TR2021014303A2 - Flux Composition for Copper Based Alloys - Google Patents

Abstract

The invention was developed to improve the casting quality of copper-based alloys, potassium aluminum fluoride (KAlF4), calcium fluoride (CaF2), sodium fluoride (NaF), borax pentahydrate (Na2B4O7.5 H2O), fine perlite, sodium carbonate (Na2CO3), sodium chloride. (NaCl), potassium chloride (KCl) and graphite (C) containing flux (flux) composition and production method.

Description

DESCRIPTION Flux Composition for Copper Based Alloys Technical Area The invention is used in the non-ferrous industry, in the copper and copper alloys industry, in copper-based It is related to flux used in casting of alloys.

In particular, the invention is aimed at improving the melting process of copper-based alloys, molten liquid and With the developed flux composition and production method to increase the casting quality. State of the Art Fluxes, powder, granules etc. in the form of oxidized compounds in the liquid metal, removal of impurities, unwanted elements from the liquid metal bath, casting gas by turning it into a suitable clean melt and also cutting off its contact with the atmosphere. Casting chemicals used to prevent The liquid metal in the crucible It is applied as a cover over it. Cleaning, covering, impurity removal Different types of fluxes are available to remove inclusions and slag.

Today, foundry enterprises operate on chemical, physical and mechanical It uses more fluxing processes to ensure the properties. Your businesses Melting is widely used commercially to reduce casting costs and improve casting quality. Many fluxes are available in the market. Fluxes are basically either carbon-based; coal, graphite, This type of fluxes are added to the melting furnace with charge; creates an inert atmosphere on the liquid surface, protects the furnace refractory, prevents oxidation, prevents heat losses on the molten liquid surface, flocculating (agglomerating) impurities and removing slag, and fine materials They work as preservatives during melting.

Copper-based alloys that come into contact with oxygen in the atmosphere during the melting process such as beryllium, zirconium, phosphorus, iron, zinc, silicon, aluminum, manganese in Due to the high affinity of the elements for oxygen, the liquid metal tends to be oxidized.

If these oxides are present in the environment during melt solidification, the grain boundaries They deteriorate the mechanical properties by segregating throughout. Molten metal during casting Recycling materials such as refractory materials, scrap, sawdust after processing materials and waste materials from the previous casting are included. all this materials and environment contaminate the liquid metal. This is after casting hydrogen, carbon and oxygen based gas space, porosity, inclusion, impurity in materials such as melting and casting errors.

Fluxes used for copper-based materials in the current technique have a high melting point. It accelerates the melting of metals such as iron, manganese, chromium, nickel in liquid metal and slag (impurities accumulating on the surface) cleaning processes in liquid metal it provides. However, in the application process of currently used fluxes, the liquid metal their performance in acting as a cover that cuts off contact with air has been found to be low. At the same time, the cost of these fluxes is high. Value added It also increases the costs of high casting processes.

As a result, due to the above-mentioned negativities and existing solutions It is necessary to make an improvement in the relevant technical field due to the inadequacy of the is locked.

Brief Description of the Invention The present invention satisfies the above-mentioned requirements, eliminates all disadvantages. flux composition for copper-based alloys that lift and related to the production method.

The primary aim of the invention is to provide chemical ingredients in the flux composition. A flux developed to increase the casting quality of copper-based alloys. presenting the composition.

It is an object of the invention to find the fluxes in its content compared to fluxes in the art. In addition to its slag cleaning feature thanks to chemicals, the liquid metal in the crucible It also acts as a cover on the liquid metal to cut the relationship with the air.

Another object of the invention is to transfer liquid metal together with metals with high melting point. is to accelerate the melting process of metals by feeding.

Another object of the invention is to remove the slag accumulated in the linings of induction furnaces over time. Preventing impurities from entering the liquid metal by showing the cleaning feature. it is to provide.

One aim of the invention is to reduce the flux costs thanks to its improved composition and to provide competitive advantage to its competitors. It offers a flux that provides a cost advantage compared to

In order to fulfill the above-mentioned purposes and to provide the mentioned features, The invention is used in the casting of copper-based alloys to improve casting quality. It is a flux composition developed and contains borax pentahydrate, fine perlite, sodium carbonate, It contains sodium chloride, potassium chloride and graphite.

According to one embodiment of the invention, the flux composition for copper-based alloys is the total 30-60% potassium aluminum fluoride, 10-35% calcium by weight of the content fluoride, 10-25% sodium fluoride, 2-10% borax pentahydrate, 1-5% fine perlite, 1-5% sodium carbonate, 1-10% sodium chloride, To fulfill the above-described purposes, the invention is based on flux for copper-based alloys. is the production method of the composition, I. Preparation of chemicals for the mixture, ii. Potassium aluminum fluoride, calcium fluoride, sodium fluoride, borax pentahydrate, Powder mixer of fine perlite, sodium carbonate, sodium chloride and potassium chloride adding it to the machine and mixing the mixture until homogeneous, iii. (ii) The last addition of graphite to the mixture prepared in step, iv. Mixing the mixture until it is homogeneous, The structural and characteristic features of the invention and all its advantages are detailed below. will be more clearly understood by the explanation and therefore this should be made taking into account the detailed explanation.

Detailed Description of the Invention In this detailed description, flux composition and production method and preferred configurations only serve to a better understanding of the subject. It is disclosed as intended and without any limiting effect.

The invention is a flux developed to improve the casting quality of copper-based alloys. its composition and production method.

For the subject of the invention copper-based alloys, the flux composition in its most basic form; potassium aluminum fluoride (KAlF4), calcium fluoride (C8F2), sodium fluoride (NaF), borax pentahydrate (Na2B407.5 H20), fine perlite, sodium carbonate (Nazcog), sodium chloride (NaCl), potassium chloride (KCl) and graphite (C).

Fine perlite, graphite, borax pentahydrate, sodium in the flux composition of the invention. Thanks to carbonate, sodium chloride and potassium chloride, compared to the fluxes currently used performance features have been improved. Apart from the flux slag cleaner feature, which is the subject of the invention It also acts as a cover on the liquid metal in the crucible, and the relationship of the liquid metal with the air. is cutting. By feeding the liquid metal together with metals with high melting point, speeds up the melting process. It is also used in the linings of induction cookers. It shows the ability to clean the slag accumulated over time, allowing the impurities into the liquid metal. prevents it from entering.

Table 1 shows the flux composition for the copper-based alloys of the invention. contents and approximate proportions of these contents are given.

Table 1: The content of the flux composition and the ratios that make up this content by weight by weight Preferred KII I 'I M'k Content Amount Potassium aluminum fluoride 30 30-60 Calcium fluoride 25 10-35 Sodium fluoride 25 10-25 Borax pentahydrate 2 2-10 fine perlite 3 1-5 Sodium carbonate (mild soda) 5 1-5 Sodium chloride 5 1-10 Potassium chloride 3 1-10 Graphite 2 0.5-3 Potassium aluminum fluoride is an exothermic reaction powder as well as slag removal It also has a feature.

Calcium fluoride adds fluidity to the slag, saves energy as it conducts heat transfer quickly. it provides. It helps impurities to pass easily to slag. Addition to iron As a result, it facilitates melting and prevents unwanted materials from remaining in the slag. it provides.

When sodium fluoride is added to the molten metal, it causes deoxidation or removal of the gas from the molten metal. It helps to expel, it is also used in the melting of light metals.

Borax pentahydrate is smooth, sticky, protective, clean and burr-free at high temperatures. a protective slag in the non-ferrous metal industry, thanks to its liquid-forming property It is used as a cleaner and melting accelerator.

Fine perlite prevents surface tensions by providing balanced cooling of the metal. Liquid By providing the collection of dispersed slag formed on the surface without reacting with the metal. It ensures a clean casting.

Sodium carbonate (mild soda) with its low reactivity and low melting temperature, silica and It is a solvent for other oxides. Low temperature melting of all components. it provides.

Sodium chloride gives fluidity to the liquid metal. The slag remaining on the crucible wall It helps to dissolve. With air forming a thin layer on the liquid It helps to cut contact.

Potassium chloride gives fluidity to the liquid metal. The slag remaining on the crucible wall It helps to dissolve. With air forming a thin layer on the liquid It helps to cut contact.

Graphite acts as a cover by throwing it on the liquid metal to cut off the contact with the atmosphere. sees.

The production method of the flux composition, which is the subject of the invention, in its most basic form; I. Preparation of chemicals for the mixture, ii. Potassium aluminum fluoride, calcium fluoride, sodium fluoride, borax pentahydrate, Powder mixer of fine perlite, sodium carbonate, sodium chloride and potassium chloride adding it to the machine and mixing the mixture until homogeneous, iii. (ii) The last addition of graphite to the mixture prepared in step, iv. Mixing the mixture until it is homogeneous, For the powder mixture to be prepared, it is necessary to prepare the chemicals at room temperature in general. then all chemicals (regardless of the order of addition) except graphite powder mixer By adding it to the machine, a homogeneous mixture is obtained between 1 and 5 minutes (in the ii process step). is mixed until it is done. Graphite is added last and the mixture is mixed for another 1-2 minutes. It is mixed (in the iv process step) and the prepared homogeneous mixture is ready for use. are brought and filled into plastic containers for storage purposes.

In the powder mixer machine, the mixing time of powder materials is between 1 and 5 minutes. it has to be. If the time is longer, the grain sizes of the dust particles becomes small and this is undesirable. For flux powder size, agglomeration as it gets smaller Since the driving force will be greater, good opacity on the liquid metal surface cannot provide. The powder size of the flux of the invention is in the range of 100-200 µm.

Graphite should be added last to the powder mixture. Because of the color of the graphite, at the beginning of the process The mixture quickly becomes homogeneous, changing the color of the flux. gives view. This can be misleading for a healthy mix.

Oxygen in liquid metal during casting using oxygen and hydrogen analyzer and the hydrogen ratio was measured. Castings using commercial fluxes Oxygen ratio is 10-50 in the castings made using the flux composition which is the subject of the invention. ppm, hydrogen ratio is in the order of 1-5 ppm.

Since the flux preparation process is an exothermic reaction, heat is released. For this reason, the person making the application should take precautions against the heat in terms of occupational safety. required.

The subject of the invention is flux composition, copper and copper alloys in the non-ferrous sector. It is used in the casting of copper-based alloys in the industry. Find out in Table 2 copper and copper alloys in which the flux composition can be used with UNS codes is given.

Claims (5)

REQUESTS . It is a flux composition developed to increase the casting quality to be used in the casting of copper-based alloys. It contains borax pentahydrate, fine perlite, sodium carbonate, sodium chloride, potassium chloride and graphite. . It is a flux composition for copper-based alloys according to claim 1 or 2, and its feature is; 30-60% potassium aluminum fluoride, 10-35% calcium fluoride, 10-25% sodium fluoride, 2-10% borax pentahydrate, 1-5% fine perlite, 1-5% sodium carbonate, by weight 1-10 sodium chloride, . It is a flux composition for copper-based alloys according to claim 1 or 2, and its feature is; 30% by weight potassium aluminum fluoride, 25% calcium fluoride, 25% sodium fluoride, 2% borax pentahydrate, 3% fine perlite, 5% sodium carbonate, 5% sodium chloride, 3% potassium chloride and It contains 2% graphite. . It is the production method of flux composition for copper-based alloys, and its feature is; I. Preparation of chemicals for the mixture, ii. Adding potassium aluminum fluoride, calcium fluoride, sodium fluoride, borax pentahydrate, fine perlite, sodium carbonate, sodium chloride and potassium chloride to the powder mixer machine and mixing the mixture until homogeneous, iii. (ii) adding graphite to the mixture prepared in step iv. Mixing the mixture until it is homogeneous, includes the processing steps. 5. It is the production method of flux composition for copper based alloys according to claim 5, its feature is; (ii) mixing the powder mixture for 1-5 minutes during the production phase.