A method for producing a porous nickel-based alloy material

Abstract

The application discloses a preparation method of a porous nickel-based alloy material, and comprises the following steps: first, proportionally preparing superfine spherical nickel-based alloy powder and carbonyl nickel powder; second, uniformly mixing the superfine spherical nickel-based alloy powder and the carbonyl nickel powder to obtain mixed powder; third, pressing the mixed powder to form a green body of the porous nickel-based alloy material; and fourth, sintering the green body of the porous nickel-based alloy material to obtain the porous nickel-based alloy material. By adding the carbonyl nickel powder into the superfine spherical nickel-based alloy powder, the problem that the superfine spherical nickel-based alloy powder is not easy to be pressed to form a porous material is solved, the subsequent sintering temperature is reduced, and the sintering cost is reduced. Meanwhile, the pore structure of the porous nickel-based alloy material is regulated by regulating the adding amount of the carbonyl nickel powder, and the permeability of the porous nickel-based alloy material is controlled, so that the low-cost and low-permeability porous nickel-based alloy material can be obtained and applied in the fields of heat exchange and filtration.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of powder metallurgy and metal porous material preparation, and particularly relates to a preparation method of a porous nickel-based alloy material. BACKGROUND

[0002] Metal porous material, as an excellent new type of engineering material with both functional and structural attributes, has important roles in heat exchange, gas (liquid) filtration and other aspects, and has wide application prospects in the fields of aerospace, environmental protection, national defense and the like, and is one of the frontiers of metal material research.

[0003] The nickel-based alloy porous material not only has the properties of high temperature resistance and corrosion resistance of nickel-based alloy, but also has the pore structure characteristics of general metal porous materials, and is the most commonly used porous material among metal porous materials. At present, it has been widely applied in the fields of nuclear industry, polycrystalline silicon filtration and separation industry, supercritical oxidation technology and the like.

[0004] However, with the continuous progress of industrial technology, new and higher requirements are put forward for the performance of the nickel-based alloy porous material. Therefore, it is necessary to develop a new type of nickel-based alloy porous material and a preparation method thereof to meet the performance requirements of low-cost and low-permeability nickel-based alloy porous material in many fields such as supercritical oxidation technology. SUMMARY

[0005] The technical problem to be solved by the present application is to provide a preparation method of a porous nickel-based alloy material in view of the above-mentioned deficiencies of the prior art. The method ensures the smooth progress of the pressing forming by adding nickel carbonyl powder to the ultra-fine spherical nickel-based alloy powder, and controls the pore structure and permeability of the porous nickel-based alloy material within a certain range by adjusting the amount of nickel carbonyl powder, so as to obtain a porous nickel-based alloy material with low permeability, thereby solving the problem that the ultra-fine spherical nickel-based alloy powder is not easy to be pressed into a porous material.

[0006] To solve the above technical problems, the technical scheme adopted by the present application is as follows: a preparation method of a porous nickel-based alloy material, characterized in that the method comprises the following steps:

[0007] Step one, powder preparation: the ultra-fine spherical nickel-based alloy powder and the nickel carbonyl powder are prepared in proportion, wherein the nickel carbonyl powder accounts for 0.5% to 1.6% of the total mass of the ultra-fine spherical nickel-based alloy powder and the nickel carbonyl powder;

[0008] Step two, powder mixing: the ultra-fine spherical nickel-based alloy powder and the nickel carbonyl powder prepared in step one are loaded into a V-type mixer and mixed uniformly to obtain a mixed powder; the rotation speed for the mixing is 22 revolutions / min to 26 revolutions / min, and the mixing time is 4h to 6h;

[0009] Step three, compression molding: the mixed powder obtained in step two is put into a mold, and then put into a cold isostatic pressing device for compression molding to obtain a green body of the porous nickel-based alloy material; the compression molding is performed at a pressure of 160-200 MPa and a pressure holding time of 20-30 s;

[0010] Step four, sintering: the green body of the porous nickel-based alloy material obtained in step three is sintered in a hydrogen atmosphere to obtain the porous nickel-based alloy material; the sintering is performed at a temperature of 950-1200 °C and a holding time of 1.5-3.5 h.

[0011] The preparation method of the porous nickel-based alloy material has the following advantages:

[0012] The preparation method of the porous nickel-based alloy material has the following advantages: 3 / h-0.4 m 3 / h.

[0013] The preparation method of the porous nickel-based alloy material has the following advantages:

[0014] The preparation method of the porous nickel-based alloy material has the following advantages:

[0015] 1. The ultra-fine spherical nickel-based alloy powder and the carbonyl nickel powder are mixed and then compression molded to obtain the porous nickel-based alloy material by hydrogen sintering. By adding the carbonyl nickel powder to the ultra-fine spherical nickel-based alloy powder, the combination of the ultra-fine spherical nickel-based alloy powder is improved by using the fiber-like structure of the carbonyl nickel powder, and the strength of the green body of the porous nickel-based alloy material is enhanced, thereby solving the problem that the ultra-fine spherical nickel-based alloy powder is not easy to be compression molded to obtain a porous material. At the same time, by adjusting the amount of the carbonyl nickel powder, the pore structure of the porous nickel-based alloy material is adjusted within a certain range, and the permeability is controlled to obtain a porous nickel-based alloy material with low permeability.

[0016] 2. The carbonyl nickel powder with a particle size of 1-5 μm, which is much smaller than the ultra-fine spherical nickel-based alloy powder, is used to reduce the sintering temperature of the ultra-fine spherical nickel-based alloy powder, thereby reducing the preparation cost of the porous nickel-based alloy material.

[0017] 3. The preparation method is low in cost and easy to operate, and the prepared low-cost and low-permeability porous nickel-based alloy material can be applied in heat exchange, filtration and other fields.

[0018] The technical solutions of the present application are further described in detail through examples. DETAILED DESCRIPTION

[0019] Example 1

[0020] The embodiment includes the following steps:

[0021] Step one, powder preparation: proportionally prepare superfine spherical Inconel 625 nickel-based alloy powder with a particle size of -22 μm and carbonyl nickel powder, wherein the mass of the carbonyl nickel powder accounts for 0.5% of the total mass of the superfine spherical Inconel 625 nickel-based alloy powder and the carbonyl nickel powder;

[0022] Step two, powder mixing: uniformly mix the superfine spherical Inconel 625 nickel-based alloy powder and the carbonyl nickel powder prepared in step one in a V-type mixer to obtain mixed powder; the mixing speed is 22 revolutions / min, and the mixing time is 4 h;

[0023] Step three, pressing forming: put the mixed powder obtained in step two into a mold, and then put it into a cold isostatic pressing device for pressing forming to obtain a green body of porous nickel-based alloy material; the pressing forming adopts a pressure of 160 MPa, and the pressure holding time is 30 s;

[0024] Step four, sintering: place the green body of porous nickel-based alloy material obtained in step three in a hydrogen atmosphere with a hydrogen flow of 0.25 m 3 / h for sintering to obtain a porous nickel-based alloy material; the sintering adopts a temperature of 1200℃, and the holding time is 1.5 h.

[0025] It is detected that the maximum pore diameter of the porous nickel-based alloy material prepared in the embodiment is 2.7 μm, and the porosity is 23.5%.

[0026] Example 2

[0027] The embodiment includes the following steps:

[0028] Step one, powder preparation: proportionally prepare superfine spherical Inconel 625 nickel-based alloy powder with a particle size of -16 μm and carbonyl nickel powder, wherein the mass of the carbonyl nickel powder accounts for 1.6% of the total mass of the superfine spherical Inconel 625 nickel-based alloy powder and the carbonyl nickel powder;

[0029] Step two, powder mixing: the superfine spherical Inconel 625 nickel-based alloy powder prepared in step one is mixed with the nickel carbonyl powder in a V-type mixer to obtain a mixed powder; the mixing is performed at a rotation speed of 26 r / min for 6 h;

[0030] Step three, compression molding: the mixed powder obtained in step two is loaded into a mold and then into a cold isostatic pressing device for compression molding to obtain a green body of the porous nickel-based alloy material; the compression molding is performed at a pressure of 200 MPa for 20 s;

[0031] Step four, sintering: the green body of the porous nickel-based alloy material obtained in step three is sintered in a hydrogen atmosphere with a hydrogen flow rate of 0.4 m 3 / h to obtain the porous nickel-based alloy material; the sintering is performed at a temperature of 950 ℃ for 3.5 h.

[0032] It is detected that the maximum pore diameter of the porous nickel-based alloy material prepared in this embodiment is 2.7 μm, and the porosity is 25.5%.

[0033] Embodiment 3

[0034] This embodiment includes the following steps:

[0035] Step one, powder preparation: superfine spherical Inconel 718 nickel-based alloy powder with a particle size of -10 μm is prepared with nickel carbonyl powder in a proportion, wherein the mass of the nickel carbonyl powder accounts for 0.9% of the total mass of the superfine spherical Inconel 718 nickel-based alloy powder and the nickel carbonyl powder;

[0036] Step two, powder mixing: the superfine spherical Inconel 718 nickel-based alloy powder prepared in step one is mixed with the nickel carbonyl powder in a V-type mixer to obtain a mixed powder; the mixing is performed at a rotation speed of 24 r / min for 5 h;

[0037] Step three, compression molding: the mixed powder obtained in step two is loaded into a mold and then into a cold isostatic pressing device for compression molding to obtain a green body of the porous nickel-based alloy material; the compression molding is performed at a pressure of 180 MPa for 25 s;

[0038] Step four, sintering: the green body of the porous nickel-based alloy material obtained in step three is sintered in a hydrogen atmosphere with a hydrogen flow rate of 0.32 m 3 / h to obtain the porous nickel-based alloy material; the sintering is performed at a temperature of 1100 ℃ for 2 h.

[0039] It is detected that the maximum pore diameter of the porous nickel-based alloy material prepared in this embodiment is 2.0 μm, and the porosity is 23.0%.

[0040] The above merely illustrates the preferred embodiments of the present application, but does not impose any limitation on the present application. Any simple modification, change and equivalent variation of the above embodiments according to the technical essence of the present application are still within the protection scope of the technical scheme of the present application.

Claims

1. A method for producing a porous nickel-based alloy material, characterized by, The method comprises the following steps: Step one, powder preparation: superfine spherical nickel-based alloy powder and nickel carbonyl powder are prepared in proportion, wherein the mass of the nickel carbonyl powder accounts for 0.5-1.6% of the total mass of the superfine spherical nickel-based alloy powder and the nickel carbonyl powder; Step two, powder mixing: the superfine spherical nickel-based alloy powder and the nickel carbonyl powder prepared in step one are mixed uniformly in a V-type mixer to obtain mixed powder; the mixing is carried out at a rotation speed of 22-26 r / min for 4-6 h; Step three, pressing forming: the mixed powder obtained in step two is loaded into a mold and then into a cold isostatic pressing device for pressing forming to obtain a green body of a porous nickel-based alloy material; the pressing forming is carried out at a pressure of 160-200 MPa for 20-30 s; Step four, sintering: the green body of the porous nickel-based alloy material obtained in step three is sintered in a hydrogen atmosphere to obtain a porous nickel-based alloy material; the sintering is carried out at a temperature of 950-1200 °C for 1.5-3.5 h; the maximum pore diameter of the porous nickel-based alloy material is not more than 3 μm, and the porosity is not more than 26%.

2. The method of claim 1, wherein the porous nickel-based alloy material is prepared by the steps of: The particle size of the superfine spherical nickel-based alloy powder in step one is -22 μm, -16 μm or -10 μm, and the material is Inconel 625 or Inconel 718.

3. The method for preparing a porous nickel-based alloy material according to claim 1, characterized in that, The hydrogen flow rate during the sintering process in step four is 0.25 m 3 / h~0.4 m 3 / h.