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Preparation method of carbide oxidative decarburization thermal spray powder

A technology for thermal spraying powder and carbide, applied in metal processing equipment, transportation and packaging, etc., can solve the problems of low powder deposition rate and easy to rebound

Active Publication Date: 2021-05-11
WUXI FULAIDA PETROLEUM MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the carbide particles that are not well wrapped by the alloy phase are prone to rebound during spraying, resulting in a low powder deposition rate

Method used

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  • Preparation method of carbide oxidative decarburization thermal spray powder
  • Preparation method of carbide oxidative decarburization thermal spray powder
  • Preparation method of carbide oxidative decarburization thermal spray powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1: A kind of preparation method that reduces carbide oxidative decarburization thermal spraying powder, comprises the following steps:

[0024] (1) a mixed powder C1 composed of 10% metal Co powder and 90% WC powder by mass ratio;

[0025] (2) Mixing the mixed powder C1 with deionized water accounting for 20-25% of the total mass of the mixed powder C1 and 2% polyvinyl alcohol by ball milling to obtain a slurry C2 formed by uniformly mixing the above components;

[0026] (3) importing the slurry C2 into a centrifugal spray tower for spray drying and granulation to obtain a cermet powder C3 whose particle size is distributed within a certain range;

[0027] (4) Put the cermet powder C3 obtained by spray drying into a graphite boat or a ceramic boat, and put it into an atmosphere furnace or a vacuum furnace with a reducing atmosphere for sintering, set a moderate sintering temperature (1180° C.), and pass Broken and sieved to obtain alloy carbide powder with a...

Embodiment 2

[0032] Embodiment 2: A kind of preparation method that reduces carbide oxidative decarburization thermal spraying powder, comprises the following steps:

[0033] (1) Metal Ni powder with a mass ratio of 5% and WC powder with a mass ratio of 71% and Cr with a mass ratio of 24% 3 C 2 Raw material powder C1 composed of powder;

[0034] (2) C1 is mixed with 20-25% of the total mass of C1 deionized water and 2% polyvinyl alcohol by ball milling to obtain a slurry C2 formed by uniformly mixing and ball milling the above components;

[0035] (3) importing the slurry C2 into a centrifugal spray tower for spray drying and granulation to obtain a cermet powder C3 whose particle size is distributed within a certain range;

[0036] (4) Put the cermet powder C3 obtained by spray drying into a graphite boat or a ceramic boat, and put it into an atmosphere furnace or a vacuum furnace with a reducing atmosphere for sintering, set a moderate sintering temperature, and go through crushing and...

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PUM

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Abstract

The present invention relates to a preparation method of thermal spraying powder for reducing carbide oxidative decarburization. After the powder is prepared according to conventional techniques (ball milling, spray granulation, sintering crushing and sieving), it is immersed in a saturated solution of nitrate ( The salt contains the same metal composition as the binder phase in the alloy powder), allowing the nitrate solution to soak into the pores on the surface and inside of the sprayed powder, filtered, dried and calcined and reduced by hydrogen. Let the reduced metal coat the fine particles in the powder, especially the bare carbide particles. The oxidative decarburization of the well-wrapped carbide particles in the high-temperature flame will be significantly reduced, which will significantly improve the performance of the alloy carbide coating.

Description

technical field [0001] The invention relates to a method for preparing thermal spraying powder for reducing carbide oxidation and decarburization, and belongs to the technical field of thermal spraying. Background technique [0002] At present, most alloy carbide spray powders are prepared by mechanical ball milling, spray granulation and sintering. Since the alloy and carbide raw materials used to prepare the raw materials for the agglomeration into spherical powder are powder particles of smaller size, and the proportion of the carbide phase accounts for the majority, it is difficult for the alloy to wrap the carbide well. . Carbide particles that are not wrapped by alloy but are exposed are prone to oxidative decarburization in the high-temperature flame of thermal spraying, especially nano-carbides with a larger surface area are more prone to oxidative decarburization, so that the corresponding coating exhibits high brittleness. In addition, the carbide particles that...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/04B22F9/22B22F1/02
CPCB22F9/04B22F9/22B22F2009/043B22F1/16
Inventor 章诗岐
Owner WUXI FULAIDA PETROLEUM MACHINERY