Production method of cobalt-chromium-alloy-based spherical niobium carbide powder

A technology of cobalt-chromium alloy and production method, which is applied to metal material coating process, coating, melt spraying and other directions, can solve the problem that the density difference between cobalt-chromium alloy-based spherical niobium carbide powder, tungsten carbide and nickel-based alloy is not found. Excessive size, affecting the service life and other problems, to achieve the effect of good commercial value, good liquidity and easy operation

Inactive Publication Date: 2019-05-03
SHANGHAI MARITIME UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to tungsten carbide (16.5g / cm 3 ) and nickel-based alloy (8.9g / cm 3 ) density difference is too large, resulting in segregation between the two, resulting in cracking of the coating, affecting the service life
[0003] After searching the literature of the prior art, it is found that the publication number is CN103205749A, which discloses a nickel-based spherical tungsten carbide wear-resistant and corrosion-resistant coating and its preparation method. The disadvantage of this method is that the density difference between tungsten carbide and nickel-based alloy is too large , leading to segregation between the two, resulting in cracking of the coating and affecting the service life
[0004] By searching existing patents and literature, no report was found on the production of cobalt-chromium alloy-based spherical niobium carbide powder by plasma technology for thermal spraying

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0026] The preparation method of spherical niobium carbide comprises the following steps:

[0027] Step 1, pretreat the non-spherical niobium carbide powder to disperse the niobium carbide evenly: use a ball mill for ball milling at a speed of 50-100r / min for 12-24h;

[0028] Step 2, put the pretreated niobium carbide powder into the induction plasma spheroidization device, turn on the plasma, and set the operating parameters of the plasma: the flow rate of the argon shielding gas is 70-90 slpm (stard liter per minute, standard liter per minute Minute flow value), the flow rate of argon gas center is 20-40slpm, the flow rate of hydrogen gas is 18-22slpm, the conductivity and thermal conductivity are better under the flow rate of hydrogen gas;

[0029] Step 3, open the powder feeding valve, adjust the argon carrier gas flow rate to 3-8slpm, and adjust the powder feeding rate to 100-120g / min;

[0030] Step 4, collecting spherical niobium carbide powder.

[0031] It is measured...

Embodiment 1

[0033] (1) Weigh cobalt-chromium alloy raw materials with a particle size of 45-150 μm, with a cobalt content of 72%, a chromium content of 28%, and spherical niobium carbide raw materials with a particle size of 45-150 μm, with a niobium carbide content greater than 99%; dry for 2 hours at a temperature of 130°C .

[0034] (2) According to the weight ratio of 50% of the cobalt-chromium alloy content and 50% of the spherical niobium carbide content, the three-dimensional powder mixer is added, and the speed of the three-dimensional powder mixer is 15r / min, and the time is 90min.

[0035] The resulting powder was collected to obtain cobalt-chromium alloy-based spherical niobium carbide powder.

[0036] The obtained cobalt-chromium alloy-based spherical niobium carbide has a loose packing density of 4.97 (g / cm 3 ), the Hall flow rate is 17.7 (s / 50g).

Embodiment 2

[0038] (1) Cobalt-chromium alloy with a particle size of 45-150 μm, with a cobalt content of 76%, a chromium content of 24%, spherical niobium carbide with a particle size of 45-150 μm, and a niobium carbide content greater than 99%, and the raw cobalt-chromium alloy and spherical niobium carbide are dried separately 4h, temperature 110°C.

[0039] (2) According to the weight ratio of 65% of the cobalt-chromium alloy content and 35% of the spherical niobium carbide content, add the three-dimensional powder mixer, the three-dimensional powder mixer speed is 20r / min, and the time is 120min.

[0040] (3) Collect the obtained powder to obtain cobalt-chromium alloy-based spherical niobium carbide powder.

[0041] The obtained cobalt-chromium alloy-based spherical niobium carbide has a loose packing density of 5.16 (g / cm 3 ), the Hall flow rate is 17.1 (s / 50g).

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Abstract

The invention discloses a production method of cobalt-chromium-alloy-based spherical niobium carbide powder. The production method comprises the steps of 1, drying cobalt-chromium alloy with the grainsize ranging from 45 microns to 150 microns and spherical niobium carbide with the grain size ranging from 45 microns to 150 microns for 2-4 hours at the temperature of 110-130 DEG C, wherein the spherical niobium carbide is prepared through a plasma method, and the content of niobium carbide is greater than 99%; 2, adding, by weight percentage, 50%-80% of the cobalt-chromium alloy and 20%-50% ofthe spherical niobium carbide into a three-dimensional powder mixer, wherein the rotating speed of the three-dimensional powder mixer is 15-20 r/min, and the time is 90-120 min; and 3, collecting thecobalt-chromium-alloy-based spherical niobium carbide powder. According to the production method of the cobalt-chromium-alloy-based spherical niobium carbide powder, operation is easy and convenientto conduct, the production cost is low, and industrialization is easy to achieve; the obtained cobalt-chromium-alloy-based spherical niobium carbide powder is good in flowability and suitable for massproduction; when the cobalt-chromium-alloy-based spherical niobium carbide powder is used as a coating, the problem that cracking is caused due to segregation is not likely to be generated; and the cobalt-chromium-alloy-based spherical niobium carbide powder is resistant to high temperature, corrosion and abrasion and can be applied to a plasma transferred arc surfacing process or a thermal spraying process, and the good commercial value is achieved.

Description

technical field [0001] The invention belongs to the field of surface engineering, and relates to a production method of cobalt-chromium alloy-based spherical niobium carbide powder. Specifically, cobalt-chromium alloy powder and spherical niobium carbide powder are used as main raw materials and mixed by a three-dimensional powder mixer to produce fluidity. Good cobalt-chromium alloy-based spherical niobium carbide powder. Background technique [0002] Plasma transferred arc surfacing technology is a branch of surface coating technology and an important application of welding technology in the field of surface engineering. The plasma transferred arc surfacing process uses the transferred plasma arc as the heat source and alloy powder as the filler metal. During surfacing welding, the surface of the workpiece and the surfacing material are melted at the same time, and the two materials are mixed with each other to form a molten pool. The molten pool is condensed and crystalli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00C22C19/07C22C29/06C22C30/00C22C32/00C23C4/067
Inventor 程前陈海龑范丽董丽华尹衍生
Owner SHANGHAI MARITIME UNIVERSITY
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