Preparation method of selenium-rich health-care pot and selenium-rich health-care pot

Abstract

A method for preparing a selenium-enriched health-preserving pot and the pot itself, comprising the following steps: S1, copper alloy powder preparation: adding 90-95% Cu, 0-5% Al, 0-3% Mg, and 0-2% Si to a water-gas combined atomization powder-making furnace to obtain copper alloy powder with a d50 of 5-20 micrometers; S2, selenium powder preparation: selecting selenium powder with a d50 of 3-10 micrometers; S3, SiC powder preparation: selecting silicon carbide powder with a d50 of 5-20 micrometers; S4, mixing: mixing 30%-80% copper alloy powder, 0.1%-4.0% selenium powder, and 20% SiC powder. S5. Spray granulation: Add the composite material to a 5% PVA solution and stir thoroughly for 2-3 hours to obtain a slurry; feed the slurry into a spray granulator to obtain powder particles with a d50 of 100-120 micrometers; S6. Hot pressing sintering: Load the granulated composite material into a pot-shaped mold and place it into a hot pressing sintering furnace to obtain the pot body; This invention uses powder metallurgy hot pressing sintering to prepare a SiC / Cu composite selenium-enriched health pot, which simplifies the process and reduces costs; moreover, the selenium-enriched health pot can continuously release selenium to supplement the body's needs, meeting health requirements.

Description

Technical Field

[0001] This invention relates to the field of health-preserving pot technology, and in particular to a method for preparing a selenium-enriched health-preserving pot and the selenium-enriched health-preserving pot itself. Background Technology

[0002] A pot is a common kitchen utensil used for cooking, boiling, frying, stir-frying, and other tasks. It is an indispensable tool in Chinese cooking. As people pay more and more attention to health issues, they also place higher demands on the health benefits of pots.

[0003] Selenium is an essential trace element for the human body. It is known for its immune-boosting properties and is hailed as the "king of cancer prevention," attracting widespread attention. Currently, the Chinese Nutrition Society recommends an adult selenium intake of 50-250 micrograms per day, with a recommended intake of 50 micrograms per day for those over 18 years old, an adequate intake of 100 micrograms per day, and a tolerable upper intake level of 400 micrograms per day. Given my country's vast territory and the selenium-deficient regions, coupled with increasingly in-depth research into the importance of selenium in the human body, there is an urgent need for safe and efficient methods of selenium supplementation. Therefore, the inventors have developed a selenium-enriched health-preserving pot that continuously releases selenium into food while cooking, effectively addressing this problem.

[0004] Moreover, the existing method for preparing pots is powder metallurgy, which is complicated and costly, and the resulting pots have low strength and thermal conductivity. Therefore, the inventors propose an improvement to the preparation method of selenium-enriched health pots. Summary of the Invention

[0005] The purpose of this invention is to provide a method for preparing a selenium-enriched health pot and the pot itself. The selenium-enriched health pot is prepared using a powder metallurgy hot pressing sintering method to simplify the process, reduce equipment investment and usage, and reduce costs. Moreover, the selenium-enriched health pot can continuously release selenium to supplement the body's needs, meeting health requirements. It also has a good thermal conductivity, resulting in rapid and uniform heating.

[0006] To achieve the above objectives, the solution of the present invention is:

[0007] A method for preparing a selenium-enriched health-preserving hot pot includes the following steps:

[0008] S1. Preparation of copper alloy powder: Cu, Al, Mg, and Si are added to a water-gas combined atomization powder-making furnace according to the copper alloy powder formula. After melting, water-gas combined atomization, filtration, drying, and sieving, copper alloy powder with a d50 of 5-20 micrometers is obtained. The components and volume percentages in the copper alloy powder formula are: Cu 90-95%, Al 0-5%, Si 0-2%, Mg 0-3%.

[0009] S2. Selenium powder preparation: Select selenium powder with a d50 of 3-10 micrometers;

[0010] Preparation of S3 and SiC powders: Silicon carbide powder with a d50 of 5-20 micrometers was selected;

[0011] S4. Mixing: Mix the copper alloy powder, selenium powder, and SiC powder according to the formula ratio; load the mixed powder into a ball mill jar with a ball-to-powder ratio of 2.5:1, a rotation speed of 260 r / min, and ball mill for 8 hours to fully mix and homogenize into a composite material; wherein, the components and volume percentages of the composite material are: SiC powder 20%-65%; copper alloy powder 30%-80%; selenium powder 0.1-4.0%;

[0012] S5. Spray granulation: Add the above-mixed composite material to a 5% PVA solution and stir thoroughly for 2-3 hours to obtain a slurry; feed the slurry into a spray granulator to obtain powder particles with a d50 of 100-120 micrometers.

[0013] S6. Hot pressing sintering: The granulated composite material is loaded into a pot-shaped mold and placed in a hot pressing sintering furnace. The pressure is 20-100MPa and the temperature is 800-1000℃. The pot body is obtained in 5-10 minutes.

[0014] The selenium powder is pure selenium powder or selenium alloy powder, wherein the selenium alloy powder contains 40-60% Cu and 40-60% Se.

[0015] A method for preparing a selenium-enriched health-preserving hot pot includes the following steps:

[0016] S1. Preparation of copper alloy powder: Cu, Al, Mg and Si are added to a water-gas combined atomization powder making furnace according to the copper alloy powder formula. After melting, water-gas combined atomization, filtration, drying and sieving, copper alloy powder with d50 of 5 micrometers is obtained. The components and volume percentages in the copper alloy powder formula are: Al 2%, Si 1%, Mg 3%, and the balance is Cu.

[0017] S2. Selenium powder preparation: Pure selenium powder with a d50 of 3 micrometers is selected;

[0018] Preparation of S3 and SiC powders: Silicon carbide powder with a d50 of 5 micrometers was selected;

[0019] S4. Mixing: Mix the copper alloy powder, selenium powder, and SiC powder according to the formula ratio; load the mixed powder into a ball mill jar with a ball-to-powder ratio of 2.5:1, a rotation speed of 260 r / min, and ball mill for 8 hours to fully mix and homogenize into a composite material; wherein, the components and volume percentages of the composite material are: SiC powder 20%; copper alloy powder 79.9%; selenium powder 0.1%;

[0020] S5. Spray granulation: Add the above-mixed composite material to a 5% PVA concentration and stir thoroughly for 2-3 hours to obtain a slurry; feed the slurry into a spray granulator to obtain powder particles with a d50 of 100-120 micrometers.

[0021] S6. Hot pressing sintering: The granulated composite material is loaded into a pot-shaped mold, placed in a hot pressing sintering furnace, with a pressure of 20MPa and a temperature of 960℃, and held for 5 minutes. The pot body is then demolded.

[0022] A method for preparing a selenium-enriched health-preserving hot pot includes the following steps:

[0023] S1. Preparation of copper alloy powder: Cu, Al, Mg, and Si are added to a water-gas combined atomization powder making furnace according to the copper alloy powder formula. After melting, water-gas combined atomization, filtration, drying, and sieving, copper alloy powder with a d50 of about 15 micrometers is obtained. The components and volume percentages in the copper alloy powder formula are: Al 2%, Si 2%, Mg 3%, and the balance is Cu.

[0024] S2. Selenium powder preparation: Pure selenium powder with a d50 of 7.5 micrometers is selected;

[0025] Preparation of S3 and SiC powders: Silicon carbide powder with a d50 of 10 micrometers was selected;

[0026] S4. Mixing: Mix the copper alloy powder, selenium powder, and SiC powder according to the formula ratio; load the mixed powder into a ball mill jar, with a ball-to-powder ratio of 2.5:1, a rotation speed of 260 r / min, and ball mill for 8 hours to fully mix and homogenize into a composite material; wherein, the components and volume percentages of the composite material are: SiC powder 34%; copper alloy powder 65.9%; selenium powder 0.1%;

[0027] S5. Spray granulation: Add the above-mixed composite material to a 5% PVA concentration and stir thoroughly for 2-3 hours to obtain a slurry; feed the slurry into a spray granulator to obtain powder particles with a d50 of 100-120 micrometers.

[0028] S6. Hot pressing sintering: The granulated composite material is loaded into a pot-shaped mold, placed in a hot pressing sintering furnace, with a pressure of 20MPa and a temperature of 880℃, and held for 8 minutes. The pot body is then demolded.

[0029] A method for preparing a selenium-enriched health-preserving hot pot includes the following steps:

[0030] S1. Preparation of copper alloy powder: Cu, Al, Mg, and Si are added to a water-gas combined atomization powder making furnace according to the copper alloy powder formula. After melting, water-gas combined atomization, filtration, drying, and sieving, copper alloy powder with a d50 of about 20 micrometers is obtained. The components and volume percentages in the copper alloy powder formula are: Al 2%, Si 2%, Mg 1%, and the balance is Cu.

[0031] S2. Selenium powder preparation: Pure selenium powder with a d50 of 10 micrometers is selected;

[0032] Preparation of S3 and SiC powders: Silicon carbide powder with a d50 of 20 micrometers was selected;

[0033] S4. Mixing: Mix the copper alloy powder, selenium powder, and SiC powder according to the formula ratio; load the mixed powder into a ball mill jar with a ball-to-powder ratio of 2.5:1, a rotation speed of 260 r / min, and ball mill for 8 hours to fully mix and homogenize into a composite material; wherein, the components and volume percentages of the composite material are: SiC powder 65%; copper alloy powder 34.9%; selenium powder 0.1%;

[0034] S5. Spray granulation: Add the above-mixed composite material to a 5% PVA concentration and stir thoroughly for 2-3 hours to obtain a slurry; feed the slurry into a spray granulator to obtain powder particles with a d50 of 100-120 micrometers.

[0035] S6. Hot pressing sintering: The granulated composite material is loaded into a pot-shaped mold, placed in a hot pressing sintering furnace, with a pressure of 20MPa and a temperature of 800℃, and held for 10 minutes. The pot body is then demolded.

[0036] A method for preparing a selenium-enriched health-preserving hot pot includes the following steps:

[0037] S1. Preparation of copper alloy powder: Cu, Al, Mg, and Si are added to a water-gas combined atomization powder making furnace according to the copper alloy powder formula. After melting, water-gas combined atomization, filtration, drying, and sieving, copper alloy powder with a d50 of about 7.5 micrometers is obtained. The components and volume percentages in the copper alloy powder formula are: Al 2%, Si 2%, Mg 3%, and the balance is Cu.

[0038] S2. Selenium powder preparation: Pure selenium powder with a d50 of 3 micrometers is selected;

[0039] Preparation of S3 and SiC powders: Silicon carbide powder with a d50 of 14 micrometers was selected;

[0040] S4. Mixing: Mix the copper alloy powder, selenium powder, and SiC powder according to the formula ratio; load the mixed powder into a ball mill jar with a ball-to-powder ratio of 2.5:1, a rotation speed of 260 r / min, and ball mill for 8 hours to fully mix and homogenize into a composite material; wherein, the components and volume percentages of the composite material are: SiC powder 40%; copper alloy powder 59%; selenium powder 1.0%;

[0041] S5. Spray granulation: Add the above-mixed composite material to a 5% PVA concentration and stir thoroughly for 2-3 hours to obtain a slurry; feed the slurry into a spray granulator to obtain powder particles with a d50 of 100-120 micrometers.

[0042] S6. Hot pressing sintering: The granulated composite material is loaded into a pot-shaped mold, placed in a hot pressing sintering furnace, with a pressure of 20MPa and a temperature of 950℃, and held for 5 minutes. The pot body is then demolded.

[0043] A method for preparing a selenium-enriched health-preserving hot pot includes the following steps:

[0044] S1. Preparation of copper alloy powder: Cu, Al, Mg, and Si are added to a water-gas combined atomization powder making furnace according to the copper alloy powder formula. After melting, water-gas combined atomization, filtration, drying, and sieving, copper alloy powder with a d50 of about 7.5 micrometers is obtained. The components and volume percentages in the copper alloy powder formula are: Al 2%, Si 2%, Mg 3%, and the balance is Cu.

[0045] S2. Selenium powder preparation: Pure selenium powder with a d50 of 3 micrometers is selected;

[0046] Preparation of S3 and SiC powders: Silicon carbide powder with a d50 of 14 micrometers was selected;

[0047] S4. Mixing: Mix the copper alloy powder, selenium powder, and SiC powder according to the formula ratio; load the mixed powder into a ball mill jar with a ball-to-powder ratio of 2.5:1, a rotation speed of 260 r / min, and ball mill for 8 hours to fully mix and homogenize into a composite material; wherein, the components and volume percentages of the composite material are: SiC powder 40%; copper alloy powder 56%; selenium powder 4.0%;

[0048] S5. Spray granulation: Add the above-mixed composite material to a 5% PVA concentration and stir thoroughly for 2-3 hours to obtain a slurry; feed the slurry into a spray granulator to obtain powder particles with a d50 of 100-120 micrometers.

[0049] S6. Hot pressing sintering: The granulated composite material is loaded into a pot-shaped mold, placed in a hot pressing sintering furnace, with a pressure of 20MPa and a temperature of 950℃, and held for 5 minutes. The pot body is then demolded.

[0050] The volume percentage of copper alloy powder in the composite material is 50%-70%, and the volume percentage of SiC powder in the composite material is 30%-65%.

[0051] The copper alloy powder contains 2% Si and 2% Mg.

[0052] A selenium-enriched health pot, wherein the selenium-enriched health pot is made by the preparation method of the selenium-enriched health pot.

[0053] The selenium-enriched health pot of this invention is prepared by using a powder metallurgy hot-pressing sintering method to prepare a SiC / Cu composite selenium-enriched health pot. Hot-pressing sintering introduces pressure instead of the traditional powder metallurgy method, simplifying the process and reducing equipment investment and usage. Furthermore, the hot-pressing powder metallurgy process yields a uniform and dense pot body with a density exceeding 99%. Compared to casting or injection molding, this method uses simpler equipment, has a shorter process flow, lower sintering temperature, and shorter holding time. The selenium-enriched health pot exhibits high strength and thermal conductivity, and is cost-effective. Moreover, when heated in water, the selenium-enriched health pot of this invention releases 50-150 μg / kg of selenium with very low solubility but stability, supplementing the selenium needed by the human body and meeting health requirements. Additionally, both Cu and silicon carbide have high thermal conductivity; combining them can produce a high thermal conductivity composite material, easily reaching 100 W / mK, much higher than that of ordinary iron or steel pots, resulting in rapid and uniform heat transfer. This helps maintain the original nutrients of food while enhancing its flavor.

[0054] This invention relates to a selenium-enriched health pot, a high-end health pot that features efficient heating, rapid and even heat transfer, and continuous release of selenium into food. Compared with existing health pots, this invention has the following advantages:

[0055] 1. The composite material of this invention contains selenium powder. Selenium is slightly soluble in water. The selenium-enriched health pot contains a certain amount of selenium. When heated, it can release a concentration of 50-150 μg / kg of selenium in water. The solubility is very small but stable. During the heating process of food in the pot, it can continuously and stably release selenium ions that are beneficial to the human body. It is a selenium-enriched health pot with health care effects.

[0056] 2. Both Cu and silicon carbide in the composite material of this invention have high thermal conductivity. The pot body is prepared using copper alloy powder and silicon carbide powder. The thermal conductivity of the health pot can be adjusted to 100-200 W / mk (room temperature), and the composition and structure can be controlled, which is beneficial to the control of material properties and makes it easy to obtain a pot body with high thermal conductivity and high strength. The thermal conductivity can easily reach 100 W / mk, which is much higher than that of ordinary iron pots and steel pots. It has fast heat transfer, can heat quickly and evenly, is safe, efficient and energy-saving.

[0057] 3. This invention uses a powder metallurgy hot pressing sintering method to prepare a SiC / Cu composite selenium-enriched health pot. Hot pressing sintering introduces pressure to replace the traditional powder metallurgy method, simplifying the process and reducing equipment investment and usage. Moreover, the hot pressing powder metallurgy preparation process can obtain a uniform and dense pot body with a density of over 99%. Compared with casting or injection molding, the equipment is simple, the process flow is short, the sintering temperature is low, the holding time is short, the selenium-enriched health pot has high strength and thermal conductivity, and the cost is low. Detailed Implementation

[0058] To further explain the technical solution of the present invention, the present invention will be described in detail below through specific embodiments.

[0059] This invention discloses a method for preparing a selenium-enriched health-preserving pot, comprising the following steps:

[0060] S1. Preparation of copper alloy powder: Cu, Al, Mg, Si, and other substances are added to a water-air combined atomization powder-making furnace according to the copper alloy powder formula. After melting, water-air combined atomization, filtration, drying, and sieving, copper alloy powder with a d50 of 5-20 micrometers is obtained. The components and volume percentages in the copper alloy powder formula are: Cu 90-95%, Al 0-5%, Si 0-2%, Mg 0-3%.

[0061] S2. Selenium powder preparation: Select selenium powder with a d50 of 3-10 micrometers;

[0062] Preparation of S3 and SiC powders: Silicon carbide powder with a d50 of 5-20 micrometers was selected;

[0063] S4. Mixing: Mix the copper alloy powder, selenium powder, and SiC powder according to the formula ratio; load the mixed powder into a ball mill jar with a ball-to-powder ratio of 2.5:1, a rotation speed of 260 r / min, and ball mill for 8 hours to fully mix and homogenize into a composite material; wherein, the components and volume percentages of the composite material are: SiC powder 20%-65%; copper alloy powder 30%-80%; selenium powder 0.1-4.0%;

[0064] S5. Spray granulation: Add the above-mixed composite material to a 5% PVA solution and stir thoroughly for 2-3 hours to obtain a slurry; feed the slurry into a spray granulator to obtain powder particles with a d50 of approximately 100-120 micrometers.

[0065] S6. Hot pressing sintering: The granulated composite material is loaded into a pot-shaped mold and placed in a hot pressing sintering furnace. The pressure is 20-100MPa and the temperature is 800-1000℃. The pot body is obtained in 5-10 minutes.

[0066] The selenium-enriched health pot of this invention is prepared by using a powder metallurgy hot-pressing sintering method to prepare a SiC / Cu composite selenium-enriched health pot. Hot-pressing sintering introduces pressure instead of the traditional powder metallurgy method, simplifying the process and reducing equipment investment and usage. Furthermore, the hot-pressing powder metallurgy process yields a uniform and dense pot body with a density exceeding 99%. Compared to casting or injection molding, this method uses simpler equipment, has a shorter process flow, lower sintering temperature, and shorter holding time. The selenium-enriched health pot exhibits high strength and thermal conductivity, and is cost-effective. Moreover, when heated in water, the selenium-enriched health pot of this invention releases 50-150 μg / kg of selenium with very low solubility but stability, supplementing the selenium needed by the human body and meeting health requirements. Additionally, both Cu and silicon carbide have high thermal conductivity; combining them can produce a high thermal conductivity composite material, easily reaching 100 W / mK, much higher than that of ordinary iron or steel pots, resulting in rapid and uniform heat transfer. This helps maintain the original nutrients of food while enhancing its flavor.

[0067] The selenium powder of the present invention is pure selenium powder or selenium alloy powder, wherein the selenium alloy powder contains 40-60% Cu and 40-60% Se.

[0068] The following examples further illustrate the preparation method of the selenium-enriched health pot of the present invention: Example 1

[0069] This embodiment provides a method for preparing a selenium-enriched health-preserving pot, including the following steps:

[0070] S1. Preparation of copper alloy powder: Cu, Al, Mg, Si and other substances are added to a water-gas combined atomization powder making furnace according to the copper alloy powder formula. After melting, water-gas combined atomization, filtration, drying and sieving, copper alloy powder with d50 of about 5 micrometers is obtained. The components and volume percentages in the copper alloy powder formula are: Al 2%, Si 1%, Mg 3%, and the balance is Cu.

[0071] S2. Selenium powder preparation: Pure selenium powder with a d50 of 3 micrometers is selected;

[0072] Preparation of S3 and SiC powders: Silicon carbide powder with a d50 of 5 micrometers was selected;

[0073] S4. Mixing: Mix the copper alloy powder, selenium powder, and SiC powder according to the formula ratio; load the mixed powder into a ball mill jar with a ball-to-powder ratio of 2.5:1, a rotation speed of 260 r / min, and ball mill for 8 hours to fully mix and homogenize into a composite material; wherein, the components and volume percentages of the composite material are: SiC powder 20%; copper alloy powder 79.9%; selenium powder 0.1%;

[0074] S5. Spray granulation: Add the above-mixed composite material to a 5% PVA concentration and stir thoroughly for 2-3 hours to obtain a slurry; feed the slurry into a spray granulator to obtain powder particles with a d50 of approximately 100-120 micrometers.

[0075] S6. Hot pressing sintering: The granulated composite material is loaded into a pot-shaped mold, placed in a hot pressing sintering furnace, with a pressure of 20MPa and a temperature of 960℃, and held for 5 minutes. The pot body is then demolded. Example 2

[0076] This embodiment provides a method for preparing a selenium-enriched health-preserving pot, including the following steps:

[0077] S1. Preparation of copper alloy powder: Cu, Al, Mg, Si and other substances are added to a water-gas combined atomization powder making furnace according to the copper alloy powder formula. After melting, water-gas combined atomization, filtration, drying and sieving, copper alloy powder with d50 of about 15 micrometers is obtained. The components and volume percentages in the copper alloy powder formula are: Al 2%, Si 2%, Mg 3%, and the balance is Cu.

[0078] S2. Selenium powder preparation: Pure selenium powder with a d50 of 7.5 micrometers is selected;

[0079] Preparation of S3 and SiC powders: Silicon carbide powder with a d50 of 10 micrometers was selected;

[0080] S4. Mixing: Mix the copper alloy powder, selenium powder, and SiC powder according to the formula ratio; load the mixed powder into a ball mill jar, with a ball-to-powder ratio of 2.5:1, a rotation speed of 260 r / min, and ball mill for 8 hours to fully mix and homogenize into a composite material; wherein, the components and volume percentages of the composite material are: SiC powder 34%; copper alloy powder 65.9%; selenium powder 0.1%;

[0081] S5. Spray granulation: Add the above-mixed composite material to a 5% PVA concentration and stir thoroughly for 2-3 hours to obtain a slurry; feed the slurry into a spray granulator to obtain powder particles with a d50 of approximately 100-120 micrometers.

[0082] S6. Hot pressing sintering: The granulated composite material is loaded into a pot-shaped mold, placed in a hot pressing sintering furnace, with a pressure of 20MPa and a temperature of 880℃, and held for 8 minutes. The pot body is then demolded. Example 3

[0083] This embodiment provides a method for preparing a selenium-enriched health-preserving pot, including the following steps:

[0084] S1. Preparation of copper alloy powder: Cu, Al, Mg, Si and other substances are added to a water-gas combined atomization powder making furnace according to the copper alloy powder formula. After melting, water-gas combined atomization, filtration, drying and sieving, copper alloy powder with d50 of about 20 micrometers is obtained. The components and volume percentages in the copper alloy powder formula are: Al 2%, Si 2%, Mg 1%, and the balance is Cu.

[0085] S2. Selenium powder preparation: Pure selenium powder with a d50 of 10 micrometers is selected;

[0086] Preparation of S3 and SiC powders: Silicon carbide powder with a d50 of 20 micrometers was selected;

[0087] S4. Mixing: Mix the copper alloy powder, selenium powder, and SiC powder according to the formula ratio; load the mixed powder into a ball mill jar with a ball-to-powder ratio of 2.5:1, a rotation speed of 260 r / min, and ball mill for 8 hours to fully mix and homogenize into a composite material; wherein, the components and volume percentages of the composite material are: SiC powder 65%; copper alloy powder 34.9%; selenium powder 0.1%;

[0088] S5. Spray granulation: Add the above-mixed composite material to a 5% PVA concentration and stir thoroughly for 2-3 hours to obtain a slurry; feed the slurry into a spray granulator to obtain powder particles with a d50 of approximately 100-120 micrometers.

[0089] S6. Hot pressing sintering: The granulated composite material is loaded into a pot-shaped mold, placed in a hot pressing sintering furnace, with a pressure of 20MPa and a temperature of 800℃, and held for 10 minutes. The pot body is then demolded. Example 4

[0090] This embodiment provides a method for preparing a selenium-enriched health-preserving pot, including the following steps:

[0091] S1. Preparation of copper alloy powder: Cu, Al, Mg, Si and other substances are added to a water-gas combined atomization powder making furnace according to the copper alloy powder formula. After melting, water-gas combined atomization, filtration, drying and sieving, copper alloy powder with d50 of about 7.5 micrometers is obtained. The components and volume percentages in the copper alloy powder formula are: Al 2%, Si 2%, Mg 3%, and the balance is Cu.

[0092] S2. Selenium powder preparation: Pure selenium powder with a d50 of 3 micrometers is selected;

[0093] Preparation of S3 and SiC powders: Silicon carbide powder with a d50 of 14 micrometers was selected;

[0094] S4. Mixing: Mix the copper alloy powder, selenium powder, and SiC powder according to the formula ratio; load the mixed powder into a ball mill jar with a ball-to-powder ratio of 2.5:1, a rotation speed of 260 r / min, and ball mill for 8 hours to fully mix and homogenize into a composite material; wherein, the components and volume percentages of the composite material are: SiC powder 40%; copper alloy powder 59%; selenium powder 1.0%;

[0095] S5. Spray granulation: Add the above-mixed composite material to a 5% PVA concentration and stir thoroughly for 2-3 hours to obtain a slurry; feed the slurry into a spray granulator to obtain powder particles with a d50 of approximately 100-120 micrometers.

[0096] S6. Hot pressing sintering: The granulated composite material is loaded into a pot-shaped mold, placed in a hot pressing sintering furnace, with a pressure of 20MPa and a temperature of 950℃, and held for 5 minutes. The pot body is then demolded. Example 5

[0097] This embodiment provides a method for preparing a selenium-enriched health-preserving pot, including the following steps:

[0098] S1. Preparation of copper alloy powder: Cu, Al, Mg, Si and other substances are added to a water-gas combined atomization powder making furnace according to the copper alloy powder formula. After melting, water-gas combined atomization, filtration, drying and sieving, copper alloy powder with d50 of about 7.5 micrometers is obtained. The components and volume percentages in the copper alloy powder formula are: Al 2%, Si 2%, Mg 3%, and the balance is Cu.

[0099] S2. Selenium powder preparation: Pure selenium powder with a d50 of 3 micrometers is selected;

[0100] Preparation of S3 and SiC powders: Silicon carbide powder with a d50 of 14 micrometers was selected;

[0101] S4. Mixing: Mix the copper alloy powder, selenium powder, and SiC powder according to the formula ratio; load the mixed powder into a ball mill jar with a ball-to-powder ratio of 2.5:1, a rotation speed of 260 r / min, and ball mill for 8 hours to fully mix and homogenize into a composite material; wherein, the components and volume percentages of the composite material are: SiC powder 40%; copper alloy powder 56%; selenium powder 4.0%;

[0102] S5. Spray granulation: Add the above-mixed composite material to a 5% PVA concentration and stir thoroughly for 2-3 hours to obtain a slurry; feed the slurry into a spray granulator to obtain powder particles with a d50 of approximately 100-120 micrometers.

[0103] S6. Hot pressing sintering: The granulated composite material is loaded into a pot-shaped mold, placed in a hot pressing sintering furnace, with a pressure of 20MPa and a temperature of 950℃, and held for 5 minutes. The pot body is then demolded.

[0104] The table below compares the selenium content and thermal conductivity released when the selenium-enriched health pots prepared in Examples 1 to 5 are heated to cook food.

[0105]

[0106] The volume percentage of copper alloy powder in the composite material of the present invention is 50%-70%.

[0107] The copper alloy powder of the present invention accounts for 60% of the volume percentage of the composite material.

[0108] The copper alloy powder of this invention contains 2% Si.

[0109] The Mg content in the copper alloy powder of this invention is 2%.

[0110] The volume percentage of SiC powder in the composite material of the present invention is 30%-65%.

[0111] The SiC powder of the present invention accounts for 50% of the volume percentage in the composite material.

[0112] The present invention also discloses a selenium-enriched health pot, which is made by the preparation method of the selenium-enriched health pot.

[0113] This invention relates to a selenium-enriched health pot, a high-end health pot that features efficient heating, rapid and even heat transfer, and continuous release of selenium into food. Compared with existing health pots, this invention has the following advantages:

[0114] 1. The composite material of this invention contains selenium powder. Selenium is slightly soluble in water. The selenium-enriched health pot contains a certain amount of selenium. When heated, it can release a concentration of 50-150 μg / kg of selenium in water. The solubility is very small but stable. During the heating process of food in the pot, it can continuously and stably release selenium ions that are beneficial to the human body. It is a selenium-enriched health pot with health care effects.

[0115] 2. Both Cu and silicon carbide in the composite material of this invention have high thermal conductivity. The pot body is prepared using copper alloy powder and silicon carbide powder. The thermal conductivity of the health pot can be adjusted to 100-200 W / mk (room temperature), and the composition and structure can be controlled, which is beneficial to the control of material properties and makes it easy to obtain a pot body with high thermal conductivity and high strength. The thermal conductivity can easily reach 100 W / mk, which is much higher than that of ordinary iron pots and steel pots. It has fast heat transfer, can heat quickly and evenly, is safe, efficient and energy-saving.

[0116] 3. This invention uses a powder metallurgy hot pressing sintering method to prepare a SiC / Cu composite selenium-enriched health pot. Hot pressing sintering introduces pressure to replace the traditional powder metallurgy method, simplifying the process and reducing equipment investment and usage. Moreover, the hot pressing powder metallurgy preparation process can obtain a uniform and dense pot body with a density of over 99%. Compared with casting or injection molding, the equipment is simple, the process flow is short, the sintering temperature is low, the holding time is short, the selenium-enriched health pot has high strength and thermal conductivity, and the cost is low.

[0117] 4. The composite material of the present invention is a Cu / SiC composite material, which is composed of a matrix and a reinforcing material. The matrix is ​​copper alloy powder and the reinforcing material is SiC powder. The copper-based composite material has a service temperature of up to 800℃ and has good thermal conductivity, dimensional stability, low coefficient of thermal expansion and high strength.

[0118] The above embodiments and accompanying drawings are not intended to limit the product form and style of the present invention. Any appropriate changes or modifications made by those skilled in the art should be considered as not departing from the patent scope of the present invention.

Claims

1. A method for preparing a selenium-enriched health-preserving hot pot, characterized in that, It includes the following steps: S1. Preparation of copper alloy powder: Cu, Al, Mg, and Si are added to a water-gas combined atomization powder-making furnace according to the copper alloy powder formula. After melting, water-gas combined atomization, filtration, drying, and sieving, copper alloy powder with a d50 of 5-20 micrometers is obtained. The components and volume percentages in the copper alloy powder formula are: Cu 90-95%, Al 0-5%, Si 0-2%, Mg 0-3%. S2. Selenium powder preparation: Select selenium powder with a d50 of 3-10 micrometers; Preparation of S3 and SiC powders: Silicon carbide powder with a d50 of 5-20 micrometers was selected; S4. Mixing: Mix the copper alloy powder, selenium powder, and SiC powder according to the formula ratio; load the mixed powder into a ball mill jar with a ball-to-powder ratio of 2.5:1 and a rotation speed of 260 r / min for 8 hours to fully mix and homogenize into a composite material; wherein, the components and volume percentages of the composite material are: SiC powder 20%-65%; copper alloy powder 30%-80%; selenium powder 0.1-4.0%; the composite material is composed of a matrix and a reinforcing material, wherein the matrix is ​​copper alloy powder and the reinforcing material is SiC powder; S5. Spray granulation: Add the above-mixed composite material to a 5% PVA solution and stir thoroughly for 2-3 hours to obtain a slurry; feed the slurry into a spray granulator to obtain powder particles with a d50 of 100-120 micrometers. S6. Hot pressing sintering: The granulated composite material is loaded into a pot-shaped mold and placed in a hot pressing sintering furnace. The pressure is 20-100MPa and the temperature is 800-1000℃. The pot body is obtained in 5-10 minutes. When the selenium-enriched health pot is heated in water, it releases selenium at a concentration of 50-150μg / kg.

2. The preparation method of the selenium-enriched health pot as described in claim 1, characterized in that... The selenium powder is pure selenium powder or selenium alloy powder, in which Cu accounts for 40-60% and Se accounts for 40-60%.

3. The preparation method of the selenium-enriched health pot as described in claim 2, characterized in that, It includes the following steps: S1. Preparation of copper alloy powder: Cu, Al, Mg and Si are added to a water-gas combined atomization powder making furnace according to the copper alloy powder formula. After melting, water-gas combined atomization, filtration, drying and sieving, copper alloy powder with d50 of 5 micrometers is obtained. The components and volume percentages in the copper alloy powder formula are: Al 2%, Si 1%, Mg 3%, and the balance is Cu. S2. Selenium powder preparation: Pure selenium powder with a d50 of 3 micrometers is selected; Preparation of S3 and SiC powders: Silicon carbide powder with a d50 of 5 micrometers was selected; S4. Mixing: Mix the copper alloy powder, selenium powder, and SiC powder according to the formula ratio; load the mixed powder into a ball mill jar with a ball-to-powder ratio of 2.5:1, a rotation speed of 260 r / min, and ball mill for 8 hours to fully mix and homogenize into a composite material; wherein, the components and volume percentages of the composite material are: SiC powder 20%; copper alloy powder 79.9%; selenium powder 0.1%; S5. Spray granulation: Add the above-mixed composite material to a 5% PVA concentration and stir thoroughly for 2-3 hours to obtain a slurry; feed the slurry into a spray granulator to obtain powder particles with a d50 of 100-120 micrometers. S6. Hot pressing sintering: The granulated composite material is loaded into a pot-shaped mold, placed in a hot pressing sintering furnace, with a pressure of 20MPa and a temperature of 960℃, and held for 5 minutes. The pot body is then demolded.

4. The preparation method of the selenium-enriched health pot as described in claim 2, characterized in that, It includes the following steps: S1. Preparation of copper alloy powder: Cu, Al, Mg, and Si are added to a water-gas combined atomization powder making furnace according to the copper alloy powder formula. After melting, water-gas combined atomization, filtration, drying, and sieving, copper alloy powder with a d50 of 15 micrometers is obtained. The components and volume percentages in the copper alloy powder formula are: Al 2%, Si 2%, Mg 3%, and the balance is Cu. S2. Selenium powder preparation: Pure selenium powder with a d50 of 7.5 micrometers is selected; Preparation of S3 and SiC powders: Silicon carbide powder with a d50 of 10 micrometers was selected; S4. Mixing: Mix the copper alloy powder, selenium powder, and SiC powder according to the formula ratio; load the mixed powder into a ball mill jar, with a ball-to-powder ratio of 2.5:1, a rotation speed of 260 r / min, and ball mill for 8 hours to fully mix and homogenize into a composite material; wherein, the components and volume percentages of the composite material are: SiC powder 34%; copper alloy powder 65.9%; selenium powder 0.1%; S5. Spray granulation: Add the above-mixed composite material to a 5% PVA concentration and stir thoroughly for 2-3 hours to obtain a slurry; feed the slurry into a spray granulator to obtain powder particles with a d50 of 100-120 micrometers. S6. Hot pressing sintering: The granulated composite material is loaded into a pot-shaped mold, placed in a hot pressing sintering furnace, with a pressure of 20MPa and a temperature of 880℃, and held for 8 minutes. The pot body is then demolded.

5. The preparation method of the selenium-enriched health pot as described in claim 2, characterized in that, It includes the following steps: S1. Preparation of copper alloy powder: Cu, Al, Mg, and Si are added to a water-gas combined atomization powder making furnace according to the copper alloy powder formula. After melting, water-gas combined atomization, filtration, drying, and sieving, copper alloy powder with a d50 of 7.5 micrometers is obtained. The components and volume percentages in the copper alloy powder formula are: Al 2%, Si 2%, Mg 3%, and the balance is Cu. S2. Selenium powder preparation: Pure selenium powder with a d50 of 3 micrometers is selected; Preparation of S3 and SiC powders: Silicon carbide powder with a d50 of 14 micrometers was selected; S4. Mixing: Mix the copper alloy powder, selenium powder, and SiC powder according to the formula ratio; load the mixed powder into a ball mill jar with a ball-to-powder ratio of 2.5:1, a rotation speed of 260 r / min, and ball mill for 8 hours to fully mix and homogenize into a composite material; wherein, the components and volume percentages of the composite material are: SiC powder 40%; copper alloy powder 59%; selenium powder 1.0%; S5. Spray granulation: Add the above-mixed composite material to a 5% PVA concentration and stir thoroughly for 2-3 hours to obtain a slurry; feed the slurry into a spray granulator to obtain powder particles with a d50 of 100-120 micrometers. S6. Hot pressing sintering: The granulated composite material is loaded into a pot-shaped mold, placed in a hot pressing sintering furnace, with a pressure of 20MPa and a temperature of 950℃, and held for 5 minutes. The pot body is then demolded.

6. The preparation method of the selenium-enriched health pot as described in claim 2, characterized in that, It includes the following steps: S1. Preparation of copper alloy powder: Cu, Al, Mg, and Si are added to a water-gas combined atomization powder making furnace according to the copper alloy powder formula. After melting, water-gas combined atomization, filtration, drying, and sieving, copper alloy powder with a d50 of 7.5 micrometers is obtained. The components and volume percentages in the copper alloy powder formula are: Al 2%, Si 2%, Mg 3%, and the balance is Cu. S2. Selenium powder preparation: Pure selenium powder with a d50 of 3 micrometers is selected; Preparation of S3 and SiC powders: Silicon carbide powder with a d50 of 14 micrometers was selected; S4. Mixing: Mix the copper alloy powder, selenium powder, and SiC powder according to the formula ratio; load the mixed powder into a ball mill jar with a ball-to-powder ratio of 2.5:1, a rotation speed of 260 r / min, and ball mill for 8 hours to fully mix and homogenize into a composite material; wherein, the components and volume percentages of the composite material are: SiC powder 40%; copper alloy powder 56%; selenium powder 4.0%; S5. Spray granulation: Add the above-mixed composite material to a 5% PVA concentration and stir thoroughly for 2-3 hours to obtain a slurry; feed the slurry into a spray granulator to obtain powder particles with a d50 of 100-120 micrometers. S6. Hot pressing sintering: The granulated composite material is loaded into a pot-shaped mold, placed in a hot pressing sintering furnace, with a pressure of 20MPa and a temperature of 950℃, and held for 5 minutes. The pot body is then demolded.

7. The preparation method of the selenium-enriched health pot as described in claim 1, characterized in that: The copper alloy powder contains 2% Si and 2% Mg.

8. A selenium-enriched health-preserving pot, characterized in that: The selenium-enriched health pot is made by the preparation method of a selenium-enriched health pot as described in any one of claims 1-7.

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