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Low-burning-loss abrasive coating material and application thereof

A technology of coating materials and wear, applied in the direction of coating, metal material coating process, molten spraying, etc., can solve the problems of inability to exert superior characteristics, low deposition rate of thermal spraying, poor adhesion, etc., to reduce loss, Effect of increasing component content and easy deposition

Active Publication Date: 2020-03-10
BEIJING MINING & METALLURGICAL TECH GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the rapid oxidation of hBN components in the air at 900°C, light weight, poor plasticity, and poor adhesion, it is easy to burn out in the thermal spraying flame, not easy to accelerate, and easy to scatter after hitting the substrate, etc., resulting in its heat loss. The spray deposition rate is very low, and the superior characteristics of this component cannot be exerted

Method used

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  • Low-burning-loss abrasive coating material and application thereof
  • Low-burning-loss abrasive coating material and application thereof
  • Low-burning-loss abrasive coating material and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Step 1: Select lamellar hBN with a graphitization index of 1.4, a purity of 99.6%, and a primary particle size of 3-20 μm as the raw material, and its microscopic appearance is as follows: figure 1 shown;

[0034] Step 2: Prepare the powder mixture of Ni-15Cr-10Fe (particle size 45-105 μm), Al (particle size 0.1-3 μm) and hBN according to the mass ratio of 9:1:1, and stir evenly;

[0035] Step 3: adding polyvinyl alcohol (number average molecular weight 77,000) accounting for 3% of the total weight of the materials in step 2 as a binder, and adopting a mechanical coating process to prepare nickel-based boron nitride composite powder.

Embodiment 2

[0039] Step 1: Select lamellar hBN with a graphitization index of 1.8, a purity of 99.6%, and a primary particle size of 6-30 μm as a raw material;

[0040] Step 2: Prepare the powder mixture of Al-12Si (particle size 3-45 μm) and hBN according to the mass ratio of 4:1, and stir evenly;

[0041] Step 3: Add polyvinyl alcohol (number average molecular weight 77,000) accounting for 5% of the total weight of the materials in step 2 as a binder, and prepare aluminum-silicon-boron nitride composite powder by using a mechanical coating process.

Embodiment 3

[0045] Step 1: select lamellar hBN with a graphitization index of 2.0, a purity of 99.5%, and a primary particle size of 3-20 μm as a raw material;

[0046] Step 2: Prepare a powder mixture of Ni-5Si (particle size 1-45 μm), hBN and graphite (particle size 5-38 μm) according to the mass ratio of 5:1:1, and stir evenly;

[0047] Step 3: Add water glass (modulus 2.4, density 1.3g / cm2) that accounts for 8% of step 2 material gross weight 3 ) as a binder, a nickel-silicon-boron nitride composite sprayed rod is prepared by adopting a cold-bonding extrusion process, the diameter of the rod is 4.75mm, and the length is 400-600mm.

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Abstract

The invention belongs to the technical field of coating materials, and particularly relates to a low-burning-loss abrasive coating material and an application thereof. The low-burning-loss abrasive coating material provided by the invention comprises an abrasive component and a framework component, wherein the abrasive component comprises hexagonal boron nitride, the graphitization index of the hexagonal boron nitride is 0.7-2.0, and the pattern of the hexagonal boron nitride is lamellar. The hexagonal boron nitride having specific graphitization indexes and specific pattern is selected as theabrasive component, so that the loss of a boron nitride system abrasive coating material in the hot spraying process can be effectively reduced, the content of boron nitride components in the coatingcan be increased, the abradability of the coating can be improved, and the low-burning-loss abrasive coating material has great application prospects in aircraft engines and combustion turbines.

Description

technical field [0001] The invention belongs to the technical field of coating materials, in particular to a low-burning wearable coating material and its application. Background technique [0002] The abradable sealing coating is coated on the surface of the stator part of the aero-engine, and it can be actively worn when it is rubbed against the rotor part under high temperature and high speed conditions, so that the minimum gap between the rotor and the stator can be realized through the interference fit of the rotor and the stator At the same time, it protects the rotor components from wear, which is of great significance for reducing the fuel consumption of gas turbines, improving efficiency and operating safety. The abradable sealing coating is composed of an abradable component and a skeleton component. The abradable component is generally a low-shear strength non-metallic material such as graphite, hexagonal boron nitride, polyphenylene, etc., providing the abradable...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/06C23C4/04
CPCC23C4/04C23C4/06
Inventor 于月光刘建明沈婕章德铭郭丹王帅刘通黄凌峰卢晓亮侯伟骜周恒
Owner BEIJING MINING & METALLURGICAL TECH GRP CO LTD
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