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A method for in-situ synthesis of molybdenum-silicon-boron alloy coating by laser cladding

A laser cladding and in-situ synthesis technology, which is applied in the coating process and coating of metal materials, can solve the problems of boron volatile loss, complicated preparation process, high melting point, etc., and achieve no crack defects, good bonding, and high composition Tissue even effect

Active Publication Date: 2022-08-02
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The raw material for laser cladding is powder with high sphericity, but due to the high melting point of molybdenum-silicon-boron alloy, the preparation process of molybdenum-silicon-boron alloy powder for laser cladding is complicated and the cost is high
Although molybdenum powder, silicon powder and boron powder can be mixed directly for laser cladding, boron is easy to volatilize and lose at high temperature, which makes the alloy composition after laser cladding deviate greatly from the original composition.

Method used

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  • A method for in-situ synthesis of molybdenum-silicon-boron alloy coating by laser cladding
  • A method for in-situ synthesis of molybdenum-silicon-boron alloy coating by laser cladding

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Embodiment 1

[0027] This embodiment includes the following steps:

[0028] Step 1. Use 200-mesh sandpaper to mechanically grind, degreasing and rust the molybdenum plate to obtain a bright and flat surface as a base material;

[0029] Step 2: Mechanically mixing spherical molybdenum powder, silicon powder and boron carbide powder to obtain mixed powder; the mass content of silicon powder in the mixed powder is 4.5%, the mass content of boron carbide powder is 1.5%, and the balance is spherical Molybdenum powder, and the particle size of spherical molybdenum powder, silicon powder and boron carbide powder are all 200 mesh;

[0030] Step 3: Laser cladding the mixed powder obtained in Step 2 on the substrate selected in Step 1, and in-situ synthesis to obtain a molybdenum-silicon-boron alloy coating with a thickness of 0.2 mm; the laser cladding adopts In the method of coaxial powder feeding, the laser power is 1600W, the diameter of the laser beam spot is 2.5mm, the laser scanning speed is 7m...

Embodiment 2

[0034] This embodiment includes the following steps:

[0035] Step 1. Use 200-mesh sandpaper to mechanically grind, degreasing and rust the molybdenum plate to obtain a bright and flat surface as a base material;

[0036] Step 2: Mechanically mixing spherical molybdenum powder with silicon powder and boron carbide powder to obtain mixed powder; the mass content of silicon powder in the mixed powder is 6%, the mass content of boron carbide powder is 3%, and the remainder is spherical Molybdenum powder, and the particle size of spherical molybdenum powder, silicon powder and boron carbide powder are all 200 mesh;

[0037] Step 3: Laser cladding the mixed powder obtained in Step 2 on the substrate selected in Step 1, and in-situ synthesis to obtain a molybdenum-silicon-boron alloy coating with a thickness of 0.4 mm; the laser cladding adopts In the method of coaxial powder feeding, the laser power is 1800W, the diameter of the laser beam spot is 2.0mm, the laser scanning speed i...

Embodiment 3

[0039] This embodiment includes the following steps:

[0040] Step 1. Use 200-mesh sandpaper to mechanically grind, degreasing and rust the molybdenum plate to obtain a bright and flat surface as a base material;

[0041] Step 2: Mechanically mixing spherical molybdenum powder with silicon powder and boron carbide powder to obtain mixed powder; the mass content of silicon powder in the mixed powder is 3%, the mass content of boron carbide powder is 1%, and the remainder is spherical Molybdenum powder, and the particle size of spherical molybdenum powder, silicon powder and boron carbide powder are all 200 mesh;

[0042] Step 3: Laser cladding the mixed powder obtained in Step 2 on the substrate selected in Step 1, and in-situ synthesis to obtain a molybdenum-silicon-boron alloy coating with a thickness of 0.5 mm; the laser cladding adopts In the method of coaxial powder feeding, the laser power is 1900W, the diameter of the laser beam spot is 1.5mm, the laser scanning speed i...

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Abstract

The invention discloses a method for in-situ synthesis of a molybdenum-silicon-boron alloy coating by laser cladding. The method comprises: first, performing surface pretreatment on a molybdenum plate as a base material; second, mixing spherical molybdenum powder with silicon powder, The boron carbide powder is mechanically mixed to obtain the mixed powder; thirdly, the mixed powder is laser clad on the molybdenum plate base material, and the molybdenum-silicon-boron alloy coating is obtained by in-situ synthesis. The invention adopts boron carbide powder as the boron raw material, which avoids the volatilization loss of the boron raw material under the high temperature condition of laser cladding, which causes a large deviation between the composition of the molybdenum-silicon-boron alloy coating synthesized by the laser cladding and the design composition, and reduces the The cracking tendency of the molybdenum-silicon-boron alloy coating was investigated, and the obtained molybdenum-silicon-boron alloy coating had a uniform composition, no crack defects, good adhesion to the substrate, controllable thickness, and had high strength, high hardness and High temperature oxidation resistance, excellent oxidation protection performance for molybdenum-based materials.

Description

technical field [0001] The invention belongs to the technical field of laser cladding, in particular to a method for in-situ synthesis of a molybdenum-silicon-boron alloy coating by laser cladding. Background technique [0002] Molybdenum is a refractory metal material with a melting point of up to 2623°C. It has high elastic modulus and wear resistance, good electrical and thermal conductivity, low thermal expansion coefficient and other properties. It is widely used in aerospace, nuclear industry and other sectors. It is a very promising high-temperature structural material. However, the high-temperature oxidation resistance of molybdenum is very poor. It begins to oxidize at 300 °C in the air, and the resulting oxide is loose and porous, while the oxygen in the air uses the oxide as a carrier to continue to transfer oxygen to the interior of the substrate. The segregation at the grain boundaries leads to embrittlement or even complete powdering of the molybdenum substrat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C24/10C22C27/04
CPCC23C24/106C22C27/04
Inventor 李尧杨浩刘源张勇张凤英
Owner CHANGAN UNIV
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