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A kind of preparation method of granulated wc-co thermal spray powder

A technology for thermal spraying powder and granulation, which is applied in coating, melt spraying, metal processing equipment, etc., can solve the problems of powder collision tower wall easily broken, spray granulation powder broken, low spheroidization rate, etc. Coating substrate properties, the effect of increasing spheroidization, increasing compactness and density

Active Publication Date: 2021-06-08
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the centrifugal spray drying, under the action of the high-speed rotary atomizer, the centrifugal force makes the powder collide with the tower wall and is easily broken, most of which are elliptical, and the ball forming rate is low.
[0008] Chinese patent CN105648383A uses W salt and Co salt to be spray-dried-calcined and crushed by ball milling, then add carbon source, and then spray-dried-calcined-reductive carbonization to prepare WC-Co metal powder for thermal spraying, although the prepared thermal The components of the spray powder are evenly distributed, but the spray granulation powder is severely broken and has poor fluidity

Method used

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  • A kind of preparation method of granulated wc-co thermal spray powder
  • A kind of preparation method of granulated wc-co thermal spray powder
  • A kind of preparation method of granulated wc-co thermal spray powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 1) Alcohol wet grinding:

[0034] Take 200kg of carburized nano-WC-6Co composite powder with Co-coated WC grain size ≤ 200nm and Co mass content of 6%, put it into a 300L tiltable rolling ball mill, add 4.8Kg of binder paraffin, 12.5L of oleic acid, alcohol 50Kg, then add ball mill rods Φ6×20mm, Φ8×20mm, Φ12×20mm, Φ16×16mm, Φ20×10mm, a total of 1000kg, ball mill for 48 hours, and obtain ball mill slurry;

[0035] The chemical composition analysis table of the carburized nano-WC-6Co composite powder used in this example is shown in Table 1. The total carbon in the powder is high, the free carbon is low, the cobalt content is normal, and the oxygen content is low.

[0036] 2) Pressure spray granulation:

[0037] Add 10Kg alcohol wet milling 10min in step 1) gained ball mill slurry, unloading passes 325 mesh sieves, heat while stirring while unloading, to prevent paraffin from separating out;

[0038]The stirred slurry is sprayed and granulated in a fully automatic press...

Embodiment 2

[0046] 1) Alcohol wet grinding:

[0047] Take 240kg of carburized nano-WC-10Co composite powder with Co-coated WC grain size ≤ 200nm and Co mass content of 10%, and put it into a 300L tiltable rolling ball mill, add 4.8Kg of binder paraffin, 15L of oleic acid, alcohol 60Kg, then add ball mill rods Φ6×20mm, Φ8×20mm, Φ12×20mm, Φ16×16mm, Φ20×10mm, a total of 1200kg, and ball mill for 48 hours to obtain ball mill slurry;

[0048] The chemical composition analysis table of the carburized nano-WC-10Co composite powder used in this example is shown in Table 1. The total carbon in the powder is high, the free carbon is low, the cobalt content is normal, and the oxygen content is low.

[0049] The SEM topography of the ball mill slurry obtained in this embodiment after natural drying is as follows figure 1 As shown, it can be seen that the WC grain size of the ball mill slurry obtained in this example is uniform and there is no agglomeration phenomenon. round.

[0050] 2) Pressure s...

Embodiment 3

[0062] 1) Alcohol wet grinding

[0063] Take 240kg of carburized nano-WC-12Co composite powder with Co-coated WC grain size ≤ 200nm and Co mass content of 12%, put it into a 300L tiltable rolling ball mill, add 7.2Kg of binder paraffin, 15L of oleic acid, and 60Kg of alcohol , and then add ball mill rods Φ6×20mm, Φ8×20mm, Φ12×20mm, Φ16×16mm, Φ20×10mm, a total of 1200kg, and ball mill for 72 hours to obtain ball mill slurry;

[0064] The chemical composition analysis table of the carburized nano WC-12Co composite powder used in this example is shown in Table 1. The total carbon in the powder is high, the free carbon is low, the cobalt content is normal, and the oxygen content is low.

[0065] 2) Pressure spray granulation:

[0066] Add 12Kg alcohol to wet grinding for 10min in the obtained ball mill slurry in step 1), discharge the material through a 325 mesh sieve, and heat while stirring to prevent the paraffin from separating out;

[0067] The stirred slurry is sprayed and...

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Abstract

The invention discloses a preparation method of granulated WC-Co thermal spray powder, which uses carburized nano-WC-Co composite powder as raw material, undergoes alcohol wet grinding, pressure spray granulation, vacuum degreasing and sintering to obtain the target product. The granulated WC-Co thermal spray powder obtained in the present invention has high sphericity, pure phase, good fluidity, high bulk density and excellent performance.

Description

technical field [0001] The invention belongs to a method for preparing granulated WC-Co powder for thermal spraying. The granulated WC-Co thermal spray powder prepared by the method is widely used in the surface heat treatment of pulp scrapers, calender rollers, pistons, fan blades, shafts and other parts. Spray material. Background technique [0002] WC-Co coating, due to its high hardness and good toughness, is widely used in aerospace landing gear, steam iron and steel metallurgical rolls, paper industry work rolls, power industry fan blades, petrochemical ball valves and plungers, machinery Industry ball parts, etc. [0003] Hypersonic flame spraying (HVOF) technology has the advantages of high speed, low temperature, high deposition rate, high bonding strength, good material reducibility, and easy control of coating composition. corrosion performance. With the development of HVOF technology, suitable coating materials have been continuously developed, and WC-Co is cu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/04B22F9/02B22F1/00C23C4/06
CPCC23C4/06B22F9/026B22F9/04B22F2009/043B22F2998/10B22F1/142
Inventor 朱二涛张久兴杨新宇
Owner HEFEI UNIV OF TECH
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