A rare earth modified transition layer material and methods of making and using the same

Abstract

The application discloses a rare earth modified transition layer material, which comprises the following raw materials in parts by weight: 10-100 parts of metal lanthanum cerium, 6000-7000 parts of metal iron, 1100-1300 parts of boron iron, 100-500 parts of silicon iron and 6000-7000 parts of metal nickel. The preparation method comprises the following steps: (1) weighing the raw materials and adding them into a vacuum induction melting furnace; (2) vacuumizing, filling high-purity argon, increasing temperature and keeping temperature; (3) vacuumizing, filling high-purity argon, increasing temperature, keeping temperature after all the metals are melted; (4) pouring into a mold and cooling; and (5) preparing spherical alloy spraying powder, thereby obtaining the rare earth modified transition layer material. The use method comprises the following steps: adopting plasma spraying process, controlling spraying power to be 15-32 KW, voltage to be 40-55 V, current to be 360-560 A, gas flow to be 25-45 L / min and spraying distance to be 10-25 cm. The rare earth modified transition layer material has high sphericity and good fluidity, the obtained coating has a bonding strength reaching the level of nickel-coated aluminum coating, and the hardness and wear resistance of the coating are much higher than those of the nickel-coated aluminum coating.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of transition layer materials, and more particularly to a rare earth modified transition layer material and a preparation method and use method thereof. BACKGROUND

[0002] The thermal spraying technology is a method of using a heat source to heat a spraying material to a molten or semi-molten state and spray and deposit the material to a pretreated substrate surface at a certain speed to form a coating. The thermal spraying technology can manufacture a special working surface on the surface of a common material to achieve corrosion resistance, wear resistance, friction reduction, high temperature resistance, oxidation resistance, heat insulation, insulation, electrical conductivity, microwave radiation resistance and other functions, thereby achieving the purposes of saving materials and energy. Generally, the special working surface is called a coating, and the working method of manufacturing the coating is called thermal spraying. The thermal spraying technology is one of important components of surface process technology, accounting for about one third of surface engineering technology.

[0003] At present, the transition layer materials used in the field of thermal spraying technology are basically nickel-coated aluminum or aluminum-coated nickel powder, so as to improve the bonding strength of the coating and the substrate. Then, oxide, carbide or nitride materials are sprayed on the surface of the transition coating material, so as to prepare a coating with wear resistance, corrosion resistance and other properties. However, the price of nickel is high, and the hardness of the nickel-coated aluminum coating is small, which cannot be directly used as a wear-resistant or corrosion-resistant coating.

[0004] Therefore, how to develop a transition layer material with high hardness, high bonding strength and high wear resistance is a problem to be solved by those skilled in the art. SUMMARY

[0005] Therefore, the present application aims to provide a rare earth modified transition layer material and a preparation method and use method thereof to solve the problems in the prior art.

[0006] In order to achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0007] A rare earth modified transition layer material comprises the following raw materials by weight: 10-100 parts of metal lanthanum cerium, 6000-7000 parts of metal iron, 1100-1300 parts of boron iron, 100-500 parts of silicon iron and 6000-7000 parts of metal nickel.

[0008] Preferably, 60 parts of metal lanthanum cerium, 6360 parts of metal iron, 1200 parts of boron iron, 300 parts of silicon iron and 6540 parts of metal nickel are used.

[0009] The metal lanthanum plays a role of refining grains and purifying metallographic structure.

[0010] The metal cerium plays a role of solid solution strengthening and dispersion strengthening in the alloy.

[0011] The boron element in the boron iron can form boride with other elements in the alloy, form a strengthening phase near the grain boundary, improve the strength and toughness of the grain boundary, hinder the slip and diffusion of the grain boundary, and improve the tensile strength and fracture toughness of the alloy. The hardness of the alloy is improved, and the wear resistance is increased.

[0012] The silicon element in the silicon iron can promote the precipitation of the alloy, improve the hardness and strength of the alloy, and improve the wear resistance and corrosion resistance of the alloy.

[0013] Metal nickel has the effects of preventing oxidation and corrosion, prolonging the service time of the coating, and improving the toughness and bonding strength of the coating.

[0014] A preparation method of a rare earth modified transition layer material, specifically comprising the following steps:

[0015] (1) The raw materials are weighed according to the weight fraction of the above-mentioned rare earth modified transition layer material, and are added into a vacuum induction melting furnace;

[0016] (2) The furnace body is first vacuumed to control the vacuum degree to be 0.1-20 Pa, and then high-purity argon is filled to make the pressure in the furnace be 3-5×10 4 Pa, at this time the melting temperature in the furnace is increased to 100-200℃, and the temperature is kept constant;

[0017] (3) The furnace body is vacuumed again to control the vacuum degree to be 0.1-5 Pa, and then high-purity argon is filled to make the pressure in the furnace be 3-5×10 4 Pa, at this time the melting temperature in the furnace is increased to 1540-1580℃, after all the metals are melted, the temperature is kept constant, and the alloy melt is obtained;

[0018] (4) The alloy melt is poured into a mold under vacuum, and cooled to obtain a rare earth iron-nickel alloy;

[0019] (5) The rare earth iron-nickel alloy is made into spherical alloy spraying powder by vacuum plasma rotating electrode powder process or vacuum induction gas atomization powder process, and the rare earth modified transition layer material is obtained.

[0020] Further, in the above step (2), the temperature keeping time is 1-6 min.

[0021] Further, in the above step (3), the temperature keeping time is 2-6 min.

[0022] Further, in the above step (4), in the rare earth iron-nickel alloy, the content of rare earth is 0.01%-1%, the content of iron is 50%-65%, the content of boron is 1%-3%, the content of silicon is 0.1%-2%, the content of oxygen is 200-600 ppm, and the content of nickel is 30%-40%.

[0023] Further, in the step (5), the particle size of the spherical alloy spraying powder is 35-53 microns.

[0024] Further, in the step (5), the flowability of the spherical alloy spraying powder is <15 s / 50 g.

[0025] A method for using the rare earth modified transition layer material, specifically comprising the following steps: using a plasma spraying process, controlling the spraying power to be 15-32 KW, the voltage to be 40-55 V, the current to be 360-560 A, the gas flow to be 25-45 L / min, the spraying distance to be 10-25 cm, so as to obtain a wear-resistant coating with a hardness HV0.1 of 1000-1500, a bonding strength of 25-35 MPa, and a volume wear rate of less than 5*10 -4 mm 3 / N·min.

[0026] Further, the measurement condition of the volume wear rate is a load of 100 N, a frequency of 5 Hz, and a time of 120 min.

[0027] According to the technical solution, compared with the prior art, the present application has the following beneficial effects:

[0028] The present application provides a rare earth modified transition layer material with high hardness, high bonding strength and high wear resistance. Compared with the commonly used nickel-coated aluminum or aluminum-coated nickel transition layer material, the spherical degree of the present application is high, the flowability is good, the bonding strength of the obtained coating reaches the level of the nickel-coated aluminum coating, and the hardness and wear resistance are much higher than those of the nickel-coated aluminum coating. BRIEF DESCRIPTION OF DRAWINGS

[0029] Fig. 1 SEM image of the rare earth modified transition layer material of Example 1;

[0030] Fig. 2 SEM image of the rare earth modified transition layer material of Example 2. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be described clearly and completely below. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0032] Example 1

[0033] The rare earth modified transition layer material comprises the following raw materials by weight: 60 g of metal lanthanum and cerium, 6360 g of metal iron, 1200 g of boron iron, 300 g of silicon iron, and 6540 g of metal nickel.

[0034] The preparation method of the rare earth modified transition layer material specifically comprises the following steps:

[0035] (1) The raw materials are weighed according to the weight of the rare earth modified transition layer material and added into a vacuum induction melting furnace;

[0036] (2) The furnace body is first vacuumized, the vacuum degree is controlled to be 20 Pa, high-purity argon is filled again until the pressure in the furnace is 3.5*10 4 Pa, at this time the melting temperature in the furnace is increased to 200℃, and the temperature is kept for 5 min;

[0037] (3) The furnace body is vacuumized again, the vacuum degree is controlled to be 5 Pa, high-purity argon is filled again until the pressure in the furnace is 3*10 4 Pa, at this time the melting temperature in the furnace is increased to 1560℃, after all the metals are melted, the temperature is kept for 3 min, and an alloy melt is obtained;

[0038] (4) The alloy melt is poured into a mold under vacuum, and cooled to obtain a rare earth iron-nickel alloy;

[0039] (5) The rare earth iron-nickel alloy is made into spherical alloy spraying powder with a particle size range of 35-53 μm and fluidity of 12.3 s / 50 g by a vacuum plasma rotating electrode powdering process, and the rare earth modified transition layer material is obtained.

[0040] Example 2

[0041] The rare earth modified transition layer material comprises the following raw materials by weight: 60 g of metal lanthanum and cerium, 6360 g of metal iron, 1200 g of boron iron, 300 g of silicon iron, and 6540 g of metal nickel;

[0042] The preparation method of the rare earth modified transition layer material specifically comprises the following steps:

[0043] (1) The raw materials are weighed according to the weight of the rare earth modified transition layer material and added into a vacuum induction melting furnace;

[0044] (2) The furnace body is first vacuumized, the vacuum degree is controlled to be 20 Pa, high-purity argon is filled again until the pressure in the furnace is 3.5*10 4 Pa, at this time the melting temperature in the furnace is increased to 200℃, and the temperature is kept for 5 min;

[0045] (3) The furnace body is vacuumized again, the vacuum degree is controlled to be 5 Pa, high-purity argon is filled again until the pressure in the furnace is 3*10 4 Pa, at this time the melting temperature in the furnace is increased to 1560℃, after all the metals are melted, the temperature is kept for 3 min, and an alloy melt is obtained;

[0046] (4) The alloy melt is poured into a mold under vacuum, and cooled to obtain a rare earth iron-nickel alloy;

[0047] (5) Using vacuum induction gas atomization powdering process, the rare earth iron nickel alloy is made into spherical alloy spraying powder with particle size range of 35-53 μm and fluidity of 14.3 s / 50 g, namely the rare earth modified transition layer material.

[0048] Performance test

[0049] 1. The rare earth modified transition layer materials prepared in Examples 1-2 are respectively characterized by SEM.

[0050] The results are shown in Table 1-2. Figs. 1-2

[0051] As shown in Table 1-2, the spherical degree of the rare earth modified transition layer materials of Examples 1-2 is high, and the fluidity is good.

[0052] 2. The rare earth modified transition layer material prepared in Example 1 and a certain commercially available nickel-coated aluminum transition layer material are respectively sprayed by using plasma spraying process, and the hardness HV0.1, the bonding strength and the volume wear rate (load 100 N, frequency 5 Hz, time 120 min) of the obtained coating are respectively tested.

[0053] The plasma spraying process parameters are as follows: spraying power is 28.6 KW, voltage is 53.5 V, current is 534.5 A, gas flow is 35 L / min, and spraying distance is 15 cm.

[0054] The results are shown in Table 1.

[0055] Table 1 Coating performance of the rare earth modified transition layer material of Example 1 and the certain commercially available nickel-coated aluminum transition layer material

[0056]

[0057]

[0058] As shown in Table 1, compared with the certain commercially available nickel-coated aluminum transition layer material, the coating hardness obtained by using the rare earth modified transition layer material of Example 1 is significantly improved, the bonding strength is basically the same, and the volume wear rate is significantly reduced.

[0059] The above test shows that the present application provides a rare earth modified transition layer material with high hardness, high bonding strength and high wear resistance. Compared with the currently commonly used nickel-coated aluminum or aluminum-coated nickel transition layer material, the spherical degree of the rare earth modified transition layer material is high, the fluidity is good, the bonding strength of the obtained coating reaches the level of the nickel-coated aluminum coating, and the hardness and wear resistance are much higher than those of the nickel-coated aluminum coating.

[0060] ​The foregoing description of the disclosed embodiments enables a person skilled in the art to make or use the application. Modifications of these embodiments will occur to persons of skill in the art, and that the appended claims are intended to cover all such modifications that do not depart from the true spirit and scope of the application. Therefore, the application is not limited to the embodiments shown but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method of using a rare earth modified transition layer material, characterized by, The rare earth modified transition layer material comprises raw materials in the following weight parts: 10-100 parts of metal lanthanum cerium, 6000-7000 parts of metal iron, 1100-1300 parts of boron iron, 100-500 parts of silicon iron and 6000-7000 parts of metal nickel; The preparation method of the rare earth modified transition layer material specifically comprises the following steps: (1) the raw materials are weighed according to the weight parts of the rare earth modified transition layer material and added into a vacuum induction melting furnace; (2) First, the furnace is vacuumed to a vacuum degree of 0.1-20 Pa, and then high-purity argon is filled to a pressure of 3-5 x 10 4 Pa in the furnace, at which time the melting temperature in the furnace is increased to 100-200℃, and the temperature is maintained for 1-6 min. (3) vacuumizing the furnace body again, controlling the vacuum degree to be 0.1-5 Pa, then filling high-purity argon to make the pressure in the furnace be 3-5×10 4 Pa, at this time, increasing the smelting temperature in the furnace to 1540-1580℃, after all the metals are melted, keeping the temperature for 2-6 min, obtaining the alloy melt; (4) the alloy melt is poured into a mold under vacuum, and cooled to obtain a rare earth iron nickel alloy; In the rare earth iron nickel alloy, the content of rare earth is 0.01%-1%, the content of iron is 50%-65%, the content of boron is 1%-3%, the content of silicon is 0.1%-2%, the content of oxygen is 200-600ppm, and the content of nickel is 30%-40%; (5) the rare earth iron nickel alloy is made into spherical alloy spraying powder with a particle size range of 35-53μm and fluidity <15s / 50g by using a vacuum plasma rotating electrode powdering process or a vacuum induction gas atomization powdering process, so as to obtain the rare earth modified transition layer material; The method for using the rare earth modified transition layer material specifically comprises the following steps: adopting a plasma spraying process, controlling the spraying power to be 15-32 kW, the voltage to be 40-55 V, the current to be 360-560 A, the gas flow to be 25-45 L / min, and the spraying distance to be 10-25 cm, so that the wear-resistant coating with the hardness HV0.1 of 1000-1500, the bonding strength of 25-35 MPa, the volume wear rate of less than 5*10 -4 mm 3 / N·min is obtained. The determination condition of the volume wear rate is a load of 100N, a frequency of 5Hz and a time of 120min.

2. The method of using a rare earth modified transition layer material of claim 1, wherein, The rare earth modified transition layer material comprises raw materials in the following weight parts: 60 parts of metal lanthanum cerium, 6360 parts of metal iron, 1200 parts of boron iron, 300 parts of silicon iron and 6540 parts of metal nickel.

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