to create enamelled jewellery designs with ease. These low temperature resin based enamel powders can be used on a wide range of surfaces from metal and glass, to wood and stone.

With its unique properties, enamel powder will harden at 150°c making it perfect for use with a conventional oven, with no need for a kiln.

This article comes from cooksongold edit released

Cobalt blue pigment

Brief description of Cobalt blue pigment:

It’s a cobalt oxide-aluminum oxide. Very costly and extraordinary stable pigment of pure blue colour discovered by Thénard in 1802. It is now the most important of the cobalt pigments. Although smalt, a pigment made from cobalt blue pigment glass has been known at least since the Middle Ages, the cobalt blue pigment established in the nineteenth century was a greatly improved one.

Example of use by artists:

A painting witnesses Renoir’s shifts from cobalt blue pigment to the new and more cheap artificial ultramarine

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This painting was painted during the restless period in Renoir’s work. It is immediately apparent that the picture exhibits two distinct styles. The group of figures on the right is painted in a soft feathery style reminiscent of his work of the later 1870s, while the umbrellas and the couple on the left are painted in a harder manner with more distinct outlines and subdued steely colors. The exact date of the painting is not known, but it is generally accepted that it was worked on over a period of several years.

Notice how the fashions illustrated in the Umbrellas differs. The women in Renoir’s paintings are usually dressed in the latest styles. The dresses and hats worn by the figures at the right conform to a fashion that appeared in 1881 and which became popular in 1882. The vogue was superseded the following year by a more sever style of dress with simple straight lines. THe woman with the band-box is dressed in this latter style which was the height of fashion in 1885-6, but which had fallen out of favor by 1887.

Renoir appears to have changed his palette significantly between the two stages. Examination of the cross-sections has shown that in the earlier phase he used exclusively cobalt blue pigment, available from 1802, his habitual choice during the 1870’s and early 1880’s, but in finishing and revising the composition he used only artificial ultramarine which came in use in the 1870s.

This article comes from webexhibits edit released