A special alloy bipolar rare earth electric heating material and its preparation method

Abstract

The present invention provides a special alloy bipolar rare earth electric heating material and a preparation method thereof, wherein the weight proportions of the components are: 2-15 parts of Mo, 3-15 parts of W, 2-10 parts of Ti, 3-15 parts of C, 2-10 parts of La, 3-15 parts of Hf, 2-10 parts of Zr, 5-20 parts of Si, 2-10 parts of Ni, 0.5-3 parts of Al, and 0-3 parts of B. The present invention adopts unique components and processing technology to prepare the electric heating material, which perfectly retains the high thermal efficiency characteristics of the Mo material, has low attenuation of heating efficiency, and has a high upper temperature resistance of more than 1400°C, a long and stable service life, and is not easy to scale when heating hot water. When the material is damaged and unprotected when powered in water, the leakage current is less than 10 mA, which is far lower than the requirement of 30 mA or less for the mandatory 3C certification of home appliances, and has high safety.

Description

Technical Field

[0001] The invention relates to the technical field of materials, and in particular to a special alloy bipolar rare earth electric heating material and a preparation method thereof. Background Art

[0002] Heating, hot water heating, heating system and other heating methods are essential industries in the lives of Chinese people. Since this type of heating generally uses coal burning as a heating source, it will also produce polluting gases during heating. With the improvement of people's living standards in my country, people's environmental awareness is getting higher and higher, and zero-emission and zero-pollution green energy is becoming more and more popular. Therefore, electric heating has gradually become the mainstream of heating, and the demand for various materials used for electric heating will also increase.

[0003] The existing mainstream electric heating devices mostly use electric heating rods, which have the following defects due to material reasons:

[0004] 1. The problem of thermal efficiency attenuation: As the heating time continues, the electric heating rod's electric heat conversion efficiency gradually decreases, resulting in a common phenomenon in the actual use of electric heating equipment that the heating effect is good this year and poor in the second year.

[0005] 2. The problem of low service life: Electric heating equipment using electric heating tubes under good working conditions generally needs to replace the heating tubes in about three years. Under poor working conditions, they may even need to be replaced and maintained within a year, resulting in high equipment maintenance costs.

[0006] 3. Scaling problem: When the electric heating rod heats water, scale is easily formed on the electric heating rod, which further affects the heat dissipation efficiency and service life. For example, if the amount of hot water used for bathing is large, the heating tube should be replaced within two months of use. Summary of the invention

[0007] The present invention aims to solve the deficiencies of the prior art and provides a special alloy bipolar rare earth electrothermal material and a preparation method thereof.

[0008] In order to achieve the above object, the present invention adopts the following technical solutions:

[0009] A special alloy bipolar rare earth electric heating material, the components of which are as follows by weight: 2-15 parts of Mo, 3-15 parts of W, 2-10 parts of Ti, 3-15 parts of C, 2-10 parts of La, 3-15 parts of Hf, 2-10 parts of Zr, 5-20 parts of Si, 2-10 parts of Ni, 0.5-3 parts of Al and 0-3 parts of B.

[0010] Furthermore, the weight proportions of the components are: 3 to 7 parts of Mo, 2 to 10 parts of W, 2 to 10 parts of Ti, 10 to 13 parts of C, 2 to 10 parts of La, 5 to 12 parts of Hf, 5 to 8 parts of Zr, 10 to 15 parts of Si, 7 to 8 parts of Ni, 1 to 1.5 parts of Al, and 1 to 2 parts of B.

[0011] Furthermore, the weight proportions of its components are: 5 parts of Mo, 6 parts of W, 7 parts of Ti, 11 parts of C, 5 parts of La, 6 parts of Hf, 6 parts of Zr, 12 parts of Si, 7.5 parts of Ni, 1 part of Al, and 1 part of B.

[0012] Furthermore, the weight proportions of its components are: 5 parts of Mo, 7 parts of W, 6 parts of Ti, 12 parts of C, 6 parts of La, 7 parts of Hf, 5 parts of Zr, 12 parts of Si, 7.5 parts of Ni, 1 part of Al, and 1 part of B.

[0013] Furthermore, the weight proportions of its components are: 8 parts of Mo, 9.5 parts of W, 6 parts of Ti, 12 parts of C, 6 parts of La, 7 parts of Hf, 5 parts of Zr, 12 parts of Si, 7.5 parts of Ni, 1 part of Al, and 1.5 parts of B.

[0014] A method for preparing a special alloy bipolar rare earth electric heating material, the specific steps are as follows:

[0015] Step 1: Prepare particle raw materials of Mo, W, Ti, C, La, Hf, Zr, Si, Ni, Al and B;

[0016] Step 2: removing impurities from the granular raw material prepared in step 1 at high temperature under nitrogen filling conditions;

[0017] Step 3: Compounding the raw materials after high-temperature impurity removal in step 2 under air-tight conditions at high temperatures to make them molten;

[0018] Step 4: Filling the molten composite material in step 3 into the mold;

[0019] Step 5: Die-cast the composite material in the mold to obtain a special alloy bipolar rare earth electric heating material.

[0020] Furthermore, the temperature of high-temperature impurity removal in step 2 is 1000±100°C.

[0021] Furthermore, the temperature of the high temperature compounding in step three is 1500±50°C.

[0022] The beneficial effects of the present invention are as follows: the present invention adopts unique components and processing technology to prepare the electric heating material, the material perfectly retains the high thermal efficiency characteristics of the Mo material, the attenuation of the heating efficiency is low, the upper temperature limit is as high as 1400°C or more, the service life is long and stable, and it is not easy to scale when heating hot water. When the material is damaged and unprotected when powered in water, the leakage current is less than 10 mA, which is far lower than the requirement of 30 mA or less for the mandatory 3C certification of home appliances, and the safety is high. DETAILED DESCRIPTION

[0023] The present invention will be further described below in conjunction with embodiments:

[0024] Embodiment 1

[0025] Step 1: Prepare 5 parts of Mo, 6 parts of W, 7 parts of Ti, 11 parts of C, 5 parts of La, 6 parts of Hf, 6 parts of Zr, 12 parts of Si, 7.5 parts of Ni, 1 part of Al, and 1 part of B particle raw materials;

[0026] Step 2: removing impurities from the granular raw material prepared in step 1 at high temperature under nitrogen filling conditions, wherein the temperature of high temperature removal of impurities is 1000±100°C;

[0027] Step 3: Compound the raw materials after high-temperature impurity removal in step 2 under air-tight conditions to make them molten, and the temperature of high-temperature compounding is 1500±50°C;

[0028] Step 4: Fill the molten composite material in step 3 into a graphite mold, the inner cavity of the mold is a rectangular parallelepiped, and the specific size is 12mm*4mm*110mm;

[0029] Step 5: Maintain the temperature of 1500±50 and apply a pressure of 3 MPa to die-cast the composite material in the mold to obtain a special alloy bipolar rare earth electric heating material.

[0030] Embodiment 2

[0031] Step 1, prepare granular raw materials of 5 parts of Mo, 7 parts of W, 6 parts of Ti, 12 parts of C, 6 parts of La, 7 parts of Hf, 5 parts of Zr, 12 parts of Si, 7.5 parts of Ni, 1 part of Al, and 1 part of B;

[0032] Step 2: removing impurities from the granular raw material prepared in step 1 at high temperature under nitrogen filling conditions, wherein the temperature of high temperature removal of impurities is 1000±100°C;

[0033] Step 3: Compound the raw materials after high-temperature impurity removal in step 2 under air-tight conditions to make them molten, and the temperature of high-temperature compounding is 1500±50°C;

[0034] Step 4: Fill the molten composite material in step 3 into a graphite mold, the inner cavity of the mold is a rectangular parallelepiped, and the specific size is 12mm*4mm*110mm;

[0035] Step 5: Maintain the temperature of 1500±50 and apply a pressure of 3 MPa to die-cast the composite material in the mold to obtain a special alloy bipolar rare earth electric heating material.

[0036] Embodiment 3

[0037] Step 1, prepare granular raw materials of 15 parts of Mo, 15 parts of W, 10 parts of Ti, 15 parts of C, 10 parts of La, 15 parts of Hf, 10 parts of Zr, 20 parts of Si, 10 parts of Ni, 3 parts of Al, and 3 parts of B;

[0038] Step 2: removing impurities from the granular raw material prepared in step 1 at high temperature under nitrogen filling conditions, wherein the temperature of high temperature removal of impurities is 1000±100°C;

[0039] Step 3: Compound the raw materials after high-temperature impurity removal in step 2 under air-tight conditions to make them molten, and the temperature of high-temperature compounding is 1500±50°C;

[0040] Step 4: Fill the molten composite material in step 3 into a graphite mold, the inner cavity of the mold is a rectangular parallelepiped, and the specific size is 12mm*4mm*110mm;

[0041] Step 5: Maintain the temperature of 1500±50 and apply a pressure of 3 MPa to die-cast the composite material in the mold to obtain a special alloy bipolar rare earth electric heating material.

[0042] Embodiment 4

[0043] Step 1, prepare 2 parts of Mo, 3 parts of W, 2 parts of Ti, 3 parts of C, 2 parts of La, 3 parts of Hf, 2 parts of Zr, 5 parts of Si, 2 parts of Ni, and 0.5 parts of Al particle raw materials;

[0044] Step 2: removing impurities from the granular raw material prepared in step 1 at high temperature under nitrogen filling conditions, wherein the temperature of high temperature removal of impurities is 1000±100°C;

[0045] Step 3: Compound the raw materials after high-temperature impurity removal in step 2 under air-tight conditions to make them molten, and the temperature of high-temperature compounding is 1500±50°C;

[0046] Step 4: Fill the molten composite material in step 3 into a graphite mold, the inner cavity of the mold is a rectangular parallelepiped, and the specific size is 12mm*4mm*110mm;

[0047] Step 5: Maintain the temperature of 1500±50 and apply a pressure of 3 MPa to die-cast the composite material in the mold to obtain a special alloy bipolar rare earth electric heating material.

[0048] Comparative Example 1

[0049] Step 1, prepare 5 parts of Mo, 1 part of W, 6 parts of Ti, 12 parts of C, 6 parts of La, 7 parts of Hf, 5 parts of Zr, 12 parts of Si, 7.5 parts of Ni, 1 part of Al, and 1 part of B particle raw materials;

[0050] Step 2: removing impurities from the granular raw material prepared in step 1 at high temperature under nitrogen filling conditions, wherein the temperature of high temperature removal of impurities is 1000±100°C;

[0051] Step 3: Compound the raw materials after high-temperature impurity removal in step 2 under air-tight conditions to make them molten, and the temperature of high-temperature compounding is 1500±50°C;

[0052] Step 4: Fill the molten composite material in step 3 into a graphite mold, the inner cavity of the mold is a rectangular parallelepiped, and the specific size is 12mm*4mm*110mm;

[0053] Step 5: Maintain the temperature of 1500±50 and apply a pressure of 3 MPa to die-cast the composite material in the mold to obtain a special alloy bipolar rare earth electric heating material.

[0054] Comparative Example 2

[0055] Step 1, prepare granular raw materials of 5 parts of Mo, 2 parts of W, 1 part of Ti, 12 parts of C, 6 parts of La, 7 parts of Hf, 5 parts of Zr, 12 parts of Si, 7.5 parts of Ni, 1 part of Al, and 1 part of B;

[0056] Step 2: removing impurities from the granular raw material prepared in step 1 at high temperature under nitrogen filling conditions, wherein the temperature of high temperature removal of impurities is 1000±100°C;

[0057] Step 3: Compound the raw materials after high-temperature impurity removal in step 2 under air-tight conditions to make them molten, and the temperature of high-temperature compounding is 1500±50°C;

[0058] Step 4: Fill the molten composite material in step 3 into a graphite mold, the inner cavity of the mold is a rectangular parallelepiped, and the specific size is 12mm*4mm*110mm;

[0059] Step 5: Maintain the temperature of 1500±50 and apply a pressure of 3 MPa to die-cast the composite material in the mold to obtain a special alloy bipolar rare earth electric heating material.

[0060] The electric heating materials made by the methods of each embodiment and each comparative example were subjected to comparative tests under the same experimental conditions. The electric heating materials were used to heat 1m 3 The tap water was used and the water volume was maintained during the test. The final data is shown in the following table (Table 1):

[0061] Table 1 Experimental data of embodiments and comparative examples

[0062]

[0063] It can be clearly seen from the above table that the heating efficiency attenuation of the electric heating material prepared according to the method of the present invention is low, the high thermal efficiency characteristics of the Mo material are perfectly retained, the service life is long, and it is not easy to scale when heating hot water. When the material is damaged and unprotected when powered in water, the leakage current is less than 10 mA, which is far lower than the requirement of 30 mA for the mandatory 3C certification of home appliances, and has high safety.

[0064] The present invention has been exemplarily described above in conjunction with specific embodiments. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned methods. As long as various improvements are made using the method concept and technical solution of the present invention, or they are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A special alloy bipolar rare earth electric heating material, It is characterized in that The weight proportions of the components are: 2 to 15 parts of Mo, 3 to 15 parts of W, 2 to 10 parts of Ti, 3 to 15 parts of C, 2 to 10 parts of La, 3 to 15 parts of Hf, 2 to 10 parts of Zr, 5 to 20 parts of Si, 2 to 10 parts of Ni, 0.5 to 3 parts of Al and 0 to 3 parts of B.

2. The special alloy bipolar rare earth electrothermal material according to claim 1, It is characterized in that The weight proportions of the components are: 3-7 parts of Mo, 3-10 parts of W, 2-10 parts of Ti, 10-13 parts of C, 2-10 parts of La, 5-12 parts of Hf, 5-8 parts of Zr, 10-15 parts of Si, 7-8 parts of Ni, 1-1.5 parts of Al and 1-2 parts of B.

3. The special alloy bipolar rare earth electrothermal material according to claim 1, It is characterized in that The weight proportions of its components are: 5 parts of Mo, 6 parts of W, 7 parts of Ti, 11 parts of C, 5 parts of La, 6 parts of Hf, 6 parts of Zr, 12 parts of Si, 7.5 parts of Ni, 1 part of Al, and 1 part of B.

4. The special alloy bipolar rare earth electrothermal material according to claim 1, It is characterized in that The weight proportions of its components are: 5 parts of Mo, 7 parts of W, 6 parts of Ti, 12 parts of C, 6 parts of La, 7 parts of Hf, 5 parts of Zr, 12 parts of Si, 7.5 parts of Ni, 1 part of Al, and 1 part of B.

5. The special alloy bipolar rare earth electrothermal material according to claim 1, It is characterized in that The weight proportions of its components are: 8 parts of Mo, 9.5 parts of W, 6 parts of Ti, 12 parts of C, 6 parts of La, 7 parts of Hf, 5 parts of Zr, 12 parts of Si, 7.5 parts of Ni, 1 part of Al, and 1.5 parts of B.

6. A method for preparing the special alloy bipolar rare earth electrothermal material according to any one of claims 1 to 5, It is characterized in that The specific steps are as follows: Step 1: Prepare particle raw materials of Mo, W, Ti, C, La, Hf, Zr, Si, Ni, Al and B; Step 2: removing impurities from the granular raw material prepared in step 1 at high temperature under nitrogen filling conditions; Step 3: Compounding the raw materials after high-temperature impurity removal in step 2 under air-tight conditions at high temperatures to make them molten; Step 4: Filling the molten composite material in step 3 into the mold; Step 5: die-casting the composite material in the mold to obtain a special alloy bipolar rare earth electric heating material; The temperature of high temperature impurity removal in step 2 is 1000±100°C, and the temperature of high temperature compounding in step 3 is 1500±50°C.

Images