1. What is a ceramic coating?
Ceramic coating refers to spraying with ceramic coating materials.
Ceramic coatings include: high-temperature thermal insulation coating, wear-resistant and corrosion-resistant coating, heat treatment protective coating, high-temperature lubrication coating and atomic energy coating.
Characteristics of ceramic coating: wear resistance, corrosion resistance, anti-sticking, high hardness, high temperature resistance and good biocompatibility.
Introduction of ceramic coating
Ceramic coating is the general name of inorganic protective layer or film covering the foundation surface. It can change the morphology, structure and chemical composition of the substrate surface and endow the substrate with new properties (wear resistance, corrosion resistance, anti-adhesion, high hardness, high temperature resistance and good biocompatibility).
Composition: oxide coating, non-oxide coating, silicate coating and composite ceramic coating.
Process methods: melt coating, spray coating, vapor deposition coating, electrochemical process layer, sol-gel coating and in-situ reactive coating.
Second, the advantages and disadvantages of ceramic coated non-stick pan
1, non-stick pan is a pan that does not stick to the bottom of the pan when cooking, because the bottom of the pan is coated with a non-stick coating. Common non-stick properties are Teflon coating and ceramic coating. Secondly, there are special craft woks and stainless steel pot.
2. Advantages: Ceramics played an important role in the upgrading process of non-stick pan. The performance of ceramics is stable, and its safety has been fully proved after thousands of years of use. ? Nano-technology is used to make the surface of the product dense and pore-free, so as to achieve the effect of non-sticking.
3. Disadvantages: Why can't a non-stick pan make acidic food? Acidic foods include all kinds of meat, eggs, sugar, rice and so on.
4. There are three main materials for non-stick pans sold in the market:
A, aluminum alloy, with a thick layer of alumina on the surface;
B, stainless steel, with a layer of chromium oxide on the surface, with strong corrosion resistance and slow corrosion;
C, iron, iron is easy to be corroded by acid in a large area, thus coating. Non-stick pans made of corrosive metals such as iron cannot be used to make acidic food. Non-stick pan is made of metal with strong corrosion resistance. Try not to make acidic food.
Third, ceramic coated non-stick pan?
1, there is no potential safety hazard in normal use.
It is often said that PTFE contains harmful substances. Is it really safe? It is understood that cookware using Teflon non-stick coating will not change in the temperature range from normal temperature to 260℃, but when the temperature exceeds 260℃, the coating gradually becomes unstable. However, in daily cooking, high-temperature stir-frying usually only reaches about 200℃, and even if frying is used, the oil temperature will generally not exceed 250℃, so there is no need to worry about coating decomposition and release of harmful substances in normal cooking.
Teflon non-stick pan has long been widely used in western developed countries. Non-stick pans have been popularized in China since 1990s, and more and more consumers are beginning to recognize their performance. A spokesman for the General Administration of Quality Supervision, Inspection and Quarantine once said that the quality and safety of non-stick pan products produced by China enterprises that meet the national mandatory standards are guaranteed, and consumers can use them with confidence.
2. If the coating falls off, replace the cooker.
Experts say that under the strong external force, such as scraping and polishing with sharp objects, the coating of non-stick pan may fall off. In order to ensure the rapid and uniform heat conduction of non-stick pan products, aluminum alloy is often used as the raw material for making pots and pans. After the coating falls off, the directly exposed aluminum alloy will contact with food, resulting in local high temperature, burns, oil smoke, pot sticking, pot overflow and other phenomena. However, aluminum will precipitate heavy metal elements at too high a temperature. Some experts said that avoiding the direct contact between aluminum in the pot and food can ensure the health of food. Therefore, no matter from the point of view of use or health, the pan should be replaced in time after the coating falls off.
3. Multi-layer system protection is more in place
According to different functions, non-stick pan products can be divided into boiling pan, frying pan, frying pan and milk pan; According to the non-stick coating system on the inner surface, the non-stick pan can be divided into one-layer system, two-layer system and three-layer system pan. The person concerned explained that a one-layer system refers to a non-stick layer composed of a single coating; Two-layer system refers to a non-stick layer composed of two kinds of coatings: the bottom layer and the top layer; Three-layer system refers to a non-stick layer composed of bottom layer, middle layer and surface layer. Dapeng Huang introduced that the thickness of the coating can be enhanced by appropriately increasing the number of layers of the coating system, thus significantly improving the wear resistance and scratch resistance of the coating and prolonging the service life of the cooker.
Although many friends are skeptical or negative about the safety and health of ceramic coatings on the surface of ceramic pot, in fact, according to the above description, we can find that these concerns are unnecessary. Because this treatment is a food-grade process, it generally does not cause any harm. In addition, in order to facilitate the buyer's choice, the above example also includes the manufacturer's price information of ceramic coatings. Through the analysis of this information, we can enjoy more cost-effective services.