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Preparation method of thermal spraying powder for reducing oxidation and decarbonization of carbides

A technology of 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 rebound, and achieve the effect of increasing uniformity and avoiding direct decarburization

Active Publication Date: 2018-07-13
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 thermal spraying powder for reducing oxidation and decarbonization of carbides
  • Preparation method of thermal spraying powder for reducing oxidation and decarbonization of carbides
  • Preparation method of thermal spraying powder for reducing oxidation and decarbonization of carbides

Examples

Experimental program
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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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Abstract

The invention relates to a preparation method of thermal spraying powder for reducing oxidation and decarbonization of carbides. After powder is prepared through conventional processes (ball-milling,spray granulation, sintering and breaking and screening), the powder is soaked in a saturated solution of nitrate (metal ingredients in the nitrate are the same as binding phases in the alloy powder),the nitrate solution seeps into holes in the surface and the interior of the spraying powder, drying and calcining are carried out after filtering is completed, and the powder is subjected to hydrogen reduction. Reduced metal wraps fine particles, especially exposed carbide particles, in the powder. Oxidation and decarbonization of the well-wrapped carbide particles in high-temperature flame floware obviously reduced, and therefore the performance of an alloy carbide coating is remarkably improved.

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