Search

CN-121992252-A - Nickel-based self-fluxing alloy powder and preparation method and application thereof

CN121992252ACN 121992252 ACN121992252 ACN 121992252ACN-121992252-A

Abstract

The invention discloses nickel-based self-fluxing alloy powder, and a preparation method and application thereof, and belongs to the technical field of metal surface modification. The nickel-based self-fluxing alloy powder comprises raw materials ：Ni 50%~75%、B 1.0%~5%、Si 2.0%~5.0%、Cr 15%~25%、Mo 2.0%~7.0%、W 1.0%~10.0%、Cu 0.1%~10%、Ta 0.5%~5.0%、Nb 0.5%~5.0%、V 0.3%~5.0% and 1.0% -10% of Co by mass, and the preparation method specifically comprises the following steps of (1) weighing the raw materials, (2) smelting, atomizing, crushing, cooling, dehydrating, drying and screening. The invention can form and protect the martensitic stainless steel base material by adjusting the thermodynamic property of the nickel-based self-fluxing alloy powder, and is especially suitable for the surface strengthening treatment of mechanical parts (such as hammer heads, ball cores and the like) with strict requirements on the bonding strength, the wear resistance and the cracking resistance of the coating.

Inventors

  • Dai Wanxiang
  • LIANG JIABIN
  • LIU HAIBO
  • HE TAO
  • CHEN JIAQI
  • WANG QIYU

Assignees

  • 六盘山实验室

Dates

Publication Date
20260508
Application Date
20260202

Claims (8)

  1. 1. The nickel-based self-fluxing alloy powder is characterized by comprising the following raw materials ：Ni 50%~75%、B 1.0%~5%、Si 2.0%~5.0%、Cr 15%~25%、Mo 2.0%~7.0%、W 1.0%~10.0%、Cu 0.1%~10%、Ta 0.5%~5.0%、Nb 0.5%~5.0%、V 0.3%~5.0% and 1.0% -10% of Co by mass.
  2. 2. The nickel-based self-fluxing alloy powder of claim 1 wherein the total mass fraction of Ta, nb, V, and Co is no more than 15.0%.
  3. 3. The nickel-based self-fluxing alloy powder of claim 1 or 2, further comprising at least one of WC 1.0% -20%, al 2 O 3 1.0.0% -20%, and TiO 2 1.0.0% -2.0%.
  4. 4. The preparation method of the nickel-based self-fluxing alloy powder is characterized by comprising the following steps of: (1) Weighing all raw materials according to the mass fraction of the nickel-based self-fluxing alloy powder in any of claims 1 to 3; (2) And mixing the raw materials, smelting, atomizing, crushing, cooling, dehydrating, drying and sieving to obtain the nickel-based self-fluxing alloy powder.
  5. 5. The method for preparing nickel-based self-fluxing alloy powder of claim 4, wherein in the step (2), the equipment for melting is an intermediate frequency melting furnace, and the temperature is 1300-1500 ℃.
  6. 6. The method for preparing nickel-based self-fluxing alloy powder according to claim 4, wherein in the step (2), the equipment for atomizing and crushing is a tundish, the diameter of a flow guide pipe is 2-5 mm, and the water atomization pressure is 8-18 MPa.
  7. 7. The method of producing a nickel-based self-fluxing alloy powder of claim 4, further comprising the step (3) of ball milling the nickel-based self-fluxing alloy powder with at least one of WC, al 2 O 3 , and TiO.
  8. 8. Use of the nickel-based self-fluxing alloy powder according to any of claims 1-3 or the nickel-based self-fluxing alloy powder produced by the method of any of claims 4-7 in the processing of martensitic stainless steel coatings.

Description

Nickel-based self-fluxing alloy powder and preparation method and application thereof Technical Field The invention relates to the technical field of metal surface modification, in particular to nickel-based self-fluxing alloy powder, and a preparation method and application thereof. Background Martensitic stainless steel refers to stainless steel whose mechanical properties can be adjusted by heat treatment, and is colloquially a type of hardenable stainless steel. Typical grades are Cr13 type, such as 2Cr13, 3Cr13, 4Cr13, etc. The quenching has higher hardness and different tempering temperatures with different combinations of strength and toughness, and is mainly used for steam turbine blades, tableware and surgical instruments. Martensitic stainless steel can be classified into martensitic chromium steel and martensitic chromium nickel steel according to the difference of chemical compositions. Depending on the structure and strengthening mechanism, martensitic stainless steel, martensitic and semi-austenitic (or semi-martensitic) precipitation-hardenable stainless steel, maraging stainless steel, and the like can also be classified. The martensitic stainless steel has good mechanical strength, corrosion resistance and processability, and is widely applied to the manufacture of key parts in the fields of machine manufacturing, engineering machinery and the like. In order to further improve the surface wear resistance and prolong the service life of parts, the technical scheme of preparing the wear-resistant protective coating on the surface of the parts by adopting a supersonic flame spraying technology is commonly adopted in the industry. Although the process can improve the compactness of the coating to a certain extent, the following core problems exist: 1. The process optimization limitation is strong, the traditional solution focuses on adjusting cladding process parameters (such as preheating temperature) or singly adding hard phases (such as SiC and WC), although part of macrocracks can be reduced, microcracks can not be thoroughly eliminated, and the brittleness of the coating is easily increased; 2. the bonding strength is insufficient, the coating prepared by the supersonic flame spraying technology is mostly mechanically bonded with the matrix, the bonding strength is about 80MPa, and the coating is easy to fall off under complex working conditions (such as impact and vibration); 3. Coating thickness limitations-by process limitations, supersonic flame spray processes typically have a coating thickness of about 300 μm, with the greater the thickness, the more severe the coating stress concentration. At present, the nickel-based self-fluxing alloy coating is widely applied to the surface protection of a stainless steel substrate and is metallurgically bonded with the substrate due to simple flame spraying and cladding process and easy operation. The process is based on high temperature heat source of oxygen-acetylene flame to realize melting of alloy powder on the surface of martensitic stainless steel and other base body, and includes the first sand blasting treatment of martensitic stainless steel to raise the binding force between the coating and the base body, the subsequent regulation of oxygen-acetylene flame parameters, selection of neutral flame or slight carbonized flame as heat source, two-step spray welding, the first spraying step of feeding alloy powder containing B, si into flame flow via powder feeder, heating to semi-molten state, depositing the powder onto the surface of base body preheated to 200-300 deg.c to form pre-coating with certain porosity, the second re-smelting step of regulating the flame power to heat the pre-coating to form the final melting of the coating, lowering the melt viscosity with the low-melting eutectic formed with B, si element to break the oxide film on the surface of the base body, and avoiding the micro area fusion and diffusion of the molten alloy and the formation of metallurgical combined interface, and the re-smelting step of needing strict control of flame moving speed and heating temperature to avoid coarse grains caused by overheat of the base body. However, martensitic stainless steel can generate remarkable alpha-gamma phase transformation in the heating and cooling processes, and the nickel-based self-fluxing alloy coating cannot be molded on the martensitic stainless steel due to the problem of difference of thermal expansion coefficients, so that the problem of cracking of the coating cannot be solved. Therefore, how to develop a novel nickel-based self-fluxing alloy coating is a problem that needs to be solved by those skilled in the art. Disclosure of Invention In view of the above, the present invention aims to provide a nickel-based self-fluxing alloy powder, and a preparation method and application thereof, so as to solve the defects in the prior art. In order to achieve the above purpose, the present invention adopts the following