CN111036896A - 17-4PH stainless steel spraying powder material and preparation method thereof - Google Patents

17-4PH stainless steel spraying powder material and preparation method thereof Download PDF

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Publication number
CN111036896A
CN111036896A CN202010047015.9A CN202010047015A CN111036896A CN 111036896 A CN111036896 A CN 111036896A CN 202010047015 A CN202010047015 A CN 202010047015A CN 111036896 A CN111036896 A CN 111036896A
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powder material
percent
stainless steel
powder
temperature
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丁尔
丁梓兴
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Shenzhen Jinzhongrui Communication Technology Co ltd
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Shenzhen Jinzhongrui Communication Technology Co ltd
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    • B22F1/0003—
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F9/00—Making metallic powder or suspensions thereof
    • B22F9/02—Making metallic powder or suspensions thereof using physical processes
    • B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
    • B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
    • B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F9/00—Making metallic powder or suspensions thereof
    • B22F9/02—Making metallic powder or suspensions thereof using physical processes
    • B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
    • B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
    • B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
    • B22F2009/0824—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid with a specific atomising fluid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F9/00—Making metallic powder or suspensions thereof
    • B22F9/02—Making metallic powder or suspensions thereof using physical processes
    • B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
    • B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
    • B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
    • B22F2009/0824—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid with a specific atomising fluid
    • B22F2009/0828—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid with a specific atomising fluid with water
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F9/00—Making metallic powder or suspensions thereof
    • B22F9/02—Making metallic powder or suspensions thereof using physical processes
    • B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
    • B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
    • B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
    • B22F2009/0896—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid particle transport, separation: process and apparatus

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Powder Metallurgy (AREA)

Abstract

The invention relates to a 17-4PH stainless steel spraying powder material and a preparation method thereof, wherein the material comprises the following components in percentage by mass: 15-17% of Cr, 3-5% of Cu, 2-4% of Ni, 0.5-1% of Si, 0.5-1% of Mn, 0.15-0.45% of Nb, 0.03-0.07% of C, 0.01-0.03% of S, 0.01-0.03% of P, 1.2-2% of N and the balance of iron. The spraying powder material provided by the invention can achieve good spraying effect on different base materials by strictly controlling factors such as the proportion of each component in the powder, the morphological characteristics and the like, and meanwhile, other coating materials can be well combined with a 17-4PH stainless steel powder coating when the spraying powder material is used as an intermediate coating.

Description

17-4PH stainless steel spraying powder material and preparation method thereof
Technical Field
The invention relates to the field of material surface engineering, in particular to a 17-4PH stainless steel spraying powder material and a preparation method thereof.
Background
At present, the common surface spraying method mainly comprises a thermal spraying technology and a cold spraying technology. The thermal spraying technique is a processing method which uses gas, liquid fuel or electric arc, plasma arc, laser and the like as a heat source, heats powdered or filiform metal, alloy, ceramic, oxide, carbide, plastic, nylon and composite materials thereof to a molten or semi-molten state, atomizes the powdered or filiform metal, alloy, ceramic, oxide, carbide, plastic, nylon and composite materials thereof by the power of the heat source or by externally adding high-speed airflow, and sprays the atomized. The cold spray technique is a technique of forming a coating by allowing a powder material to remain in an original solid state with supersonic flow without melting or vaporizing the powder material and causing the powder material to collide with a substrate, and the powder material is plastically deformed at a particle body exceeding a critical speed under supersonic collision to form a coating. The material is not affected by heat to cause characteristic change, and the oxidation of the coating film can be controlled to the minimum. However, cold spraying is only suitable for spraying powdery spraying materials directly, but not for rod-shaped or wire-shaped spraying materials, and limits the application range of cold spraying technology.
CN108480156A provides a new cold spray technology (cold melt spray technology), the metal coating substrate generated by the spray method has stronger binding force and less change of physical and chemical properties, but when stainless steel spray operation is performed, the substrate can be damaged in the spray process because other properties such as hardness of the traditional stainless steel are not up to standard, for example, the traditional 17-4PH stainless steel powder has larger diameter, and the reasons such as magnetism and crystal structure are highlighted after the diameter of the stainless steel powder is reduced, so that various problems such as poor adhesion of the coating, irregular coating, low material utilization rate and the like after spray coating are realized, and an effective coating which can be used for industrial purposes is difficult to generate.
Disclosure of Invention
In view of the problems in the prior art, the invention aims to provide a 17-4PH stainless steel spraying powder material and a preparation method thereof, the spraying powder material provided by the invention can achieve good spraying effect on different base materials by strictly controlling factors such as the proportion of each component in the powder, the morphological characteristics and the like, and other coating materials can be well combined with the 17-4PH stainless steel powder coating when the spraying powder material is used as an intermediate coating.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the invention provides a 17-4PH stainless steel spraying powder material, which comprises the following components in percentage by mass: 15-17% of Cr, 3-5% of Cu, 2-4% of Ni, 0.5-1% of Si, 0.5-1% of Mn, 0.15-0.45% of Nb, 0.03-0.07% of C, 0.01-0.03% of S, 0.01-0.03% of P, 1.2-2% of N and the balance of iron.
In the present invention, the content of Cr in the powder material is 15 to 17% by mass, and may be, for example, 15%, 15.2%, 15.4%, 15.6%, 15.8%, 16%, 16.2%, 16.4%, 16.6%, 16.8%, 17%, or the like, but is not limited to the above-mentioned values, and other values not listed in the range are also applicable.
In the present invention, the Cu content in the powder material is 3 to 5% by mass, and may be, for example, 3%, 3.2%, 3.4%, 3.6%, 3.8%, 4%, 4.2%, 4.4%, 4.6%, 4.8%, or 5%, but is not limited to the above-mentioned values, and other values not listed in the range are also applicable.
In the present invention, the Ni content in the powder material is 2 to 4% by mass, and may be, for example, 2%, 2.2%, 2.4%, 2.6%, 2.8%, 3%, 3.2%, 3.4%, 3.6%, 3.8%, or 4%, but is not limited to the above-mentioned values, and other values not listed in the range are also applicable.
In the present invention, the Si content of the powder material is 0.5 to 1% by mass, and may be, for example, 0.5%, 0.55%, 0.6%, 0.65%, 0.7%, 0.75%, 0.8%, 0.85%, 0.9%, 0.95%, or 1%, but is not limited to the listed values, and other values not listed in this range are also applicable.
In the present invention, the Mn content in the powder material is 0.5 to 1% by mass, and may be, for example, 0.5%, 0.55%, 0.6%, 0.65%, 0.7%, 0.75%, 0.8%, 0.85%, 0.9%, 0.95%, or 1%, but is not limited to the listed values, and other values not listed in this range are also applicable.
In the present invention, the Nb content in the powdery material is 0.15 to 0.45% by mass, and may be, for example, 0.15%, 0.18%, 0.21%, 0.24%, 0.27%, 0.3%, 0.33%, 0.36%, 0.39%, 0.42%, or 0.45%, but is not limited to the values listed, and other values not listed in this range are also applicable.
In the present invention, the content of C in the powder material is 0.03 to 0.07% by mass, and may be, for example, 0.03%, 0.034%, 0.038%, 0.042%, 0.046%, 0.05%, 0.054%, 0.058%, 0.062%, 0.066, or 0.07%, etc., but is not limited to the values listed, and other values not listed in this range are also applicable.
In the present invention, the S content in the powder material is 0.01 to 0.03% by mass, and may be, for example, 0.01%, 0.012%, 0.014%, 0.016%, 0.018%, 0.02%, 0.022%, 0.024%, 0.026%, 0.028%, or 0.03%, but is not limited to the listed values, and other values not listed in this range are also applicable.
In the present invention, the content of P in the powder material is 0.01 to 0.03% by mass, and may be, for example, 0.01%, 0.012%, 0.014%, 0.016%, 0.018%, 0.02%, 0.022%, 0.024%, 0.026%, 0.028%, or 0.03%, but is not limited to the listed values, and other values not listed in this range are also applicable.
In the present invention, the content of N in the powder material is 1.2 to 2% by mass, and may be, for example, 1.2%, 1.28%, 1.36%, 1.44%, 1.52%, 1.6%, 1.68%, 1.76%, 1.84%, 1.92%, or 2%, but is not limited to the listed values, and other values not listed in this range are also applicable.
According to the invention, through selecting the components of the 17-4PH stainless steel spraying powder material and through reasonably proportioning the components, the powder material can achieve a good spraying effect when applied to different base materials by using a cold-melting spraying technology, and can achieve good bonding performance with other materials when used as an intermediate coating.
As a preferable technical scheme of the invention, the paint comprises the following components in percentage by mass: 15-17% of Cr, 78-5% of Cu3, 3-3.5% of Ni, 0.5-1% of Si, 0.5-1% of Mn, 0.15-0.45% of Nb, 0.03-0.07% of C, 0.01-0.03% of S, 0.01-0.03% of P, 1.2-2% of N and the balance of Fe.
In a preferred embodiment of the present invention, the powder material has a particle diameter of 0.002 to 0.02mm, for example, 2 μm, 3 μm, 4 μm, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm or 10 μm, but is not limited to the above-mentioned values, and other values not listed in this range are also applicable.
Preferably, the particle hardness of the powder material is 120-220Hv, for example 120Hv, 130Hv, 140Hv, 160Hv, 170Hv, 180Hv, 190Hv, 200Hv, 210Hv or 220Hv, but is not limited to the listed values, and other values not listed in this range are equally applicable.
Preferably, the particle out-of-roundness of the powder material is 60% or more, for example, 60%, 62%, 64%, 66%, 68%, 70%, 72%, 74%, 76%, 78%, 80%, 82%, 84%, 86%, 88%, 90%, 92%, 94%, 96%, 98%, etc., but is not limited to the recited values, and other values not recited in this range are equally applicable.
Preferably, the powder material has a relative permeability of 1.009-1.015, which may be, for example, 1.009, 1.0092, 1.0094, 1.0096, 1.0098, 1.01, 1.012, 1.014 or 1.015, etc., but is not limited to the values listed, and other values not listed in this range are equally applicable.
Preferably, the powdered material has an oxygen content of 0.05% or less, and may be, for example, 0.05%, 0.048%, 0.046%, 0.044%, 0.042%, 0.04%, 0.038%, 0.036%, 0.034%, 0.032%, 0.03%, 0.028%, 0.026%, 0.024%, 0.022%, or 0.02%, but is not limited to the values listed, and other values not listed in this range are equally applicable.
In the invention, the reasonable configuration of the element composition in the powder material, the morphological characteristics of the material and other factors realizes that good effect can be achieved on different base materials, and other coating materials can be well combined with the 17-4PH stainless steel powder coating when the powder material is used as an intermediate coating.
In a second aspect, there is provided a method of preparing the powder material of the first aspect, the method comprising the steps of:
(1) heating the 17-4PH stainless steel coarse powder into liquid;
(2) atomizing and condensing the liquid obtained in the step (1);
(3) screening the product obtained in the step (2);
(4) and (4) demagnetizing the screened product obtained in the step (3), and then obtaining the powder material.
As a preferred embodiment of the present invention, the coarse powder of 17-4PH stainless steel in step (1) has a particle size of 30 μm or more, for example, 30 μm, 35 μm, 40 μm, 45 μm, 50 μm, 55 μm, 60 μm, 65 μm, 70 μm, 75 μm, 80 μm, 85 μm, 90 μm or 95 μm, but is not limited to the values listed, and other values not listed in the range are also applicable.
As a preferred embodiment of the present invention, the temperature of the thermal vaporization in the step (1) is 1250-.
As a preferable technical scheme of the invention, the atomization and condensation mode in the step (2) is water-gas combined atomization.
Preferably, the temperature of the atomized condensation in step (2) is 1150-.
As a preferred embodiment of the present invention, the sieve size of the sieve in the step (2) is 2 to 10 μm, and may be, for example, 2 μm, 3 μm, 4 μm, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm or 10 μm, but is not limited to the above-mentioned values, and other values not listed in the above range are also applicable.
As a preferable technical scheme of the invention, the degaussing in the step (3) comprises a heating process and a heat preservation process after cooling.
Preferably, the temperature during the heating process is 1250-.
Preferably, the temperature in the heat preservation process after temperature reduction is 850-.
Preferably, the holding time in the post-cooling holding process is 1 to 3 hours, for example, 1 hour, 1.2 hours, 1.4 hours, 1.6 hours, 1.8 hours, 2 hours, 2.2 hours, 2.4 hours, 2.6 hours, 2.8 hours or 3 hours, etc., but not limited to the listed values, and other values not listed in the range are also applicable.
As a preferred technical scheme of the invention, the preparation method comprises the following steps:
(1) heating the 17-4PH stainless steel coarse powder with the particle size of more than or equal to 30 mu m to be liquid at 1250-1330 ℃;
(2) atomizing and condensing the liquid obtained in the step (1) at the temperature of 1150-; wherein the atomization and condensation mode is water-gas combined atomization;
(3) screening the product obtained in the step (2); wherein the size of the screened mesh is 2-10 μm;
(4) and (4) heating the screened product obtained in the step (3) to 1250-.
Compared with the prior art, the invention has the following beneficial effects:
(1) the 17-4PH stainless steel spraying powder material provided by the invention can generate a stable, attached, compact and concentrated coating after cold spraying, and also has most of physicochemical characteristics such as structural performance, conductivity, corrosion resistance and the like of the 17-4PH stainless steel.
(2) The 17-4PH stainless steel spraying powder material provided by the invention can be used as an intermediate coating due to good bonding performance with other materials.
Detailed Description
To better illustrate the invention and to facilitate the understanding of the technical solutions thereof, typical but non-limiting examples of the invention are as follows:
example 1
The embodiment provides a 17-4PH stainless steel spraying powder material which comprises the following components in percentage by mass: cr 16%, Cu 5%, Ni 2%, Si 1%, Mn 0.5%, Nb 0.15%, C0.04%, S0.01%, P0.01%, N1.5%, and the balance of iron. The powder material has a powder particle diameter length of 2-4 μm; the particle hardness of the powder material is 180 Hv; the out-of-roundness of the particles of the powder material is more than or equal to 70 percent; the relative magnetic permeability of the powder material is 1.015; the oxygen content of the powder material is less than or equal to 0.05 percent.
The preparation method of the powder material comprises the following steps:
(1) heating 17-4PH stainless steel coarse powder with the particle size of more than or equal to 300 mu m at 1300 ℃ to form liquid;
(2) atomizing and condensing the liquid obtained in the step (1) at 1180 ℃; wherein the atomization and condensation mode is water-gas combined atomization;
(3) screening the product obtained in the step (2); wherein the size of the screened mesh is 2-4 μm;
(4) and (4) heating the screened product obtained in the step (3) to 1250 ℃, cooling to 855 ℃, preserving heat for 1.8h, and performing demagnetization treatment to obtain the powder material.
The obtained powder material is sprayed on an aluminum-based material by using a cold-melting spray coating technology, and the hardness test, the adhesion test and the salt spray test are carried out on the obtained coating; the specific test values are detailed in table 1.
Example 2
The embodiment provides a 17-4PH stainless steel spraying powder material which comprises the following components in percentage by mass: 15.5% of Cr, 3% of Cu, 4% of Ni, 0.4% of Si, 0.6% of Mn, 0.15% of Nb, 0.07% of C, 0.03% of S, 0.03% of P, 1.8% of N and the balance of iron. The powder material has a powder particle diameter length of 7-9.5 μm; the particle hardness of the powder material is 125 Hv; the out-of-roundness of the particles of the powder material is more than or equal to 90 percent; the relative magnetic permeability of the powder material is 1.015; the oxygen content of the powder material is less than or equal to 0.05 percent.
The preparation method of the powder material comprises the following steps:
(1) heating coarse powder of stainless steel with a pH of 17-4 and a particle size of more than or equal to 80 μm at 1330 ℃ to obtain liquid;
(2) atomizing and condensing the liquid obtained in the step (1) at the temperature of 1150 ℃; wherein the atomization and condensation mode is water-gas combined atomization;
(3) screening the product obtained in the step (2); wherein the size of the screened mesh is 7-9.5 μm;
(4) and (4) heating the screened product obtained in the step (3) to 1260 ℃, cooling to 900 ℃, preserving heat for 2h, and performing demagnetization treatment to obtain the powder material.
The obtained powder material is sprayed on a titanium-based material by using a cold-melting spray coating technology, and the hardness test, the adhesion test and the salt spray test are carried out on the obtained coating; the specific test values are detailed in table 1.
Example 3
The embodiment provides a 17-4PH stainless steel spraying powder material which comprises the following components in percentage by mass: cr 17%, Cu 5%, Ni 3.8%, Si 0.7%, Mn 0.7%, Nb 0.45%, C0.07%, S0.02%, P0.02%, N2%, and the balance of iron. The powder material has a powder particle diameter length of 5-7 μm; the particle hardness of the powder material is 220 Hv; the out-of-roundness of the particles of the powder material is more than or equal to 80 percent; the relative magnetic permeability of the powder material is 1.012; the oxygen content of the powder material is less than or equal to 0.05 percent.
The preparation method of the powder material comprises the following steps:
(1) heating blocky stainless steel coarse powder with the pH of 17-4 to form liquid at the temperature of 1255 ℃;
(2) atomizing and condensing the liquid obtained in the step (1) at the temperature of 1200 ℃; wherein the atomization and condensation mode is water-gas combined atomization;
(3) screening the product obtained in the step (2); wherein the size of the screened mesh is 5-7 μm;
(4) and (4) heating the screened product obtained in the step (3) to 1330 ℃, cooling to 880 ℃, preserving heat for 3 hours, and performing demagnetization treatment to obtain the powder material.
The obtained powder material is sprayed on an aluminum alloy base material by using a cold melting spray coating technology, and the hardness test, the adhesion test and the salt spray test are carried out on the obtained coating; the specific test values are detailed in table 1.
Example 4
The embodiment provides a 17-4PH stainless steel spraying powder material which comprises the following components in percentage by mass: 15.3% of Cr, 4.2% of Cu, 2.2% of Ni, 0.52% of Si, 0.55% of Mn, 0.18% of Nb, 0.04% of C, 0.015% of S, 0.015% of P, 1.8% of N and the balance of iron. The powder material has a powder particle diameter length of 2-5 μm; the particle hardness of the powder material is 210 Hv; the out-of-roundness of the particles of the powder material is more than or equal to 70 percent; the relative magnetic permeability of the powder material is 1.011; the oxygen content of the powder material is less than or equal to 0.05 percent.
The preparation method of the powder material comprises the following steps:
(1) heating a block of 17-4PH stainless steel meal to a liquid at 1290 ℃;
(2) atomizing and condensing the liquid obtained in the step (1) at 1215 ℃; wherein the atomization and condensation mode is water-gas combined atomization;
(3) screening the product obtained in the step (2); wherein the size of the screened mesh is 2-5 μm;
(4) and (4) heating the screened product obtained in the step (3) to 1300 ℃, cooling to 865 ℃, preserving heat for 1h, and performing demagnetization treatment to obtain the powder material.
The obtained powder material is sprayed on a resin-based material by using a cold-melting spray coating technology, and the hardness test, the adhesion test and the salt spray test are carried out on the obtained coating; the specific test values are detailed in table 1.
Example 5
The embodiment provides a 17-4PH stainless steel spraying powder material which comprises the following components in percentage by mass: 16.5% of Cr, 3.2% of Cu, 3.8% of Ni, 0.9% of Si, 0.9% of Mn, 0.4% of Nb, 0.06% of C, 0.01% of S, 0.01% of P, 1.2% of N and the balance of iron. The powder material has a powder particle diameter length of 5-9 mm; the particle hardness of the powder material is 150 Hv; the out-of-roundness of the particles of the powder material is more than or equal to 90 percent; the relative magnetic permeability of the powder material is 1.011; the oxygen content of the powder material is less than or equal to 0.05 percent.
The preparation method of the powder material comprises the following steps:
(1) heating a block of 17-4PH stainless steel meal to a liquid at 1290 ℃;
(2) atomizing and condensing the liquid obtained in the step (1) at 1180 ℃; wherein the atomization and condensation mode is water-gas combined atomization;
(3) screening the product obtained in the step (2); wherein the size of the screened mesh is 5-9 μm;
(4) and (4) heating the screened product obtained in the step (3) to 1250 ℃, cooling to 860 ℃, preserving heat for 1.7h, and performing demagnetization treatment to obtain the powder material.
The obtained powder material is sprayed on a magnesium alloy base material by using a cold melting spray coating technology, and the hardness test, the adhesion test and the salt spray test are carried out on the obtained coating; the specific test values are detailed in table 1.
Example 6
Spraying a magnesium alloy coating on the base material sprayed with the powder coating obtained in the example 2, and performing hardness test, adhesion test and salt spray test on the obtained coating; the specific test results are detailed in table 1.
Comparative example 1
The difference from the example 2 is that the powder material is not treated by the preparation method, spraying is directly carried out, and the obtained coating is subjected to hardness test, adhesion test and salt spray test; the specific test values are detailed in table 1.
The hardness test of the coating adopts a micro Vickers hardness tester, a test head selects a diamond regular rectangular pyramid pressure head, the pressure F is 0.3Kgf, and the pressure is maintained for 10 s; the adhesion test of the coating is carried out according to GB/T9286, and the adhesive tape (NICIBANST 405AP-24 adhesive paper) with the adhesive force of 10N/25mm is used for the test, and the adhesive paper is pulled off within 1 s; the salt spray test of the coating was: in a closed environment at 35 +/-2 ℃, the humidity is more than 85 percent, the pH value is in the range of 6.5-7.2, and 5 percent NaCl solution is used for continuously spraying salt water on the surface of the coating for 48 hours. Wherein, the adhesive force judgment standard is as follows: the quality of the adhesive force is divided into 6 grades, and the quality is 5B, 4B, 3B, 2B, 1B and 0B in sequence from good to bad; the above grades have the following meanings:
Figure BDA0002369793030000111
the salt spray test standards have the following specific standards and phenomena:
Figure BDA0002369793030000112
Figure BDA0002369793030000121
table 1 test values in each of examples and comparative examples
Figure BDA0002369793030000122
It can be seen from the results of the above examples and comparative examples that the selection of the components in the 17-4PH stainless steel powder material provided by the invention and the reasonable proportion of the components realize that the powder material can achieve good spraying effect when applied to different substrates by using the cold-melt spraying technology, and can achieve good bonding performance with other materials when used as an intermediate coating.
The preferred embodiments of the present invention have been described in detail, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.

Claims (10)

1. The 17-4PH stainless steel spraying powder material is characterized by comprising the following components in percentage by mass: 15-17% of Cr, 3-5% of Cu, 2-4% of Ni, 0.5-1% of Si, 0.5-1% of Mn, 0.15-0.45% of Nb, 0.03-0.07% of C, 0.01-0.03% of S, 0.01-0.03% of P, 1.2-2% of N and the balance of iron.
2. The powder material of claim 1, comprising the following components in percentage by mass: 15.5 to 16 percent of Cr, 4 to 4.5 percent of Cu, 3 to 3.5 percent of Ni, 0.7 to 0.8 percent of Si, 0.6 to 0.9 percent of Mn0.2 to 0.4 percent of Nb, 0.04 to 0.06 percent of C, 0.015 to 0.02 percent of S, 0.013 to 0.026 percent of P, 1.5 to 1.8 percent of N and the balance of iron.
3. A powdered material according to claim 1 or 2, characterised in that the powdered material has a powder particle size of 2-10 μm;
preferably, the particle hardness of the powder material is 120-220 Hv;
preferably, the out-of-roundness of the particles of the powder material is more than or equal to 60 percent;
preferably, the relative permeability of the powder material is 1.009-1.015;
preferably, the oxygen content of the powder material is less than or equal to 0.05%.
4. A method for preparing a powdered material according to any one of claims 1-3, characterised in that the method comprises the steps of:
(1) heating the 17-4PH stainless steel coarse powder into liquid;
(2) atomizing and condensing the liquid obtained in the step (1);
(3) screening the product obtained in the step (2);
(4) and (4) demagnetizing the screened product obtained in the step (3), and then obtaining the powder material.
5. The method of claim 4, wherein the coarse 17-4PH stainless steel powder of step (1) has a particle size of 30 μm or more.
6. The method according to claim 4 or 5, wherein the heating temperature in step (1) is 1250-.
7. The preparation method according to any one of claims 4 to 6, wherein the atomization condensation in the step (2) is combined atomization of water and gas;
preferably, the temperature of the atomization condensation in the step (2) is 1150-1200 ℃.
8. The production method according to any one of claims 4 to 7, wherein the mesh size of the screen in the step (2) is 2 to 10 μm.
9. The method according to any one of claims 4 to 8, wherein the degaussing in step (3) comprises a heating process and a temperature-holding process after cooling;
preferably, the temperature during the heating process is 1250-;
preferably, the temperature in the heat preservation process after temperature reduction is 850-900 ℃;
preferably, the heat preservation time in the heat preservation process after the temperature reduction is 1-3 h.
10. The method of any one of claims 4 to 9, comprising the steps of:
(1) heating the 17-4PH stainless steel coarse powder with the particle size of more than or equal to 30 mu m to be liquid at 1250-1330 ℃;
(2) atomizing and condensing the liquid obtained in the step (1) at the temperature of 1150-; wherein the atomization and condensation mode is water-gas combined atomization;
(3) screening the product obtained in the step (2); wherein the size of the screened mesh is 2-10 μm;
(4) and (4) heating the screened product obtained in the step (3) to 1250-.
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