CN-121755699-B - Iron-based alloy powder and preparation method thereof

CN121755699BCN 121755699 BCN121755699 BCN 121755699BCN-121755699-B

Abstract

The application relates to the technical field of alloy materials, in particular to iron-based alloy powder and a preparation method thereof, wherein the iron-based alloy powder comprises an iron-based alloy body and a surface modification component coated on the surface of the iron-based alloy body, and the iron-based alloy body comprises, by mass, 18-22% of Cr, 3-5% of Mo, 3-6% of W+V, 0.8-1.5% of Ti, 0.5-1% of Ce, 2.5-3.5% of C, and the balance of Fe and unavoidable impurities. The preparation method of the iron-based alloy powder comprises the steps of 1, preparing alloy powder, carrying out vacuum induction melting on the alloy powder, then carrying out gas atomization powder preparation to obtain an iron-based alloy body, and 2, adding a surface modification component into the iron-based alloy body, carrying out dispersion coating treatment and low-temperature crystallization stabilization treatment to obtain the iron-based alloy powder. The prepared iron-based alloy powder has stable mechanical property, outstanding oxidation resistance and wear resistance and good forming property.

Inventors

JIANG XIAOHUA
KANG JIANMING
CHEN ZIJIN
Ding Zailong

Assignees

上海铸宇材料科技有限公司

Dates

Publication Date: 20260508
Application Date: 20260303

Claims (4)

1. The iron-based alloy powder is characterized by comprising an iron-based alloy body and a surface modification component coated on the surface of the iron-based alloy body, wherein the iron-based alloy body comprises, by mass, 18-22% of Cr, 3-5% of Mo, 3-6% of W+V, 0.8-1.5% of Ti, 0.5-1% of Ce, 2.5-3.5% of C, and the balance of Fe and unavoidable impurities, the surface modification component comprises a surfactant and a lubricant in a mass ratio of 10-12:5-7, and the chemical components also satisfy the quantitative relation of 0.1 ++C/Cr+Mo+V+Ti ++Ti ++0.12, wherein the mass percentages of [ C ], [ Cr ], [ Mo ], [ W+V ] and [ Ti ] are C, cr, mo, W + V, ti respectively; the mass ratio of W to V in the chemical components is 4-8:1-3; the preparation method of the iron-based alloy powder comprises the following preparation steps: Step 1, weighing Fe powder, cr powder, mo powder, W powder, V powder, ti powder, ce powder and graphite powder according to mass percentage, and carrying out vacuum drying, crushing, sieving, grinding and mixing to obtain alloy powder; Step 2, adding a surface modification component into the iron-based alloy body, adopting dispersion coating treatment, carrying out vacuum drying and low-temperature crystallization stabilization treatment, and screening to obtain iron-based alloy powder; The vacuum induction smelting in the step 1 specifically comprises the steps of heating from room temperature to 800-900 ℃ at a heating rate of 5-8 ℃ per minute under the vacuum degree of less than or equal to 5Pa, preserving heat for 10-15min, heating to 1350-1450 ℃ at a heating rate of 8-12 ℃ per minute, preserving heat for 15-20min, and heating to 1580-1650 ℃ at a heating rate of 3-5 ℃ per minute, and preserving heat for 20-30min; The vacuum deoxidization treatment in the step 1 is specifically that the temperature is kept for 2-3 hours under the conditions that the vacuum degree is less than or equal to 5Pa and the temperature is 200-250 ℃, and then the vacuum cooling is carried out to the room temperature at the cooling rate of 15-20 ℃ per minute; The low-temperature crystallization stabilization treatment in the step 2 specifically comprises the steps of raising the temperature to 120-150 ℃ at the temperature raising rate of 3-5 ℃ per minute, preserving the heat for 1-2h, and naturally cooling to room temperature.
2. The iron-based alloy powder according to claim 1, wherein the surfactant is one or more of titanate coupling agent, polyoxyethylene stearate and gamma-aminopropyl triethoxysilane, and the lubricant is one or more of nano zinc stearate, microcrystalline wax micropowder and polytetrafluoroethylene micropowder.
3. The iron-based alloy powder according to claim 1, wherein the atomizing medium for the gas atomization powder preparation in the step 1 is argon, the atomizing pressure is 6-8MPa, and the temperature of the atomizing medium is controlled to be-10 ℃ to-0 ℃.
4. The iron-based alloy powder according to claim 1, wherein the surface modifying component is added in an amount of 0.8-1.5% by mass of the iron-based alloy body in step 2.

Description

Iron-based alloy powder and preparation method thereof Technical Field The application relates to the technical field of alloy materials, in particular to iron-based alloy powder and a preparation method thereof. Background The hydraulic support is core equipment for comprehensive mechanized coal mining of coal mines, key components such as upright posts and the like are in complex working conditions of underground high load, strong corrosion and coal-rock impact for a long time, abrasion and corrosion failure are extremely easy to occur on the surface, and the safety and the efficiency of comprehensive coal mining operation are seriously affected. The laser cladding technology is a main stream means for protecting the surface of a key part of a hydraulic support because of strong coating binding force and excellent performance, and the performance of cladding powder directly determines the protection effect. At present, nickel-based alloy powder is mostly adopted for laser cladding in the industry, but the nickel-based alloy powder has the obvious defects of high cost, low hardness, difficulty in resisting underground high-load abrasion and easiness in cracking of a coating due to large difference of thermal expansion coefficients of the nickel-based alloy powder and a steel matrix. The existing iron-based laser cladding powder has the defects of low cost, low carbide generation rate, low cladding layer density, poor powder flowability and wettability, uneven spreading during laser cladding, weak bonding force between a coating and a substrate, poor oxygen content control, more oxide inclusions, difficult corrosion resistance meeting the requirement of underground working conditions and incapability of adapting to the protection requirement of a hydraulic support, and the technical problem of inversion of hardness and toughness is generally solved. Therefore, the iron-based laser cladding powder with high hardness, high toughness, corrosion resistance and excellent fluidity is developed to solve the technical problems of the prior material, such as short performance plate, reduction of the protection cost of the hydraulic support and urgent need to be solved in the field. Disclosure of Invention In order to solve the technical problems mentioned in the background art, the application provides iron-based alloy powder and a preparation method thereof. The application provides iron-based alloy powder, which adopts the following technical scheme: The iron-based alloy powder comprises an iron-based alloy body and a surface modification component coated on the surface of the iron-based alloy body, wherein the iron-based alloy body comprises, by mass, 18-22% of Cr, 3-5% of Mo, 3-6% of W+V, 0.8-1.5% of Ti, 0.5-1% of Ce, 2.5-3.5% of C, and the balance of Fe and unavoidable impurities, and the surface modification component consists of a surfactant and a lubricant in a mass ratio of 10-12:5-7. Preferably, the chemical components also meet the quantitative relation that the content of [ C ]/([ Cr ] + [ Mo ] + [ W+V ] + [ Ti ]) is less than or equal to 0.1 and less than or equal to 0.12, wherein the mass percentage content of [ C ], [ Cr ], [ Mo ], [ W+V ], [ Ti ] is C, cr, mo, W + V, ti respectively. Preferably, the mass ratio of W to V in the chemical components is 4-8:1-3. Preferably, the surfactant is one or more of titanate coupling agent, polyoxyethylene stearate and gamma-aminopropyl triethoxysilane. Preferably, the lubricant is one or more of nano zinc stearate, microcrystalline wax micropowder and polytetrafluoroethylene micropowder. The application also provides a preparation method of the iron-based alloy powder, which adopts the following technical scheme; the preparation method of the iron-based alloy powder comprises the following preparation steps: Step 1, weighing Fe powder, cr powder, mo powder, W powder, V powder, ti powder, ce powder and graphite powder according to mass percentage, and carrying out vacuum drying, crushing, sieving, grinding and mixing to obtain alloy powder; And 2, adding a surface modification component into the iron-based alloy body, adopting dispersion coating treatment, carrying out vacuum drying and low-temperature crystallization stabilization treatment, and screening to obtain the iron-based alloy powder. Preferably, the vacuum induction smelting in the step 1 specifically comprises the steps of heating from room temperature to 800-900 ℃ at a heating rate of 5-8 ℃ per minute under the vacuum degree of less than or equal to 5Pa, preserving heat for 10-15min, heating to 1350-1450 ℃ at a heating rate of 8-12 ℃ per minute, preserving heat for 15-20min, and heating to 1580-1650 ℃ at a heating rate of 3-5 ℃ per min, and preserving heat for 20-30min. Preferably, the atomization medium for the gas atomization powder preparation in the step 1 is argon, the atomization pressure is 6-8MPa, and the temperature of the atomization medium is controlled to be-10-0 ℃. Preferably, the vacuum