KR100558094B1 - Cooking ware - Google Patents

Abstract

The present invention relates to a cooking vessel excellent in durability, and more particularly, a crystal structure by first applying an amorphous coating to the surface of a pan, a pan, a grill, a confectionery mold, etc. made of metal such as aluminum, followed by Teflon coating. Increasing the bonding strength between different metals and Teflon reduces the difference in heat conduction as well as the durable floor surface, making a cooking vessel that does not easily peel off at high temperatures.

In order to achieve the above object, the present invention relates to an inner coating of a cooking vessel such as a pot, a pot, a frying pan, a grill, a confectionery mold, and the like used on a high temperature stove,

More specifically, it has a higher wear resistance, corrosion resistance and durability on the surface of the cooking vessel made of metal such as aluminum, titanium, or stainless steel.

The inner surface of the cooking vessel is thermally coated with an amorphous material to clean the surface, and then dried to roughen the surface by sand blasting, etc., and then coated with Teflon on the upper portion, wherein the amorphous water is Cr 40.0 to 50.0 by weight%. %, B 2.5-6.5%, Si 0.5-5.0%, and the composition of C 0.0-0.5% and Mn, Ni, Mo, Cu, Ti, V, Zr, Nb, Hf, Ta, W is 0.0-5.0 It is characterized by providing a cooking container excellent in wear resistance, corrosion resistance and durability by consisting of alone or in combination with%, and the remainder composed of impurities inevitably contained with Fe.

Frying pan, cooking container, amorphous

Description

Cooking container {Cooking ware}

The present invention relates to a cooking vessel, and more particularly, to abrasion resistance and corrosion resistance by coating an amorphous phase on the inner surface of a vessel constituting a frying pan or a pot, a pot, a pot or a confectionery mold for working fish or meat on a hot fire. The present invention relates to a cooking container which improves the durability of the product by improving at the same time.

In general, pots or pans used as cooking vessels are made of aluminum alloy, titanium, or stainless steel to prevent corrosion. Iron (Fe) has the disadvantage of being the most widely used metal or rust. This molten hydroxide and oxide is not toxic unlike copper. Cookware made of iron has good thermal conductivity and oil does not penetrate the surface easily when cooking.

And stainless steel is made of chromium and iron or alloys of iron, chromium and nickel in order to compensate for the rusty defects of steel, has a beautiful luster, has a strong advantage against weak acids and alkalis. Copper is the second most thermally conductive metal after silver and has good workability but is heavier and less resistant to corrosion than aluminum or stainless steel. The heat conduction is good, so the heat reaches the upper part easily and the heat capacity is big so it does not cool down quickly. However, copper is converted to basic copper carbonate [Cu ₂ (OH) ₂ CO ₃ ] by moisture and carbon dioxide gas in the air, which is toxic to the human body.

Aluminum, which is widely used, is widely used in cooking utensils because it is light and easy to use and has good thermal conductivity. In addition, the surface is naturally oxidized in the air to generate a transparent oxide film, the oxide film has the advantage of preventing the progress of corrosion by protecting the surface. However, such a common cooking container has a problem that the food easily burns due to high heat in a state where the food is not evenly cooked. In addition, when the grease is pressed on the container, the cleaning becomes inconvenient, which causes hygiene problems at the same time. In the bakery mold, the bread is not separated from the mold due to the pressing part, and the surface of the bread is damaged during the separation process, making the bakery mold unsuitable for use.

In order to overcome these problems, many kitchen containers with enamel, ceramic, or Teflon coating have recently appeared. Enamel is glazed at 800 ~ 900 ℃ by applying glaze on the surface of steel sheet more than 2 times to make up for iron rust defect. Ceramic is a general term for heat-resistant nonmetal made by high temperature treatment, and it is good for high temperature and excellent corrosion resistance. Teflon is a fluorocarbon trademark registered by Dr. Planck of DuPont, USA, in 1938. But now it is a common noun and is widely used under the name Teflon. Teflon coating refers to a method of forming an inert hard coating layer by coating a fluorine resin, spraying an appropriate amount on a surface like paint, and then heating and firing at a constant temperature. Coating materials can be coated on any metal, glass or even ceramic surface. According to the coating method, conventional liquid spraying, electrostatic spraying, dipspin coating, etc. are commonly used. Hot flocking, coil coating, Special coating methods such as roller coating, fluidized bed and arc spray are also used.

In addition, one-coat, two-coat, and three-coat are common depending on the number of coatings, and multiple-coat may be performed for a thick coating. Teflon coating in this way is excellent in nonstick, low coefficient friction, non-wetting, heat resistance (heat resistance). Teflon coatings are divided into various names according to their characteristics, including PTFE (Poly Tetra Fluoro Ethylene), Fluorinated Ethylene Propylene Copolymer (FEP), Perfluoroalkoxy (PFA), Ethylene + Tetrafluoroethylene (ETFE), SILVER-STONE, and TEFZEL-S. . Teflon coating is particularly used as a food container, such as a variety of containers used in kitchen containers or baking trays, ice cream, sugar, confectionery, meat, flour, etc., because of excellent non-tackiness and heat resistance.

Teflon-coated vessels are non-tacky, which prevents food materials from sticking to the cooking vessel even when heated on fire. Water and oil do not adhere well to the coating surface, making them easy to clean and automatically clean. In addition, below 205 ° C., the coating surface is not decomposed. However, Teflon not only has a large difference in thermal expansion coefficient with a metal, but also has low adhesiveness and a wettability due to a low contact angle of 104 °. In addition, it is fired after application and thermally cured, so it is low in ductility and deteriorated by repeated heating, and peels off from the surface when an external impact is applied. In particular, when scratching the surface with a metallic material such as a spoon (spoon) or a spatula (spatula) is still uncomfortable to the user because the coating layer deteriorated adhesion easily peeled off and does not function properly.

Some of these patents propose various methods to solve the above problems.

In Korean Utility Model Publication No. 2000-0018556, a plurality of protrusions are formed on the surface of a cast iron plate, and (a) nickel-chromium plating layer, (b) ceramic coating layer, and (c) teflon coating layer. It consists of roasting. Here, the nickel-chromium layer provides corrosion resistance to the roasting of the cast iron material, softens meat quality by dissipating far infrared rays by the ceramic coating layer, and sterilizes toxicity and toxins inherent in meat and various foods, and is a Teflon coating layer. When cooked and eaten various foods do not stick or stick. However, this method causes the Teflon layer to harden during repeated heating and cooling processes, thereby causing the elasticity to deteriorate, causing the coating layer to peel off as the material structure begins to separate from other bonding layers. Therefore, Teflon, which is used as a tape, performs plasma etching, argon ion beam etching, etc. to increase adhesion, but it is not applicable when applied on a metal coating layer as in the present invention.

Korean Patent Laid-Open Publication No. 2000-0058726 relates to a lightweight frying pan as a kitchenware and a method for manufacturing the same. A protective coating on a frying pan by a method of plasma spraying using stainless steel, titanium, copper, aluminum, and manganese by die-casting magnesium alloy. It relates to a method of forming a light frying pan.

The present invention introduces a light frying pan in which die-cast cast magnesium alloy material is sandblasted and pickled, plasma sprayed, coated with two stages of Teflon, and finished with a protective coating layer. However, this method does not solve the problem that the durability of the coating layer is degraded due to repeated thermal fatigue of Teflon, but the separation occurs in the bonding layer, although the durability is slightly increased.

Korean Utility Model Registration No. 297,924 discloses an enamel coating layer by coating a glass glaze processed with far-infrared rays, bio, ceramics, etc. on the inner and outer surfaces of a metal container in various cooking containers such as a frying pan or a pot. It characterized in that to form a Teflon coating layer using a fluorine carbide on the cooking surface of the container. This devise is a cooking container through which the surface of the cooking container does not adhere to oil residues or foreign matters so that it is easy to clean and evenly cooks the inside of the cooking container so that it does not burn.

U.S. Patent Nos. 3,983,275, and 3,393,086 describe techniques for enhancing the heat resistance of crystal structures by applying enamel coating or ceramic coating to glaze aluminum alloy surfaces. However, this method solves the problem that the enamel layer is glass-amorphous and thus separates the crystal structure between the metal container and the Teflon layer, but the thermal expansion rate of the enamel layer is significantly different from that of the metal material. There is a problem that is easily broken due to cracks and brittleness.

Japanese Patent Application Laid-Open No. 08-173321 is an invention for a cooking vessel having a low friction coefficient layer having excellent durability due to its high wear resistance and heat resistance, and not to stick well to the cooking vessel surface. A DLC layer containing 0.05-20 vol% of the fluororesin layer was formed in the A-C, to ensure good bonding between the amorphous layer and the crystalline layer. The present invention is a method for the fluororesin to adhere well to the metal container through the DLC, while the DLC is formed of a thin film of 2 ~ 3㎛ below the limit of the DLC layer thickness, while excellent in the thermal conductivity and wear resistance It is very finely formed and has a problem of being easily peeled off by external impact.

Therefore, an object of the present invention is to solve the above problems, by providing a container applying the advantages of the amorphous material excellent in corrosion resistance, toughness, bonding properties, by automatically forming irregularities during the thermal spray coating process, and the good adhesion with the Teflon coating layer It is to provide a cooking container in which the durability of the cooking container is improved. In addition, the three-layer composite layer of metal, amorphous, and Teflon provides a cooking vessel that prevents the thermal conductivity from sticking to the bottom surface due to the rapid thermal conduction of metal>amorphous> teflon.

A feature of the present invention for achieving the above object is in the inner surface of the pot, cooker, frying pan, grill and confectionery frame constituting the cooking vessel with metal,

The inner surface of the cooking vessel is thermally coated with an amorphous material to clean the surface, and then dried to roughen the surface by sand blasting, etc., and then coated with Teflon on the top to provide a cooking container having excellent wear resistance, corrosion resistance and durability.

And the amorphous water is composed of Cr 40.0 ~ 50.0%, B 2.5 ~ 6.5%, Si 0.5 ~ 5.0% by weight, C 0.0 ~ 0.5% and Mn, Ni, Mo, Cu, Ti, V, Zr, Nb , Hf, Ta, W composition is added alone or in combination of 0.0 to 5.0%, the remainder is composed of impurities inevitably contained with Fe.

Looking at each of the chemical components constituting the amorphous phase on the cooking vessel surface of the present invention in detail.

It is composed of Cr 40.0 ~ 50.0%, B 2.5 ~ 6.5%, Si 0.5 ~ 5.0% by weight, and C 0.0 ~ 0.5% and Ni, Mo, Cu, Ti, V, Zr, Nb, Hf, Ta, W The composition is added in an amount of 0.0 to 5.0% alone or in combination and the remainder is coated with a composition consisting of Fe and unavoidable impurities to have an amorphous phase. In addition, in the present invention, by spraying 0 to 40% of carbide particles such as WC, TiC, TaC to the thermal spraying material alone or in combination, forming an amorphous phase and a carbide mixed phase, and varying the shape of the container surface to add irregularities or gradients. It includes everything that loses.

In the present invention, Cr is an important element for improving corrosion resistance and abrasion resistance, and forms a phase corresponding to Fe and an intermetallic compound to facilitate formation of an amorphous phase during quenching. If it is less than 40.0%, the γ phase may appear, and if it is more than 50.0%, excess Cr may separate and interfere with the formation of the amorphous phase. Preferably, the composition of 43.0% to 46.0% makes it easy to obtain an amorphous phase.

B is the most important amorphous phase forming element in the present invention. It is an element that easily combines with Fe and Cr to form an intermetallic compound, and is well equipped with requirements for forming an amorphous phase. When the Fe-Cr alloy containing B is quenched during solidification, it does not form an intermetallic compound and transforms into an amorphous phase. However, at less than 2.5%, γFe or αFe may appear, which may interfere with amorphous phase formation. If the amount exceeds 6.5%, the excess B forms a weak intermetallic compound, so it is limited. Preferably, the composition is formed at 5.6 to 6.2% so that the amorphous phase is easily formed.

Si is added for the effect of enhancing the solid solution of the B and other elements as well as strengthening the matrix structure at the high temperature of the matrix solid solution and contact with oxygen generated during coating. If it is less than 0.5%, there is no effect, and in 5% or more, an (epsilon) phase and (eta) phase may appear, and it suppresses. Preferably, the composition of 1.75% to 2.25% is effective in forming an amorphous phase and strengthening the matrix and inhibiting oxidation.

C has the effect of strengthening the matrix structure and improving the abrasion resistance by making B, Cr and the like carbides, and can be added as needed. However, at 0.5% or higher, it may cause cracks during cooling after coating, so suppress it.

Mn, Ni, Mo, Ti, V, Zr, Nb, Hf, Ta, W combine with B or C to form carbohydrates to strengthen matrix structure, spalling, fitting, and chipping ( If necessary, it should be added below 5.0% due to the effect of increasing resistance to thermal fatigue such as chipping. If this is exceeded, there is an effect to harm the amorphous phase formation beyond the employment limit. Cu has an effect of lowering the alloy to lower the melting point to improve fusion and to improve the bonding property, and is added as necessary. However, exceeding 5% may limit segregation or corrosion resistance.

Hereinafter, an embodiment of the present invention will be described. However, the following examples do not limit the scope of the present invention.

Example

Square aluminum sheet of 10 mm in length by weight of Cr 45.2%, B 6.01%, Si 2.15%, Ni 0.10%, Mo 0.12%, C 0.07% The coating was sprayed on. The specimen was washed with a solvent or the like, dried and alumina sand blasted to obtain a surface roughness of about Rmax 1.5 microns. Thereafter, about 12% of the polymer mixed with 60% of PTFE and 40% of PFA by weight ratio, and the rest was applied by drying once with an aqueous primer solution composed of water and various additives. 40% PTFE, 20% PFA, 10% acrylic latex, and the final coating agent, which was composed of water and various additives, were applied to the finished product by spraying twice with a dry coating and then applied about 20 microns. The specimens in which these operations were completed were heated at 150 ° C. for 10 minutes, and then calcined by further heating at 415-430 ° C. for 3 minutes.

The coated specimen was placed in boiling water and heated for 20 minutes. The specimens were taken out, and three stainless steel chopsticks were tied together to the test rod, and the damage was visually distinguished by reciprocating the coating layer 20 times vertically. As a result, the product produced in the present invention has no phenomenon of peeling off while the teflon is pushed out, only the phenomenon of being crushed and dropped from the surface is found. However, after only sandblasting the aluminum plate, the comparative specimen coated with Teflon under the same conditions had a long peeling of the coating layer.

As described above, the present invention is an excellent cooking kitchen container that solves the problem that the surface is easily peeled off at a high temperature due to the excellent durability of the existing cooking kitchen container. The cooking container coated with the amorphous phase and the Teflon of the present invention has an effect of automatically increasing the bonding strength of the Teflon coating layer coated thereon due to the effect of increasing the adhesion between the irregularities and the amorphous phase by the amorphous coating layer and the durability of the cooking container is excellent. Appears. In addition, the three-layered composite layer that leads to metal, amorphous and Teflon solves the peeling problem caused by the low adhesion of Teflon, and the thermal conductivity of the amorphous layer corresponds to the middle of the metal container and Teflon so that the food is naturally heated evenly. It prevents the sticking partly.

Claims (2)

In the cooking container using a metal as a body, The cooking vessel characterized in that the thermal spray coating the amorphous material on the inner surface of the cooking vessel to clean the surface and then dried to roughen the surface by sand blasting and the like and then coated Teflon on the top. The method of claim 1, The amorphous material is composed of Cr 40.0-50.0% by weight, B 2.5-6.5%, Si 0.5-5.0%, C 0.5% or less and Mn, Ni, Mo, Cu, Ti, V, Zr, Nb, Hf And at least one of Ta, W, and at least 5.0% of the composition, the remainder of which is composed of Fe and inevitable impurities.