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A micron-scale supersonic suspension plasma spraying device and spraying method

A spraying device and plasma technology, applied in coating, fusion spraying, metal material coating process, etc., can solve the problems of low coating preparation efficiency, improve coating preparation efficiency, ensure effective melting, and increase melting degree Effect

Active Publication Date: 2019-11-22
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the CN105648390A technology is only specific to the hydroxyapatite system, and has nothing to do with the rest of the spraying system, and requires the particle size of the spraying powder to be below 1 μm, the feeding flow rate to be on the order of ml / min, and the coating preparation efficiency is low

Method used

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  • A micron-scale supersonic suspension plasma spraying device and spraying method
  • A micron-scale supersonic suspension plasma spraying device and spraying method
  • A micron-scale supersonic suspension plasma spraying device and spraying method

Examples

Experimental program
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Effect test

Embodiment example 1

[0034] Step 1: Preparation of suspended lanthanum zirconate slurry: Weigh spherical lanthanum zirconate powder with a particle size of 7-90 μm, absolute ethanol, polyethyleneimine, and deionized water with an electronic balance, according to the mass ratio of 0.20: 0.20:0.05:0.55 is placed in an open beaker, fully stirred with a fully automatic mechanical stirring device to form a suspension slurry. After testing, the pH of the suspension slurry is 8, and the stability and dispersibility are good;

[0035] Step 2: Surface pretreatment of the iron-based substrate: cutting the iron-based substrate into 10×10×2mm by wire cutting method 3 There are several block samples, and they are roughened with 60-mesh corundum sand with a pressure of 0.3-0.5 MPa to remove impurities such as oil stains on the surface of the substrate. The sandblasting angle is 60-90°, and the sandblasting distance is 5-10cm; after sandblasting, it is cleaned with anhydrous ethanol for 30 minutes, and the ultr...

Embodiment example 2

[0039] Step 1: Preparation of suspended lanthanum zirconate slurry: Weigh spherical lanthanum zirconate powder with a particle size of 7-90 μm, absolute ethanol, polyethyleneimine and deionized water with an electronic balance, and weigh them in a mass ratio of 0.22: 0.22:0.05:0.51 is placed in an open beaker, fully stirred with a fully automatic mechanical stirring device to form a suspension slurry. After testing, the pH of the suspension slurry is between 7 and 8, and the stability and dispersibility are good;

[0040] Step 2: Surface pretreatment of the iron-based substrate: cutting the iron-based substrate into 10×10×2mm by wire cutting method 3 There are several block samples, and they are roughened with 60-mesh corundum sand with a pressure of 0.3-0.5 MPa to remove impurities such as oil stains on the surface of the substrate. The sandblasting angle is 60-90°, and the sandblasting distance is 5-10cm; after sandblasting, it is cleaned with anhydrous ethanol for 30 minut...

Embodiment example 3

[0044] Step 1: Preparation of suspended molybdenum silicide slurry: weigh molybdenum silicide powder, absolute ethanol, polyvinyl alcohol, and deionized water with a particle size of 0.5-25 μm with an electronic balance, and weigh them in a mass ratio of 0.20:0.20:0.05:0.55 Put it in an open beaker, and fully stir it with a fully automatic mechanical stirring device to form a suspension slurry;

[0045] Step 2: Surface pretreatment of the niobium alloy substrate: cutting the niobium alloy substrate into 10×10×3mm 3 A number of block samples were pickled with 40wt.% nitric acid for 10 minutes to remove oil stains and other impurities on the surface of the substrate; roughened with 60-mesh corundum sand with a pressure of 0.3-0.5MPa. During the sandblasting process, control the corundum sand speed direction to be perpendicular to the sample surface, and the sandblasting distance is 10-20cm; after sandblasting, use absolute ethanol for ultrasonic cleaning for 20-30min, and the ul...

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Abstract

The invention relates to a micron-order supersonic speed suspension plasma spraying device and method. Pinhole type internal feeding powder feeding design is provided, a powder feeding mechanism commonly using a Laval type plasma spraying gun on engineering is transformed, sprayed powder (the grain size ranges from 500 nanometers-150 micrometers), absolute ethyl alcohol, an additive and deionizedwater are reasonably matched, and stable liquid slurry capable of achieving sufficient suspension is obtained; and a mechanical peristaltic pump is used for conveying the suspended liquid slurry to animproved pin type internal feeding opening of the supersonic speed Laval spraying gun, and after the suspension slurry and supersonic speed plasma jet flow generate sufficient heat exchange, the suspension slurry is deposited on a base plate through a supersonic spraying process to form a coating. The grain size of particles needing to be sprayed by the spraying device can reach 150 micrometers,the shape, the slurry viscosity and the fluidity of the sprayed powder are free of limitation, the deposition efficiency can reach 5-7 micrometers per pass, and the coating preparing efficiency can beimproved by nearly 7 times.

Description

technical field [0001] The invention belongs to the field of surface engineering, relates to a micron-scale supersonic suspension plasma spraying device and a spraying method, and is a new technique for suspending plasma spraying with strong universality for preparing coatings such as micron-scale ceramics and intermetallic compounds Background technique [0002] Atmospheric plasma spraying technology has important application value in the preparation of thermal barrier coatings, anti-oxidation coatings and biological coatings, but there are many restrictions on the state and properties of plasma spraying materials, such as spraying raw materials must be dry powder solid, meet A certain powder particle size, powder fluidity and bulk density are moderate, which put forward higher requirements for the preparation process of spray powder. The preparation of spray powder generally goes through a series of complicated processes such as chemical synthesis, aging, spray granulation...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/134
CPCC23C4/134
Inventor 付前刚孙佳李贺军苏杨杨周宏
Owner NORTHWESTERN POLYTECHNICAL UNIV
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