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Powder core thread for reaction synthesis of ternary boride cement cladding and preparation technique

A ternary boride and cermet technology, which is applied in the field of wear-resistant and corrosion-resistant surfaces at room temperature or high temperature, can solve the problems of high porosity, limitation of ternary boride, high cost of vapor deposition, etc., and achieve high temperature wear resistance Corrosion properties, process parameters are easy to control, and the preparation process is simple

Inactive Publication Date: 2009-09-02
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Ternary borides have the advantages of high hardness, good high temperature corrosion resistance, and similar thermal expansion coefficient to steel, but due to poor sinterability and high brittleness of ternary borides, this largely limits the use of ternary boron compound application
The limitations of the thermal spraying method represented by plasma spraying are: the coating is a layered sintered structure, the porosity is high (1-10%), the coating thickness is thin (thickness is generally several hundred microns-2mm), the interface The combination is unstable, and it is difficult to achieve metallurgical bonding between the coating and the substrate. Subsequent heat treatment must be used to improve the bonding strength between the coating and the substrate
The vapor deposition method has high cost and low efficiency, and is suitable for depositing coatings with a thickness of several microns to hundreds of microns on the surface of small-sized workpieces

Method used

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  • Powder core thread for reaction synthesis of ternary boride cement cladding and preparation technique
  • Powder core thread for reaction synthesis of ternary boride cement cladding and preparation technique
  • Powder core thread for reaction synthesis of ternary boride cement cladding and preparation technique

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1: The thickness of the nickel foil is 60 μm, the width is 25 mm, and the length is 250 mm, and the nickel foil is rolled into a cylinder with a diameter of 7-8 mm. The mass fraction of each component in the composite powder is: boron powder (300-200 mesh): 8.4%, molybdenum powder (300-200 mesh): 75%, chromium powder (150-100 mesh): 16.6%. Dry the composite powder at 100°C for 2 hours, put it into a ball mill and mix for 5 hours, pour the mixed composite powder into a nickel foil cylinder, and the mass fraction of the composite powder in the powder core wire is 55% . After the two ends of the cylinder are sealed, the two ends of the round cross-section vermicelli that have been filled with powder are flattened and closed, and then placed in a static pressure mold with grooves, and a static load is applied to the vermicelli by a hydraulic press. The average pressure on the powder core wire is 30MPa, and the pressing time is 10 seconds. After the pressurizati...

Embodiment 2

[0035] Embodiment 2: The thickness of the nickel foil is 100 μm, the width is 28 mm, and the length is 300 mm, and the nickel foil is rolled into a cylinder with a diameter of 8-9 mm. The mass fraction of each component in the composite powder is: boron powder (300-200 order): 7.3%, molybdenum powder (200-150 order): 77.7%, chromium powder (150-100 order): 11%, vanadium powder ( 300-200 mesh): 3%, manganese powder (300-200 mesh): 2%. After drying the composite powder at 100°C for 2 hours, put it into a ball mill and mix for 5 hours, pour the mixed composite powder into a nickel foil cylinder, and the mass fraction of the composite powder in the powder core wire is 70% . After the two ends of the cylinder are sealed, the two ends of the round cross-section vermicelli that have been filled with powder are flattened and closed, and then placed in a static pressure mold with grooves, and a static load is applied to the vermicelli by a hydraulic press. The average pressure on the...

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Abstract

The invention relates to a reaction synthesized Mo-Ni-B family ternary boride metal ceramics fusion cladding layer cord wire and the preparation technology, which belongs to the normal temperature or high temperature wear resistant and corrosion resistant surface technology field. The cored wire is composed of composite powder and nickel foil, and the mass fraction of the composite powder occupying in the cored wire adopts 50 to 75 percent; The mass fractions of the composite powder components in the cored wire adopt the proportion that boron powder occupies 7 to 10 percent, molybdenum powder occupies 70 to 78 percent, vanadium powder occupies 0 to 5 percent, manganese powder occupies 0 to 3 percent, the residual is chromium powder, and the ratio of molybdenum and boron atoms is within the range of 0.8 to 1.2. Through the argon arc or plasma arc fusion cladding technology, Mo-Ni-B family metal ceramics fusion cladding layer cord wire is synthesized in the reaction on the carbon steel, alloy steel and high temperature alloy surface. The reaction synthesized Mo-Ni-B family ternary boride metal ceramics fusion cladding layer cord wire has the advantage that when the higher intensity and toughness of the processed metal component is retained, the surface has excellent high temperature corrosion resistance and wear resistance.

Description

technical field [0001] The invention belongs to the technical field of wear-resistant and corrosion-resistant surfaces at normal temperature or high temperature, and in particular provides a powder core wire for reaction synthesis of a Mo-Ni-B ternary boride cermet cladding layer and a preparation process. Background technique [0002] Ternary borides have the advantages of high hardness, good high temperature corrosion resistance, and similar thermal expansion coefficient to steel, but due to poor sinterability and high brittleness of ternary borides, this limits the use of ternary boron to a large extent. application of compounds. In order to avoid the above disadvantages, ternary borides can be combined with metals to form ceramic-metal composite materials (ie, ternary boride reinforced cermet materials, hereinafter referred to as ternary boride cermets). Ternary boride cermet has high hardness, high toughness and high temperature resistance, and its density is about 3 / 5...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/06C23C4/131
Inventor 刘宗德刘辉李斌何险峰
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)